JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2016
·Vol. 92
·期 3
·562-572
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IF 2.738
Yang Pan,Zongxue Yu,Heng Shi,Qi Chen,Guangyong Zeng,Haihui Di,Xiaoqing Ren,Yi He
BACKGROUND Membrane fouling is a main obstacle hindering wider application of membrane technologies, and can cause a decline in flux and increased energy consumption, and more frequent chemical or membrane replacement can increase the operating costs. Membrane fouling is mainly governed by organic fouling and biofouling. In recent years, the development of new materials has provided new methods and thoughts for the research and development of antifouling and antibacterial membranes. RESULTS In this study, to obtain both a highly hydrophilic, antifouling and antibacterial poly(vinylidene fluoride) (PVDF) membrane, in situ formed silver (Ag) nanoparticles were immobilized with silica (SiO 2 ) nanoparticles, and then chemically bound onto a PVDF ultrafiltration (UF) membrane surface. The surface modification processes were achieved through a remarkably facile and effective dip-coating method. The impacts of Ag/SiO 2 nanocomposites on membrane performance were investigated when applied in membrane filtration processes simultaneously. This membrane showed higher hydrophilicity and water permeation flux. The PVDF membrane exhibited antibacterial properties and displayed better anti-fouling performance. CONCLUSION The superior performance of the Ag/SiO 2 -PVDF membranes and this facile, effective and scalable modification method hold great promise for their practical application. This work would also be helpful for developing new antifouling and antibacterial membrane and related materials via a convenient and large-scale method. © 2016 Society of Chemical Industry
研究领域:
材料科学
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环境工程
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生物医学
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产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Dongyang Wei,Shouyong Zhou,Meisheng Li,Ailian Xue,Yan Zhang,Yijiang Zhao,Jing Zhong,Dawei Yang
Palygorskite (PGS) was incorporated into a polyvinylidene fluoride (PVDF) matrix and PVDF/PGS nanocomposite UF membranes were prepared successfully via a combination of non-solvent-induced phase separation (NIPS) and thermally-induced phase separation (TIPS) processes. The influence of the size of the PGS particles (PGS-L, 450 nm and PGS-S, 302 nm) on the membrane pore structure, morphology, mechanical strength, filtration performance and antifouling property were investigated. The results showed that the PVDF/PGS-S composite membranes had higher porosity and lower overall membrane thickness and skin layer thickness. This directly resulted in better PWF , BSA flux, BSA rejection and FRR for the membranes loaded with PGS-S, when compared with the characteristics of PVDF/PGS-L membranes. Thus, the physical structures are dominant factors in determining the separation performance of PVDF/PGS composite membranes. However, the surface roughness and thermal stability of PVDF/PGS-L membranes were greater than those of PVDF/PGS-S membranes and their surface was also more hydrophilic . Moreover, they exhibited higher mechanical strength owing to stronger binding forces and lower porosity. Thus, the composite properties of PVDF/PGS UF membranes could be adjusted by controlling the scale of the inorganic filler .
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Weili Shao,Shengli Zhu,Liang Zhu,Wanying Han,Hui Xu,Gaowei Nie,Shuaitong Liang,Rongwu Wang,Fan Liu
Effective particulate matter (PM) filtration in air has become a significant focus of scientific research due to the increased focus on environmental health and sustainable development. In this work, efficient nanofiber scale preparation technology is realized, based on our self-developed electrospinning equipment. Polyvinylidene fluoride/fluorinated polyurethane (PVDF/FPU) nanofiber composite membrane with multi-scale structure was designed and prepared, and successfully applied in the field of air filtration. PVDF/FPU ultrafine nanofibers with a diameter of 30 ± 5 nm were produced by employing high-conductivity dilute solution electrospinning. Subsequently, a PVDF/FPU composite nanofiber membrane material with a double-layer multiscale structure was constructed by adjusting the proportion and sequence of the spinning units of different scales. The results indicate that this double-layer, multiscale PVDF/FPU composite nanofiber membrane features a minute average pore size (0.36 μm), a high porosity rate (94.56 %), and outstanding hydrophobic properties (with a contact angle of 138.6°). This demonstrated exceptional filtration efficiency (99.98 %) and low filtration resistance (67 Pa) under test conditions of 32 L/min. After 10 wash cycles, the filtration efficiency remained above 99 %, indicating remarkable stability. Furthermore, the COMSOL simulation software was utilized to analyze the gradient filtration mechanism of the nanofiber membrane, which correlated well with the experimental results. The double-layer multiscale PVDF/FPU nanofiber composite membranes developed during this study offers a novel approach for creating highly efficient, low-resistance air-filtration materials.
