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Synergistic enhancement of pollutant removal from high-salt wastewater using coagulation-flotation combined process

Green Chemical Engineering 2025年第3期6卷 410-419页

作者： Li, Enze Dong, Jing Jia, Yongsheng Pan, Zihe Lv, Hongzhou Du, Zhiping Gao, Guandao Cheng, Fangqin Institute of Resources and Environmental Engineering State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources Shanxi Laboratory of Yellow River Shanxi University Taiyuan030006 China School of Environmental Science & Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China

Sufficient treatment of industrial organic wastewater with high salt and large amounts of suspended particulate matter remains a challenge worldwide. In this work, a novel coagulation-flotation combined process was developed to treat the suspended particles as well as significantly reduce organic pollutants content in the actual high-salt organic wastewater. Four typical inorganic and organic flocculants (poly aluminum chloride (PAC), poly ferric sulfate (PFS), polyacrylamide (PAM), and modified cationic starch (CS)) were selected for compounding to obtain an optimized flocculation system for high-salt wastewater. The results showed that the PAC-PAM with a 10:1 ratio in mass exhibited the best coagulation behaviors with the removal efficiency of turbidity and chemical oxygen demand (COD) being 95.33% and 9.21%, respectively, under the optimal operation conditions, and the sedimentation process of coagulant conformed to the quasi-second-order kinetics. The PAC-PAM flocs exhibited stronger netting, sweeping, and adsorption bridging capabilities, which were conducive to removing suspended particles. When the flotation was conducted after coagulation, the COD decreased significantly by 20.82%. In addition, this combined process could reduce the treatment time by 50% compared to the process with only coagulation treatment. During the flotation process, floc particles companies with hydrophobic polycyclic aromatic hydrocarbons could collide and adhere to microbubbles and be floated to the surface, resulting in an effective reduction of COD. This work could provide a novel strategy and step forward to design and optimize the pretreatment process engineering for organic high-salt wastewater. © 2024 Institute of Process Engineering, Chinese Academy of Sciences.

关键词： Coagulation

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Bacterial-mediated recovery of copper from low-grade copper sulfide using fly ash and bacterial community dynamics

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International Journal of Minerals,Metallurgy and Materials 2025年第5期32卷 1044-1055页

作者： Wei Chen Ming Zhang Shenghua Yin Yun Zhou Key Laboratory of Ministry of Education for High-Efficient Mining and Safety of Metal University of Science and Technology BeijingBeijing 100083China School of Resources and Safety Engineering University of Science and Technology BeijingBeijing 100083China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China

Bioleaching is confronted with problems,such as low efficiency,long production cycle length,and vegetation *** order to solve problems above,fly ash and low-grade copper sulfide ores were used to investigate bioleaching behaviors and bacterial community *** showed that copper recovery,bacterial concentration,total proportion of main leaching bacteria including Acidithiobacillus ferrooxidans,Acidibacillus ferrooxidans,and Leptospirillum ferriphilum,were improved through using appropriate dosage of fly *** maximum copper recovery of 79.87%and bacterial concentration of 7.08×10^(7)cells·mL^(-1)were obtained after us-ing 0.8 g·L^(-1)fly *** precipitation including Zn(Fe_(3)(SO_(4))_(2)(OH)_(6))_(2)and Mg(Fe_(3)(SO_(4))_(2)(OH)_(6))_(2)was found in sample added 0.8 g·L^(-1)fly ash,which reduced the effect of hazardous ions on bacteria and thus contributing to bacterial *** com-munity structure was differentiated,which indicated difference between original inoculation and sample used 0.8 g·L^(-1)fly ash was less than *** proportion of the three microorganism above accounted for more than 95%in all tests,especially in sample with 0.8 g·L^(-1)fly ash up to 99.81%.Cl^(-)and Ag^(+)contained in fly ash can act as catalytic agent,which contributed to conversion from smooth and dense passivation layer to sparse and scattered one,and therefore improving contact between ores,lixiviant,and *** appropri-ate dosage of fly ash showed prospects in bioleaching.

