19年12月16日文獻情報
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本次文獻簡報涉及生物炭對生物反應器好氧造粒的影響[1]，可見近紅外光譜評價凍土有機質[2]，生物炭修復As汙染土壤的[3]，施肥對土壤有機質增加[4]，磁性納米顆粒物與胞外聚合物複合吸附磺胺汙染水體[5]，利用模型研究生物炭吸附重金屬[6]，土壤侵蝕搬運過程中有機質的歸趨[7]，陸源有機質對冰川生態系統食物網結構影響[8]，汙泥生物炭催化過硫酸鉀降解雙酚A[9]，胞外聚合物吸附甲硝唑[10]，生物炭去除Cu(II)[11]，生物炭納米鐵複合固定磷[12]，生物炭共去除銅和四環素[13]，土壤有機質活性組分參與生物炭還原Cr(VI)[14]，微生物厭氧和好氧條件下促進生物炭降解五氯酚[15]，汞與堆肥中DOM相互作用[16]，腐殖質對磁性納米顆粒與As和Cr相互作用影響[17]，腐殖酸-Fe3+對水中有機磷光降解[18]，NOM抑制石墨納米管降解汙染物[19]，真空紫外法去除腐殖酸中酚類物質[20]，缺氧環境下有機質降解產生甲烷[21]。
1. 題目: Bioreactor performance using biochar and its effect on aerobic granulation文章編號: N19121621
期刊: Bioresource Technology
作者: Jie Ming, Qinghong Wang, Brandon A. Yoza, Jiahao Liang, Hongqiao Guo, Jin Li, Shaohui Guo, Chunmao Chen
更新時間: 2019-12-16
摘要: The effects that rice husk (biochar-rh), rice bran (biochar-rb) and walnut shell (biochar-ws) biochar had on aerobic granulation and reactor performance during the treatment of petroleum wastewater have been investigated. The different biochars reduced aerobic granulation time by 15 days compared with the control and also increased resistance to shock loading. The average COD and TN removal increased by 3.2%-5.1% and 10%-13%, respectively. Bacteria having functional metabolisms associated with the treatment of petroleum wastewaters were enriched in granular sludge that contained biochars. The reactor containing biochar-rb was the most stable and removed the most nutrients. The reactor containing biochar-rh had the largest initial granule size. This study provides insights into how the physicochemical properties of different biochars influence aerobic granular sludge systems.
文章二維碼:2. 題目: Permafrost soil complexity evaluated by laboratory imaging Vis–NIR spectroscopy文章編號: N19121620
期刊: European Journal of Soil Science
作者: W. Mueller Carsten, Steffens Markus, Buddenbaum Henning
更新時間: 2019-12-16
摘要: The biogeochemical functioning of soils (e.g. soil carbon stabilization, nutrient cycling) is determined at the interfaces of specific soil structures (e.g. aggregates, particulate organic matter (POM), organo‐mineral associations). With a growing accessibility of spectromicroscopic techniques there is an increase in nano‐ to microscale analyses of biogeochemical interfaces at the process scale, reaching from the distribution of elements and isotopes to the localization of microorganisms. A widely used approach to study intact soil structures is the fixation and embedding of intact soil samples in resin and the subsequent analyses of soil cross sections using spectromicroscopic techniques. However, it is still challenging to link such microscale approaches to larger scales at which normally bulk soil analyses are conducted. Here we report on the use of laboratory imaging Vis–NIR spectroscopy on resin embedded soil sections and a procedure for supervised image classification to determine the microscale soil structure arrangement including the quantification of soil organic matter fractions. This approach will help to upscale from microscale spectromicroscopic techniques to the cm and possibly pedon scale. Thus, we demonstrate a new approach to integrate microscale soil analyses into pedon scale conceptual and experimental approaches.
文章二維碼:3. 題目: Passivating Effect of Dewatered Sludge and Biochar on As-Contaminated Soil文章編號: N19121619
期刊: Water, Air, & Soil Pollution
作者: Ninglin Luo, Jiajun Wen, Zhongwu Li, Mei Huang, Ren Yang
更新時間: 2019-12-16
摘要: The pollution caused by As in soil menaces the health of humans. There are characteristics of waste utilization, low cost, and a wide range of materials by using dewatered sludge as the main component of soil repair agents. In this paper, dewatered sludge and biochar were used as repair agents for As pollution, which were rarely reported, and the related passivation experiments were carried out. Through the analysis of experimental data of the basic physical and chemical properties of contaminated soil, various characteristics of repair agent and As morphology were obtained, and the applicability and passivation effect of dewatered sludge-biochar compound repair agent and dewatered sludge as an individual repair agent on passivation of As pollution in soil was discussed. By comparing different passivation effects, the repairing effect increases with time, and the optimal repair time was 40 days; in the set experiment group, the best passivation effect of the individual repair agent was the S3 (dry sludge accounting for 20% of soil samples) experimental group, and the best effect of the compound repair agent was the S + B3 (dry sludge and biochar accounting for 10% and 2% of soil samples, respectively) group. As a repair agent, the dewatered sludge-biochar compound repair agent can be used to repair As-contaminated soil, which provides a new method for the recycling and waste utilization of dewatered sludge.
