JOURNAL OF HAZARDOUS MATERIALS
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2016
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IF 4.836
Shengcun Ma,Yiqun Gan,Baiyang Chen,Zhong Tang,Stuart Krasner
This study systematically evaluates the capabilities of five types of household water treatment (HWT) methods (including boiler heating, microwave irradiation, pouring, stirring, and shaking) on the removals of four regulated trihalomethanes (THM 4 ) and three iodinated halomethanes (IHMs) under a variety of conditions simulative of residential uses. Overall, the results clearly showed promising capabilities of all five HWT methods in controlling volatile disinfection by-products (DBPs), and heating with a boiler was the most effective approach among all methods due to the synergistic effects of water turbulence and bubbling phenomena. A contemporary boiler equipped with an automatic switch-off function reduced on average 92% of seven halomethanes (HM 7 ) at favourable conditions. The removal increased significantly with increasing initial concentrations and the rates correlated well with the logarithmic Henry’s law constants and molecular weights of compounds, with triiodomethane being the most refractory species. Meanwhile, the importance of water handling habits was revealed, including power input, operation time, volume, heating/cooling speed, cooling method, and capping conditions. The findings hence explored the potentials of HWTs on DBP control and pointed out a potential limit to DBP epidemiology studies that do not consider water handling habits.
研究领域:
环境科学
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公共卫生
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产品关联
DOI
PubMed
高影响因子
Nature Geoscience
·
2025
·Vol. 18
·期 9
·877-884
·
IF 16.1
Liu Tuo,Li Lingyan,Xue Kai,Wang Xuemeng,Li Huiju,Wang Yanfen,Dong Xiuzhu
Lignin is a natural plant polymer that accounts for about one-third of the organic carbon in the biosphere. Global warming has led to shrub encroachment and increased lignin input into peatlands. Generally, lignin is recalcitrant to microbial degradation in anoxic environments. Here we report methane production from lignin and its constituent monophenols in a flooded peatland in China based on microcosm experiments. Methane production was higher in the moderate shrub-covered peatland soils that have greater lignin contents compared with those of herb-covered soils. Adding lower contents of lignin and its monophenols promoted methane production of herb soil microcosms, and lignin contributed approximately 1.2–14.2% of the total methane emissions. Isotope tracing and dynamic metabolomic analyses revealed that the methoxy group of vanillin was first converted to methane, and then the aromatic ring carbons were fermented into CO 2 , acetate, propionate and (iso)butyrate. Lignin and its monophenols enriched the methylotrophic methanogens Methanomassiliicoccus and Methanosarcina , suggesting their involvement in methoxydotrophic methanogenesis. We suggest that lignin should not be overlooked as a source of methane in peatlands, especially given increasing shrub encroachment under global warming.
研究领域:
生物地球化学
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微生物生态学
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环境微生物学
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气候变化
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土壤科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
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IF 9.8
Hong-Yu Jin,Lei Yang,Yong-Xiang Ren,Cong-Cong Tang,Ai-Juan Zhou,Wenzong Liu,Zhihua Li,Aijie Wang,Zhang-Wei He
Methane is one of the most promising renewable energies to alleviate energy crisis or replace fossil fuels, which can be recovered from anaerobic digestion of bio-wastes. However, the engineering application of anaerobic digestion is always hindered by low methane yield and production rate. This study revealed the roles and mechanisms of a green-prepared magnetic biochar (MBC) in promoting methane production performance from waste activated sludge. Results showed that the methane yield reached 208.7 mL/g volatile suspended solids with MBC additive dosage of 1 g/L, increasing by 22.1 % compared to that in control. Mechanism analysis demonstrated that MBC could promote hydrolysis, acidification, and methanogenesis stages. This was because the properties of biochar were upgraded by loading nano-magnetite, such as specific surface area, surface active sites, and surface functional groups, which made MBC have greater potential to mediate electron transfer. Correspondingly, the activity of α-glucosidase and protease respectively increased by 41.7 % and 50.0 %, and then the hydrolysis performances of polysaccharides and proteins were improved. Also, MBC improved the secretion of electroactive substances like humic substances and cytochrome C, which could promote extracellular electron transfer. Furthermore, Clostridium and Methanosarcina , as well-known electroactive microbes, were selectively enriched. The direct interspecies electron transfer between them was established via MBC. This study provided some scientific evidences to comprehensively understand the roles of MBC in anaerobic digestion, with important implications for achieving resource recovery and sludge stabilization.