关键词： low-grade copper sulfides fly ash bioleaching behavior bacterial community succession

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Atomically Dispersed Metal Atoms:Minimizing Interfacial Charge Transport Barrier for Efficient Carbon-Based Perovskite Solar Cells

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Nano-Micro Letters 2025年第5期17卷 604-616页

作者： Yanying Shi Xusheng Cheng Yudi Wang Wenrui Li Wenzhe Shang Wei Liu Wei Lu Jiashuo Cheng Lida Liu Yantao Shi State Key Laboratory of Fine Chemicals Frontier Science Center for Smart MaterialsSchool of ChemistryDalian University of TechnologyDalian 116024People’s Republic of China School of Narcotics Control and Public Order Studies Criminal Investigation PoliceUniversity of ChinaShenyang 110854People’s Republic of China

Carbon-based perovskite solar cells(C-PSCs)exhibit notable stability and ***,the power conversion efficiency(PCE)is significantly hindered by energy level mismatches,which result in interfacial charge transport barriers at the electrode-related ***,we report a back electrode that utilizes atomically dispersed metallic cobalt(Co)in carbon nanosheets(Co_1/CN)to adjust the interfacial energy *** electrons in the d-orbitals of Co atoms disrupt the electronic symmetry of the carbon nanosheets(CN),inducing a redistribution of the electronic density of states that leads to a downward shift in the Fermi level and a significantly reduced interfacial energy *** a result,the C-PSCs using Co1/CN as back electrodes achieve a notable PCE of 22.61%with exceptional long-term stability,maintaining 94.4%of their initial efficiency after 1000 h of continuous illumination without *** work provides a promising universal method to regulate the energy level of carbon electrodes for C-PSCs and paves the way for more efficient,stable,and scalable solar technologies toward commercialization.

关键词： Perovskite solar cells Carbon electrode Charge transport Energy level alignment

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Green Deep Eutectic Solvents for Lithium-Ion Battery Cathode Black Powder Impurity Removal and Precious Metal Recovery

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Energy and Fuels 2025年第20期39卷 9601-9610页

作者： Wang, Bingyan Duan, Yongzhi Gong, Shuaiqi Min, Yulin Xia, Siqing Shi, Penghui Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai University of Electric Power Shanghai200090 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200090 China State Key Laboratory Pollutant Control & Resource Reuse Tongji University Shanghai200092 China

As the electric vehicle market grows rapidly and the number of used lithium-ion batteries (LIBs) continues to increase, it is important to recycle precious metals in used LIBs in a green way. Deep eutectic solvents (DESs), which are biodegradable and green solvents, have great potential for the recovery of precious metals from LIBs. In this paper, a method is proposed for extracting precious metals in the cathode black powder of LIBs while removing aluminum impurities, which can effectively avoid the pollution and high energy consumption of traditional hydrometallurgy. Based on a novel DES consisting of betaine hydrochloride and glycerol, we integrated the extraction and removal of impurities from LIBs into one step, which greatly simplified the recovery process. By adjusting the leaching parameters, the extraction rates of Li, Ni, Co, and Mn were 99.49%, 97.23%, 97.41%, and 99.72%, respectively. The leaching process is consistent with the chemical reaction process in the shrinking nucleus model, and the synergistic effect of strong coordination ability (Cl-), acidity (H+), and reduction ability (GIy) in the DES is the key to realize the high efficiency of leaching of valuable metals. Finally, transition metals were recovered as Ni1/3Co1/3Mn1/3(OH)2, and Li was also successfully recovered as lithium oxalate. This study provides a novel, efficient, and environmentally friendly method for the recovery of precious metals from the spent LIB cathode black powder. © 2025 American Chemical Society.