文章二維碼:4. 題目: Partial substitution of chemical fertilizers with organic amendments increased rice yield by changing phosphorus fractions and improving phosphatase activities in fluvo-aquic soil文章編號: N19121618
期刊: Journal of Soils and Sediments
作者: Muhammad Qaswar, Rushan Chai, Waqas Ahmed, Huang Jing, Tianfu Han, Kailou Liu, Xinxin Ye, Yongmei Xu, Christian Kofi Anthonio, Huimin Zhang
更新時間: 2019-12-16
摘要: Purpose: The aim of this study was to investigate the effect of combined use of chemical fertilizers with wheat straw and swine manure on rice yield and phosphorus (P) fractions distribution. Materials and methods: We selected two field experiments, both located in Hefei, Anhui province of China. We named these experimental sites as HF-1 and HF-2. The experiments HF-1 and HF-2 were initiated on 2013 and 2015 respectively in fluvo-aquic soil. Treatments included CK (no fertilizer), NPK (chemical fertilizers), NPKS (chemical fertilizers plus wheat straw), and NPKM (chemical fertilizers plus swine manure at HF-1, and chemical fertilizers plus fermented wheat straw at HF-2). Results and discussion: Results showed that NPKS and NPKM treatments increased grain yield, P use efficiency (PUE), P recovery efficiency, and partial factor productivity, and decreased apparent P balance compared with CK and NPK at both sites. NPKS and NPKM improved pH, organic matter, and nutrient contents in surface soil (0–20 cm) and also improved pH and organic matter content in sub-surface soil (20–40 cm), compared with CK and NPK treatments. Olsen P content in both soil depths was highest under NPKM, but NPKS had lower Olsen P content in sub-surface soil compared with that of NPK. Organic amendments changed P fractions and increased labile P and moderately labile P fractions, and decreased residual P compared with NPK. Organic amendments with chemical fertilizers also improved acid phosphomonoesterase and phosphodiesterase activities compared with chemical fertilization. In addition, path analysis showed relationship between soil properties and P mobility, and also explained soil properties influencing grain yield by changing PUE. Conclusions: Our results suggested that organic amendments improve crop yield through improving PUE by changing soil P fractions and increasing the phosphatase activities.
文章二維碼:5. 題目: Enhanced adsorption performance and regeneration of magnetic Fe 3 O 4 nanoparticles assisted extracellular polymeric substances in sulfonamide-contaminated water文章編號: N19121617
期刊: Environmental Science and Pollution Research
作者: Shanshan Pi, Ang Li, Di Cui, Zhou Su, Lu Zhou, Fang Ma
更新時間: 2019-12-16
摘要: It is still unclear about the superiority of the nanoscale Fe3O4-assisted extracellular polymeric substances (EPS) compared to traditional EPS and its application feasibility in sulfonamide-contaminated aqueous system. This study reported eco-friendly and reusable EPS/Fe3O4 was applied in the sulfonamide-contaminated water treatment, including sulfamethoxazole (SMX), sulfamerazine (SM1), sulfamethazine (SM2) and sulfadiazine (SDZ), respectively. EPS/Fe3O4 exhibited the adsorption performance of 77.93%, 74.13%, 65.62%, and 56.64% for SMX, SM1, SM2 and SDZ, respectively, increased by 7.93%, 19.02%, 13.78% and 9.93% compared to traditional EPS. The initial pH value tuned adsorption performance via varying existing species of each sulfonamides. The adsorption process could be well fitted by Freundlich and pseudo-second-order kinetics models. Moreover, the multiple evidences from SEM, FTIR, zeta potential and XRD explained the adsorption mechanisms (i.e., chemisorption, ion exchange, hydroxyl group and hydrophobicity). Desorption and recycle adsorption experiments demonstrated the well regeneration ability of EPS/Fe3O4 as biosorbent (67.12% adsorption performance for SMX after five adsorption–desorption cycles), suggesting EPS/Fe3O4 was considered as a superior choice for sulfonamide-contaminated water treatment compared to the unrecyclable EPS.
