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Efficient remediation of different concentrations of Cr-contaminated soils by nano zero-valent iron modified with carboxymethyl cellulose and biochar

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Journal of environmental sciences 2025年第1期147卷 474-486页

作者： Lihong Xie Qiyan Ma Qingjun Chen Yiyang Liu Pengfei Guo Jinlan Zhang Guilan Duan Aijun Lin Tingting Zhang Shangyi Li Department of Environmental Science and Engineering College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China China National Petroleum and Chemical Planning Institute Beijing 100013China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Nano zero-valent iron(nZVI)is widely used in soil remediation due to its high ***,the easy agglomeration,poor antioxidant ability and passivation layer of Fe-Cr coprecipitates of nZVI have limited its application scale in Cr-contaminated soil remediation,especially in high concentration of Cr-contaminated ***,we found that the carboxymethyl cellulose on nZVI particles could increase the zeta potential value of soil and change the phase of *** with the presence of biochar,97.0%and 96.6%Cr immobilization efficiency through CMC-nZVI/BC were respectively achieved in high and low concentrations of Cr-contaminated soils after 90-days *** addition,the immobilization efficiency of Cr(VI)only decreased by 5.1%through CMC-nZVI/BC treatment after 10 weeks aging in air,attributing to the strong antioxidation *** for the surrounding Crcontaminated groundwater,the Cr(VI)removal capacity of CMC-nZVI/BC was evaluated under different reaction conditions through column experiments and COMSOL ***-nZVI/BC could efficiently remove 85%of Cr(VI)in about 400 hr when the initial Cr(VI)concentration was 40 mg/L and the flow rate was 0.5 mL/*** study demonstrates that uniformly dispersed CMC-nZVI/BC has an excellent remediation effect on different concentrations of Cr-contaminated soils.

关键词： Carboxymethyl cellulose Nanoscale zero-valent iron Biochar Cr-contaminated soils

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Cerium valence state conversion:Fabrication and environmental remediation of modified CeO_(2)materials

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Journal of Rare Earths 2025年第3期43卷 430-440,I0001页

作者： Jia'ao Han Quansheng Liu Haitao Xu Yang Wu Shukun Le Chengzhang Zhu Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resources Chemical Engineering CollegeInner Mongolia University of TechnologyHohhot010050China School of Environmental Science and Engineering Nanjing Tech UniversityNanjing210009China National Observation and Research Station of Coastal Ecological Environments in Macao Macao Environmental Research InstituteMacao University of Science and TechnologyMacao SAR999078China Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOEQingdao266042China

Rare earth elements are highly applicable in photocatalysis due to their partially filled 4f orbitals,existing in electronic structures that facilitate the transfer of electrons during the reaction *** these materials,CeO_(2)has a distinctive external electronic structure(4f^(1)5d^(1)6s^(2)),abundant oxygen vacancies,and strong conversion ability of Ce^(4+)/Ce^(3+),which makes it an attractive candidate in the field of *** broaden its practical applications in the visible region,the drawbacks of a wide band gap and a slow Ce^(4+)/Ce^(3+)cycle have been addressed through the modification of CeO_(2),thereby accelerating light absorption and self-circulation,and enhancing photocatalytic *** paper presents a review of the preparation of modified CeO_(2)catalysts and their application in the conversion of cerium valence state in the photocatalytic degradation of pollutants in ***,this paper presents a summary of the most recent development and current challenges,as well as prospect for the application of modified CeO_(2)-based materials.

关键词： Rare earths Modified CeO_(2) Ce^(4+)/Ce^(3+)pairs Photoactivity environmental remediation

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Development of an automated photolysis rates prediction system based on machine learning

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Journal of environmental sciences 2025年第5期151卷 211-224页

作者： Weijun Pan Sunling Gong Huabing Ke Xin Li Duohong Chen Cheng Huang Danlin Song State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric Chemistry of CMA Chinese Academy of Meteorological SciencesBeijing 100081China College of Environmental Sciences and Engineering Peking UniversityBeijing 100871China State Environmental Key Laboratory of Reginal Air Quality Monitoring Guangdong Ecological Environmental Monitoring CenterGuangzhou 510308China State Environmental Protection Key Laboratory of Formation and Prevention of the Urban Air Complex Shanghai Academy of Environmental SciencesShanghai 200233China Chengdu Academy of Environmental Sciences Chengdu 610072China National Observation and Research Station of Coastal Ecological Environments in Macao Macao Environmental Research InstituteMacao University of Science and TechnologyMacao 999078China

