DESALINATION
·
2023
·
IF 9.9
Xinyu Fu,Jianqiang Wang,Yingyao He,Yanli Ji,Qiuyan Bi,Xiao Wang,Fu Liu
Thickness reduction of polyamide separation layer played an important role in permeability enhancement of thin film composite (TFC) nanofiltration membrane. However, the practical application of TFC nanofiltration membrane with ultrathin polyamide layer is still a great challenge. Herein, we proposed a strategy for preparing nanofiltration membrane with asymmetric polyamide dual-layer through interfacial polymerization . The top polyamide layer is thin, smooth and dense. The bottom polyamide layer is relatively thick, rough and porous. The thin and dense top polyamide layer enabled membrane with relatively high water permeability (18.5 ± 1 L m −2 h −1 bar −1 ) and Na 2 SO 4 rejection (97.2 ± 0.8 %) performance. The thick and porous bottom polyamide layer guaranteed membrane stability. This study offers a promising strategy for polyamide composite membrane fabrication with enhanced separation performance.
研究领域:
材料科学
·
膜分离技术
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产品关联
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Shiwei Guo,Bo Yuan,Jicheng Wu,Hao Wang,Jianquan Luo,Chungang Yuan
Interfacial polymerization (IP) plays a vital role in the manufacturing process of polyamide (PA) nanofiltration (NF), which is of great value in a wide variety of separation processes. In this study, we proposed a catalytic strategy to mix proton sponge/hexane solution and TMC/hexane solution during the interfacial polymerization reaction, thus achieving a facilitative modulating effect on the interfacial polymerization process. The nanofiltration membranes prepared by the catalytic strategy showed reduced thickness of the separation layer, reduced roughness, and more uniform pore size distribution than the blank membrane. As a result, the modified membranes showed nearly double permeate flux (from 8.0 to 15.9 Lm −2 h −1 bar −1 ) and slightly increased Na 2 SO 4 retention, as well as improved separation selectivity for monovalent/divalent salts and stronger antifouling ability. At the same time, this strategy also improved the uniformity of membrane pore size distribution while loosening the membrane structure. The illustrated strategy based on the catalytic modulation of interfacial polymerization by proton sponge achieved an enhancement of all aspects of nanofiltration membrane performance through such a simple step, showing good prospects for application in the manufacture of membrane for high performance nanofiltration.
研究领域:
材料科学
·
化学工程
·
环境工程
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产品关联
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Yongheng Yin,Yuemin Guang,Hongxiu Zhang,Qiying Xia,Chongbin Wang
The trade-off limit between permeability and selectivity , along with membrane fouling , has consistently posed significant challenges impeding the practical implementation of water purification membranes. In this paper, a combination of polyhedral oligomeric silsesquioxanes (POSS) and chitosan is introduced into the polyamide layer through interfacial polymerization and crosslinking to optimize the physical, chemical structure of membrane simultaneously. The resulting P/CS-2-POSS-2 membrane exhibits a notable water flux of 221.3 L m −2 h −1 MPa −1 and a substantial Na 2 SO 4 rejection of 97.1 %. The selectivity of water molecules over sulfates in the optimized hybrid membrane is approximately 4 times greater than that observed in the pristine polyamide membrane. This finding underscores the success of the developed method in mitigating the trade-off between permeability and selectivity. Furthermore, the hybrid membranes exhibit superior antifouling properties, as evidenced by an impressive flux recovery ratio of 95.8 % for bovine serum albumin. Additionally, the mass transport properties of the prepared membranes are explored via molecular dynamics (MD) simulations. The results highlight that chitosan primarily enhances the membrane's hydrophilicity , whereas POSS predominantly regulates the membrane's pore size. Both fillers synergistically enhance the comprehensive performance of the membrane by effectively utilizing steric hindrance and the Donnan effect .
研究领域:
材料科学
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环境工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qian Wang,Xin Wei,Guang-Rui Wang,Tian-Dan Lu,Qixun Shi,Shi-Peng Sun
This study aims to develop an inner selective coordination nanofiltration hollow fiber (CNHF) membrane for the efficient removal of antibiotics from groundwater. In the first step, a modified substrate with the controlled modification degree is achieved by pressure-assisted alkali modification of polyimide hollow fiber substrate to provide the active points for the construction of the dense active layer. Then, the high-performance active layer is dynamically built on the modified substrate by the coordination between Fe 3+ and phytic acid. Compared to static synthesis, the pure water permeability (PWP) of the membrane is improved from 4.1 to 8.5 Lm −2 h −1 bar −1 and Na 2 SO 4 rejection enhanced from 68.3% to 97.0% by the dynamic synthesis with a cross-flow system. The newly developed membranes exhibit high rejection to several pharmaceuticals (>99%). This work may provide insightful guidelines for improving the fabrication procedures and scaling up the inner-selective CNHF membrane modules for water purification and other applications.
