SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Antuo Wang,Xianglong Li,Teng Hou,Yishen Lu,Jing Zhou,Xianggui Zhang,Bin Yang
Recently, the membranes with durable and highly efficient separation performances for the purification of oil/water emulsions have drawn wide concern due to the great potential application in solving the problem of offshore oil spill and the discharge of oily wastewater. However, the crucial issues of low-permeability and severe membrane fouling seriously affect their application. Herein, we created an ultrafine tree-grapes-like poly(tetrafluoroethylene) (PTFE) fibrous membrane (UTPFM), which aimed to provide a fibrous membrane with ultrahigh permeability and separation efficiency. The fibrous membrane with regular grapes on fiber surface was fabricated by sintering electro-centrifugal spinning ultrafine fibrous poly(vinylpyrrolidone) (PVP)/PTFE membranes. The size and number of grapes could be simply controlled by the PVP/PTFE ratios, and brought water contact angle (WCA) of obtained fibrous membrane up to 154.6°. As a result, the obtained fibrous membrane presented ultrahigh permeability up to 3200 L m -2 h −1 and high separation efficiency more than 99%. Moreover, the grape structures on fiber surface were demonstrated to bring without any changes after 1000 cycles of abrasion. Therefore, the obtained membrane exhibits a great potential application in the long-term, stable and efficient oily wastewater separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
·
IF 7.183
Xue-Li Cao,Fu-Yi Zhou,Jing Cai,Yi Zhao,Mei-Ling Liu,Longwei Xu,Shi-Peng Sun
Aiming at the two challenging bottlenecks of “trade-off effect” and “membrane fouling” that limit the development of nanofiltration (NF) membranes, this work developed a high-performance NF membrane based on the modification by an asymmetric hydrophilic zoledronic acid (ZA). ZA plays multiple roles: (1) the self-restrictive diffusion effect of piperazine (PIP)/ZA obtained from the reaction of PIP and ZA resulted in smooth membrane surface; (2) the imidazolyl on ZA uninvolved in interfacial polymerization (IP) led to enlarged polyamide network pores and provided more solvent tunnels; (3) all groups of ZA improved the membrane hydrophilicity; (4) the electronegative phosphate groups made a significant contribution to the strong membrane surface electronegativity. As a result, the ZA-modified membrane exhibited nearly five times higher permeability than that of traditional NF membranes, accompanied by perfect selectivity of SO 4 2− and Cl − as well as the outstanding anti-fouling property, indicating its enormous application prospect in water treatment.
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
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Ke Liu,Nian Liu,Siqi Ma,Pan Cheng,Wei Hu,Xiaodan Jia,Qin Cheng,Jia Xu,Qihao Guo,Dong Wang
For energy-saving purposes, the pursuit of ultrahigh permeance nanofiltration membranes without sacrificing selectivity is never-ending in desalination, wastewater treatment, and industrial product separation. Herein, we reported a novel facile route to engineer a highly porous and superhydrophilic nanofibrous substrate to mediate the interfacial polymerization between trimesoyl chloride and piperazine, generating an ultrathin PA active layer (∼13 nm) with a hierarchical crumpled surface. The wet laying process and subsequent plasma treatment endowed a rougher and more hydrophilic surface for ethylene vinyl alcohol copolymer (EVOH) nanofibers in the thin compact nanofibrous scaffold (∼9 μm) with a mean pore size of 210 nm, radically different from the nanofibrous membrane by other methods. Nanofibrous scaffold with these features provide abundant thin–thick alternative continuous water layers between nanofibers and organic phase, facilitating the formation of the abovementioned PA layer. As a result, an ultrahigh permeance of 42.25 L·m–2 h–1 bar–1 and a reasonably high rejection of 95.97% to 1000 ppm Na2SO4 feed solution were obtained, superior to most state-of-the-art NF membranes reported so far. Our work provides an easy and scalable method to fabricate advanced PA NF membranes with outstanding performance, highlighting its great potential in liquid separation.
