JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Xinyu Hu,Jing Wang,Renjie Li,Hongjun Lin,Liguo Shen,Yanchao Xu,Meijia Zhang,Jiaheng Teng,Die Ling Zhao
Membrane separation technology is effective for treating oily wastewater but is limited by the lack of membranes that are both highly permeable and fouling-resistant. Janus membranes , with asymmetric wettability and electrostatic repulsion of charged oil droplets , offer a potential strategy for oil-water separation. This study developed novel electrically enhanced conductive Janus membranes using metal-modified organic membranes to achieve high-efficiency treatment. Conductive metal Janus membranes were fabricated using a straightforward two-step method involving simple electroless nickel plating and surface peeling. The resulting nickel-coated surface of the membrane demonstrated extreme hydrophilicity , underwater oleophobicity, and excellent conductivity (approximately 4.7 Ω). Fascinatingly, the developed membranes exhibited a “water diode” effect, facilitating unidirectional liquid transport without external pressure. Gravity-driven oil-water separation achieved a flux rate of 4874 L m −2 h −1 and over 99 % oil removal efficiency, surpassing most existing studies. During electro-filtration of oil-water emulsions, the conductive Janus membrane as a cathode generated electrostatic repulsion, preventing emulsified oil droplet adhesion. Applying an external voltage increased the flux by approximately 13 times and oil removal efficiency to 99.6 %. The membrane's separation capability remained consistent across six cycle tests, demonstrating robust stability. As all, this work first synthesized conductive “water diode” Janus membranes with high oil-water separation efficiency, offering fresh perspectives on the design and fabrication of Janus membranes as well as on the processes for treating oily wastewater.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Fang Wang,Miao Li,Zonghao Zhang,Yan Du,Yaxin Shang,Wenting Li,Yongfa Zhu,Yifei Wang
Photocatalytic synthesis of hydrogen peroxide (H 2 O 2 ) from H 2 O and O 2 is economically attractive, but its sluggish kinetics are challenging due to ineffective electron–hole separation. A novel photocatalyst for scalable H 2 O 2 production (SA-PDI@PDA) was constructed from self-assembled perylene diimide (SA-PDI) modified with dopamine (PDA) via electrostatic interaction. The donor–acceptor interface generates a 1.6-fold stronger interfacial electric field that enhances charge separation and enables the extraction of highly reductive electrons that increase the H 2 O 2 production rate 5.4-fold. The phenolic groups in PDA act as proton pockets, providing additional protons that accelerate H 2 O 2 production to 4873 μmol g⁻¹ h⁻¹ , with an apparent quantum yield of 12.35 % at 420 nm. This study provides valuable insight into the design of photocatalysts for enhanced and sustainable H 2 O 2 generation that is suitable for in situ sterilization and organic pollutant degradation applications.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMOSPHERE
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2024
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IF 8.1
Xu Yin,Jie Zhang,Siru Chen,Wei Li,Hongwei Zhu,Kajia Wei,Yonghao Zhang,Haoming Chen,Weiqing Han
In this work, an electric field-enhanced heterogeneous catalytic ozonation (EHCO) was systematically investigated using a prepared FeOx/PAC catalyst. The EHCO process exhibited high sulfadiazine (SDZ) and TOC removal efficiency compared with electrocatalysis (EC) and heterogeneous catalytic ozonation (HCO) process. Almost 100% of SDZ was removed within 2 min, and the TOC removal reached approximately 85% within 60 min. Quenching experiments and EPR analysis suggested that the prominent SDZ and TOC removal performance is supported by the enhanced ·OH generation ability. Further study proved that H 2 O 2 formed by O 2 electrochemical reduction, peroxone reaction and electrochemical reduction of ozone contributed to improving ·OH generation. Furthermore, the EHCO system showed satisfactory stability and recyclability compared to conventional HCO systems, and the SDZ and TOC removal rates were maintained at ≥95% and ≥70% in 16 consecutive recycles, respectively. Meanwhile, XPS analysis and Boehm's titration for the FeOx/PAC catalyst used in HCO and EHCO process confirmed that the external electron supply could restrain the oxidation of surface functional groups of PAC and maintain a balance of the Fe(II)/Fe(III) ratio, which proved the critical role of cathode reduction in catalyst in situ regeneration during long consecutive recycles. In addition, the EHCO system could achieve more than 80% SDZ removal within 2 min in different water matrices. These results confirmed that the EHCO process has a wide application perspective for refractory organics removal in actual wastewater.
