SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jiguang Huang,Heng Zhang,Yuntao Zhang,Dehua Liang,Haiping Chen
Water recovery from flue gas with transport membrane condenser (TMC) has gained much attention in recent years. It has great potential in water conservation and air pollution control. However, effects of porosity and pore size variation of macroporous membranes on TMC application have not been revealed. Coal fly ash (CFA) is used as main raw material to prepare various tubular macroporous ceramic membranes for TMC application. The extrusion method is adopted. Characterization of membranes are conducted for structural parameters evaluation. Prepared membranes were used for TMC application to experimentally study the water and heat recovery performance. Influences of temperatures and flowrates of flue gas and cooling water on recovery performance have been investigated. Increasing cooling water flowrate and flue gas temperature, as well as decreasing cooling water temperature can promote water and heat recovery performance of TMC. The highest water recovery efficiency is 79.21%. Although membrane pore size increasing improves water and recovery, the average pore size should be less than 2 μm to avoid transmembrane gas permeation. Results indicate that CFA membrane is suitable for TMC application and provides investment reduction.
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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能源工程
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膜科学与技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Qianqian Lan,Yazhi Yang,Leiming Guo,Yong Wang
Highly permeable and cost-affordable membranes are highly desired in separation processes. Herein, such membranes are produced by designing gradient phenolics inside the macropores of polyvinylidene fluoride (PVDF) substrates. Solutions consisting of resol, poly(ethylene oxide)/poly(propylene oxide) copolymer and ZnCl 2 are infiltrated into the macropores of PVDF. Phenolic nanoparticles and nanopores with increasing sizes are formed across the membrane thickness after fast solvent evaporation, ZnCl 2 -facilitated resol polymerization and acid soaking. The prepared gradient phenolic@PVDF membranes exhibit a permeance up to 1315 L/(m 2 h bar), which is several times higher than that of other membranes with similar rejections to bovine serum albumin (91%) and lysozyme (71%). Moreover, the membranes are robust enough to withstand a pressure of at least 12.0 bar due to the interlaced structures of phenolics and PVDF. We demonstrate that thus-produced membranes can efficiently separate and concentrate gold nanoparticles with sizes down to 5 nm. This work suggests a new strategy for rational design of gradient porosities in macroporous substrates to produce robust membranes with high permeances and tight rejections.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
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IF 19
Lei Ge,Jiaqi Li,Gaojing Du,Kai Sheng,Jingwei Hou,Binyu Zhou,Yatao Zhang,Bart Van der Bruggen,Junyong Zhu
Microporous membranes featuring 3D nanochannels present a compelling avenue for energy-efficient liquid separations, attributable to their tunable interconnected through-pore structures. However, the rational design of 3D-nanochannel membranes that simultaneously achieve high permeance and selectivity remains a challenge, arising from the scarcity of appropriate molecular building blocks and the reliance on empirical synthetic methods. Herein, an innovative 3D polyacylhydrazone (PAH) membrane with unique pore-interconnected structures is constructed on a porous hydrogel using contorted tetrahedral aldehydes (TFS) monomers via an in situ interface-confined strategy. Manipulation of side alkyl chain lengths within terephthalohydrazide (TPH) derivates enabled the enhancement of microporosity and tunable pore environment of PAH nanofilms. Molecular dynamics simulations revealed that TPH EO linkers with higher reactivity and moderate steric hindrance facilitate superior pore interconnectivity and sharpened pore size distributions. The resulting PAH membranes achieved exceptional methanol permeances of 10.1 L m −2 h −1 bar −1 and small molecular weight cut-offs of 310 Da, outperforming the state-of-the-art polyamide membranes. This further translated into an outstanding capability in the fractionation of active pharmaceutical ingredients within organic solvent systems. This work demonstrates the efficacy of rational molecular design in developing high-microporosity membranes with tailored interconnected nanochannels, underscoring the potential of 3D microporous membranes for accurate molecular separations.
