Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Yinan Chen,Qi Peng,Chengwen Song,Yuanlu Xu,Zaijin You,Xinfei Fan
Despite the membrane technology as an efficient method for treating emulsified oily wastewater, the issue of membrane fouling remains an enormous challenge during extended operation. Hence, a unique self-assembled method was proposed to clean membrane fouling for oil/water (O/W) separation, where the tannic acid/iron (TA/Fe) coating layer improved hydrophilicity and doped with iron nanoparticles to activate peroxymonosulfate (PMS) for removing of the irreversible oil fouling. The TA/Fe coating, which contained phenolic hydroxyl groups, rendered the modified membrane superhydrophilic and underwater oleophobic properties to resist membrane surface oil droplets. The iron nanoparticles/TA/polyvinylidene fluoride (FeNPs/TA/PVDF) achieved notable permeation flux of 1571.13 L m −2 h −1 and 1490 L m −2 h −1 in O/W mixture and oil-in-water emulsion (liquid paraffin as oil phase), respectively. Meanwhile, the membrane exhibited a distinguished oil removal rate, surpassing 98 % for various emulsions (e.g. N-hexane, isooctane, soybean oil). Notably, in the pollution and cyclic experiments, the regeneration water flux of FeNPs/TA/PVDF increased from 71.7 % of pristine PVDF to 91.5 % after final modification, which proved the enhancement of the membrane anti-oil-fouling capability through the deposition of the hydrophilic coating. Moreover, after catalytic cleaning, the water permeation flux of FeNPs/TA/PVDF could reach approximately 90 % of its original value. Obviously, we observed that FeNPs/TA/PVDF exhibited a high regenerative capacity during the PMS-assisted catalytic cleaning process, where the radical and nonradical pathways coexisted. Generally, the research offered a simple approach to creating functional membranes suitable for efficient O/W separation.
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
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mengyao Xia,Yehuan Ji,Haobo Wang,Weifeng Yao
Piezocatalytic degradation of organic pollutants is emerging as a promising strategy for sustainable water treatment. However, conventional piezocatalysts, such as BaTiO 3 (BT) nanoparticles suffer from limitations such as poor recyclability, nanoparticle agglomeration, and the risk of secondary pollution. This study presents a novel strategy to overcome these limitations by integrating polydopamine (PDA)-modified BT nanoparticles into polyvinylidene fluoride (PVDF) membranes, forming PVDF/BT-PDA x nanocomposites. PDA serves as an effective surface modifier, enhancing the dispersion of BT nanoparticles, promoting the formation of polar β-phase PVDF, and strengthening interfacial interactions within the membrane matrix. The optimized PVDF/BT-PDA 5 membrane, containing 5 wt% PDA-modified BT nanoparticles, achieved a rifampicin degradation efficiency of 72.89 %, significantly surpassing that of unmodified PVDF membranes (47.77 %) and PVDF membranes with unmodified BT nanoparticles (43.4 %). Additionally, the PVDF/BT-PDA 5 membrane maintained over 90 % degradation efficiency after nine cycles, demonstrating excellent stability and reusability. These findings demonstrate that PDA-assisted integration improves both the piezocatalytic performance and recyclability of nanocomposite membranes, offering a promising and sustainable approach for water pollution remediation.
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
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yacong Yang,Zhihao Cao,Tianhan Shen,Junyang Zhang,Zuofei Gu,Mingwan Zhao,Zongli Xie,Yingchun Miao,Yuning Huo,Hexing Li
The photocatalytic membrane systems show great potential for water purification and wastewater treatment with efficient energy utilization. Herein, we develop a synergistic photocatalytic-photothermal route, based on Pd-TiO 2 /PEDOT composite immobilized in PVDF membrane, for effective water permeability and reutilization property. Novel Pd-TiO 2 /PEDOT/PVDF ultrafiltration membrane is prepared by the phase inversion method with immobilizing Pd-TiO 2 /PEDOT obtained by ultrasonic irradiation. During the removal of HA under light irradiation, Pd-TiO 2 /PEDOT/PVDF membrane presents an unexpected increasing in water flux, when compared to pristine PVDF, Pd-TiO 2 /PVDF and PEDOT/PVDF membranes, with the highest normalized flux reaches up to 2.1 and remains as 1.3 even after 300 min of irradiation. This significantly enhances the water transport, along with the achieved high rejection and anti-fouling performance. It can be attributed to synergistic photocatalytic-photothermal effect of Pd-TiO 2 /PEDOT, which is realized by their strong interaction and uniform distribution. The addition of PEDOT promotes photocatalytic effect of Pd-TiO 2 by enhancing separation of photo-induced charges. High photothermal conversion efficiency of Pd-TiO 2 /PEDOT and low temperature difference in Pd-TiO 2 /PEDOT/PVDF membrane facilitate effective thermal storage, beneficial for water transport. Meanwhile, thermal energy promotes generation of more ∙OH and ∙O 2 – radicals to remove pollutants. Synergistic photocatalytic-photothermal contribution in Pd-TiO 2 /PEDOT/PVDF membrane shows significant potential for practical application.
