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Orthochannel matrix current collector for high-rate flow electrode capacitive deionization in hypersaline environments

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Chemical engineering Journal 2025年 515卷

作者： Yue, Xilin Wan, Jinhao Zhou, Hongjian Chen, Jialiang Wang, Jin Wang, Lei Research Institute of Membrane Separation Technology of Shaanxi Province Key Laboratory of Membrane Separation of Shaanxi Province School of Environmental & Municipal Engineering Xi'an University of Architecture and Technology Xi'an710000 China Key Laboratory of Materials Physics Anhui Laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Hefei Institute of Physical Science Chinese Academy of Sciences Hefei230031 China Xi'an Gold-in Membrane Environmental Protection Technology Co. L.T.D. Xi'an710000 China

Flow electrode capacitive deionization (FCDI) offers notable advantages, including high adsorption capacity and simplified operation. However, it often suffers from unsatisfactory mass and charge transfer efficiency due to the non-ideal architecture of the current collector. In this study, an orthochannel matrix (OM) current collector was proposed as an advanced design paradigm for the FCDI technology. The orderly arranged and interconnective channels enhanced high-frequency interactions between active substances and the current collector. Additionally, the natural smoothness of graphite minimized interface resistance, thereby significantly enhancing the mass transfer process. As a result, the OM-FCDI device demonstrated superior electrochemical properties, including an exceptionally low charge transfer resistance of 0.13 Ω and a charge percolation resistance of 0.08 Ω. Moreover, compared with the serpentine channel FCDI device, charge leakage of the flow electrode was significantly mitigated, and the specific capacitance of the flow electrode material was enhanced by 52.52 %. During the desalination performance evaluation, an average salt removal rate (ASRR) of 10.42μmol cm−2 min−1 was achieved using a saline solution containing 1.0 mol L-1 NaCl, while maintaining a salt removal efficiency (SRE) of 99.86 %. Furthermore, the OM-FCDI device demonstrated remarkable efficacy in desalting natural hypersaline water, achieving over 99.70 % SREs during desalting seawater and salt-lake brine. For the desalination and enrichment of seawater from the South China Sea, the integrated FCDI system achieved water production (WPs) rates exceeding 82.40 % at desalination-to-enrichment module volume ratios ranging from 0.5 to 4.0. The above results further validated the feasibility of the OM-FCDI device for operation under challenging real-world conditions. © 2025 Elsevier B.V.

关键词： Desalination

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Is Biochar a Reliable Catalyst for Activating Persulfate? Damage of Biochar During Catalytic Process

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SSRN 2022年

作者： Wan, Jiang Wang, Gehui Liang, Weiyu Peng, Cheng Zhang, Wei Fu, Rongbing State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resource and Environmental Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China

Biochar has been believed as a low cost and metal-free catalysts for persulfate activation. However, the performance decreases of biochar after participating in the reaction, and the extent of damage to biochar remain poorly understood due to its intricate carbon structure. In this study, the two biochars (cotton stalk and walnut shell biochar) were used to activate PDS for sulfadimidine degradation, and multiple characterization methods were used to determine the damage of biochar. The comparative experiments of biochar, recycled biochar and PDS corroded biochar in catalytic reaction showed that the performance of biochars decreased by 37.5%-65.3%. After participating in the catalytic reaction, the unstable carbon in biochar was lost, and the surface of cotton stalk biochar was oxidized, which reduced its affinity to organic matter. CO2 physisorption showed that the pore structure of biochars barely changed. However, for walnut shell biochar, its adsorption capacity of nitrogen decreased obviously. Moreover, electrochemical tests showed that the conductivity of walnut shell biochar was reduced, which may lead to a decrease in the efficiency of the non-free radical pathway. Overall, the influences of catalytic process on biochar cannot be ignored, so more efforts are needed to make biochar an efficient and sustainable PS activator. © 2022, The Authors. All rights reserved.