研究领域:
环境科学
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催化化学
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水处理工程
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xiaofeng Fang,Mengchen Shi,Ziyi Zhang,Xingran Zhang,Xuzhao Yan,Fang Li,Shengtao Jiang,Yanbiao Liu
Two-dimensional MXene membranes have garnered significant attention in the field of water treatment. Nevertheless, achieving a balance between permeability and selectivity remains a fundamental challenge in MXene membrane separation. Herein, a novel electrically active nanofiltration (NF) membrane (CNT/MXene-PEI) with an ultra-thin separation layer was prepared through vacuum filtration of MXene and cross-linking of polyethyleneimine (PEI) on the CNT substrate. By controlling the thickness of the MXene separation layer to reduce mass transfer resistance and applying a negative voltage to enhance the electrostatic effect between the conductive membrane and charged pollutants, the dye rejection rate and anti-pollution performance were improved. At an optimal MXene loading of 15.625 mg/m 2 , the thickness of the separation layer was about ∼47 nm. Under these conditions, the pure water flux achieved was 156.11 LMH/bar. The rejection rate of methylene blue (MLB) increased from 26.2 % to 97.9 % under an applied voltage of −2 V, while the rejection rate for inorganic salts was 9 %. The dye/salt separation factor was approximately 11. Furthermore, the flux recovery rate of the CNT/MXene-PEI membrane was at 90 % after 12 h of operation with applied voltage of −2 V, indicating excellent anti-pollution performance and long-term operational stability. These results demonstrate the combined effect of structural regulation and electric field enhancement in the membrane's filtration performance. This study offers a new approach for overcoming the trade-off effect between permeability and selectivity in dye/salt separation processes.
研究领域:
材料科学
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环境工程
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水处理技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Gang Yu,Liping Liu,Chong Zhao,Shuaiqi Guo,Haibing Meng,Yongfa Zhu,Xian-Ming Zhang
Metal-organic frameworks (MOFs) as high-efficiency photocatalysts often face limitations due to the inadequate charge separation and sluggish charge transfer kinetics. Herein, we construct an interfacial linker coordinated heterostructure cadmium sulfide/zirconium-based metal–organic framework (CdS/NU-M) for high-efficiency photocatalytic H 2 evolution. The interfacial thiol coordination significantly narrows the energy difference between conduction band of NU-M and valence band of CdS, achieving a Z-scheme charge transfer channel in CdS/NU-M. As a result, a robust internal electric field is found in the formed Z-scheme heterojunction of CdS and NU-M, which is 20 times higher than that of NU-M. Thus, photogenerated charge carries are efficiently separated and transported to the surface, which induces CdS/NU-M with a 10-fold increase of photocatalytic H 2 evolution rate over the contrast photocatalyst, up to 84.3 mmol g −1 h −1 , prominently surpassing most of the reported MOFs and CdS-based photocatalysts. This work highlights the crucial role of interfacial linker coordination in enhancing charge separation and transfer, significantly improving the photocatalytic performance and providing an effective strategy for designing advanced photocatalysts and related technologies.
研究领域:
材料科学
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光催化
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产品关联
DOI
高影响因子
WATER RESEARCH
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2025
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IF 12.4
Liang Tian,Lei Jin,Ming Chen,Dafang Fu,Saina Zheng,Yajun Wang,Jianglei Xiong
Copper-containing industrial wastewater, characterized by strong acidity, high ionic strength, and various competing metals, presents significant challenges for Cu(II) recovery. To address these issues, an electric field-enhanced ultrafiltration process was developed, assisted with a functional polyelectrolyte with high selectivity for Cu(II). The polyelectrolyte, termed PPEI, was synthesized by grafting picolyl groups onto polyethyleneimine (PEI), enhancing its affinity for Cu(II). The captured Cu(II) was subsequently recovered through electrolysis, demonstrating a sustainable approach for both Cu recovery and PPEI recycling. The synthesis and stability of PPEI were confirmed through infrared spectroscopy, particle size analysis, and dialysis validation, ensuring its reliability in practical applications. The incorporation of picolyl groups onto PPEI enhances its selectivity for Cu(II) via coordination with two amines and four pyridyl groups per copper ion. Under acidic conditions, the maximum loading ratio of copper to PPEI is 1:4 with loading capacity of 119.4 mg/g, which increases to 1.5:4 (i.e., 179.1 mg/g) under neutral to alkaline conditions due to the deprotonation of excess amines. PPEI effectively removes Cu(II) from solutions under various harsh conditions at the loading ratio of 4, maintaining 92-98% removal efficiency in the presence of high salt concentrations (up to 1 M NaCl) and pH as low as 1, and approximately 85% removal in solutions with competing metal ions at concentrations up to 50 times higher than Cu. Scanning electron microscopy and membrane flux changes indicated that the application of an positive electric field significantly reduces membrane fouling and enhances Cu selectivity. The application of a +0.2 V voltage to the membrane side reduced the flux decline rate by 58%, significantly improving membrane performance while maintaining a Cu(II) removal efficiency of over 95%. Electrolysis optimized at a current density of ≤0.004 A/cm 2 achieved an 80% copper recovery while allowing PPEI to be released for recycling. Tests conducted using two types of real industrial wastewater demonstrated a copper removal rate of ∼95%, with a recovery rate of ∼80%. This study provides a novel and highly selective approach for the efficient recovery of valuable metals from industrial wastewaters.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ACS Omega