文章二維碼:6. 題目: Comparison of CU(II), MN(II) and ZN(II) adsorption on biochar using diagnostic and simulation models文章編號: N19121616
期刊: Chemosphere
作者: Edita Baltrėnaitė-Gedienė, Teresė Leonavičienė, Pranas Baltrėnas
更新時間: 2019-12-16
圖文摘要:
摘要: With the increase of urbanization and human consumption, the extraction of potentially toxic elements (PTEs) causes higher risk of them to enter sources of human food and potable water. Adsorption has been studied extensively as phenomena to reduce element mobility in both natural and engineered systems. The need to adapt the adsorption models to simulate the adsorption increases as the variety of adsorbents of natural origin is getting bigger and bigger due to their sustainability, availability and low costs. Adsorption of PTEs was analysed in the case of biochar which is a widely studied adsorbent, however, the studies are often limited to standard adsorption equilibrium and kinetic procedures without further analyses into the adsorbate and adsorbent contact zone. Zn(II), Cu(II) and Mn(II) were chosen study due to their nutritional and toxicological features. Diagnostic methods were used to differentiate the metal behaviour during adsorption and dynamic intraparticle model was further employed to simulate the kinetic conditions. Harkins-Jura isotherm model and pseudo-second kinetic model were determined to fit the adsorption of PTEs on biochar. According to the adsorption efficiency and capacity, PTEs fell into the following sequence: Cu(II) > Mn(II)>Zn(II). It was observed that the kinetics of Cu(II) decreased in the solution by about 1.7 times more than of Zn(II) and about 2.3 times more than of Mn(II). Cu(II) decreased faster and more suddenly than Mn(II) and Zn(II) in the solution on the particle surface and in the solution inside the particle.
文章二維碼:7. 題目: The stability and fate of Soil Organic Carbon during the transport phase of soil erosion文章編號: N19121615
期刊: Earth-Science Reviews
作者: Evy A. de Nijs, Erik L.H. Cammeraat
更新時間: 2019-12-16
摘要: Soil organic carbon (SOC) is the largest pool of non-sedimentary terrestrial carbon (C) and small changes in vertical SOC fluxes in the erosion-transport-deposition system could have a significant effect on atmospheric C levels. The ongoing sink/source discussion related to SOC seems to depend on which mechanisms are dominant during each of the three stages of soil erosion: detachment, transportation and deposition. Understanding C dynamics during each phase of soil erosion is essential to accurately assess the net effect of erosion. Currently, there is a knowledge gap when it comes to the movement of mobilized SOC from the site of detachment to the depositional site. This review provides an overview on the current understanding of the fate of eroded SOC during the transport phase of soil erosion. The stability of SOC appears to be a logistic interplay between SOC accessibility, presence of decomposers and suitable abiotic conditions. The main protection mechanisms of SOC are physical and/or chemical protection, which both make SOC inaccessible to decomposers and hence prevent mineralization. Transport subjects the SOC to disturbances and changing environmental conditions which interfere with the effectiveness of the protection mechanisms. The vulnerability of these mechanisms to erosive transport are not yet known. Increased physical impact is associated with disaggregation which releases previously protected SOC. Changes in geochemical composition of soil potentially changes the extent of organo-mineral bindings and hence either strengthen or weaken chemical protection. Complex chemical structures might result in more resistant C called biochemical stable SOC and is vulnerable to destabilization during transport due to changes in (a)biotic conditions along the trajectory. A complete understanding of the fate of mobilized SOC during transportation is essential to assess the net effect of soil erosion under different conditions. Standardization of both methodology and terminology in the field of soil erosion will further contribute to resolving the controversy on the net effect of erosion. The focus for future research should be on documenting the different interacting processes active during erosive transport and their effect on SOC fluxes.
文章二維碼:8. 題目: Benthic trophic structure of a Patagonian fjord (47°S): The role of hydrographic conditions in the food supply in a glaciofluvial system文章編號: N19121614
期刊: Estuarine, Coastal and Shelf Science
作者: Ilia Cari, Claudia Andrade, Eduardo Quiroga, Erika Mutschke
更新時間: 2019-12-16
摘要: Food web studies have provided insight into the dynamics of benthic ecosystems and their stability, stimulating research into the importance of different organic matters (OM) inputs in the ecological and metabolic processes that affect community structure. Using stable isotope analysis (SIA) and Bayesian ellipses, this study examines the influence of terrestrial OM and hydrographic conditions on food web structure and niche width in a glacial system (Baker/Martínez fjord complex). Two ecological groups were identified; one located in the inner and middle fjord and the other one in the outer fjord. Both had isotopically less diverse feeding groups in comparison to non-glacier benthic communities, comprising four trophic levels. In addition, the study area exhibited high trophic redundancy (e.g., species with overlapping trophic niches) associated with chronic natural physical disturbances from glacial sedimentations, which have shaped this non-selective feeding benthic community. The trophic structure metrics suggest that the benthic food web is supported principally by primary production and terrestrial OM pathways, but macroalgal subsidies could be important to detritivores via floating kelp in the inner area of the fjord. The results of this study suggest that glaciofluvial benthic communities have higher trophic redundancy associated with environmental disturbance conducted by sediment load, shaping a benthic community with a lower alpha diversity and fewer trophic levels in comparison to no-glacier environments.