Based on observed meteorological elements,photolysis rates(J-values)and pollutant concentrations,an automated J-values predicting system by machine learning(J-ML)has been developed to reproduce and predict the J-values of O^(1)D,NO_(2),HONO,H_(2)O_(2),HCHO,and NO_(3),which are the crucial values for the prediction of the atmospheric oxidation capacity(AOC)and secondary pollutant concentrations such as ozone(O_(3)),secondary organic aerosols(SOA).The J-ML can self-select the optimal“Model+Hyperparameters”without human *** evaluated results showed that the J-ML had a good performance to reproduce the J-values wheremost of the correlation(R)coefficients exceed 0.93 and the accuracy(P)values are in the range of 0.68-0.83,comparing with the J-values from observations and from the tropospheric ultraviolet and visible(TUV)radiation model in Beijing,Chengdu,Guangzhou and Shanghai,*** hourly prediction was also well performed with R from 0.78 to 0.81 for next 3-days and from 0.69 to 0.71 for next 7-days,*** with O_(3)concentrations by using J-values from the TUV model,an emission-driven observation-based model(e-OBM)by using the J-values from the J-ML showed a 4%-12%increase in R and 4%-30%decrease in ME,indicating that the J-ML could be used as an excellent supplement to traditional numerical *** feature importance analysis concluded that the key influential parameter was the surface solar downwards radiation for all J-values,and the other dominant factors for all J-values were 2-m mean temperature,O_(3),total cloud cover,boundary layer height,relative humidity and surface pressure.

关键词： J-values Automated prediction system Machine learning Short-term prediction O_(3)simulated improvement

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Comparative Study of Proton and Heavy Ion-induced Damages for GaN-based HEMTs 24

Comparative Study of Proton and Heavy Ion-induced Damages fo...

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8th International Conference on Electronic Information technology and Computer engineering, EITCE 2024

作者： Wu, Zhipeng Huang, Huixiang Yang, Jianqun Lei, Zhifeng Cui, Xiuhai Ma, Teng Peng, Chao School of Opto-electronic and Communication Engineering Xiamen University of Technology Fujian Xiamen China National Key Laboratory of Material Behavior and Evaluation Technology in Space Environment Harbin Institute of Technology Heilongjiang Harbin China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangdong Guangzhou China

ISBN: (纸本)9798400710094

The variations of the radiation damage induced by radiation from protons and heavy ions on Cascode GaN HEMTs are comparatively studied. 300 MeV proton and 500 MeV heavy ion irradiation are carried out for AlGaN/GaN HEMTs. Findings from the study indicate that exposure to a proton flux of 300 MeV, reaching a cumulative level of 1×1011 cm-2, leads to a reduction in the output current. Concurrently, there is a downward adjustment of 0.27 volts in the turn-on voltage, along with a 5.59% decline in the peak transconductance. Following irradiation, the creation of traps within the device’s channel layer results in a decline in its electrical efficiency. Under 500 MeV heavy ion irradiation with a total fluence of 3.167×105cm-2, a significant leakage current increase is observed when a drain bias of 100 volts is applied. An enhancement in the output current is observed, accompanied by a 0.11V downward adjustment in the voltage at which the channel forms and a significant 70.17% diminution in peak transconductance. Additionally, instances of single event burnout (SEB) are detectable when the drain bias exceeds 150 V. © 2024 Copyright held by the owner/author(s).

关键词： Gallium nitride

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Green innovation unleashed:Harnessing tungsten-based nanomaterials for catalyzing solar-driven carbon dioxide conversion

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Chinese Chemical Letters 2025年第2期36卷 108-117页

作者： Weidan Meng Yanbo Zhou Yi Zhou State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and TechnologyShanghai 200237China National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery East China University of Science and TechnologyShanghai 200237China Shanghai Engineering Research Center for Multi-media Environmental Catalysis and Resource Utilization East China University of Science and TechnologyShanghai 200237China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Carbon dioxide photocatalytic reduction (CO_(2)-PR) is an efficient method for controlling CO_(2)emissions and generating cleaner energy while mitigating global *** oxides (WxOy) have attracted considerable attention for CO_(2)-PR due to their excellent spectral ***,comprehensive reviews are lacking on the use of WxOyfor CO_(2)-***,this review provides a detailed summary of t research progress made with WxOy-based catalysts in CO_(2)-*** also explains the fundamental principles of CO_(2)-PR and evaluates key performance indicators that affect the activity of WxOy-based photocatalysts,including yield,selectivity,stability,and apparent quantum ***,this review explores opportunities for synthesizing high-performance WxOy-based photocatalysts and highlights their potential for the green preparation of C1/C2 products through CO_(2)-*** innovative strategies aim to address the challenges and pressures associated with energy and environmental issues,particularly by enhancing artificial photosynthesis efficiency.

