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One-step synthesis of a core-shell structured biochar using algae (Chlorella) powder and ferric sulfate for immobilizing Hg(II)

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Journal of Hazardous Materials 2024年 469卷 133991页

作者： Ge, Yiming Zhu, Shishu Wang, Ke Liu, Feiyu Zhang, Shiyu Wang, Rupeng Ho, Shih-Hsin Chang, Jo-Shu State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education School of Environment and Energy South China University of Technology Guangzhou510006 China Department of Chemical and Materials Engineering College of Engineering Tunghai University Taichung Taiwan Department of Chemical Engineering National Cheng Kung University Tainan701 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taiwan

Mercury (Hg) pollution poses a significant environmental challenge. One promising method for its removal is the sorption of mercuric ions using biochar. FeS-doped biochar (FBC) exhibits effective mercury adsorption, however may release excess iron into the surrounding water. To address this issue, a novel magnetic pyrrhotite/magnetite-doped biochar with a core-shell structure was synthesized for the adsorption of 2-valent mercury (Hg(II)). The proposed synthesis process involved the use of algae powder and ferric sulfate in a one-step method. By varying the ratio of ferric sulfate and alga powder (within the range of 0.18 - 2.5) had a notable impact on the composition of FBC. As the ferric sulfate content increased, the FBC exhibited a higher concentration of oxygen-containing groups. To assess the adsorption capacity, Langmuir and Freundlich adsorption models were applied to the experimental data. The most effective adsorption was achieved with FBC-4, reaching a maximum capacity (Qm) of 95.51 mg/g. In particular, at low Hg(II) concentrations, FBC-5 demonstrated the ability to reduce Hg(II) concentrations to less than 0.05 mg/L within 30 min. Additionally, the stability of FBC was confirmed within the pH range of 3.8 - 7.2. The study also introduced a model to analyze the adsorption preference for different Hg(II) species. Calomel was identified in the mercury saturated FBC, whereas the core-shell structure exhibited excellent conductivity, which most likely contributed to the minimal release of iron. In summary, this research presents a novel and promising method for synthesizing core-shell structured biochar and provides a novel approach to explore the adsorption contribution of different metal species. © 2024 Elsevier B.V.

关键词： Adsorption

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Impact of salinity on butyric acid production during anaerobic fermentation of food wastewater: Organic composition, enzyme activity and microbial community

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Bioresource technology 2025年

作者： Bizhen Zeng Kai Chen Zhuo Li Xiaohan Zhi Yumiao Zhou Yuechao Wang Tianyu Li Nasir Ali Khan Hongtao Zhu Beijing Key Lab for Source Control Technology of Water Pollution Beijing Forestry University Beijing 100083 China College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China Offshore Environmental Technology & Services Limited Beijing 100020 China

Food wastewater (FW) is rich in biodegradable organics and holds potential for producing high-value volatile fatty acids (VFAs) via anaerobic fermentation (AF). Among influencing factors, salinity plays a key role in butyric acid production, yet the underlying mechanisms remain unclear. This study investigates salinity-driven changes in butyric acid production by analyzing organic composition, enzyme activity, and microbial community shifts. Results showed that total VFAs yield remained stable (∼13 g/L) under 0–12 g/L salinity, while 10 g/L notably enhanced butyric acid accumulation (7061.4 mg/L, 86.9 % of VFAs). Further analysis revealed that high salinity accelerated substrate degradation, particularly carbohydrates and proteins, while dynamically regulating enzyme activity involved in butyric acid synthesis. Salt stress promoted the dominance of salt-tolerant bacteria, such as Bifidobacterium , and inhibited acetic acid production pathways. These findings suggest salinity can be strategically leveraged to steer AF toward high butyric acid selectivity, offering new insights into efficient FW valorization.