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
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Tian Xie,Yuanyuan Zhang,Xing Zhang,Yu-Xi Huang
The use of hydrophilic polymers for anti-oil-fouling modification of PVDF oil-water separation membranes has been extensively studied. However, the effects of different molecular structures of polymers on the membrane separation process remain unclear. Hyperbranched polylysine (HBPL) is a promising candidate for hydrophilic modification of PVDF membranes due to its branched structure and numerous amino groups. In this study, a HBPL grafted PVDF (PVDF-g-HBPL) oil-water separation membrane was designed and compared with a linear ε-polylysine (ε-PL) grafted PVDF (PVDF-g-PL) membrane. The 1 H NMR, FTIR, XPS, and SEM confirmed that the HBPL was successfully synthesized and grafted onto the PVDF membrane. The PVDF-g-HBPL membrane exhibited better separation performance and oil fouling resistance compared to the PVDF-g-PL membrane. The oil-water separation efficiency for various emulsions surpassed 90 %, and the membrane showed chemical stability under different pH conditions. Additionally, the PVDF-g-HBPL membrane showed low adhesion force, particularly under acidic or alkaline conditions, and ultralow shear friction during tangential underwater oil adhesion tests. Classic molecular dynamics (CMD) simulations revealed that the HBPL forms a stronger hydration layer and has weaker interactions with the oil molecules than the linear PL. This work highlights the importance of the hyperbranched structure in the oil-water separation system and expands the application of hyperbranched polymers in designing novel oil-water separation membranes.
研究领域:
材料科学
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环境工程
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高分子化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Hailan Ji,Ganwei Zhang,Lei Teng,Jiale Xing,Xinying Jia,Haiying Luo,Shusu Shen,Xiaoji Zhou,Dapeng Liu,Ian Wyman
An asymmetric membrane for direct contact membrane distillation (DCMD) was first prepared with the ability to concentrate strongly acidic and alkaline solutions. The membrane was fabricated by a simple coating and non-solvent phase separation process. The successful preparation of the aramid-coated polyvinylidene fluoride (PVDF) asymmetric membrane was demonstrated by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS) characterization. Furthermore, it was verified via contact angle measurements that this modified membrane had better acid and alkali resistance than the pristine PVDF membrane at an elevated temperature. During the DCMD process, the pH of the permeate side did not fluctuate significantly when solutions with different pH values were used as the feed solutions, thus also demonstrating the excellent separation efficiency of the modified PVDF membrane. Moreover, the modified PVDF membrane exhibited a higher concentration factor for acidic and alkaline solutions than the pristine membrane. Therefore, it is believed that the modified membrane has great potential for application in DCMD process with the concentration of acidic and alkaline solutions.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Results in Engineering
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2024
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IF 6
Ziteng Feng,Tong Wang,Yakai Lin,Lin Wang,Yuanhui Tang,Huanhuan Wu,Hedi Chen,Lixin Yu,Xiaolin Wang
Polyvinylidene fluoride (PVDF) membranes, widely used for their stability, face limitations due to the hardly adjustable pore size in nanoscale and inherent hydrophobicity. To address this, we proposed a co-deposition method incorporating dopamine (DA), polyethyleneimine (PEI), and silicon dioxide (SiO 2 ) nanoparticles with glutaraldehyde cross-linking for precise regulation of pore size and hydrophilicity in PVDF hollow fiber membranes. Notably, the pore diameter reduced from 119.0 ± 3.55 nm to 18.4 ± 0.36 nm, while the contact angle decreased from 107.7° to 40.9°. This simultaneous regulation led to a high-performance PDA/PEI/SiO 2 -PVDF hydrophilic ultrafiltration membrane with a rejection rate exceeding 99% for 20 nm nanoparticles in a long-term simulated separation experiment while achieving a significant protein permeability of 97% in BSA permeation experiments. Additionally, the membrane demonstrated exceptional long-term stability, offering a novel approach for tuning the performance of ultrafiltration/microfiltration membranes.