关键词： Carbon dioxide photoreduction Tungsten-based nanocatalyst Mechanism Performance evaluation Selectivity

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Cd/Pb behavior during combustion in a coal-fired power plant and their spatiotemporal impacts on soils:New insights from Cd/Pb isotopes

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Journal of environmental sciences 2025年第4期150卷 582-593页

作者： Yafei Xia Ting Gao Yuhui Liu Meng Qi Jian-Ming Zhu Hui Tong Yiwen Lv Chengshuai Liu State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementGuangdong Institute of Eco-environmental Science&TechnologyGuangdong Academy of SciencesGuangzhou 510650China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China

Coal power plants annually generate quantities of byproducts that release environmentally hazardous heavy metals like Cd and *** the behavior and spatiotemporal impacts on soils of these releases is crucial for pollution *** study investigated the concentrations and isotope ratios of Cd/Pb in combustion byproducts,depositions and soils collected froma coal-fired power plant or its surrounding *** pulverized fuel ash(PFA)and desulfurized gypsum(DG)exhibited heavier Cd isotopes withΔ^(114)Cd values of 0.304‰and 0.269‰,respectively,while bottom ash(BA)showed lighter Cd isotopes(Δ^(114)CdBA-coal=–0.078‰),compared to feed *** proposed a two-stage condensation process that governs the distribution of Cd/Pb,including accumulation on PFA and DG within electrostatic precipitators and desulfurization unit,as well as condensation onto fine particles upon release from the *** from combustion and large-scale transport make a significant contribution to deposition,while the dispersion of Cd/Pb in deposition is primarily influenced by the prevailing wind ***,the distribution of Cd/Pb in soils not only exhibit predominant wind control but is also potentially influenced by the resuspension of long-term storage *** power plant significantly contributes to soil in the NW–N–NE directions,even at a considerable distance(66%–79%),demonstrating its pervasive impact on remote regions along these ***,based on the vertical behavior in the profile,we have identified that Cd tends to migrate downward through leaching,while variations in Pb respond to the historical progression of dust removal.

关键词： Heavy metal diffusion Coal combustion Source tracing Atmospheric deposition Isotope fractionation Soil pollution

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A nanocomposite film with layer-by-layer self-assembled gold nanospheres driven by cucurbituril for the selective transport of l-tryptophan and lysozyme

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Chinese Chemical Letters 2025年第1期36卷 258-261页

作者： Hao Zhang Haonan Qu Ehsan Bahojb Noruzi Haibing Li Feng Liang The State Key Laboratory of Refractories and Metallurgy School of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan 430081China National Key Laboratory of Green Pesticide College of ChemistryCentral China Normal UniversityWuhan 430079China School of Environmental and Chemical Engineering Jiangsu Ocean UniversityLianyungang 222005China

Selective separation of amino acids and proteins is crucial in various areas of research,including proteomics,protein structure and function studies,protein purification and drug development,and biosensing and biodetection.A nanocomposite film is formed by combining layer-by-layer self-assembled gold nanospheres(Au NPs)driven by cucurbit[7]uril(CB[7])and polymethyl methacrylate(PMMA)*** to the host-guest interactions,the selective transmission of l-tryptophan in the nanocomposite film is confirmed by the current-voltage measurements using a ***,by adjusting the particle size of Au NPs to increase channel size,lysozyme containing multiple tryptophan residues can selectively pass through the nanocomposite film,indicating the high versatility and adaptability of the nanocomposite *** study will provide a new direction for the selective separation of amino acids and proteins.

关键词： Nanocomposite film Cucurbituril Gold nanospheres Host-guest interactions Selective transmission

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Bright orange-yellow emission from lead-free double perovskite single crystals with an indirect band gap

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Ceramics International 2025年第9期51卷 11372-11377页

作者： Shi, Xianzhong Sun, Shifeng Mi, Ruiyu Wang, Ziyao Lin, Weiwei Wang, Baochen School of Chemical and Environmental Engineering Anhui Polytechnic University Wuhu241000 China Shenyang Key Laboratory of Micro-arc Oxidation Technology and Application Institute of Innovative Science and Technology Shenyang University Shenyang110044 China Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences Beijing100083 China

As a novel class of luminescent material, double perovskite still encounters the problem of low luminescence efficiency. Previous reports suggested that manipulating the band gap from indirect to direct, or breaking the inversion-symmetry-induced parity-forbidden transition, can lead to a dramatic increase in emission. Our study designs a series of Cs2AgBi1-xInxCl6 double perovskite single crystals. Notably, we observe over one hundredfold luminescence enhancement in Cs2AgBi0.2In0.8Cl6 with an indirect band gap. The absorption and photoluminescence spectra suggest that an appropriate Bi/In ratio opens radiative transition channels. Furthermore, the density functional theory calculation verifies that the significant luminescence improvement is attributed to the increase in transition matrix elements of the optimal Cs2AgBi0.2In0.8Cl6, which promotes radiative recombination of photo-induced charge carriers. These carries relax to the self-trapped exciton state, and result in strong emission. Our study demonstrates that in addition to band gap type and transition parity, the transition matrix element also accounts for the photoelectric performance of double perovskite, which should be taken into consideration when designing lead-free double perovskites for optoelectronic applications. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Single crystals