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Co-Occurrence of Phthalate Esters and Perfluoroalkyl Substances in Rural Drinking water Distribution Systems Affected Tap water Quality: A Field Study

SSRN

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SSRN 2022年

作者： Yin, Hong Chen, Ruya Wang, Haibo Hu, Haotian Shi, Baoyou Wang, Yili Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China School of Environmental Science and Engineering Zhejiang Gongshang University Zhejiang Hangzhou310012 China Institute of Environmental and Municipal Engineering North China University of Water Resources and Electric Power Zhengzhou450045 China University of Chinese Academy of Sciences Beijing100049 China

The widespread presence of micropollutants and microorganisms in drinking water and their adverse health effects have attracted considerable attention. However, little information about effects of phthalate esters (PAEs) and perfluoroalkyl substances (PFASs) in rural drinking water systems on tap water quality was available. Our results showed that total concentration of PAEs and PFASs ranged from 101.5 to 16465.6 ng/L, from 4.4 to 184.1 ng/L in rural drinking water of China, respectively. PAEs concentration increased and PFASs decreased in the water along the distribution of pipes. The co-occurrence of higher concentration of PAEs and PFASs in water samples and corrosion scales and deposits changed bacterial community and their functions. The bacterial community enhanced their adaption ability to the changed environment caused by PAEs and PFASs through up-regulation the function of signaling molecules and interaction and replication and repair. Under this condition, co-occurrence of perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), perfluorobutanoic acid (PFBA), perfluorohexanesulfonic acid (PFHxS), di-2-ethylhexyl phthalate (DEHP), diisobutyl phthalate (DIBP) and dibutyl phthalate (DBP) promoted potential human pathogenic bacteria growth and spread of microbiological related diseases. Contaminants including particles, microorganisms, PAEs and PFASs could be released from corrosion scales and deposits of pipes and taps, increasing cytotoxicity and microbial risk of tap water. These results were useful for the safety of rural drinking water. © 2022, The Authors. All rights reserved.

关键词： Potable water

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Inhibitory effects of biofilms on the adsorption of per- and polyfluorinated alkyl substances by biological activated carbon in practical drinking water treatment plants

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Journal of Environmental Sciences 2025年

作者： Zixin Pan Zhenguo Qi Panyue Zhang Yao Zhang Wenxian Wang Xin Huang Baoyou Shi Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Jihongtan Reservoir Chengyang District Qingdao 266100 China

Although activated carbon filters are thought to be the best way to remove per- and polyfluorinated alkyl substances (PFAS), it is yet unknown how biofilms affect PFAS removal. This study first examined how the removal of PFAS in full-scale drinking water treatment plants (DWTPs) was impacted by biofilm from biological activated carbon (BAC) of varying depths and carbon ages. PFAS desorption from BAC was visible, but at this point, BAC could still remove dissolved organic matter (DOM) efficiently. Studies have demonstrated that the use of activated carbon filters can dramatically lower the content of PFAS in water, with the amount of PFAS reducing as the filter's depth grows and its use duration increases. Additionally, pore-clogging becomes more noticeable as the biofilm ages, which reduces BAC's capacity to eliminate PFAS and hinders PFAS desorption. Furthermore, the adsorption process of PFAS may be impeded by the secretion of biofilms, which are composed of proteins and polysaccharides. Based on the analysis above, it can be the adsorption of PFAS by BAC is significantly inhibited by biofilms, according to another research. This provides theoretical direction for improving the removal effectiveness of PFAS in DWTPs.

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Rapid phosphate removal by La-Cit hybridized with Fe3O4: Performance and mechanism analysis

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Chemical Engineering Journal 2025年 514卷

作者： Hao, Haotian Huang, Xu Zhang, Yao Xu, Shuo Wang, Yili Shi, Baoyou Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water Pollution Beijing Forestry University Beijing100083 China