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
✓ 已验证
DOI
高影响因子
Advanced Membranes
·
2024
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IF 0
Yuhao Chen,Xun Zhou,Tengfang Zhang,Baosheng Ge,Q. Jason Niu,Haixiang Sun
Covalent organic polymers (COPs) membranes have been widely investigated in recent years for the application and preparation of composite nanofiltration (NF) membranes due to the abundant pore structure. However, there are still difficulties in the easy and reliable preparation of scalable and highly permeable COPs membranes. In this work, the polyaminophenylene (PAP) layer was constructed on polysulfone (PSF) ultrafiltration membranes by diazonium-induced anchoring process (DIAP), and then used as a substrate to prepare ultra-thin and highly permeable COPs NF membranes by interfacial polymerization (IP) in only 20 s. The presence of PAP layer increases the aqueous phase monomer storage to promote the forward progression and limits the reaction zone of IP, thus resulting in ultrathin and highly crosslinked COPs membranes. In addition, the PAP layer covalently grafted onto the PSF molecular chain also participates in the IP reaction, thus the separation layer is connected to the substrate as a whole for better stability and can operate for long periods of time in an alcohol-based organic solvent environment. The methanol permeance of optimal NF-PAP membrane prepared based on the above strategy can reach 362-398 L −1 m −2 h −1 bar −1 , which almost achieves an order of magnitude enhancement relative to other reported COPs organic solvent nanofiltration (OSN) membranes. The retention rate of the COPs composite membrane for naphthol green B (Mw = 878) dye was about 98.5 %, demonstrating good alcohol recovery ability. In conclusion, this study offers a potential strategy for the development and application of COPs OSN membranes.
研究领域:
膜科学
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高分子化学
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分离技术
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材料科学
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化学工程
✓ 已验证
DOI
Small
·
2024
·Vol. 20
·期 29
·2310092
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IF 13
Yu-Ren Xue,Chang Liu,Hao-Cheng Yang,Hong-Qing Liang,Chao Zhang,Zhi-Kang Xu
Supported ionic liquid membranes (SILMs), owing to their capacities in harnessing physicochemical properties of ionic liquid for exceptional CO 2 solubility, have emerged as a promising platform for CO 2 extraction. Despite great achievements, existing SILMs suffer from poor structural and performance stability under high-pressure or long-term operations, significantly limiting their applications. Herein, a one-step and in situ interfacial polymerization strategy is proposed to elaborate a thin, mechanically-robust, and highly-permeable polyamide armor on the SILMs to effectively protect ionic liquid within porous supports, allowing for intensifying the overall stability of SILMs without compromising CO 2 separation performance. The armored SILMs have a profound increase of breakthrough pressure by 105% compared to conventional counterparts without armor, and display high and stable operating pressure exceeding that of most SILMs previously reported. It is further demonstrated that the armored SILMs exhibit ultrahigh ideal CO 2 /N 2 selectivity of about 200 and excellent CO 2 permeation of 78 barrers upon over 150 h operation, as opposed to the full failure of CO 2 separation performance within 36 h using conventional SILMs. The design concept of armor provides a flexible and additional dimension in developing high-performance and durable SILMs, pushing the practical application of ionic liquids in separation processes.
研究领域:
膜科学与技术
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气体分离
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环境化学
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材料化学
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化学工程
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可持续能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Bin Xiang,Jingling Gong,Yuqing Sun,Wenhao Yan,Ruirui Jin,Jian Li
Unstable interlayer spacing of lamellar membranes would be rapidly compressed and narrowed under normal high flowrates and concentration polarization effect contributes to reduced permeation and fouling resistance. Herein, a large permeability PEG/MXene@MOF membrane with stable interlayer spacing and superior antifouling property was created via facile interface self-assembly strategy. Metal-organic framework ( MOF , UiO-66-NH 2 ) nanoparticles as supports constructed an intercalation-induced structure with hierarchical Ti 3 C 2 T x (MXene) nanosheets , which effectively regulated the interlayer spacing and improved permeability. Hydrophilic polyethylene glycol (PEG) further enhanced the stability of intercalation structure via hydrogen bonding , so that the PEG/MXene@MOF membrane demonstrated excellent swelling resistance with an average layer spacing expansion of only 0.05 nm even after immersion in water for 8 days. Moreover, MOF particles increased the lamellar roughness and interlayer water retention capacity, resulting in the PEG/MXene@MOF membrane with remarkable separation selectivity and powerful fouling resistance (UWOCA >156°, UWOSA <5.5°). Regarding the purification of oil-in-water emulsions stabilized by surfactants , the PEG/MXene@MOF membrane exhibited extremely stable high permeability (1246 ± 12 L m −2 h −1 bar −1 ) and excellent efficiency (>99.7 %), even during continuous separation of high-viscosity crude oil emulsions for 60 min. In addition, the PEG/MXene@MOF membrane also exhibited superior chemical durability and mechanical robustness in strong-corrosiveness and high-salty environments (72 h), ultrasonic treatments (120 min), bending experiments (100 times) and abrasion tests (20 times). Therefore, this work provided a promising strategy to construct highly permeable membrane with stable interlayer spacing and efficient fouling resistance for practical oily wastewater purification.
研究领域:
膜技术
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水处理
·
纳米材料
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环境工程
·
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）