研究领域:
材料科学
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分离技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Yue Liu,Fengrui Zhang,Wenxia Zhu,Dong Su,Zhiyuan Sang,Xiao Yan,Sheng Li,Ji Liang,Shi Xue Dou
Removing contaminants from wastewater is critical to secure the global water supply. Membrane technologies for water purification are exceptionally attractive due to their high efficiency and low energy consumption. The traditional porous polymer films , however, are easy to be fouled by the organic pollutants, causing pore blockage and deteriorated separation performance. We herein report the rational design of a porous SiO 2 /GO hybrid membrane by coupling graphene oxide (GO) nanosheets with SiO 2 nanoparticles and using ethylenediamine to crosslink them, for efficient oil/water separation and dye removal. The SiO 2 nanoparticles provide an excellent hydrophilicity and underwater superoleophobicity interface, resulting in efficient and antifouling oil/water separation with an outstanding rejection rate over 99.4% for different types of oil; and the hierarchical scaffold, formed from the hydrophilic GO nanosheets embedded with SiO 2 nanoparticles, greatly facilitates the rapid permeation of water with a high flux rate of up to 2387 L m −2 h −1 for pure water and 470 L m −2 h −1 for oil/water separation. Moreover, the abundant functional groups on the GO surface also render this membrane with a high removal capability for dye blocking, enabling it to remove soluble pollutants in molecular dimensions as well. This design strategy not only provides an outstanding membrane for water purification but also sheds light on the design of multi-purpose functional membranes for a variety of energy and environment-related applications.
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
AICHE JOURNAL
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2017
·Vol. 63
·期 10
·4541-4548
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IF 2.836
Xuehua Ruan,Yan Xu,Xuhang Liao,Gaohong He,Xiaoming Yan,Yan Dai,Ning Zhang,Lin Du
Heavy metal ions (HMIs) in wastewater can be removed by polyethyleneimine (PEI) adsorption, however, it is difficult to recycle PEI macromolecules from their mixture with suspended particles in wastewater. A novel HMIs adsorption technique with renewable PEI-grafted porous membranes was developed. PEI molecules were dispersed with high specific area and structured morphology, which allowed HMIs and suspended particles to be retained separately at different locations of the membrane, with the former adsorbed in matrix and the latter rejected on surface. The membranes with the optimized PEI loading ratio of 30 k wt % behaved excellently with microsphere rejection and Co(II) adsorption reaching 98.5% and 51.0 mg/g, respectively. They successfully decreased Co(II) concentration from 3.0 mg/L to the allowable discharge standard (0.5 mg/L), even with an enhanced flux of 6200 L/m 2 /h at 0.12 MPa under the cyclic tests. Overall, PEI-grafted membrane adsorption is highly efficient for removing HMIs and suspended particles simultaneously from wastewater. © 2017 American Institute of Chemical Engineers AIChE J , 63: 4541–4548, 2017
研究领域:
环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 11
·2245
·
IF 4.967
Lin Qiao,Shumin Liu,Maolin Fang,Mingjun Yang,Xiangkun Ma
The iron–chromium flow battery (ICFB), the earliest flow battery, shows promise for large-scale energy storage due to its low cost and inherent safety. However, there is no specific membrane designed that meets the special requirements of ICFBs. To match the harsh operation parameters of ICFBs, we designed and fabricated a composite membrane with high mechanical, chemical, and thermal stability. In the design, a commercial porous polyethylene membrane is selected as the framework material, offering high mechanical stability and reducing the cost. Meanwhile, the Nafion resin is filled in the pores of a porous membrane, which inhibits the transfer of redox-active ions and creates the proton channels via hydrophobic/hydrophilic phase separation. As a result, the composite membrane exhibits high conductivity, selectivity, and stability, especially with almost no swelling at high operating temperatures. Thus, an ICFB with the prepared membrane exhibits a coulombic efficiency of 93.29% at the current density of 80 mA cm−2and runs stably for over 300 cycles. This work provides an easy method to fabricate high-performance and low-cost membranes specifically for ICFBs and has the potential to promote the development of ICFBs.Keywords:iron–chromium flow battery;pore-filling Daramic membrane;ion selectivity;low cost;high stability