研究领域:
环境工程
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生物技术
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可再生能源
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DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 6
·1338-1348
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IF 5.726
Jinchao Wang,Wenfeng Han,Shucheng Wang,Haodong Tang,Wucan Liu,Ying Li,Chunshan Lu,Jianjun Zhang,Eric M. Kennedy,Xiaonian Li
Catalytic coupling of CH4 with potent greenhouse gas CHF3 to vinylidene fluoride (VDF) was investigated over composite catalysts. Carbon-partitioned LaF3–BaF2 catalysts were prepared by PVDF (polyvinylidene fluoride)-mediated calcination. During catalyst preparation, PVDF functions as the fluorine source and carbon source. Compared with the catalysts prepared by the conventional HF co-precipitation method, the transformation of LaF3 and BaF2 to Ba1−xLaxF2+x solid solution is inhibited as Ba and La are separated by carbon layers derived from the decomposition of PVDF. The Ba1−xLaxF2+x phase is not favorable for the coupling of CH4 with CHF3 to VDF. In addition, PVDF-mediated calcination facilitates the formation of LaOF which is one of the key species for coupling of CH4 with CHF3 to VDF. O− species, which is the most active oxygen species for the activation of CH4, increases significantly following PVDF-mediated calcination due to the formation of LaOF. Consequently, the formation rate of VDF over the catalyst derived from PVDF-mediated calcination is 3.6 times higher than the HF co-precipitation catalyst at a reaction temperature of 700 °C. The formation rate of the HF co-precipitated catalyst declines to nearly half of the initial rate in a time-on-stream of 15 h. By contrast, only slight deactivation is observed over the catalyst prepared by PVDF-mediated calcination. The present work provides a promising strategy for the preparation of composite catalysts.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
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2025
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IF 4.7
Xian-Yu Shen,Ya-Nan Wang,Ya-Ting Zheng,Ye Wang,Wen-Wen Dong,Jun Zhao,Dong-Sheng Li
Formaldehyde (HCHO), a crucial industrial chemical, finds extensive applications across diverse sectors, including household products, commercial materials, aviation, and medical supplies. Methane (CH4), as an abundant C1 resource, presents a promising feedstock for HCHO synthesis. However, the direct conversion of CH4 to HCHO remains challenging due to its inherent chemical inertness, characterized by low polarizability and high C–H bond dissociation energy (439 kJ mol–1), coupled with the high reactivity of intermediate products. The development of efficient strategies for selective CH4 oxidation to high-value HCHO under mild conditions is therefore of significant practical importance. In this study, we developed a series of MIL-125-NH2@FeOOH-x heterostructured photocatalysts (FM-x) through the controlled deposition of FeOOH nanoparticles on MIL-125-NH2 surfaces. Comprehensive characterization and photocatalytic evaluations reveal that the optimized FM-1 catalyst facilitates in situ H2O2 generation and subsequent decomposition into hydroxyl radicals (•OH), enabling efficient CH4 photooxidation. Remarkably, the FM-1 catalyst achieves an exceptional HCHO production rate of 197.79 μmol·gcat–1 with >99.99% selectivity in water vapor, significantly outperforming both pristine FeOOH and MIL-125-NH2 components. This work presents a promising photocatalytic system for selective CH4 conversion, offering new insights into the design of efficient catalysts for C1 chemistry.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Fermentation-Basel
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2023
·Vol. 9
·期 9
·818
·
IF 3.7
Shuang Zhang,Pan Zhao,Ming Gao,Chuanfu Wu,Qunhui Wang,Xiaohong Sun
Anaerobic digestion (AD) has the advantages of utilizing complex substrates and producing renewable energy and is currently one of the mainstream technologies for food waste (FW) resourcing. However, at high organic loads and low inoculum-to-substrate ratios (ISRs), AD with FW as substrate is prone to acid accumulation, resulting in a drastic decrease in gas production and system collapse. This study investigated the effect of the coupled addition of zero-valent iron (ZVI) and activated carbon (AC) on the AD of FW at three low ISRs of 0.715, 0.625, and 0.5. The results showed that the control group acidified and stopped producing biogas when the ISR decreased to 0.625 and 0.5, but ZVI coupled with AC alleviated the acidification and increased the cumulative biogas yield. Especially at ISR = 0.5, the cumulative biogas yield for the ZVI + AC group was 31.5%, 99.5%, and 11.43 times higher than that of the ZVI, AC, and control groups, respectively. ZVI coupled with AC also increased the degradation of volatile fatty acids (70.5–84.4%) and soluble chemical oxygen demand (50.0–72.9%) while decreasing propionate concentration and improving the stability of the AD system. COD mass balance analyses indicated that the coupled addition of ZVI and AC promoted the conversion of particulate organic matter to soluble organic matter and increased the conversion of carbon sources to methane.Keywords:fermentation;methane production;acidification;acid accumulation