关键词： Cobalt

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Single-atom iron on semi-hollow carbon synthesized by chemical waste-vapor assistance: A superior catalyst for polychlorinated biphenyls degradation

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Nano Research 2025年第2期18卷 164-172页

作者： Bingqing Wang Xu Han Jiaqiang Sun Zhichao Yun Yonghai Jiang State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental SciencesBeijing 100012China Department of Chemistry National University of SingaporeSingapore 117543Singapore Anhui Basic Discipline Research Center for Clean Energy and Catalysis College of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China

Single-atom site catalysts(SACs)with high atom utilization efficiencies exhibit unexpected properties,making them ideal candidate catalysts for numerous ***,we report a chemical-waste-vapor-assisted(CWVA)strategy for the synthesis of a catalyst with single atom Fe on semi-hollow N-doped carbon(SA-Fe/SHNC).Benefitting from its atomic Fe sites,the prepared catalyst exhibited a 103-fold higher activity(0.827 vs.0.008mol_(PCB-209)·mol_(M)^(-1)·h^(-1))and much longer time-stability(more than 50 vs.0.5 h)than benchmarked Fe_(3)0_(4) nanoparticles toward decachlorobiphenyl(PCB-209)*** and density functional theory calculations revealed that the highly active isolated Fe sites are responsible for the activity of Fe-SAC/*** addition,the CWVA method was shown to be applicable for synthesizing other single atoms on various structured supports,thereby providing new opportunities for the design of various structured SACs for different applications.

关键词： single-atomic site catalyst chemical-waste-vapor Fe-N-C hollow structure polychlorinated biphenyls(PCBs)

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Electron bridging enhanced peroxydisulfate activation and 4-chlorophenol degradation enabled by doping carbon into graphitic carbon nitride

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Journal of Industrial and Engineering Chemistry 2025年 148卷 679-689页

作者： Liu, Xinliang Cai, Kuan Zhong, Ziyi Sha, Jiulong Ji, Xingxiang Gogoi, Parikshit Song, Hainong Wang, Shuangfei Guo, Jinge State Key Laboratory of Biobased Material and Green Papermaking Qilu University of Technology Shandong State Key Laboratory of Biobased Material and Green Papermaking Shandong Academy of Sciences Jinan 250353 China Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control Guangxi University Nanning530004 China Department of Chemistry Nowgong College Assam Nagaon782001 India Guangxi Bossco Environmental Protection Technology Co. Ltd. Nanning530004 China

The peroxydisulfate (PDS)-based advanced oxidation process (AOP) has attracted great attention as an effective technique for oxidatively decomposing organic pollutants. g-C3N4, an excellent photocatalyst, has been studied to activate PDS, but the rapid photogenerated electron-hole recombination severely impedes its photocatalytic performance. Herein, highly efficient point-defect engineering by doping atoms as well as vacancies was adopted to modulate photoinduced exciton dissociation kinetics. We successfully synthesized C-doped carbon nitride (xC-g-C3N4) by a one-step copyrolysis method using glucose and melamine as raw materials. C-doped carbon nitride can act as an electron bridge for electron transfer, leading to xC-g-C3N4 with a wider light absorption range (from 475 nm to 527 nm), narrower band gap (from 2.76 eV to 2.66 eV) and higher charge separation efficiency (from 3.79 μA/cm2 to 3.22 μA/cm2). The enhanced visible light absorption performance and the reduced electron-hole pair recombination rate of xC-g-C3N4 can efficiently initiate PDS. The obtained xC-g-C3N4 catalyst exhibited superior photocatalytic activation performance of PDS for 4-CP degradation under visible light illumination. The degradation rate of 4-CP reached 88.3 %, with a total organic carbon (TOC) removal rate of approximately 87.9 %, which increased by 67.9 % and 160 %, respectively. This study highlights a new effective method of carbon doping in g-C3N4 for activating PDS in the degradation of 4-CP. © 2025 The Korean Society of Industrial and Engineering Chemistry

关键词： Point defects

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Vacuum ammonia stripping from liquid digestate:Effects of pH,alkalinity,temperature,negative pressure and process optimization

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Journal of Environmental Sciences 2025年第3期149卷 638-650页

作者： Qiuhong Chen Donghai Yang Xiang Chen Xiankai Wang Bin Dong Xiaohu Dai State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China YANGTZE Eco-Environment Engineering Research Center National Engineering Research Center of Eco-environment Protection for Yangtze River Economic BeltChina Three Gorges CorporationWuhan 430010China