关键词： Pore structure

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Exhaust and Evaporative Volatile Organic Compounds Emissions from Vehicles Fueled with Ethanol-Blended-Gasoline

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SSRN 2024年

作者： Li, Ruikang Zhong, Chongzhi Xu, Ruiguang Liu, Yan Song, Pengfei Zhang, Taiyu Ning, Yang Mao, Hongjun Tianjin Key Laboratory of Urban Transport Emission Research College of Environmental Science and Engineering Nankai University Tianjin300071 China China Automotive Technology & Research Center Co. Ltd Tianjin300071 China Tianjin Eco-Environmental Monitoring Center Tianjin300192 China Hebei University of Engineering Handan056009 China

By 2020, China has implemented the use of 10% ethanol-blended-gasoline (E10), which is expected to notably impact vehicular volatile organic compounds (VOCs) emissions. The adoption of E10 reduced certain emissions but raised concerns with about more reactive oxygenated volatile organic compounds (OVOCs). This study aimed to evaluate the impact of E10 on the total VOCs emissions from both exhaust and evaporative emissions by conducting tests on CHINA V and VI light-duty gasoline vehicles (LDGVs) using 0% ethanol blended gasoline (E0) and E10. E10 reduces VOCs emissions in the exhaust, as evidenced by the lower emission factors (EFs) in CHINA V and VI vehicles. Evaporative emissions showed differences in emitted VOCs, with lower EFs for CHINA V vehicles fueled with E10. The CHINA VI vehicles also exhibited reduced EFs. These findings highlight the environmental benefits of E10 in CHINA VI-compliant LDGVs;however, the effectiveness of earlier CHINA V standard vehicles requires further evaluation. © 2024, The Authors. All rights reserved.

关键词： Volatile organic compounds

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Effect of Different Hydrogen Evolution Rates at Cathode on Electrochemical Reduction of CO2 to Acetate

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SSRN 2023年

作者： Liu, Huanying Zeng, Yiwei Chen, Wenwen Liu, Chuanqi Sun, Dezhi Hu, Zhen Li, Pengsong Xu, Haiyu Wu, Hongbin Qiu, Bin Liu, Xinying Dang, Yan Beijing Key Laboratory for Source Control Technology of Water Pollution Engineering Research Center for Water Pollution Source Control and Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China School of Environmental Science & Engineering Shandong Key Laboratory of Water Pollution Control and Resource Reuse Environment Research Institute Shandong University Qingdao266237 China Technology Co. Ltd Shanghai201800 China

Microbial electrosynthesis (MES) offers a promising approach for converting CO2 into valuable chemicals such as acetate. However, the relative low conversion rate severely limits its practical application. This study investigated the impact of different hydrogen evolution rates on the conversion rate of CO2 to acetate in the MES system. Three potentials (-0.8 V, -0.9 V and -1.0 V) corresponding to various hydrogen evolution rates were set and analyzed, revealing an optimal hydrogen evolution rate, yielding a maximum acetate formation rate of 1410.9 mg/L and 73.5% coulomb efficiency. The electrochemical findings revealed that an optimal hydrogen evolution rate facilitated the formation of an electroactive biofilm. The microbial community of the cathode biofilm highlighted key genera, including Clostridium and Acetobacterium, which played essential roles in electrosynthesis within the MES system. Notably, a low hydrogen evolution rate failed to provide sufficient energy for the electrochemical reduction of CO2 to acetate, while a high rate led to cathode alkalinization, impeding the reaction and causing significant energy wastage. Therefore, maintaining an appropriate hydrogen evolution rate is crucial for the development of mature electroactive biofilms and achieving optimal performance in the MES system. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

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Machine Learning-Assisted to Study the Effect of N:P Ratio on Algae Growth to Forecasting the Bloom with Dielectric Spectroscopy Technique

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SSRN 2023年

作者： Wang, Shuhang Bingke, Yang Qu, Yihe Zhang, Dayong Chen, Junyi Russel, Mohammad Biswas, Kishore National Engineering Laboratory for Lake Pollution Control and Ecological Restoration Chinese Research Academy of Environmental Beijing100012 China School of Ocean Science and Technology Key laboratory of Industrial Ecology and Environmental Engineering Ministry of Education Dalian University of Technology Panjin124221 China Artificial Intelligence–Natural Language Processing School of Informatics Peking University Beijing100085 China