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2025
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IF 4.3
Jianbing Lv,Jiachen Fan,Lei Zhang,Chen Liang,Zuru Chen,Boxuan Hu,Yujun Zou,Siyu Li
The issue of clogging in highway tunnel drainage systems primarily stems from the long-term accumulation of floc-like sediments formed by the chelation of natural organic matter with metal ions. This study employed an electric field-enhanced Co(II)-mediated peroxymonosulfate system (E/Co(II)/PMS) for the efficient treatment of humic acid. Compared with the E/Co(II), Co(II)/PMS, or E/PMS systems alone, the E/Co(II)/PMS system exhibited superior humic acid removal performance, with a degradation rate of 92.3% in 30 min, which significantly improved the oxidation efficiency. The study reveals the mechanism of Co(II) activation of PMS to generate sulfate radicals (SO4•–) and hydroxyl radicals (HO•), and maintains the reaction in a sustained and efficient manner by cathode-driven Co(III)/Co(II) cycling. The experimental results showed that pH = 7, 0.2 mM Co(II), and 17 mA/cm2 current density were the optimal parameter combinations, and the degradation was inhibited by the inorganic anion CO32–, PO43–, and Cl–, which increased with its concentration, with the strongest inhibitory effect being observed for Cl–. The present study not only provides an efficient technical solution to address the issue of organic clogging in tunnel drainage systems, but also provides a theoretical and applied basis for the electrochemical oxidative degradation of organic pollutants in complex water quality through the analysis of the mechanism and optimization of the parameters.
研究领域:
环境科学
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水处理技术
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电化学工程
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产品关联
DOI
PubMed
高影响因子
iScience
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2025
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IF 4.1
Chen Chen,Siyu Zhao,Bingming Zhou,Changqing Ye,Baojiang Jiang,Liping Zhang
Mass transport is a fundamental yet often overlooked factor in influencing adsorption and photocatalytic reaction kinetics. This study examines the role of mass transport using the model system of monoclinic bismuth vanadate (BiVO 4 ) films and potassium dichromate (K 2 Cr 2 O 7 ) in a representative photocatalytic reaction. We show that diffusion-driven delivery of K 2 Cr 2 O 7 to the BiVO 4 surface increases adsorption capacity but decreases the adsorption rate constant. Notably, during the model photocatalytic reduction, long-range electric fields were observed around the illuminated BiVO 4 films, a phenomenon also confirmed in a separate reaction system using TiO 2 as the photocatalyst. These electric fields, distinct from the localized fields formed within heterojunctions, enhance dichromate transport by more than three orders of magnitude. This enhanced transport ensures a continuous supply of reactant to the photocatalyst, significantly improving reaction efficiency without additional energy input. These findings introduce a new strategy for optimizing photocatalytic processes, offering broad insights for advancing sustainable chemical engineering applications.
研究领域:
化学工程
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2021
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IF 6.901
Fei Miao,Zehao Liu,Xin Kang,Cheng Cheng,Xiaoyu Mao,Ruimeng Li,Heng Lin,Hui Zhang
Heterogeneous catalytic oxidation based on iron species for peroxymonosulfate (PMS) activation is considered as one of the most attractive strategies for wastewater treatment. However, the rate-limiting regeneration of Fe(II) from Fe(III) heavily hampers the efficient activation of PMS. In this study, the introduction of electric field to the Fe-supported bentonite (Fe-B) activated PMS process was proposed to enhance the Fe(III)/Fe(II) redox cycle. The Fe-B catalyst performed well in the removal of Acid Orange 7 (AO7) through the synergistic effect of electrolysis and the continuous redox cycle of Fe(III)/Fe(II) for PMS activation. The use of 0.5 g L −1 Fe-B catalyst and 10 mM PMS yielded nearly complete removal of the AO7 (50 mg L −1 ) in 60 min at 2 mA cm −2 of current density. Based on the results of electron paramagnetic resonance (EPR) spectroscopy, chemical quenching tests, X-ray photoelectron spectroscopy (XPS) analysis, and electrochemical measurements, the decolorization of AO7 was dominantly attributed to surface-bound radicals (SO 4 •− ads and • OH ads ) and also the direct electron transfer at DSA anode. Moreover, the electro/Fe-B/PMS system showed an effective pH range from 2.6 to 9.0 and the abatement of AO7 was slightly affected in the presence of natural background anions. This work provides a feasible strategy of PMS activation by cost-effective Fe-B catalyst coupling with electric field and gives an insight into the accelerated oxidation of recalcitrant pollutants.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Na Shi,Jiakun Wu,Xingyu Zhi,Nan Li,Zhining Wang