High ammonia-nitrogen digestate has become a key bottleneck limiting the anaerobic digestion of organic solid *** ammonia stripping can simultaneously remove and recover ammonia nitrogen,which has attracted a lot of attention in recent *** investigate the parameter effects on the efficiency and mass transfer,five combination conditions(53℃ 15 kPa,60°C 20 kPa,65°C 25 kPa,72°C 35 kPa,and 81°C 50 kPa)were conducted for ammonia stripping of sludge *** results showed that 80%of ammonia nitrogen was stripped in 45 min for all experimental groups,but the ammonia transfer coefficient varied under different conditions,which increased with the rising of boiling point temperature,and reached the maximum value(39.0 mm/hr)at 81°C 50 *** ammonia nitrogen removal efficiency was more than 80%for 30 min vacuum stripping after adjusting the initial pH to above 9.5,and adjustment of the initial alkalinity also affects the pH value of liquid *** was found that pH and alkalinity are the key factors influencing the ammonia nitrogen dissociation and removal efficiency,while temperature and vacuum mainly affect the ammonia nitrogen mass transfer and removal *** terms of the mechanism of vacuum ammonia stripping,it underwent alkalinity destruction,pH enhancement,ammonia nitrogen dissociation,and free ammonia *** this study,two-stage experiments of alkalinity destruction and ammonia removal were also carried out,which showed that the two-stage configuration was beneficial for ammonia *** provides a theoretical basis and practical technology for the vacuum ammonia stripping from liquid digestate of organic solid waste.

关键词： Liquid digestate Vacuum ammonia stripping Alkalinity Mass transfer Process optimization

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Antifungal Activity and Potential Mechanisms of Two Bafilomycin Analogues Isolated from Streptomyces sp. NEAU-Y11 against Colletotrichum orbiculare

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Journal of Agricultural and Food Chemistry 2025年第19期73卷 11814-11828页

作者： Song, Wenshuai Yu, Xiaoyan Yu, Xiaoxin Zhang, Haifeng Zhang, Kuan Guo, Lifeng Wang, Ji-Dong Tian, Dong-Lan Yu, Qingtao Wang, Xiangjing Zhao, Junwei Xiang, Wensheng Key Laboratory of Agricultural Microbiology of Heilongjiang Province College of Plant Protection Northeast Agricultural University Harbin150030 China State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant Protection Institute of Plant Protection Chinese Academy of Agricultural Sciences Beijing100193 China Key Laboratory Vector Biology & Pathogen Control Zhejiang Province College Life Science Huzhou University Huzhou313000 China Crop Protection Syngenta China Bocheng Lu 567 Shanghai200120 China Harbin Academy of Agricultural Sciences Harbin150030 China

Cucumber anthracnose, caused by Colletotrichum orbiculare, severely affects the cucumber yield and quality. In this study, two active compounds, bafilomycin C1 and JBIR-100, were isolated from strain NEAU-Y11 and exhibited strong antifungal activity against C. orbiculare, with EC50 values of 0.0491 and 0.1042 μg/mL, respectively, significantly lower than those of the commercial fungicide (4.42 μg/mL). Pot experiments demonstrated effective control of cucumber anthracnose at 0.2 μg/mL for bafilomycin C1 and 0.4 μg/mL for JBIR-100, with efficacies reaching 78.5 and 67.7%, respectively. Microscopy and biochemical analyses indicated that both compounds disrupted the fungal cell wall, membrane, and redox homeostasis, leading to cell death. Transcriptome analysis further revealed the effects of bafilomycin C1′s on amino acid metabolism, cell structure, redox homeostasis, and DNA double-strand break repair. These findings suggest that bafilomycin C1 and JBIR-100 are promising candidates for use as agrochemical fungicides to control C. orbiculares and may serve as a basis for developing next-generation antifungal agents. © 2025 American Chemical Society.