研究领域:
材料科学
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环境工程
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生物医学工程
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DOI
高影响因子
Analytical Methods
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2014
·Vol. 6
·期 16
·6316-6321
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IF 1.938
Meng Sun,Qiuhua Wu,Chun Wang,Zhi Wang
Poly(vinylidene fluoride) (PVDF) has attracted enormous attention as a membrane material with regard to its excellent properties in recent years. In this paper, a new sample preparation technique, the PVDF membrane as the extraction phase, has been applied to the extraction of four endocrine-disrupting compounds: bisphenol A (BPA), 4-t-octylphenol (4-t-OP), nonylphenol (NP), and 4-nonylphenol (4-NP) from water samples for the first time, prior to their determination by high performance liquid chromatography-ultraviolet detection. Some important experimental parameters affecting the extraction efficiency were optimized. Good linearity was observed over the concentration range of 1.0–100.0 ng mL−1 for BPA, and 2.0–100 ng mL−1 for 4-t-OP, NP and 4-NP with the correlation coefficients (r) greater than 0.9934. The limit of detection (S/N = 3) of the method was 0.2 ng mL−1 for BPA and 0.4 ng mL−1 for 4-t-OP, NP and 4-NP. The method is convenient, cost effective and can be a useful alternative approach for the extraction and determination of the endocrine-disrupting compounds in water samples.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
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IF 2.7
Atian Xie,Lei Lu,Can Wei,Jirong Luo,Tong Tian,Feiyan Wang,Quan Li,Jiaheng Pu,Jiuyun Cui,Chengcai Li
Surface modification of membranes through facile coating methods is a promising way to improve their pollution resistance and separation performance. Herein, a tea polyphenol (TP)-coated PVDF membrane (PVDF-TP) was prepared via a simple temperature-regulated oxidative polymerization. The obtained membrane exhibited a water contact angle of 0° and underwater oil contact angle of 168.2°. This superhydrophilic/underwater superoleophobic membrane showed good separation capabilities with fluxes of 88.3–169.9 L m−2 h−1 and separation efficiencies of over 98.7% for various oil-in-water emulsions under a gravity-driven process. The PVDF-TP membrane exhibited excellent stability and was capable of withstanding ultrasonic waves, bending, and agitation. Even after recycling for more than 15 times, the separation efficiency of the membrane was still above 98.7% and the flux decreased by approximately 37%, demonstrating a good antifouling performance. Considering the characteristics of its simple preparation, good antifouling performance, high separation efficiency, and good stability, the PVDF-TP membrane has broad application prospects in the field of oil–water separation.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
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2024
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IF 1.2
Tiansheng Gao,Wenzhong Ma,Xiangyuan Song,Jing Zhong,Haicun Yang,Hideto Matsuyama
The application of carbon nanotubes (CNTs) in water treatment membranes can increase the permeability and selectivity of the membranes. However, traditional CNTs are usually affected by van der Waals forces, which makes them prone to agglomerate in polymer membranes, and their non-directional arrangement in the membranes limits their transport efficiency as water channels in the membranes. In this paper, a reversible addition-fragmentation chain transfer (RAFT) polymerization method was used to synthesize propargyl methacrylate - random copolymerization - poly (ethylene glycol) methacrylate - block - polymethyl methacrylate [P(PgMA-r-PEGMA) -b-PMMA]. The P(PgMA-r-PEGMA)-b-PMMA grafting rate was 60.4% on the surface of magnetic sulfhydryl functionalized carbon nanotubes (mCNTs-SH) by click-reaction grafting. Poly (vinylidene fluoride) (PVDF)/CNTs composite ultrafiltration membranes were prepared using vapor-induced phase separation (VIPS) combined with magnetic field arraying. When the mCNTs-g-P(PgMA-r-PEGMA)-b-PMMA were vertically aligned in the PVDF membrane through a magnetic field, the effective construction of the vertical nanochannels was realized, and an increased purified water flux from 25.6 LMH to 35.8 LMH, with the composite ultrafiltration membranes was obtained. In addition, the membranes also showed excellent hydrophilicity, mechanical properties, and polyethylene glycol 1200 (PEG1200) rejection. The water contact angle was reduced from 105° to 79°, the rejection of PEG1200 was increased from 44% to 91% of the 0.5 g/L PEG aqueous solutions, and excellent mechanical properties (tensile strengthes up to 9.3 MPa) were achieved. By designing the interface structure of the CNTs and studying the orientation of the CNTs in PVDF membranes, this work provides a new research idea for the field of water treatment ultrafiltration membranes.