研究领域:
环境工程
·
膜科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Qiu-Yu Zhu,Liu-Kun Wu,Lan-Qian Li,Li-Wei Zhuang,Shuang-Mei Xue,Zhen-Liang Xu,Yong-Jian Tang
The monomer concentration is a key factor affecting the diffusion rate and reaction rate of the monomers and determines the physicochemical property of polyamide nanofiltration membranes. However, the mechanism of the monomer concentration effect on the polyamide nanofiltration membrane remains unclear. The properties of nascent membranes fabricated with different monomer concentrations with a fixed ratio presented completely new results in the absence of heat treatment. The results reveal that the polyamide layer thickness increases linearly with the monomer concentration when the concentration is high. The nanofiltration membranes prepared at a low concentration have a larger pore size and a lower cross-linking degree, which contributed to high water permeability. The optimal membrane presented a high pure water permeability of 36.1 L h–1 m–2 bar–1, with the Na2SO4 rejection maintained at 98.4%. This work provides a novel insight into the relationship between the properties of the nanofiltration membrane and monomer concentration.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Cunxian Lai,Xuewu Zhu,Jinyu Li,Weiwei Zhou,Jingtao Xu,Junwen Ding,Jialin Song,Daoji Wu,Heng Liang,Xiaoxiang Cheng
Highly permeable nanofiltration (NF) membranes with efficient natural organic matter (NOM) removal yet preserving essential minerals are of great significance for purifying ground water. In this work, a novel pH-regulated interfacial polymerization (PRIP) strategy was proposed to fabricate ultra-low pressure NF membranes. This strategy was achieved by changing the aqueous solution pH (5, 7, 9, and 11) during IP process. The effects of pH-regulated processes on the structure, chargeability, and physicochemical properties of NF membranes were systematically investigated. Tailored NF membranes under acidic conditions (TFC-pH 5) achieved the ultrahigh permeability of 42.9 L m −2 h −1 bar −1 and 83.3 % moderate rejection of Na 2 SO 4 . For the NF membranes prepared under alkaline conditions (TFC-pH 11), the sieving capacity was obviously improved with fewer defects, and 99.4 % rejection of Na 2 SO 4 was observed. In addition, the purification performance of NF membranes in ground water treatment was further studied. Modified NF membranes showed significant removal of NOM and retain moderate amounts of mineral salts. Finally, the mechanism of the pH-regulated influence on the polyamide active layer formation process was proposed. This study provides a feasible and facile design idea for ultralow-pressure NF membranes in purifying ground water.
研究领域:
环境科学
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材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
npj Clean Water
·
2024
·Vol. 7
·期 1
·1-14
·
IF 10.4
Meng Wenqiao,Xue Qiang,Zhu Jinyuan,Zhang Kaisong
Incorporating hydrophilic and charged porous nanofillers to prepare high-performance thin film nanocomposite (TFN) nanofiltration (NF) membranes is an effective method to achieve efficient water treatment. In this study, we synthesize the sulfonated covalent organic framework nanosheets (S-CONs) with higher hydrophilicity and electronegativity by immobilizing sulfonic acid groups (–SO 3 H) on TpPa-1 nanosheets. The S-CONs are incorporated in the PA layer by interfacial polymerization (IP) reaction. The results indicated that the S-CONs could modulate the hydrophilicity, thickness, and electronegativity of TFN-NF membranes. At the optimal addition of S-CONs (0.006 g), the pure water permeance increases to 8.84 \({\rm{L}}\cdot{\rm{m}}^{-2}\cdot{\rm{h}}^{-1}\cdot{\rm{bar}}^{-1}\) , which is about 1.75 times than the TFC membrane, with a high Na 2 SO 4 rejection reaching 98.97%. The improvement of the separation performance mainly results from the reduction of PA layer thickness (from ~178.00–198.00 to ~100.00–128.00 nm) and the increase of surface electronegativity (from −20.37 to −44.41 mV at pH = 7.00). More interestingly, the amide bond formed between the S-CONs and TMC improved the chlorine resistance of the membranes. This study reveals the potential of using functionalized 2D CONs as nanofillers to modify TFC membranes for efficient nanofiltration.