文章二維碼:9. 題目: Synergistic oxidation of Bisphenol A in a heterogeneous ultrasound-enhanced sludge biochar catalyst/persulfate process: Reactivity and mechanism文章編號: N19121613
期刊: Journal of Hazardous Materials
作者: Zeng-Hui Diao, Fu-Xin Dong, Liu Yan, Zhi-Liang Chen, Wei Qian, Ling-Jun Kong, Zai-Wang Zhang, Tao Zhang, Xue-Qin Tao, Jian-Jun Du, Dan Jiang, Wei Chu
更新時間: 2019-12-16
圖文摘要:
摘要: Recently, clean-up of resistant organic compounds has attracted growing attention. In this study, a novel heterogeneous ultrasound-enhanced sludge biochar catalyst/persulfate (BC/PS/US) process was firstly developed for the degradation of bisphenol A (BPA) in water. The results revealed that BC/PS/US process could successfully achieve a positively synergistic effect between sonochemistry and catalytic chemistry on the degradation of BPA compared to its corresponding comparative process. Nearly 98% of BPA could be degraded within 80 min at optimum reaction conditions. The coexisting substances including Cl−, SO42- and NO3− had no obvious inhibition on the BPA degradation, whereas HCO3− and humic acid (HA) had significant inhibition effects on that. PS decomposition of BC/PS/US process was superior to that of BC/PS or US/PS process. Both SO4― and HO participated in the degradation of BPA, but SO4― was predominant radical in the BC/PS/US process. A possible pathway of BPA degradation was proposed, and the BPA molecule was attacked by SO4― and degraded into five kinds of intermediate products through hydroxylation and demethylation processes. This study helps to comprehend the application of sludge biochar catalyst as a persulfate activator for the degradation of organic compounds under ultrasound irradiation, and provides a new strategy in wastewater treatment.
文章二維碼:10. 題目: Removal of metronidazole from aqueous media by C. vulgaris文章編號: N19121612
期刊: Journal of Hazardous Materials
作者: Sufia Hena, Leo Gutierrez, Jean-Philippe Croué
更新時間: 2019-12-16
圖文摘要:
摘要: This current study investigated the removal of metronidazole from aqueous media by C. vulgaris. Two different initial sizes of inoculum (0.05 and 0.5 g L−1) were tested for a wide concentration range of metronidazole (1–50 μM). The effect of metronidazole concentrations on biomass production was studied for 20 days. The exopolymeric substances (EPS) were quantified and correlated with the removal of antibiotics from aqueous media. Specifically, MDZ stimulated the production of EPS in C. vulgaris, which played the major role in the adsorption of this antibiotic. Also, metronidazole significantly influenced the zeta potential of C. vulgaris in the test cultures, indicating a change in surface characteristics. This decrease in surface negative charge caused auto-flocculation phenomena at a stationary phase. Chronic and acute toxicity experiments showed that metronidazole was harmful to C. vulgaris at stationary phase. Results from this study would advance our knowledge on the treatment of metronidazole-contaminated waters with C. vulgaris as a green technology-oriented process.