The efficient removal of phosphate from aqueous systems is critical for mitigating eutrophication and enhancing aquatic ecological sustainability. In this study, a regenerable magnetic composite material, designated as MLCit, was synthesized via an in-situ embedding method. This composite integrates a novel phosphate-binding lanthanum citrate complex (La-Cit) with Fe3O4 nanoparticles to achieve efficient phosphate removal. Comparative analysis revealed that MLCit-1 (La/Fe molar ratio = 1:1) exhibited enhanced adsorption performance relative to four other magnetic lanthanum-based composites (La3+/Fe3O4, La2(CO3)3/Fe3O4, La(OH)3/Fe3O4, and La2O3·xH2O/Fe3O4). Specifically, MLCit-1 demonstrated a phosphate adsorption capacity 1.5–9 times higher than those of these counterparts, with an initial adsorption rate 1.46–2.22 times greater. The phosphate adsorption capacity increased significantly with more lanthanum proportion in MLCit. Structural characterization confirmed that MLCit-4 (La/Fe molar ratio = 4:1) adopts a core–shell structure, comprising Fe3O4 nanoparticles encapsulated by amorphous La-Cit. The maximum adsorption capacity of MLCit-4 reached 77.85 mg P/g, with equilibrium achieved within 3 h at a dosage of 0.5 g/L. MLCit-4 exhibited broad pH applicability (4–11), exceptional anti-interference ability, and achieved residual phosphate concentrations below 0.05–0.1 mg P/L in four environmental water samples (TP © 2025 Elsevier B.V.

关键词： Eutrophication

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Phosphate Adsorption on Amorphous Aluminum Hydroxide-Yielded Transition Aluminas: Insights on Fundamental Chemistry and Making Engineering Adsorbents

SSRN

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SSRN 2022年

作者： Wang, Chunmei Li, Wei Zhao, Xueqin Chen, Zhen Li, Yonghuan Wang, Guichang Dou, Xiaomin Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Key Laboratory of Surficial Geochemistry Ministry of Education School of Earth Sciences and Engineering Nanjing University Nanjing210023 China College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry Ministry of Education Tianjin Key Lab and Molecule-Based Material Chemistry Synergetic Innovation Center of Chemical Science and Engineering Nankai University Tianjin300071 China

Transition aluminas (TAs) are evolved alumina polymorphs during mineral phase transformation from amorphous to crystalline structure, which have been extensively used as engineering adsorbents or platforms of functional materials for pollutants (e.g. eutrophication nutrient PO43-) mitigation in water remediation. A well-understanding of structure-binding activity of pollutants on transition aluminas is essential for developing promising water remediation materials. In this work, TAs were synthesized through annealing amorphous aluminum (oxy)hydroxide, and a decreased trend of phosphate (PO43-) adsorption was observed, which was not in pace with the changes of specific surface areas and site densities. The structure disorders of TAs deteriorated continuously peaked at 700 oC and TA at 700 oC has the largest extent of structural disorder, but does not present the highest adsorption capacity, which is not consistent with the consensus that oxides’ structural disorder facilitate adsorption. Multiple techniques including pair distribution function, selective chemical extraction, 27Al NMR and quantum chemistry were employed to reveal the underneath mechanisms of differences on phosphate adsorption behaviors on TAs. The results indicated the fraction of amorphous contents is the key feature governing PO43- adsorption, regardless of mineral phase, structural disorder, AlOIV/AlOVI arrangement, and Gibbs free energy of adsorption. Three strategic measures are suggested on making promising alumina engineering adsorbents, including tuning transition temperature, introducing non-tetrahedral and non-octahedral nanostructured grains, and employing more potential methods for synthesizing amorphous nanocrystalline composite. This work sheds lights on understanding the fundamental chemistry of phosphate on transition alumina and producing prospective alumina remediation materials. © 2022, The Authors. All rights reserved.