研究领域:
环境科学
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微生物学
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产品关联
DOI
高影响因子
Energy & Environmental Materials
·
2025
·
IF 14.1
Jaewon Jang,Eunchae Oh,Byung-Joo Kim,Young-Hoon Kim,Junghoon Yang,Jungpil Kim
This study investigated the efficient conversion of greenhouse gases (GHGs), CO 2 and CH 4 mixtures, into few-walled carbon nanotubes (FWCNTs) through an optimized single-step and dual-step chemical vapor deposition (CVD) process. In the single-step process for directly synthesizing FWCNTs from greenhouse gases, CO 2 concentration, gas flowrates, and H 2 addition were identified as factors influencing the growth of FWCNTs. It was demonstrated that minimizing the amounts of CO 2 and H 2 was essential for achieving complete CO 2 conversion because CO 2 acts as an oxidizing agent that hinders CNT growth, while an excess of H 2 disrupts the chemical equilibrium of the CO 2 conversion reaction, leading to side reactions that suppress FWCNTs formation. To overcome these limitations, a dual-step approach incorporating sequential catalytic reactions was developed. In the first step, the Ni/SiO 2 catalyst was utilized to facilitate CO 2 methanation, reducing CO 2 amounts while generating CH 4 -rich gas. In the second step, CH 4 pyrolysis was performed over the FeMo/MgO catalyst, enabling the growth of high-quality FWCNTs. This sequential configuration successfully synthesized FWCNTs under conditions previously unattainable in the single-step process, validating the effectiveness of the dual-step design. The strategic optimization of process parameters and sequential catalytic reactions established a viable route for converting GHGs into valuable FWCNTs.
研究领域:
化学工程
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材料科学
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环境科学
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纳米技术
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催化
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Yingying Li,Yong Men,Shuang Liu,Jinguo Wang,Kang Wang,Yuhan Tang,Wei An,Xiaoli Pan,Lin Li
Citric acid has been investigated for preparing the highly dispersed nickel catalysts on Y 2 O 3 support. A highly enhanced methanation activity with the high CO 2 conversion of 92 % and CH 4 selectivity of 100 % was obtained over Ni/Y 2 O 3 with optimum addition of citric acid at 350 °C. The citric acid additives during the preparation are found to influence the size of nickel nanoparticles and the interaction of metal and support, as estimated by various techniques, which, in turn, to correlated with the catalytic performance. In situ DRIFTS spectra further indicate the importance of small Ni particles on formation of carbonates and formate species as key intermediates and the subsequent hydrogenation of those species into methane. This study proposes that the Y-O-Ni interfacial structure formed by the strong Ni and Y 2 O 3 interaction at high citric acid addition is of prime importance for the formation of methane, benefiting from the more abundant basic sites and metallic Ni to enable CO 2 activation and hydrogenation of key intermediates by effective H 2 dissociation respectively. This work provides a new design strategy for developing highly efficient composite CO 2 methanation catalysts by control of the metal particle size and charge transfer via metal/support interface.
研究领域:
催化化学
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化学工程
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材料科学
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环境化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Qiuyue Guan,Yunhe Qu,Yujia Zhai,Wansheng Shi,Mingxing Zhao,Zhenxing Huang,Wenquan Ruan
During high salinity organic wastewater (HSOW) anaerobic digestion treatment, the process of methanogenesis can be severely inhibited in the high salinity environment, and the accumulation of volatile organic acids (VFAs) leads to failure of the anaerobic reaction. In this study, nano-magnetite and KCl were adopted to alleviate the inhibitory effect of high salinity and enhance the HSOW anaerobic digestion performance. The result showed that, under the optimal dosage of 200 mg/L, nano-magnetite addition promoted the anaerobic digestion performance, and the methane production increased by 11.06%. When KCl was added with a dosage of 0.174%, the methane production increased by 98.37%. The simultaneous addition of nano-magnetite (200 mg/L) and KCl showed a synergistic effect on enhancing HSOW anaerobic digestion performance, and the methane production increased by 124.85%. The addition of nano-magnetite and KCl promoted the conversion of VFAs, especially accelerated the degradation of propionic acid and butyric acid , also it promoted the activity of acetate kinase, dehydrogenase and F 420 , and thereby enhanced the methanogenesis process. This study could provide a new method for enhancing the anaerobic digestion of HSOW.