文章二維碼:11. 題目: Novel pectin based composite hydrogel derived from grapefruit peel for enhanced Cu(II) removal文章編號: N19121611
期刊: Journal of Hazardous Materials
作者: Wei Zhang, Jianyang Song, Qiulai He, Hongyu Wang, Wanlin Lyu, Huijuan Feng, Wenqi Xiong, Wenbin Guo, Jing Wu, Ling Chen
更新時間: 2019-12-16
圖文摘要:
摘要: Novel biochar/pectin/alginate hydrogel beads (BPA) derived from grapefruit peel were synthesized and used for Cu(II) removal from aqueous solution. FTIR, SEM-EDS, XRD, TGA and XPS, etc. were applied for characterization analysis. The synergistic reinforcing effect of polymer matrix and biochar fillers improved the adsorptive, mechanical and thermostabilized performance of BPA. Factors like component contents of biochar and pectin, pH, contact time, Cu(II) concentration and coexisting inorganic salts or organic ligands were systematically investigated in batch mode. The adsorption isotherms were fitted well by the Freundlich model and the experimental maximum adsorption capacity of optimized BPA-9 beads (mass ratio of pectin to alginate = 10:1) with 0.25% biochar, was ∼80.6 mg/g at pH 6. Kinetic process was well described by the pseudo-second-order model and film diffusion primarily governed the overall adsorption rate, followed by intraparticle diffusion. Thermodynamics analysis suggested spontaneous feasibility and endothermic nature of adsorption behavior. Moreover, BPA also showed better environmental adaptability in the presence of NaCl, MgCl2, CaCl2, EDTA-2Na and CA as well as good adsorption potential for other heavy metal [e.g. Pb(III)]. Crucially, the BPA beads showed good regeneration ability after five cycles. All these results indicated the potential of BPA for removing heavy metal from water.
文章二維碼:12. 題目: Enhanced passivation of lead with immobilized phosphate solubilizing bacteria beads loaded with biochar/ nanoscale zero valent iron composite文章編號: N19121610
期刊: Journal of Hazardous Materials
作者: Zedong Teng, Wen Shao, Keyao Zhang, Fulu Yu, Yaoqiang Huo, Min Li
更新時間: 2019-12-16
圖文摘要:
摘要: Phosphate solubilizing bacteria (PSBs) can effectively enhance the stability of lead via the formation of insoluble Pb-phosphate compounds. This research presents a bio-beads, which was implemented with the help of a self-designed porous spheres carrier, by immobilized PSBs strains Leclercia adecarboxylata (hereafter referred as L1-5). In addition, the passivation efficiency of lead via bio-beads under different conditions and its mechanism were also investigated in this study. The results indicated that phosphate solubilized by bio-beads could reach 30 mg/L in Ca3(PO4)2 medium containing 1 mM Pb2+, and the highest removal rate of Pb2+ in beef peptone liquid medium could reach 93%, which is better than that of free bacteria. Furthermore, it was also concluded that the lead could be transformed into stable crystal texture, such as Pb5(PO4)3Cl and Pb5(PO4)3OH. Both hydrophobic and hydrophilic groups in the bio-beads could capture Pb2+, which indicated that electrostatic attraction and ion-exchange were also the mechanism of Pb2+ adsorption. All the experimental findings demonstrated that this bio-bead could be consider as an efficient way for the lead immobilization in contaminated soil in the future.
文章二維碼:13. 題目: Synergistic removal of copper and tetracycline from aqueous solution by steam-activated bamboo-derived biochar文章編號: N19121609
期刊: Journal of Hazardous Materials
作者: Rong-Zhong Wang, Dan-Lian Huang, Yun-Guo Liu, Chen Zhang, Cui Lai, Xin Wang, Guang-Ming Zeng, Qing Zhang, Xiao-Min Gong, Piao Xu
更新時間: 2019-12-16
圖文摘要:
摘要: Steam-activated biochar (SBC) was prepared and showed excellent performance for synergistic removal of Cu2+ and tetracycline (TC). The adsorption capacity of SBC and mutual effect of TC and Cu2+ were investigated via single and binary system and the adsorption isotherm. The adsorption capacity of TC was significantly enhanced when it coexisted with Cu2+. Likewise, increased amounts of Cu2+ were adsorbed in the presence of TC. The presence of NaCl exerted a negative influence on the adsorption of Cu2+, while the inhibitory effect of salinity on TC was neutralized by bridge enhancement in the binary system. Bridge enhancement and site competition were involved in the synergistic removal of TC and Cu2+. Considering the stable application in simulated and real water samples, SBC showed great potential for synergistic removal of antibiotics and heavy metals.
