JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Lili Xu,Shuai Liu,Ling Yu,Kuiling Li,Yong Zhang,Jianbing Wang,Jun Wang
The conventional membrane technology provides an effective solution for ion separation. However, the traditional membrane is not able to tune the permselectivity during operation, and has inherent drawbacks of permeance and selectivity trade-off. In view of this, the purpose of this project is to realize controllable ion transport without impeding water filtration through electrically responsive membrane (ERMs) under electrical assistance. To achieve this, we developed electrically responsive membranes with different electrical conductivities and surface charge properties by incorporating multi-walled carbon nanotubes (CNTs) and different acids doped polyaniline (PANI). The external potential was supplied to create tuneable electrostatic interactions between surface charged ERMs and ions, which was expected to regulate and control ion transport. It was found that the developed ERMs exhibited improved rejection without decreasing the water permeance under applied potential. The responsiveness of ion rejection to the electrical potential was affected by the combined effect of charge density and electrical conductivity. The calculations based on the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory suggested that imposing an external voltage increased the surface potential of ERMs and thus improved the electrostatic repulsive force between ERMs and ions, resulting in improved ion rejection. It is believed that this simple and feasible strategy for fabrication of ERMs has a potential for practical applications in tunable ion separation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2022
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IF 7.34
Yang Chen,Ning Wang,Martin Jensen,Xianfeng Li
Nanofiber membranes have attracted considerable interest in water filtration owing to their unique structure and excellent performance, but large pore size and wide pore size distribution combined with weak inter-fiber strength are major limitations for practical applications. This work describes a facile and efficient method for nanofiber membrane fabrication with stable mechanical properties, high separation and excellent antifouling performance. The nanofiber membranes are prepared from a mixture of a low melting point polymer (thermoplastic polyurethane , TPU, T m = 52 °C) and a structural skeleton-forming polymer (polyacrylonitrile, PAN, T m = 317 °C) that undergoes electrospinning and hot-pressing. Hot-pressing treatment at 50–80 °C and 2 MPa melts the TPU phase to create inter-fiber connections, thereby reducing the nanofiber membrane pore size and improving its dimensional stability and mechanical properties. The connectivity of the nanofiber membrane can be controlled by adjusting the ratio of TPU and PAN in the nanofiber and the hot-pressing temperature. The tensile strength and Young's modulus of the hot-pressed membrane are 24.5 MPa and 630.6 MPa, which are 4.8 times and 6.0 times higher than the nascent membrane, respectively. The membrane pressed at 80 °C shows excellent filtration performance, with a high pure water flux of 8490 L m −2 h −1 and active sludge and 100 nm SiO 2 suspension retention efficiency of 99.99%. In addition, the hot-pressed membranes exhibited excellent antifouling performance and mechanical properties, meet the reusability and long-term service demand. Therefore, hot-pressed composite nanofiber membranes made of low melting point thermoplastic polymer and a skeleton polymer provide a facile and economical approach for the development of high-performance separation media.
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
POLYMER COMPOSITES
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2016
·Vol. 39
·期 7
·2411-2419
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IF 2.004
Yongqiang Yuan,Jie Li,Yuqing Liu,Ting Chen,Jinyou Lin
The composite ultrafiltration membranes were fabricated by self-assembling the aramid nanofibers (ANFs) on nonwoven fabric (NF) via layer-by-layer technique. Different numbers of ANFs layers (8, 10, 12) have been self-assembled on the NF. The surface morphology, surface wettability, tensile strength, and filtration performance of as-prepared composite membranes were investigated. The results demonstrated that the surface assembled NF with the deposition of ANFs could improve their hydrophilicity and mechanical properties. The filtration experiments indicated that the composite membranes could efficiently remove the nanoparticles from water system. When the number of ANFs layers reaches 12, 10 nm Au nanoparticles can be removed from the feed solution with a rejection rate above 90%. This work presents the feasibility of liquid filtration by using the ANFs self-assembled composite membranes, which exhibits a potential application in ultrafiltration. POLYM. COMPOS., 39:2411–2419, 2018. © 2016 Society of Plastics Engineers
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 SEPARATION SCIENCE
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2023
·Vol. 46
·期 20
·2300426
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IF 3.1
Mincong Liu,Si Huang,Linli Tan,Jiaxin Pan,Shuting Xie,Han Zuilhof,Bo Chen,Ming Ma