关键词： Alumina

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Efficient Degradation of Sulfamethoxazole by Diatomite-Supported Hydroxyl-Modified Uio-66 Photocatalyst

SSRN

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SSRN 2023年

作者： Liu, Hui-Lai Zhang, Yu Lv, Xin-Xin Cui, Min-Shu Cui, Kang-Ping Dai, Zheng-Liang Wang, Bei Weerasooriya, Rohan Chen, Xing Key Laboratory of Nanominerals and Pollution Control of Higher Education Institutes School of Resources and Environmental Engineering Hefei University of Technology Hefei230009 China Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province Institute of Industry and Equipment Technology Hefei University of Technology Hefei230009 China Anqing Changhong Chemical Co. Ltd. Anqing246002 China National Centre for Water Quality Research National Institute of Fundamental Studies Hantana Kandy Sri Lanka

Sulfamethoxazole (SMX) is a widely used antibiotic to treat bacterial infections prevalent among humans and animals. SMX undergoes several transformation pathways in living organisms and external environments. Therefore, the development of efficient remediation methods for treating SMX and its metabolites is needed. We fabricated a photo-Fenton catalyst using UIO-66 (Zr) metal-organic framework (MOF) dispersed in diatomite by a single-step solvothermal method for hydroxylation (HO-UIO-66). The HO-UIO-66-0/DE assisted Fenton process shows SMX degradation at 94.7% efficiency;however, HO-UIO-66 (Zr) is not stable. We improved the stability of the catalyst by introducing a calcination step. The calcination temperature is critical to improving the catalytic efficiency of the composite (for example, designated as HO-UIO-66/DE-300 to denote hydroxylated UIO-66 dispersed in diatomite calcined at 300 °C). The degradation of SMX by HO-UIO-66/DE-300 was 93.8% in 120 min with 4 mmol/L H2O2 at pH 3 under visible light radiation. The O1s XPS signatures signify the stability of the catalyst after repeated use for SMX degradation. The electron spin resonance spectral data suggests the role of h+, •OH, •O2-, and 1O2 in SMX degradation routes. The HO-UIO-66/DE-300 assisted Fenton process shows potential in degrading pharmaceutical products present in water and wastewater. © 2023, The Authors. All rights reserved.

关键词： Catalysts

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Perchlorate Removal by a Combined Heterotrophic and Bio-Electrochemical Hydrogen Autotrophic System

SSRN

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SSRN 2022年

作者： Qu, Dan Zhang, Junhui Wan, Dongjin Niu, Zhenhua Beijing Key Laboratory for Source Control Technology of Water Pollution Beijing Forestry University 35 Qinghua East Road Haidian District Beijing100083 China College of Environmental Science and Engineering Beijing Forestry University 35 Qinghua East Road Haidian District Beijing100083 China Collage of Environmental Engineering Henan University of Technology Zhengzhou450001 China

Here, a novel combined heterotrophic and bio-electrochemical hydrogen autotrophic (CHBHA) system was developed to remove perchlorate under low chemical dosages and energy consumption. The perchlorate removal performance at various hydraulic retention times (HRTs) and acetate dosages was investigated. For influent containing 10±0.10 mg/L perchlorate, the removal efficiency by the CHBHA system was 98.96±1.62%, 92.99±2.99%, 97.85±0.41%, and 98.24±1.56% at different operating stages. Perchlorate was mainly removed in the heterotrophic part (H-part) at a sufficient HRT (6 h) and acetate dosage (14.75 mg/L). At other stages, perchlorate was synergistically removed by the H-part and electrochemical hydrogen autotrophic part (E-part). Since the H-part removed some perchlorate, the E-part's applied current decreased, thus reducing energy costs. The maximum current efficiency of the CHBHA system was 22.09%. Compared with the single E-part system, the combined system used 65% less energy. Perchlorate was converted into active chlorine in the E-part, which improved the effluent quality. The bacterial community structures of the two parts were different. Comamonas , Dechloromonas, Acinetobacter, and Chryseobacterium were enriched in the H-part, and the dominant genera in the E-part were Thauera , Azonexus , Hydrogenophaga, and Tissierella . © 2022, The Authors. All rights reserved.