文章二維碼:14. 題目: Participation of soil active components in the reduction of Cr(VI) by biochar: Differing effects of iron mineral alone and its combination with organic acid文章編號: N19121608
期刊: Journal of Hazardous Materials
作者: Zibo Xu, Xiaoyun Xu, Daniel C.W. Tsang, Fan Yang, Ling Zhao, Hao Qiu, Xinde Cao
更新時間: 2019-12-16
圖文摘要:
摘要: Biochar as a soil amendment could be involved in redox process of elements which would be affected by soil-redox-active components including minerals and organic acids. This study evaluated the effects of Fe mineral and lactate on reducing capacity of biochar for Cr(VI) reduction and the underlying mechanisms. Fe minerals inhibited the reduction of Cr(VI) by biochar, with the decrease of Cr(VI) reduction rate constant obtained by pseudo first-order reaction model from 2.18 to 2.47 × 10−2 h-1 to 0.71–1.51 × 10−2 h-1. The decrease of reduction rate constant was because (1) the loss of electron donating moieties in biochar; and (2) inhibition of electron transfer between biochar and Cr(VI) due to surface coverage by biochar-Fe complex. However, the coexistence of Fe minerals with lactate enhanced the reduction of Cr(VI) by biochar, with the rate constant increasing from 2.58 to 3.05 × 10−2 h-1 to 2.91–27.2 × 10−2 h-1. The positive effect was also attributed to two reasons: (1) lactate can decrease the surface Fe-coverage of biochar through chelating process; (2) electron from lactate can be shuttled by Fe(II) and thus enhancing the Cr(VI) reduction. Our results revealed that different soil redox-active components could have varying effects on biochar amendment for Cr(VI) reduction, which should be further considered during the application of biochar.
文章二維碼:15. 題目: Dynamic processes in conjunction with microbial response to disclose the biochar effect on pentachlorophenol degradation under both aerobic and anaerobic conditions文章編號: N19121607
期刊: Journal of Hazardous Materials
作者: Yan Xu, Jiaqi Liu, Wenshan Cai, Jiayin Feng, Zhijiang Lu, Haizhen Wang, Ashley E. Franks, Caixian Tang, Yan He, Jianming Xu
更新時間: 2019-12-16
圖文摘要:
摘要: Organochlorines are critical soil contaminants and the use of biochar has recently shown potential to improve soil remediation. However, little is known about biochar-microbe interactions nor the impact on environmental processes such as the immobilization and biodegradation of organochlorine compounds. In this study, we performed microcosm experiments to elucidate how biochar affected the biodegradation and sequestration of pentachlorophenol (PCP). Our results showed that the amendment of biochar markedly inhibited PCP biodegradation due to a strong sorption affinity for PCP under both aerobic and anaerobic conditions. Notably, the inhibitory effect was relatively weaker under anaerobic conditions than under aerobic conditions. The addition of biochar can dramatically shift the bacterial community diversity in the PCP-spiked soils. Under aerobic conditions, biochar significantly stimulated the growth of PCP-degrading bacteria Bacillus and Sphingomonas, but reduced the opportunities for microbes to contact with PCP directly. Under anaerobic conditions, the non-strict organohalide-respiring bacteria Desulfovibrio, Anaeromyxobacter, Geobacter and Desulfomonile were the main drivers of PCP transformation. Our results imply that the use of biochar as a soil remediation strategy for organochlorine compounds should be cautious.
文章二維碼:16. 題目: Parallel faction analysis combined with two-dimensional correlation spectroscopy reveal the characteristics of mercury-composting-derived dissolved organic matter interactions文章編號: N19121606
期刊: Journal of Hazardous Materials
作者: Hong-Yang Cui, Shu-Bo Zhang, Mao-Yuan Zhao, Yue Zhao, Zi-Min Wei
更新時間: 2019-12-16
圖文摘要:
摘要: Dissolved organic matter (DOM) is regarded as the environmentally friendly substance. Strong complexes could be formed between DOM and heavy metals. Thus, the distribution, bioavailability, toxicity, and fate of heavy metals could be controlled in the environment. The widely spread method for characterizing metal-organic interactions is restricted to combine parallel faction analysis (PARAFAC) with the complexation model. However, a DOM PARAFAC component always contains two or more peaks. Therefore, the traditional method cannot reveal the inner changes of PARAFAC components or whether all the DOM peaks in one PARAFAC component are bound with metal during the metal-organic binding process. In this work, two-dimensional correlation spectroscopy (2DCOS) combined with PARAFAC and the complexation model were employed to reveal the binding speed and ability of different fluorescent peaks from DOM PARAFAC components during the binding process of mercury (Hg2+) to DOM. The results in this study showed that during the Hg2+-DOM binding process, fluorescent peaks in tryptophan-like component all presented Hg2+-binding ability. However, only humic-like component ligands showed Hg2+-binding ability. With these promising results, the true Hg2+ binding rate and ability of different DOM ligands can be revealed, which is helpful for addressing environmental pollution.