研究领域:
材料科学
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化学工程
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高分子科学
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纳米技术
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环境工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Jingxuan Zhao,Hongxu Liu,Yuanhang Zhao,Yuchao Qi,Ruijia Wang,Ziwei Lv,Yang Yu,Shulin Sun,Yiming Wang,Aihua Xie
Currently, the most effective way to improve the anti-fouling performance of water treatment separation membrane is to enhance the hydrophilicity of the membrane surface, but it can still cause contamination, leading to the occurrence of flux reduction. The construction of a strong hydration layer to resist wastewater contamination is still a challenging task. In this study, a defect-free hydration layer barrier was achieved by grafting chitosan polysaccharide derivatives (CS-SDAEM) on the membrane, which achieved in effective fouling prevention and low flux decline rate. A layer of tannic acid-coated carbon nanotubes (TA@CNTs) has been uniformly deposited on the commercial PVDF membrane so that the surface was rich in -COOH groups, providing sufficient reaction sites. These reactive groups facilitate the grafting of amphiphilic polymers onto the membrane. This modification strategy achieved in enhancing the antifouling performance. The modified membrane achieved low contamination rate with DR of 16.9 % for wastewater filtration, and the flux recovery rate was above 95 % with PWF of 1100 (L·m −2 ·h −1 ). The membrane had excellent anti-fouling performance, which provided a new route for the future development of water treatment membrane.
研究领域:
环境科学
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材料科学
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水处理技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2015
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IF 6.723
Xinzhen Zhao,Chunju He
On the basis of the excellent fouling resistance of zwitterionic materials, the super antifouling polyvinylidene fluoride (PVDF) membrane was efficiently prepared though one-step sulfonation of PVDF and polyaniline blend membrane in situ. The self-doped sulfonated polyaniline (SPANI) was generated as a novel zwitterionic polymer to improve the antifouling property of PVDF ultrafiltration membrane used in sewage treatment. Surface attenuated total reflection Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, surface zeta potential, and water contact angle demonstrated the successful fabrication of zwitterionic interface by convenient sulfonation modification. The static adsorption fouling test showed the quantified adsorption mass of bovine serum albumin (BSA) pollutant on the PVDF/SPANI membrane surface decreases to 3(±2) μg/cm2, and the water flux recovery ratio (FRR) values were no less than 95% for the three model pollutants of BSA, sodium alginate (SA), and humic acid (HA), which were corresponding hydrophobic, hydrophilic, and natural pollutants in sewage, respectively. This Research Article demonstrated the antifouling advantages of zwitterionic SPANI and aimed to provide a simple method for the large scale preparation of zwitterionic antifouling ultrafiltration membranes.
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
CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 32
·期 7
·880-891
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IF 1.42
Sun Tian,Zhang Yu-feng,Chen Chun-lin,Gong Xiang-zhuang,Meng Jian-qiang
Surface-initiated atom transfer radical polymerization (SI-ATRP) was used to tether poly(2-dimethylaminoethyl methacrylate) (PDMAEMA) onto microporous PVDF membranes in order to synthesize membrane adsorbers for protein adsorption. The alkaline treatment and bromine addition reaction were used to anchor ATRP initiators on membrane surface. Then PDMAEMA was grafted from the membrane surface via SI-ATRP. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) revealed the chemical composition and surface topography of the PVDF- g -PDMAEMA membrane surfaces. These results showed that PDMAEMA was grafted from the membrane surface successfully and a grafting yield as high as 1500 μg/cm 2 was achieved. The effects of the grafting time and the density of initiators on the static and dynamic binding capacity of bovine serum albumin (BSA) were systematically investigated. Both the static and dynamic binding capacities increase with the bromination and polymerization time. However, the benefits of the initiator density on binding capacities are limited by the graft density of PDMAEMA chains.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）