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Reduced Na-S bond adsorption of WSSe enabling fast reaction kinetics in the sodium-ion battery

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Journal of Energy Chemistry 2025年第3期102卷 609-617页

作者： Ya-Ning Liao Yan-Ling Yang Xiao-Lei Shi Yu Sun Chao-Zheng He Yi Qin Li Zhang Yue-Feng Chen Zhi-Gang Chen School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021ShaanxiChina School of Chemistry and Physics ARC Research Hub in Zero-emission Power Generation for Carbon Neutralityand Centre for Materials ScienceQueensland University of TechnologyBrisbaneQueensland 4000Australia College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional MaterialsNational Laboratory of Solid-State MicrostructuresCollaborative Innovation Centre of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina Institute of Environmental and Energy Catalysis School of Materials Science and Chemical EngineeringXi’an Technological UniversityXi’an 710021ShaanxiChina

WS_(2),a two-dimensional layered material,is promising as sodium-ion batteries(SIBs)anode due to its large lnterlamellar spacing and high sodium storage ***,its low electronic conductivity and high Na^(+)adsorption energy hinder reaction *** we demonstrate that substituting Se for part of the S in WS_(2)reduces interlayer Na^(+)adsorption and increases electronic *** on this finding,lamellar WSSe,grown in situ on peanut shell-derived carbon(PSDC/WSSe),is elaborately designed as a highly stable SIB anode with a fast ***/WSSe with carbon matrix and Se substitution simultaneously provides fast electron transport channels and lowered Na^(+)transport barriers(0.22 eV).The PSDC/WSSe anode offers a considerable reversible sodium storage capacity(288.0 mAh g^(-1)after 1000 cycles at 1.0 A g^(-1))and a fast kinetic reaction.A SIB full-cell using a PSDC/WSSe anode and Na_(3)V_(2)(PO_(4))_(3)cathode achieves a 215.4 Wh kg^(-1)high energy density,and successfully powers *** work offers new strategies to lower sodium ion transportation barrier in two-dimensional layered materials.

关键词： Sodium-ion batteries Two-dimensional materials WSSe WS_(2) Peanut shell-derived carbon

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Resin-free aramid honeycombs with extraordinary microwave absorption, thermal insulation, flame retardant and mechanical performance

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Journal of Materials science and technology 2025年 233卷 132-143页

作者： Sun, Hao Zhang, Meiyun Ji, Dexian Ma, Cong Yuan, Baolong Feng, Ronghua Tan, Jiaojun Yang, Bin College of Bioresources Chemical and Materials Engineering National Demonstration Center for Experimental Light Chemistry Engineering Education Shaanxi Province Key Laboratory of papermaking Technology and Specialty Paper Development Shaanxi University of Science & Technology Xi'an710021 China Zhejiang Rongsheng Environmental Protection Paper Co. LTD. Pinghu314213 China

Although lightweight aramid paper honeycombs are highly desirable for microwave absorption owing to their dual functions of both load-bearing and microwave-absorbing, unsatisfactory microwave absorption, inferior mechanical and inadequate thermal properties present significant challenges for practical applications in diverse complex scenarios. Herein, lightweight, high-strength and flame-retardant aramid nanofibers-based honeycombs (MANHs) for integrated microwave absorption and thermal insulation are successfully fabricated via the hydrogen bonding assembly, mold forming and aerogel filling strategy using aramid waste as raw material. The dense network structure formed by the interwoven aramid nanofibers (ANFs) in the honeycomb body acts as a framework endows the MANH with impressive mechanical performance, and the specific strength and toughness of MANH reach 153.6 MPa g−1 cm−3 and 13.9 MJ m−3, respectively, which are 3.5 and 19 times higher than those of commercial microwave absorption honeycombs (CMAH). The ultralight MXene/ANFs aerogels (a density of 25 mg cm−3) with multiscale pore structure filled in the honeycomb apertures give the honeycomb outstanding microwave absorption performance, with a minimum reflection loss of −62.5 dB, and can cover the entire X-band with a thickness of only 3.5 mm. Meanwhile, compared with CMAH, the thermal insulation and flame-retardant performance of MANH are also significantly improved. Notably, MANH also demonstrates favorable sound absorption performance at high-frequency bands. The MANH is considered to be a promising candidate for aerospace and military stealth applications as a result of its lightweight, high strength, exceptional microwave absorption, and remarkable thermal insulation performance. © 2025

关键词： Nanofibers

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