文章二維碼:17. 題目: Effect of Fe-metabolizing bacteria and humic substances on magnetite nanoparticle reactivity towards arsenic and chromium文章編號: N19121605
期刊: Journal of Hazardous Materials
作者: Anneli Sundman, Anna-Lena Vitzthum, Konstantin Adaktylos-Surber, Adriana I. Figueroa, Gerrit van der Laan, Birgit Daus, Andreas Kappler, James M. Byrne
更新時間: 2019-12-16
圖文摘要:
摘要: Magnetite is a magnetic, Fe(II)-Fe(III)-mineral formed through abiogenic and biogenic pathways. It constitutes an attractive material for remediation due to its reactivity, large surface-area-to-volume ratio when present as nanoparticles, and magnetic recoverability. Magnetite can be repeatedly microbially oxidized or reduced, but it is unclear how this influences the reactivity of magnetite towards toxic metal or metalloid contaminants. In this study, magnetite (both abiogenic and biogenic) was exposed to microbial Fe(II) oxidation and Fe(III) reduction, before reacted with hexavalent chromium (Cr(VI)) or pentavalent arsenic (As(V)). Results showed microbial reduction of both magnetite types improved the removal rate of Cr(VI) from solution, though surprisingly microbial Fe(II)-oxidation also showed enhanced reactivity towards Cr(VI) compared to un-treated magnetite. Synchrotron based analysis confirmed the formation of Cr(III) at the surface of the magnetite. Reactivity with As was less dramatic and showed un-treated material was able to remove As(V) from solution faster than microbially Fe(III)-reduced and Fe(II)-oxidized magnetite. The presence of humic substances was also shown to lead to a decreased reactivity of biogenic and abiogenic magnetite towards As(V) and Cr(VI). Our results imply that Fe-metabolizing bacteria influence the immobilization of contaminants and should be considered when evaluating remediation schemes, especially where Fe-metabolizing bacteria are active.
文章二維碼:18. 題目: The mechanism of aquatic photodegradation of organophosphorus sensitized by humic acid-Fe3+ complexes文章編號: N19121604
期刊: Journal of Hazardous Materials
作者: Jing Liu, Jiajun Fan, Tianyu He, Xiaofang Xu, Yulu Ai, Haoran Tang, Hao Gu, Tao Lu, Yanhui Liu, Guo Liu
更新時間: 2019-12-16
圖文摘要:
摘要: Organic phosphorus is an important source of eutrophication. In this study, to understand the mechanism of organophosphorus photodegradation, humic acid-Fe3+ (HA-Fe3+) complexes were prepared as a sensitizer, and glyphosate (GP) was used as a substrate for photodegradation. The effects of the initial GP concentration, HA concentration, Fe3+ concentration and microbial factors on photodegradation were investigated. The initial concentrations of GP, HA and Fe3+ could significantly affect the degradation rate of GP. Phosphate is the main product of GP photodegradation. Based on the identification of the active species in the reaction process, t-butanol was found to have the most significant inhibitory effect on the degradation. The reaction rate after t-butanol treatment was reduced from 0.017 to 0.003. This confirmed that OH was the main oxidant in the system, which was also demonstrated by EPR spectroscopy. A possible mechanism of GP photodegradation sensitized by HA-Fe3+ complexes was revealed for the first time. The HA-Fe3+ complexes in the reaction system were photodegraded and oxidized to finally produce OH, which promotes GP photodegradation. This study facilitates understanding the phosphorus cycle in a water environment and provides a scientific basis for the restoration of eutrophic lakes.
文章二維碼:19. 題目: The duet of surface and radical-based carbocatalysis for oxidative destructions of aqueous contaminants over built-in nanotubes of graphite文章編號: N19121603
期刊: Journal of Hazardous Materials
作者: Yuxian Wang, Jiaxin Xi, Xiaoguang Duan, Weiguang Lv, Hongbin Cao, Chunmao Chen, Zhuang Guo, Yongbing Xie, Shaobin Wang
更新時間: 2019-12-16
圖文摘要:
摘要: Metal-free mesoporous graphitic frameworks with built-in nanotubes (CPGs) were synthesized via facile co-pyrolysis of cyclodextrin and a cobalt salt with subsequent acid pickling to remove the embedded metal species. Due to the high graphitic degree and built-in few-layer nanotubes, the as-synthesized carbonaceous materials possess a higher catalytic ozonation activity than that of the state-of-the-art carbon nanotubes (CNTs) and LaMnO3 perovskite catalysts for the destruction of different aqueous contaminants. For recalcitrant oxalic acid removal, 50 mg L−1 oxalic acid was completely degraded in 20 min. Compared with other nanocarbons, the as-synthesized materials also demonstrated robust structural stability and reusability. The electron paramagnetic resonance (EPR) and selective radical quenching tests revealed that the destruction of the aqueous organics predominantly relied on surface-adsorbed complexes (O*ad and O2*) from activated ozone molecules. Owing to the occurrence of this surface oxidation pathway, the compatibility of the CPGs/O3 system was significantly enhanced for treatment of real wastewater, where the inorganic anions and organic natural organic matter would inhibit radical oxidation as radical scavengers. Furthermore, by employing organics with different ionization potentials (IPs) as the target pollutants, the CPGs/O3 system was discovered to obtain a high oxidation potential.