Real-time online monitoring of algal biomass has emerged as a significant challenge in contemporary marine and freshwater environmental conservation efforts aimed at safeguarding the aquatic ecosystem. Given the pivotal role that algae play in maintaining a delicate balance of nutrients and other environmental factors, the application of a machine learning-assisted dielectric spectroscopy approach represents a novel and intelligent technique for mitigating the current challenges associated with monitoring algal *** work optimized a machine learning -assisted real-time dielectric spectroscopy approach to study the effect of N:P ratios on Desmodesmus sp. growth to forecasting the blooming. As a primary feature, various N:P concentrations (1:1, 2:1, 3:1, 1:2, and 1:3) were utilized to characterize and compare the dielectric (S11(dB) & Ε'') and conventional UV-vis spectroscopy properties (OD686 & Chl-a). The dielectric measurements of S11(dB) & Ε'' are consistent with the OD686 & Chl-a value. Highest Desmodesmus sp. OD686 0.87,0.76 recorded at N:P 3:1,2:1 ratio respectively. The machine learning based PCA and linear regression model were applied and found at 0-8 days incubation time Desmodesmus sp. growth biomass negatively corelated with S11(dB) & Ε" and positively correlatedly with OD686 & Chl-a respectively, where R2 values >0.95. While the measured Ε"& S11(dB) -7.956 &-0.6775, the linear regression model was applied to predicted and forecasting OD686 for 8days and 20days was 0.817, 0.716;2.136,1.926 respectively, at the ratios N:P (3:1) and RMES value were 0.0047 & 0.0319. This analysis revealed that the machine learning- assisted model has high accuracy. Thus, Machine learning-assisted dielectric spectroscopy method could be the potential tools to real-time monitoring the algal cell biomass or forecasting the blooming to control the N:P ratios to protect the aquatic ecosystem. © 2023, The Authors. All rights reserved.

关键词： Forecasting

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Beneficial effects of AMP Scy-hepc on the gut microbiota contribute to the potential growth of Larimichthys crocea

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Blue Biotechnology 2024年第1期1卷 1-15页

作者： Sun, Hang Chen, Fangyi Hao, Hua Xiong, Ming Peng, Hui An, Zhe Wang, Ke-Jian State Key Laboratory of Marine Environmental Science College of Ocean and Earth Sciences Xiamen University Xiamen China State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology College of Ocean and Earth Sciences Xiamen University Xiamen China Fujian Innovation Research Institute for Marine Biological Antimicrobial Peptide Industrial Technology College of Ocean and Earth Sciences Xiamen University Xiamen China

In light of the global ban on antibiotics in animal feed, antimicrobial peptides (AMPs) have emerged as a compelling substitute, garnering considerable interest for their potential as feed additives. Our previous study revealed that the extended (one-year) daily administration of the AMP Scy-hepc substantially boosted the growth of Larimichthys crocea. However, the exact influence of dietary supplementation with AMPs on the gut microbiota and the potential beneficial mechanisms remain unclear. Inspired by this, the present study endeavors to examine the alterations in gut microbiota at various gut sites in L. crocea following a 60-day Scy-hepc feeding regimen, building upon our prior research efforts. Utilizing 16S rRNA sequencing, we found that dietary supplementation with Scy-hepc significantly promoted the growth of L. crocea, which may be caused by the remarkable changes in the microbial communities within the foregut and midgut. Notable changes were observed in Tenericutes, Firmicutes, Proteobacteria, Cyanobacteria and Spirochaetes. The bacterial load trends in both the foregut and midgut demonstrated a notable increase following a 60-day Scy-hepc feeding, as determined by absolute quantitative PCR analysis. Moreover, Scy-hepc supplementation increased the abundance of potential probiotics (Rhodobiaceae and Planococcaceae) and reduced the abundance of opportunistic pathogens (Flavobacteriia and Mollicutes). This led to a more intricate microbial network with enhanced metabolism-related functions, especially in lipid transport and metabolism, signal transduction mechanisms, and coenzyme transport and metabolism. And the microbial resistance (Rs) exhibits no significant change between the Scy-hepc and control groups, indicating a minimal level of toxicity to the gut microbiota of L. crocea. In summary, this study provides compelling evidences supporting the beneficial alteration of gut microbiota in the foregut and midgut as an underlying mechanism by which Scy-h