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Water Research & Technology
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2023
·Vol. 9
·期 9
·2323-2337
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IF 5
Md Eman Talukder,Fariya Alam,Md. Romon Talukder,Mst. Monira Rahman Mishu,Md. Nahid Pervez,Hongchen Song,Francesca Russo,Francesco Galiaono,Lan Jiabao,George K. Stylios,Alberto Figoli,Vincenzo Naddeo
This paper aims to establish a new sustainable membrane with antifouling properties by developing a structured porous membrane with a honeycomb-like surface fabricated by blending polymers and additives via immersion precipitation and using a thermally induced phase inversion method coupled with exposure time to vapor. The hydrophilic properties, surface charge, and pore size of the membrane were dependent on controlling the blending ratio of polyethersulfone (PES), polyethyleneimine (PEI), and polyvinylpyrrolidone (PVP). The properties of the membranes were characterized, including physical properties, morphology, contact angle, mechanical properties, porosity, and pore size distribution. The membrane filtration performance was evaluated by examining the water permeation, antifouling, and hydrophilic properties of the membranes. The hydrophilic nature of the PES/PEI membrane increased the filtration performance and created a smooth surface that exhibited excellent antifouling ability. Finally, the separation capability of the membranes was evaluated using bovine serum albumin (BSA) and Angelica gigas Nakai (AGN) root solutions. An almost 99.9% rejection rate was achieved for BSA and AGN at 1 bar pressure. The optimized membrane outperforms the commercial membrane with analogous characteristics on both the water flux and molecular weight cut-off (MWCO) of polyethylene glycol (PEG). Due to the controlled pore size (0.0032 to 0.0041 μm) of the honeycomb-like surface, it may be possible to separate pharmacodynamic macromolecules (such as berberine, baicalin, geniposide, and palmatine) for future applications.
研究领域:
材料科学
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生物工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
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2020
·
IF 3.204
Qiao-Mei Li,Hou-Ying Ma,Yi-Ning Hu,Yan-Feng Guo,Li-Jing Zhu,Zhi-Xiang Zeng,Gang Wang
The ultrafiltration membranes fabricated by the non-solvent induced phase separation (NIPS) have been widely used as the supports of the polyamide thin film composite (PA TFC) membranes, although they are usually thick, low porosity, and poor chemical stability. Instead, thin polyethylene (PE) lithium battery microporous membrane with high surface porosity and connected pores is used as the support layer. PE membrane was pre-modified by the co-deposition of tannin and 3-aminopropyltriethoxysilane improving its hydrophilicity, and then a uniform and defect-free PA active layer was successfully fabricated by interfacial polymerization. The resultant membrane exhibited high filtration performances in the forward osmosis (FO) process (2 times higher water flux and 90% lower specific salt flux than the commercial HTI-TFC membrane), and efficient separation of NaCl and dyes in nanofiltration (NF) process, outstanding chemical stability and mechanical strength.
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
DOI
高影响因子
POLYMERS & POLYMER COMPOSITES
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2015
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IF 0.271
Zhao-Cai Zhang,Chun-Gang Guo,Jing-Lie Lv
Poly(vinylidene fluoride) (PVDF) membrane was successfully prepared by PVDF/tributyl citrate (TBC) via thermally induced phase separation (TIPS). TBC was used as diluent for membrane preparation, which is citric acid esters non-toxic, non-odorous, easy to prepare and comparatively cheap. The effects of PVDF content on crystallinity of PVDF and porous structure were investigated by differential scanning calorimetry (DSC), scanning electron microscopy (SEM), mercury porosimetry and pore size analyzer instrument. The results showed that PVDF was most able to crystallize and the membrane pore size became more uniform and smaller at higher polymer content.