As acetonitrile is a widely used solvent for the chemical industry, the recovery of acetonitrile from acetonitrile wastewater is significant for both industrial cost reduction and environmental protection. In this article, a simple, low-energy, and low-cost strategy is proposed for the effective separation of acetonitrile from high-concentration acetonitrile wastewater. The approach is based on a sequential combination of two steps: salt-induced phase separation and hydrophobic filtration. The acetonitrile wastewater was first induced to split into two phases by salt, that is, the acetonitrile-rich phase and the water-rich phase, then the above two phases were poured into the hydrophobic filter paper funnel for the separation. It was shown that NaCl is a suitable salting-out reagent, and that hydrophobic filter papers—obtained from modification by butyltrichlorosilane and octyltrichlorosilane were the optimal choice for hydrophobic filtration. The salt-induced phase separation process is able to increase the volume fraction of acetonitrile in the acetonitrile-rich phase up to 92%. The acetonitrile-rich phase can pass through the hydrophobic filter paper, whereas the water-rich phase was intercepted. The hydrophobic filter paper retained strong hydrophobicity and high acetonitrile-separating capacity after 3 months storage, or upon immersion in acetonitrile-water mixtures for 12 h, or applied for 25 consecutive separations.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
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2022
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IF 10.508
Yang Xu,Yuxin Liu,Hongliang Han,Zhanfang Ma
Superhydrophilic metal–organic frameworks (MOFs) are ideal materials for many applications in an aqueous environment, such as catalysis, drug delivery, and pollute absorption. However, current approaches fail to provide either an efficient way to enhance inside aqueous diffusion or a facile method for mass production. Here, aiming at the above issues, we presented a guest-mediated strategy to rapidly produce superhydrophilic MOFs in gram scale, based on the interaction between polarized polyoxometalate guests and hydrophobic channels. Experimental observation and theoretical simulation show that the assembled guests induced aqueous diffusion into channels, promoting water transportation. The confirmatory biocatalytic application indicated enhanced water filtration and mass transfer in MOFs, which was manifested by efficient substrate conversion in biological buffers. Because this strategy was generally valid to a variety of MOFs, it would unleash the potential of MOFs in an aqueous environment and bring many possibilities to this field.
研究领域:
材料科学
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化学工程
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催化
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环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
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IF 5.532
Chenchen Zhou,Jia Man,Jianyong Li,Bin Qi,Zesheng Hua,Chenxu Liu,Minyi Zhang,Jianfeng Li
Anisotropic ceramic microparticles have been extensively studied in various fields such as mechanical transmission, wave absorbing, structural materials, and abrasives owing to their remarkable properties. The shape of the microparticles plays an important role in their functions. Here, we presented a facile and tunable microfluidic approach to fabricate the ceramic microparticles (∼370 μm in diameter) with the bowl shape, which have been quite challenging for synthesizing to date. Double UV lights were applied to shape the microparticles. By tailoring the cross angle and the intensities of both UV lights, bowl-shaped ceramic microparticles with different opening sizes (0–340 μm) and hollow spherical ceramic microparticles with different-sized through-holes ( f = 0–0.265) were fabricated. These obtained ceramic microparticles hold great potentials to be used as the micro-components in sewage filters, micro ball valves, MEMS , micro-robots, and so forth.
研究领域:
材料科学
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微流控技术
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纳米技术
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机械工程
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2014
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IF 3.552
Junping Ju,Chao Wang,Tingmei Wang,Qihua Wang
Functional terpolymer of poly(methyl methacrylate-2-hydroxyethyl methacrylate-acrylic acid) (P(MMA–HEMA–AA)) was synthesized via a radical polymerization method. The terpolymer could be directly blended with poly(vinylidene fluoride) (PVDF) to prepare the microfiltration (MF) membranes via phase separate process. The synthesized polymers were characterized by Fourier transform infrared (FTIR), the nuclear magnetic resonance proton spectra ( 1 H NMR). The membrane had the typical asymmetric structure and the hydrophilic side chains tended to aggregate on the membrane surface. The surface enrichment of amphiphilic copolymer and morphology of MF membranes were characterized by Fourier transform infrared attenuated total reflection spectroscopy (FTIR–ATR) and scanning electron microscopy (SEM). The contact angle (CA) and water uptake were also tested to assess the hydrophilicity and wetting characteristics of the polymer surface. The water filtration properties were measured. It was found the modified membranes showed excellent pH-sensitivity and pH-reversibility behavior. Furthermore, the hydrophilicity of the blended membranes increased, and the membranes showed good protein antifouling property.
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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膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）