研究领域:
材料科学
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环境科学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Jinhui Huang,Jianglin Hu,Yahui Shi,Guangming Zeng,Wenjian Cheng,Hanbo Yu,Yanling Gu,Lixiu Shi,Kaixin Yi
Recently, the application of membranes faces a big challenge due to membrane fouling, to alleviate this situation, the hybridization of photocatalysis and membrane filtration has aroused significant attention. In this study, we firstly introduced melamine, cyanuric acid and urea in dimethyl sulfoxide (DMSO) as precursors to fabricated the MCU(DMSO)-C 3 N 4 material with excellent photocatalytic performance, and immobilized it on PVDF membranes by vacuum filtration, subsequently adding polyethylene glycol and glutaraldehyde as crosslinkers from MCU-C 3 N 4 /PVDF membrane. The results demonstrate that with the MCU-C 3 N 4 ratio increasing, the membrane flux was gradually decreased. Besides, the photocatalytic efficiencies of MCU-C 3 N 4 /PVDF for rhodamine B (RhB) and tetracycline hydrochloride (TC) degradation are 84.24% and 71.26% respectively, which are about 8 times higher than that of the original membrane. To evaluate antifouling performance of photocatalytic membranes, we conducted a four-stage filtration system, and the flux recovery ratio (FRR) of MCU-C 3 N 4 /PVDF membranes reached over 80% (optimum 91%) under visible light irradiating (λ > 420 nm) for 30 min. Meanwhile, under visible light irradiation reversible fouling (Rr) gradually became the dominant fouling factor instead of the irreversible fouling (Rir), indicating the excellent antifouling performance of MCU-C 3 N 4 /PVDF membranes. This novel method to modify membranes with MCU-C 3 N 4 gives insight to photocatalytic and self-cleaning properties of photocatalytic composite membranes, providing theoretical basis for their broad 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
PubMed
高影响因子
Journal of Advanced Dielectrics
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2019
·
IF 0
Yue-Mao Dang,Ming-Sheng Zheng,Jun-Wei Zha
The influence of thermal treatment on the dielectric properties and energy storage performances of a classical dielectric nanocomposite system (barium titanate/polyvinylidene fluoride PVDF) was discussed systematically. The results demonstrated that the permittivity of thermal treated nanocomposites increased and dielectric loss decreased compared with the untreated system. In addition, the energy density was also greatly improved due to the inclined residual polarization. For example, the energy density of the treated nanocomposite with 50 vol.% nanofillers was 3.14 times higher than the untreated nanocomposite at 50 MV/m. Moreover, the charge–discharge efficiency was also promoted from 6.36% to 56.89%. According to the viewpoint of microstructure, the improvement of the dielectric and energy storage properties would be ascribed to the suppression on void defects in the interphase of dielectric nanocomposite by employing the thermal treatment process. Finally, thermal treatment turns out to be a simple and an effective method to improve the dielectric performances and energy storage properties in the dielectric nanocomposites.
研究领域:
材料科学
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能源工程
✓ 已验证
DOI
Desalination and Water Treatment
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2024
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IF 1
Lingming La,Chenyu Den,Yuanbin Mo,Yanyue Lu
Nano-silica (nSiO 2 ) was synthesized in-situ by sol–gel method, then a (polyvinylidene fluoride) PVDF-nSiO 2 hydrophobic microporous composite membrane was prepared by mixing nSiO 2 sol into casting solution using non-solvent phase inversion. The effect of nSiO 2 sol addition on the surface and cross-sectional structure of the membrane, porosity, average pore size, pure water flux, membrane flux, and hydrophobic properties was investigated. Compared with the microporous membrane without nSiO 2 sol, the cross-sectional structure of the PVDF-nSiO 2 composite membrane is fully developed, the porosity is higher, the average pore diameter is larger, and the hydrophobicity is stronger. The direct contact membrane distillation (DCMD) experiment was carried out using the prepared composite membrane to simulate seawater desalination with a 30 g/L sodium chloride solution as feed solution. Compared with the microporous membrane without nSiO 2 sol added, the membrane flux was greatly improved to 31.02 kg m –2 h –1 , and the porosity of the membrane was 75%. On the previous basis, the double coagulation bath method was employed to further improve the film-forming process. The properties and structure of the composite membrane were optimized. The membrane flux was 42.7 kg m –2 h –1 , the porosity was 78.7%, and the contact angle was 127.3°. The performance of composite membrane was greatly improved.