关键词： Cell death

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AQDS Enhances Degradation of BDE-47 by Promoting Shewanella oneidensis MR-1-mediated Fenton Reaction with Fe(III)-containing Minerals

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Journal of Earth Science 2025年

作者： Yongguang Jiang Siqi Zhu Zhou Jiang Yiran Dong Liang Shi School of Environmental Studies， China University of Geosciences State Key Laboratory of Biogeology and Environmental Geology， China University of Geosciences Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science， China University of Geosciences State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution， Ministry of Ecology and Environment， China University of Geosciences(Wuhan)

Electron shuttles are widespread in the environments and play important role in microbe-mineral interaction. This study investigated the effects of a model electron shuttle (i.e.， anthraquinone-2， 6-disulfonate， AQDS) on Shewanella oneidensis MR-1-mediated Fenton reaction and subsequent degradation of 2， 2′， 4， 4′-tetrabrominated diphenyl ether (BDE-47). Three Fe(III)-containing minerals， namely， ferrihydrite， goethite and nontronite， were used as electron acceptors and Fe(II) sources. With each mineral， additions of 0.01 – 1 mM AQDS in the reactions significantly enhanced Fe(III) reduction by S. oneidensis MR-1 and increased the amounts of Fe(II) produced in anoxic phase. As a result， the amounts of cumulative ·OH formed in oxic phase were increased by 10% – 287%. Regression analysis revealed that ·OH cumulation has significant linear correlation with sorbed Fe(II) but not aqueous and structural Fe(II). This finding may be ascribed to the higher reactivity of sorbed Fe(II) in oxygenation than the latter two types of Fe(II). With more ·OH， the degradation efficiency of BDE-47 was elevated by 31% – 173%. Collectively， AQDS enhances ·OH formation and BDE-47 degradation by promoting production of Fe(II)， particularly sorbed Fe(II) in S. oneidensis MR-1-mediated Fenton reaction with Fe(III)-containing minerals.

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The isolation, identification and efficacy of Bacillus velezensis XF-8 in tomato bacterial wilt control

Advanced Agrochem

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Advanced Agrochem 2025年第1期4卷 59-69页

作者： Xu, Jiawei Jiang, Jiatong Song, Zhiye Hong, Junhuang Zhao, Tongchao Wu, Kaiwen Guo, Xueping Chen, Zhi Guan, Xiong Pan, Xiaohong State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops College of Plant Protection & Key Lab of Biopesticide and Chemical Biology Ministry of Education College of Plant Protection Fujian Agriculture and Forestry University Fujian Fuzhou 350002 China College of Resources and Environment Fujian Agriculture and Forestry University Fujian Fuzhou 350002 China

Tomato bacterial wilt is an important disease caused by Ralstonia solanacearum, which is harmful to the development of tomato industry and seriously affects the yield and quality of tomato. In this study, the strain XF-8 with antagonism against R. solanacearum was isolated from soil and identified as Bacillus velezensis, and its control effect on tomato bacterial wilt was better than that of kasugamycin. The disease index of tomato plants treated with XF-8 was significantly reduced (P < 0.05) in the pot experiment, and the control effect was 74.25 %, which was higher than 45.11 % of kasugamycin treatment group. The antibacterial activity of lipopeptide extract from the fermentation supernatant of strain XF-8 was further verified, and then the inhibitory rate of the substance at the concentration of 1 mg/mL was as high as 96.20 %. The microscopic investigations indicated that the surface of R. solanacearum was wrinkled and deformed after treating with lipopeptide extract, and most of the bacteria were dead and rupture of the cell membrane, which leading to the cell death. Meanwhile, the active oxygen was produced and the lipopeptide extract could also significantly induced DNA injuries of R. solanacearum. All these results confirmed that the isolated strain B. velezensis exhibited excellent effect of preventing and controlling the tomato bacterial wilt. Moreover, XF-8 strain has high inhibitory effect on 10 types of pathogenic fungi, which shows broad-spectrum bacteriostasis. This study provides a theoretical basis and strain resources for the development and application of biopesticides, and broadened the potential biocontrol value of B. velezensis. © 2024 The Authors

关键词： Antimicrobial mechanism Bacillus velezensis Biological control Lipopeptide extract Tomato bacterial wilt

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