研究领域:
材料科学
·
膜技术
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2024
·
IF 6.8
Zhao Lu,Zhang Feng,Gao Shoujian,Jin Jian
Fabricating nanoporous membranes with superhydrophilic properties to overcome fouling from organic foulants is a challenge in membrane separation processes for organic molecules. Recently, researchers demonstrated that membranes with distinct hydrogel features exhibit superhydrophilicity and outstanding antifouling capacity. However, hydrogel membranes have low mechanical strength, which can lead to pore deformation and potential membrane rupture during pressure-driven separation processes. Herein, we report a whole-membrane crosslinking strategy to fabricate a superhydrophilic and robust nanoporous membrane in which polyethyleneimine is blended and crosslinked in a carboxylated polyacrylonitrile hydrogel membrane in situ . Whole-membrane crosslinking improves membrane strength, with crosslinking occurring both in the membrane interior and on the membrane surface. Efficient molecular separation with a water flux of 220 L m −2 h −1 bar −1 , a Coomassie brilliant blue (CBB) rejection of ∼99.9%, and a CBB/Na 2 SO 4 selectivity of 747 was achieved with this membrane. The membrane also showed excellent antifouling capacity, with a flux recovery of ∼100% during molecular separation with humic acid as a foulant. At transmembrane pressures up to 8 bar, the membrane exhibited stable molecular separation. Our work provides a new route for fabricating superhydrophilic nanoporous membranes for the separation of organic molecules in wastewater.
研究领域:
材料科学
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环境工程
·
膜技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hanjun Jiang,Haoming Wang,Zhouyi Zhu,Xianfu Chen,Minghui Qiu,Yiqun Fan
Potassium sodium niobates (KNNs) have garnered significant attention owing to their lead-free nature and potential for use in self-cleaning membranes. This paper presents the synthesis of (K 0.5 Na 0.5 )NbO 3 materials for the fabrication of porous membranes, which enable in situ ultrasonic resonance to effectively eliminate contaminants from the membrane surface . KNN powder was synthesized via solid-state reactions, and the membranes were prepared using conventional sintering techniques. The effects of ball-milling time and calcination temperature on the phase structure, pore size, permeance, flexural strength , chemical stability, and piezoelectric properties were comprehensively investigated. The optimal membranes exhibited an average pore size of approximately 300 nm, a porosity of 23 %, and permeance of 220 L m −2 h −1 bar −1 at a sintering temperature of 1050 °C. A polarized electrical field with a strength of 1 kV/mm was applied to the membranes, resulting in an ultrasonic response of 20 mV at an excitation voltage of 20 V with a frequency of 200 kHz. Furthermore, the in situ anti-fouling performance was evaluated by conducting filtration tests on a 500 ppm oil-in-water (O/W) emulsion, demonstrating that the stationary flux increased by 46.7 % when subjected to an excitation voltage of 60 V.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yan-nan Wang,Jin Li,Zhenyu Yuan,Fanli Meng
An optical fiber toluene gas sensor working at room temperature is proposed based on CQDs@SiO 2 (-OH) porous film. The CQDs@SiO 2 (-OH) porous film was elaborated on the surface of the hollow core fiber (HCF) using the templating method, where the evanescent field is excited by a misaligned structure. The precursor solution formed by mixing CQDs with SiO 2 (-OH) enhances CQDs dispersion within the film, preventing aggregation and preserving active sites. Experimental results indicate that the gas-sensitive layer doped with CQDs demonstrates a sensitivity of 5.1 pm/ppm to toluene gas at room temperature, which is approximately 3.13 times greater than that of the SiO 2 (-OH) porous film. Additionally, it demonstrates a response time of 12 s and a limit of detection (LOD) of 3.9 ppm. The gas sensing mechanism is thoroughly investigated using DFT, exploring the electronic distribution of the gas-sensitive layer before and after CQDs doping and analyzing the sensitization mechanism. This study presents a novel approach for toluene gas detection at room temperature using an optical fiber sensor.
研究领域:
化学传感器
·
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）