文章二維碼:20. 題目: Application of vacuum-ultraviolet (VUV) for phenolic homologues removal in humic acid solution: Efficiency, pathway and DFT calculation文章編號: N19121602
期刊: Journal of Hazardous Materials
作者: Ting-ting Cao, Xu Tie-fu, Mu-nan Zhao, Jiang Xu, Chong-wei Cui
更新時間: 2019-12-16
圖文摘要:
摘要: Vacuum-ultraviolet (VUV) photo-initiated oxidation of phenolic homologues in simulative natural water were investigated, including phenol, o-dihydroxybenzene (ODB), m-dihydroxybenzene (MDB), p-dihydroxybenzene (PDB), paranitrophenol (PNP) and o-chlorophenol (OCP). Results showed the phenolic homologues removal rate reached at least 90% in pure water, which was dependent on temperature, pH, concentration of HA, and functional group of HA. Experimental results indicated that 0.2 mg/L HA might be a critical point. Additionally, the rate constant of the six phenolic homologues reduced by 76.85%, 77.81%, 71.91%, 79.15%, and 55.69%, respectively in the MDB solution, and 79.73%, 82.80%, 95.36%, 80.38%, and 92.64%, respectively in the benzoic acid (BA) solution, compared to the rate constant in pure water. Moreover, quantum chemistry calculation indicated that the variances between phenolic compounds in removal rate were attributed to the substituent on the benzene ring. And, to some extent, the carboxy group of HA was supposed to arose the suppression for phenolic homologues removal rate. Mechanism involved phenolic homologues degradation using vacuum-ultraviolet (VUV) was summarized, where it underwent the formation of quinone structures, ring opening, short-chain organic acid, even eventually the transformation into NO3− and Cl− of PNP and OCP.
文章二維碼:21. 題目: Importance of hydrogenotrophic, aceticlastic and methylotrophic methanogenesis for methane production in terrestrial, aquatic and other anoxic environments: A mini review文章編號: N19121601
期刊: Pedosphere
作者: Ralf CONRAD
更新時間: 2019-12-16
摘要: Microbial methanogenesis is a major source of the greenhouse gas methane (CH4). It is the final step in the anaerobic degradation of organic matter when inorganic electron acceptors such as nitrate, ferric iron, or sulfate have been depleted. Knowledge of this degradation pathway is important for the creation of mechanistic models, prediction of future CH4 emission scenarios, and development of mitigation strategies. In most anoxic environments, CH4 is produced from either acetate (aceticlastic methanogenesis) or hydrogen (H2) plus carbon dioxide (CO2) (hydrogenotrophic methanogenesis). Hydrogen can be replaced by other CO2-type methanogenesis, using formate, carbon monoxide (CO), or alcohols as substrates. The ratio of these two pathways is tightly constrained by the stoichiometry of conversion processes. If the degradation of organic matter is complete (e.g., degradation of straw in rice paddies), then fermentation eventually results in production of acetate and H2 at a ratio of > 67% aceticlastic and < 33% hydrogenotrophic methanogensis. However, acetate production can be favored when heterotrophic or chemolithotrophic acetogenesis is enhanced, and H2 production can be favored when syntrophic acetate oxidation is enhanced. This typically occurs at low and elevated temperatures, respectively. Thus, temperature can strongly influence the methanogenic pathway, which may range from 100% aceticlastic methanogenesis at low temperatures to 100% hydrogenotrophic methanogenesis at high temperatures. However, if the degradation of organic matter is not complete (e.g., degradation of soil organic matter), the stoichiometry of fermentation is not tightly constrained, resulting, for example, in the preferential production of H2, followed by hydrogenotrophic methanogenesis. Preferential production of CH4 by either aceticlastic or hydrogenotrophic methanogenesis can also happen if one of the methanogenic substrates is not consumed by methanogens but is, instead, accumulated, volatilized, or utilized otherwise. Methylotrophic methanogens, which can use methanol as a substrate, are widespread, but it is unlikely that methanol is produced in similar quantities as acetate, CO2, and H2. Methylotrophic methanogenesis is important in saline environments, where compatible solutes are degraded to methyl compounds (trimethyl amine and dimethyl sulfide) and then serve as non-competitive substrates, while acetate and hydrogen are degraded by non-methanogenic processes, e.g., sulfate reduction.
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