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Rationally Reconstructing Attapulgite to Mcm-41 and its Superior Application in Formaldehyde Degradation

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SSRN 2024年

作者： Chen, Dan Zhang, Jing Zhai, Ming Chen, Xin Miao, Liqi Wang, Zhong Wang, Xiaozhi College of Environmental Science and Engineering Yangzhou University Yangzhou225127 China School of Chemistry and Chemical Engineering Yangzhou University Yangzhou225002 China Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao266101 China

The inferior reactive metal dispersion caused by lack of structural defects limits the application of MCM-41 in synthesizing effective catalysts. Herein, we substituted conventional silicon source (CTAB) with attapulgite to fabricate structural defects on MCM-41. After Ag incorporation, catalytic performance tests proved this substitution favors HCHO degradation. Due to high structural stability, attapulgite rods can only merge with each other during MCM-41 construction, resulting sheet-like morphology without formation of mesoporous structure. The metal species (Al, Mg and Fe) in attapulgite improves the dispersion and size distribution of Ag nanoparticles, as well intensifies electron properties of Ag species. As for MCM-41 prepared with acidified attapulgite, the demetalization resulted in the exposure of Si-O- groups and decrease in structural stability. In subsequent MCM-41 construction, acidified attapulgite collapse into colloid particles and debris. Colloid particles would be drawn together by CTA+, leading to the formation of chrysalis-like particles with regular mesopores. Debris would also surround CTA+ and further collapse, forming cotton-like morphology with irregular mesopores. The reservation of Si-O- groups after MCM-41 construction can enhance the exposure of oxygen species and dispersion of Ag nanoparticles on both outer surface and inner mesopores. Besides, such Si-O- groups are adsorptive and reactive to HCHO. © 2024, The Authors. All rights reserved.

关键词： Formaldehyde

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Mixed Matrix Membrane for Enhanced Ethanol/Water Pervaporation Separation by Incorporation of Hydrophilic Zr-Mof Nu-906 in Chitosan

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SSRN 2023年

作者： Fu, Huayan Luo, Ruiwen Liu, Panpan Yu, Shuning Xing, Qinglei Bai, Peng Guo, Xianghai Lyu, Jiafei Department of Pharmaceutical Engineering School of Chemical Engineering and Technology Tianjin University Tianjin300350 China Tianjin University Tianjin China Tianjin Key Laboratory for Marine Environmental Research and Service School of Marine Science and Technology Tianjin University Tianjin300072 China Key Laboratory of Ocean Observation Technology of Ministry of Natural Resources School of Marine Science and Technology Tianjin University Tianjin300072 China

Achieving simultaneously enhanced selectivity and permeability is crucial to efficient ethanol pervaporation dehydration for biofuel purification. The sophisticated metal-organic frameworks (MOFs) have proven their potential as membrane fillers despite of the limited research on few frameworks. Herein, by incorporating hydrophilic microporous zirconium-based NU-906 nanoparticles into chitosan (CS), dense and uniform NU-906/CS mixed matrix membranes (MMM) were fabricated for alcohol pervaporation dehydration. The introduction of NU-906 brought excellent water affinity and structural stability to the hybrid membranes confirmed by the water contact angle and swelling resistance tests. Benefiting from the hydrophilicity and the ordered porosity of incorporated NU-906, simultaneously enhanced ethanol-water selectivity and water permeability have been achieved on the hybrid membranes where the membrane with 5.0 wt% NU-906 exhibited a high flux of 1086 g/(m2·h) and excellent separation factor of 2651 for 90 wt% ethanol dehydration at 76 ℃ and maintained stable performance within 100 h. This research has widened the species of MOF for the fabrication of MMMs and provided new options for organic solvent pervaporation dehydration. © 2023, The Authors. All rights reserved.