研究领域:
材料科学
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化学工程
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环境工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2022
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IF 4.889
Shusu Shen,Yang Shen,Yi Wu,Honglin Li,Chang Sun,Ganwei Zhang,Yongfu Guo
UiO-66-NH 2 is a well-known metal organic framework with high porosity and surface area, and there are modifiable reactive amino groups in its structure, it has been applied in membrane modifications. A novel composite membrane (U1gFx) is successfully prepared by depositing UiO-66-NH 2 onto polyvinylidene fluoride (PVDF) membrane, and subsequently grafting with perfluoroalkyl polyethoxy acetic acid (FPEOAA). The water contact angle of the modified membrane declines from 124.27° to 71.05°, and the under-water oil contact angle increases from 86.03° to 149.45°, indicating a good hydrophilic and oleophobic change. The modified membranes show enlarged porosity and water flux due to the introduction of UiO-66-NH 2 . The optimum membrane (U1gF10) shows excellent separation performance for various oil/water emulsions, including n -hexadecane, petroleum ether, dichloromethane and soybean oil. > 95 % oil rejection and up to 8081.9 L·m −2 ·h −1 of permeation flux are achieved under the vacuum filtration mode (0.085 MPa). While treating the n -hexadecane/water emulsion, all membranes show > 99 % oil rejection in six filtration cycles. Under a dead-end filtration mode, membrane U1gF10 gives a high relative flux recovery rate at 93 % under 0.1 MPa, its pure water flux still keeps as highly as 982.5 L·m −2 ·h −1 , even after three filtration cycles, indicating a good antifouling property and great engineering application potential.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 67
·62186-62192
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IF 3.289
Jianjian Cai,Shouyong Zhou,Yijiang Zhao,Ailian Xue,Yan Zhang,Meisheng Li,Weihong Xing
The hydrophilicity of a thermo-responsive PVDF/palygorskite-g-PNIPAAM hybrid ultrafiltration membrane was enhanced via surface segregation induced by coagulation bath temperature (CBT). The N1s content of the hybrid ultrafiltration membranes prepared at 5 and 20 °C is 1.77% and 1.02%, respectively while that of the membrane prepared at 40 °C is just 0.73%. This indicated that the PNIPAAM chains could be dragged to the membrane surfaces or pores via surface segregation induced by temperature. This resulted in higher hydrophilicity and permeability as well as thermo-responsiveness for membranes prepared at lower temperatures. The initial water contact angle of the PVDF/palygorskite-g-PNIPAAM hybrid ultrafiltration membrane prepared at 5 and 20 °C is 75.2° and 75°, respectively, which is about 6° lower than the one prepared at 40 °C. A higher pure water flux (PWF) of about 366 L m−2 h−1 at 40 °C was obtained for the hybrid membrane prepared at 5 °C while the one prepared at 40 °C only reached 274 L m−2 h−1. Meanwhile, membranes prepared at low temperature exhibited fewer macrovoids, lower membrane thickness and larger elongation.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Hongai Zheng,Mengyao Li,Shuangyan Jiang,Cunzheng Xiao,Meilin Zhu,Yao Zhou,Derui Wang,Xin Sun,Daquan Zhang,Lizhi Zhang
Herein, the MIL-88A/Carbon quantum dots (CQDs) was synthesized by a hydrothermal method , and the polyvinylidene fluoride (PVDF) membrane modified by the MIL-88A/CQDs was fabricated by vacuum-assisted suction filtration. Compared with the pristine membrane, MIL-88A/CQDs modified membrane based on collaborative photo-Fenton/filtration process shows better removal efficiency for methylene blue (MB), rifampicin (RIF), methyl orange (MO), and Rhodamine B (RhB). In addition, the anti-fouling properties of the modified membrane are significantly improved, and the flux recovery of the MIL-88A/CQDs modified membrane increased from 56% to 89%, and the irreversible fouling ratio (R ir ) decreased from 44% to 11%. Significantly, the modified membrane contaminated by MB within 20 min can achieve self-cleaning through the photo-Fenton process. Finally, a possible membrane antifouling mechanism is proposed: superoxide radicals (•O 2 - ) and hydroxy radicals (•OH) are the main active substances. CQDs accelerates the e − and h + separation of MIL-88A and promotes the circulation of Fe substances. The fundamental research will present a promising strategy for improving antifouling properties of membrane.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2015