关键词： Reduction

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Transcriptomic analysis of bisphenol AF on early growth and development of zebrafish(Danio rerio)larvae

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Environmental Science and Ecotechnology 2020年第4期4卷 1-11页

作者： Rongzhen Li Shuai Liu Wenhui Qiu Feng Yang Yi Zheng Ying Xiong Guanrong Li Chunmiao Zheng State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen518055China Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen518055China School of Environmental and Chemical Engineering Shanghai UniversityShanghai200444China Shenzhen Municipal Engineering Lab of Environmental IoT Technologies Southern University of Science and TechnologyShenzhen518055Guangdong ProvinceChina

Bisphenol AF(BPAF),an alternative to bisphenol A,is widely detected in aquatic *** to health concerns,the toxic effects of BPAF on organisms are drawing *** present study aims to evaluate the toxicity of BPAF,combining the results of omics techniques and *** transcriptome sequencing(RNA-seq),we obtained 391,648,512,and 545 differentially expressed genes(DEGs)in 0.1,1,10,and 100 mg/L BPAF-exposed zebrafish larvae,*** ontology(GO)analysis and Kyoto Encyclopedia of Genes and Genomes(KEGG)enrichment revealed the early development,stimulus-response,and MAPK signaling pathway were significantly affected by *** addition,five hub genes(fgf3,fgf4,map2k1,myca,and casp3b)were highlighted as the key genes in MAPK signaling pathway using the protein-protein interaction ***,the RNA-seq results showed that early development and stimulus-response were the main processes affected by BPAF,which was consistent with our morphological and pathological *** hatching rate of zebrafish embryos in 1 and 10 mg/L BPAF groups was significantly inhibited,and the oxidative stress indexes,including the level of total antioxidant capacity(T-AOC),superoxide dismutase(SOD),and lipid peroxidation(LPO),were significantly increased by the 100 mg/L BPAF ***,the activity of alkaline phosphatase(AKP)was significantly decreased in all BPAF exposure *** conclusion,exposure to BPAF at environmental relevant concentrations affected the early development and immune system of zebrafish larvae by modulating MAPK signaling pathway,and our results provide solid evidence for the future studies on the toxicity of bisphenols.

关键词： Bisphenol AF Zebrafish Early development Oxidative stress MAPK signaling Pathway

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Ce-doped MIL-101(Fe)-derived CoO x /MnO x @Fe 2 O 3 catalysts for photothermal coupled catalytic degradation of acetone and NO

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Journal of Rare Earths 2024年

作者： Yanhong Wang Yinming Fan Yinian Zhu Zongqiang Zhu Xiaobin Zhou Yanping Zhang Shengpeng Mo The Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control Guilin University of Technology Guilin 541000 China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area Guilin University of Technology Guilin 541004 China Guangxi Engineering Research Center of Comprehensive Treatment for Agricultural Non-Point Source Pollution Guilin University of Technology Guilin 541000 China Modern Industry College of Ecology and Environmental Protection Guilin University of Technology Guilin 541000 China

The technology of photothermal catalytic degradation of acetone and conversion of nitrogen monoxide (NO) not only reduces energy consumption compared to traditional thermal catalytic oxidation technology but also improves degradation efficiency, effectively overcoming the limitations of single photocatalytic or thermal catalytic technology. This paper aims to control the lattice oxygen activity and oxygen vacancy concentration of the catalyst by optimizing the manganese-cobalt (Mn-Co) molar ratio and modifying the catalyst with Ce doping, thereby enhancing its photocatalytic and thermal catalytic performance for the degradation of acetone and NO. At 240 °C, when the Mn-Co molar ratio is 4:2, the CoO x /MnO x @Fe 2 O 3 -2 catalyst exhibits good catalytic activity for both acetone and NO, with conversion rates of 52% and 63.8% for acetone and NO, respectively. Based on the optimization of the Mn-Co molar ratio, Ce was doped into the CoO x /MnO x @Fe 2 O 3 -2 sample using the co-precipitation method to synthesize samples with different Ce doping amounts. The sample of CeO 2 /CoO x /MnO x @Fe 2 O 3 -2-0.25 ( n Mn-Co : n Ce = 1:0.25) shows the highest catalytic performance compared with the other samples, with the conversion of acetone and NO reaching 60% and 70%, respectively, at 240 °C. Additionally, the intrinsic mechanism under photothermal synergy is based on the Mars-van Krevelen redox cycle theory.

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