关键词： Chitosan

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Molecular dynamics simulation on oxidation process and interfacial performance of foamed asphalt binders based on ReaxFF force field

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Proceedings of the Royal Society A: Mathematical, Physical and engineering sciences 2025年第2309期481卷

作者： Yao, Hui Liu, Junfu Zeng, Jiani You, Zhanping Wang, Dawei Beijing Key Laboratory of Traffic Engineering Faculty of Architecture Civil and Transportation Engineering Beijing University of Technology No. 100 Pingleyuan Chaoyang Beijing100124 China School of Transportation Science and Engineering Harbin Institute of Technology Harbin150006 China Department of Civil and Environmental Engineering Michigan Technological University 1400 Townsend Drive HoughtonMI49931-1295 United States European Research Center for Advanced Transportation Infrastructure Technology Mies-van-der-Rohe-Straße 1 Aachen52074 Germany

Asphalt can deteriorate and age due to exposure to environmental conditions. This ageing reduces pavement performance and recycling waste pavement is relevant for environmental protection. The oxidation process, properties and interfacial behaviour of asphalt binders and foamed asphalt binders were discussed with the classical molecular dynamics (MD) simulation and reactive force field molecular dynamics (ReaxFF MD) simulation, as well as mineral aggregate molecular systems. The oxidized models for each asphalt molecule were proposed, which closely matched actual experimental study results. The simulation results showed that sulfur atoms oxidized the fastest, followed by benzyl carbon. As the degree of oxidation increased, the viscosity and glass transition temperature of asphalt molecules also increased. The interfacial energies of various systems were analysed, such as foamed asphalt-aged asphalt, asphalt-aggregate and asphalt-recycled aggregate. It was found that the adhesion of asphalt-aged asphalt decreased due to the presence of water, but this phenomenon was not observed in the asphalt-recycled aggregate interface when the water content was less than 2%. The mean square displacement results showed that 3% or less water content facilitated the diffusion and movement of molecules in asphalt-recycled aggregate systems, whereas, in asphalt-aggregate systems, only 1% water content was sufficient. © 2025 The Author(s).

关键词： Aggregates

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3-Aminopropyltriethoxysilane (Aptes) Silanization Onto Polyamide Layer for Efficient Dye-Salt Separation

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SSRN 2022年

作者： Li, Jian Xiao, Pei Yu, Jie Li, Lei Zhang, Yiyun Ma, Yun Liu, Fei Laboratory of Environmental Biotechnology School of Environmental and Civil Engineering Jiangnan University Wuxi214122 China Zhejiang University of Technology United States State Key Laboratory of Food Science and Technology School of Food Science and Technology International Joint Laboratory on Food Safety Jiangnan University Wuxi214122 China School of Food Science and Technology State Key Laboratory of Food Science and Technology Jiangnan University Wuxi214122 China

Improving the separation efficiency of nanofiltration (NF) membrane is considered as a major ambition to treat dyeing wastewater. Here, a facile post-treatment technology was applied to decorate the thin-film composite (TFC) NF membranes by grafting 3-aminopropyltriethoxysilane (APTES) molecules on the surface of the selective polyamide (PA) skin layer. After modification, a loose and smooth silane layer was decorated on the TFC membrane surface due to the condensation reaction, which endowed the obtained membrane an enhanced hydrophilic surface. Comparatively, APTES post-treated TFC membrane achieved a pure water flux up to 44.8 L m-2 h-1 bar-1, which was 4.7 times higher than that of the TFC-0 membrane. Meantime, the TFC-4 membrane maintained high rejections towards congo red, reactive blue-19, coomassie blue G-250 and methyl blue (> 99.0%). Further characterizations identified that the grafting of APTES on PA layer was mainly due to the amidation and condensation reaction. The results provided in this work demonstrated that post-treatment of PA-based NF membrane by utilizing the residual acyl chloride could be an efficient and easy strategy to tune the separation performance of the TFC membranes. © 2022, The Authors. All rights reserved.

关键词： Nanofiltration

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