研究领域:
环境工程
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废水处理
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生物技术
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Lina Dai,He Wang,Yanduo Liu,Liru Cui
Direct light-driven methane selective conversion into useful chemicals remains a major challenge due to the need for photocatalysts with high photoactivity and selectivity in activating inert C-H bonds. In this study, we have developed highly photoactivity and selective photocatalytic CH 4 oxidation into C 2 H 6 using Ag-Mg tandem sites co-modified ultrathin ZnO hybrid photocatalysts in a flow reactor. Our system achieves an C 2 H 6 production rate of over 1860 μmol/g/h with 93 % selectivity, which is significantly higher than the efficiency of state-of-the-art photocatalytic systems. Various in-situ characterizations and theoretical studies reveal that the Ag-Mg tandem sites co-modified leads to enhanced photogenerated charge separation efficiency, while maintaining high ethane production rate owing to the strong selective adsorption capacity for methane and oxygen of the doped Mg sites and oxygen vacancy. Furthermore, the Ag nanoparticles cocatalyst can facilitate the removal of activated CH 4 in the form of methyl radicals in the gas phase, thereby promoting C 2 H 6 formation and inhibiting CH 4 overoxidation to produce CO 2 . Overall, these findings provide novel insights into the photocatalytic conversion of CH 4 on Ag/Mg-ZnO. These results offer valuable possibilities for developing more effective catalysts for the conversion of CH 4 to higher value-added products.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Qiang Zhou,Xinyu Wang,Tao Xing,Mingqing Wang,Mingbo Wu,Wenting Wu
Hydrogen peroxide (H 2 O 2 ) is widely used as an oxidant for photocatalytic oxidation of methane to value-added chemicals under mild conditions, but suffers from low utilization efficiency. Herein, we propose a comprehensive strategy for the proper amount of hydroxyl radicals (•OH) generation from H 2 O 2 by regulating the Pd/Au molar ratios and the total Au-Pd contents loaded on In 2 O 3 . For the photocatalytic oxidation of methane at ambient temperature, the yield and selectivity of CH 3 OH over the optimized 1.0% AuPd 0.5 /In 2 O 3 catalyst were as high as 2187.0 μmol g −1 h −1 and 94.0% respectively, exceeding most reported literatures. Mechanism investigations revealed that the formation of Au-Pd alloys may contribute to the homolytic cleavage of H 2 O 2 into •OH radicals and improve the selectivity of •OH generation. This work provides some guidance for the delicate design of photocatalysts to manipulate selective H 2 O 2 activation and efficient photocatalytic methane oxidation.
研究领域:
化学
·
催化
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Jianan Niu,Xin Kong,Qirui Che,Qingxia Li,Jin Yuan,Jianguo Liu,Yongmei Zhang
Fe 0 above the micro size (zero valent iron; ZVI) can effectively eliminate or inhibit excessive acidification during anaerobic digestion of the organic fraction of municipal solid waste, particularly at high organic loading rates. However, the role of nanoscale ZVI (NZVI) in anaerobic digestion remains controversial. In this study, the effect of NZVI at different dosages (0.4, 0.5, 0.6, 0.7, 0.8 g/g volatile solids [VS]) on the anaerobic digestion stability of the organic fraction of municipal solid waste was investigated and compared with the performance of ZVI, as were its effects on microbial syntrophism. Similarly to ZVI, NZVI recovered methane production from excessive acidification conditions, but the optimal NZVI dosage (0.4 g/gVS) was far lower than that for ZVI (0.8 g/gVS), and eventually the methane yield reached 324 mL/gVS. Microbial structure changes coupled with substance transformation revealed that NZVI enhanced the metabolism of hydrogenotrophic methanogens for interspecies hydrogen transfer and acetotrophic methanogens.
研究领域:
环境工程
·
废物管理
·
微生物学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）