As a green and economical energy, nuclear power plays a significant role in the global energy supply. Uranium extraction from seawater is a highly promising strategy to utilize unconventional uranium resources and ensure the sustainability of the nuclear industry. However, the current uranium absorbents still suffer from long extraction time, low adsorption capacity, and poor selectivity. In this study, an amidoxime-functionalized cellulose nanofibers/MXene aerogel (MCA) with a three-dimensional porous structure was fabricated for efficient uranium extraction from seawater through electro-/physicochemical adsorption processes. The abundant porous structures and functional groups endowed the MCA with a high adsorption capacity of 515.46 mg/g in the physicochemical adsorption process. Furthermore, the MCA adsorbed 13.82 mg/g of uranium from natural seawater after 28 days with a superior selectivity for uranyl ions. Encouragingly, the uranium extraction performance was significantly boosted via the assistance of an electric field. By applying a voltage of 1.0 V, the MCA presented an improved extraction capacity of 1826.38 mg/g and accelerated adsorption kinetic. Meanwhile, the MCA electrode possessed good stability and high reusability of 84.30% after five adsorption–desorption cycles, which insured that MCA was a promising uranium adsorbent in long-term application. This work offers a universal paradigm for the design of highly efficient electro-adsorbents and also expands the scope of external field enhancement in the area of uranium extraction.
研究领域:
材料科学
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环境科学
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核能工程
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产品关联
DOI
高影响因子
MOLECULES
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2024
·Vol. 29
·期 17
·4196
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IF 4.2
Yongzhang Xu,Xingrui Luo,Fulin Wang,Wentao Xiang,Chensheng Zhou,Weiya Huang,Kangqiang Lu,Shaoyu Li,Man Zhou,Kai Yang
The development of efficient and environmentally friendly photocatalysts is crucial for addressing global energy and environmental challenges. Perylene diimide, an organic supramolecular material, holds great potential for applications in mineralized phenol. In this study, through the integration of different mass ratios of unmodified perylenimide (PDI-NH) into the self-assembly of amino acid-substituted perylenimide (PDI-COOH), a novel supramolecular organic heterojunction (PDICOOH/PDINH) was fabricated. The ensuing investigation focuses on its visible-light mineralized phenol properties. The results show that the optimal performance is observed with a composite mass fraction of 10%, leading to complete mineralization of 5 mg/L phenol within 5 h. The reaction exhibits one-stage kinetics with rate constants 13.80 and 1.30 times higher than those of PDI-NH and PDI-COOH, respectively. SEM and TEM reveal a heterogeneous interface between PDI-NH and PDI-COOH. Photoelectrochemical and Kelvin probe characterization confirm the generation of a built-in electric field at the interface, which is 1.73 times stronger than that of PDI-COOH. The introduction of PDI-NH promotes π-π stacking of PDI-COOH, while the built-in electric field facilitates efficient charge transfer at the interface, thereby enhancing phenol decomposition. The finding demonstrates that supramolecular heterojunctions have great potential as highly effective photocatalysts for environmental remediation applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2020
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IF 0
Junping Li,Na Chen,Shupeng Liu,Zhenyi Chen,Yana Shang,Fufei Pang,Tingyun Wang
Direct detection of drugs in the blood contributes to the study of pharmacokinetics, whereas the low-concentration blood drug makes this goal challenging. Here, silver nanoparticles (AgNPs) are used for direct detection in the blood environment. The finite element method is used to study the electric field enhancement of AgNPs in the blood environment. We study the Raman enhancement factors associated with AgNPs and study the effects of parameters such as the wavelength, medium environment, and nanoparticle distribution on near-field enhancement. The method for directly detecting oxaprozin (OXA) drug in the blood of mice is reported, which is based on surface-enhanced Raman scattering (SERS) detection. We prepare AgNPs with a diameter of 15 nm and further concentrated them as a SERS substrate to achieve low-concentration OXA solution detection in blood and aqueous environments. The minimum detection limit in the aqueous environment is 10–6 M, and the detection limit in the blood is 10–4 M (29.32 μg/mL), which is less than the peak blood drug concentration in clinical applications. Further analysis shows that OXA in the blood can be directly detected by SERS because of the characteristic peak of 1025 cm–1, and the corresponding attribution is the C–C–C plane vibration. The numerical simulation of AgNPs and the detection of OXA solution in the blood environment indicate that SERS has a good application prospect in low-concentration blood drug detection.
研究领域:
药理学
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纳米技术
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分析化学
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产品关联
DOI
危险品化学品经营许可证（带存储）