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IF 3.756
Lei Wang,Danxi Huang,Xudong Wang,Xiaorong Meng,Yongtao Lv,Xin Wang,Rui Miao
To obtain a high-performance polyvinylidene fluoride (PVDF) membrane, low-temperature thermally induced phase separation (LT-TIPS) was employed to prepare microporous flat PVDF membranes and hollow-fiber membranes using diluent mixtures of triethylphosphate and diethylene glycol monoethyl ether acetate. The membrane morphology was characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The results show that thermally induced phase separation (TIPS) played a more important role than nonsolvent-induced phase separation (NIPS) in determining the cross-sectional morphology of the membranes, and the surface structure was mainly affected by NIPS in a low-temperature (0 °C) coagulation bath . By increasing the temperature of the coagulation bath, different structures of membranes, such as spherulites and cellular and sponge structures, were observed. It is believed that the formation mechanism of these membranes depended on a combined NIPS and TIPS process. Wide-angle X-ray diffraction (XRD) analysis indicated that PVDF crystallized into an α-phase crystal structure for all the membranes tested. In addition, the porosity, tensile strength and filtration performance of the flat membranes were measured. On the basis of the above results, a hollow fiber membrane with highly interconnected pores and high porosity could be prepared employing LT-TIPS.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
·
IF 2.891
Bo Gao,Weiping Chen,Jiadong Liu,Jiajun An,Lei Wang,Ying Zhu,Mika Sillanpää
Based on the concept of dynamic membrane and photocatalytic membrane reactor (PMR), the dynamic photocatalytic membrane reactor is developed via deposition of ZnIn 2 S 4 suspension on polyvinylidene fluoride (PVDF) membrane. Operating with effluent circulating to the photocatalytic membrane reactor, the highest total organic carbon (TOC) removal efficiency of 57% is obtained after 3 h reaction with 1.88 mg cm −2 photocatalyst under the flux of 84.06 L m −2 h −1 and light intensity of 50 mW cm −2 . Operating with continuous influent and effluent mode under the flux of 26.09 L m −2 h −1 and light intensity of 50 mW cm −2 , an average of 50% removal efficiency can be maintained during the 24 h photocatalytic reaction with photocatalyst loading of 1.88 mg cm −2 when the initial concentration of tetracycline is 10 mg L −1 . Under the same operating conditions, more than 92% removal efficiency can be maintained during 36 h photocatalytic reaction when lower initial concentration of 100 μg L −1 is applied. After this reaction, the characterizations show that the surface and structure of PVDF basement membrane are not affected.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Fangli Deng,Xiaoen Wang,Dan He,Ji Hu,Chunli Gong,Yun Sheng Ye,Xiaolin Xie,Zhigang Xue
A novel microporous polymer electrolyte (MPE) based on poly (vinylidene fluoride) (PVDF)/poly (ethylene oxide) (PEO) star polymer was prepared by a phase inversion technique. The effects of PEO chain length of star polymer and temperature on ionic conductivity of MPE were investigated. The results showed that the ionic conductivity increased generally with the chain length of star polymer arms without any abrupt change. Effects of star polymer mass fraction on electrolyte uptake and leakage were also discussed. The distribution of holes and connectivity was improved with star polymer mass fraction increased, thus resulted in a high ionic conductivity (3.03×10 −3 S cm −1 ) exhibited at room temperature. Moreover, the electrochemical stability window was observed above 5.0 V (vs. Li/Li + ). All these results showed that this MPE could be served as a good candidate for lithium ion batteries .
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）