研究领域:
材料科学
·
环境工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Hengrao Liu,Jing Gao,Guanhua Liu,Miyu Zhang,Yanjun Jiang
Thin film nanocomposite (TFN) membranes were invented in 2007 to enhance the permeability of thin film composite (TFC) membranes. Surface modification of nanofillers was a common method to improve the interaction and compatibility at polymer/nanofiller interfaces. Accordingly, as an amino-functionalized zirconium-based metal–organic framework (MOF), UiO-66-NH2 was synthesized and introduced into the preparation of TFN membranes via interfacial polymerization in this study. The superhydrophilic characteristic of UiO-66-NH2 made it possible to be well dispersed in aqueous solution and the amino groups on particle surfaces could react with 1,3,5-benzenetricarboxylic acid chloride (TMC) to form covalent interaction with polymer thus inhibiting the formation of nonselective defects at PA/nanofiller interfaces. The morphology images and FT-IR spectra revealed the PA selective layer successfully formed on the top of hydrolyzed polyacrylonitrile (HPAN) supports. The EDX characterization demonstrated UiO-66-NH2 nanoparticles were successfully introduced into the TFN membranes. The UiO-66-NH2 nanoparticles increased the surface hydrophilicity and roughness of the membranes, and provided additional passageways for mass transfer. Pure water permeability increased from 6.89 LMH/bar for TFC membrane to 14.55 LMH/bar for TFN-0.10 membrane indicating the distinct permeability elevation after the incorporation of UiO-66-NH2 nanoparticles. And the Na2SO4 rejection of TFN-0.10 membrane was up to about 99.0% and NaCl rejection was 38.1% at 4 bar, which was higher than that of TFN membrane incorporated with pristine UiO-66.
研究领域:
材料科学
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化学工程
·
膜技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yang Cao,Yinhua Wan,Chulong Chen,Jianquan Luo
Nanofiltration (NF) is considered a competitive technique for acidic stream treatments. However, poorly reactive acid-resistant monomers normally cause thick and uneven separation layers with ultra-low permeability. Herein, catalyst-anchored secondary polymerization is employed after the interfacial polymerization (IP) reaction between trimesoyl chloride (TMC) and 3-aminobenzenesulfonamide (ABSA) to fabricate an extremely acid-resistant NF membrane. Acylation catalysts in ethanol are grafted on the nascent layer by reacting with residual acyl chloride groups to enhance the monomer reactivity, while the ethanol-induced nascent layer structure regulation greatly improves the surface uniformity. Benefiting from the improved self-inhibition effect and optimized phase integrity of the modified IP process, the resulting acid-resistant membrane has unprecedented water permeance (up to 31.4 Lm −2 h −1 bar −1 ), desirable Na 2 SO 4 rejection (92.8%), high dye/H + selectivity and impressive acid stability (20 wt% of H 2 SO 4 for 50 days), outperforming almost all advanced acid-resistant NF membranes. Our work provides a versatile approach for the synthesis of high-performance specialty membranes.
研究领域:
材料科学
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化学工程
·
膜技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qiang Xue,Kaisong Zhang
Current membranes have limitations in permeability and selectivity, and require long-time stability, which drive the development of high-performance nanofiltration (NF) membranes. MXene is a new type of highly hydrophilic and negatively charged two-dimensional (2D) nanosheets material, especially its supernatant has good dispersibility and stability. The MXene supernatant containing several layers was treated as aqueous solvent for interfacial polymerization, consequently the prepared MXene nanocomposite membrane could maintain high permeselectivity even under low pressures required for low carbon. The characterization results showed that the MXene nanocomposite membrane had better hydrophilicity and higher negative charge. At the same time, the Na 2 SO 4 rejection was increased to 97.6% and the pure water flux was improved by about 1.7 times compared with the pristine membrane. In the BSA antifouling test and 58-day persistent desalination test, the MXene nanocomposite membrane showed the better antifouling property, high rejection and good stability. As an excellent 2D modifier, MXene provided fresh ideas and guidance for low-carbon and persistent NF membranes with excellent separation performance.
研究领域:
材料科学
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环境工程
·
纳米技术
·
水处理
✓ 已验证
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Zhiwen Li,Yanchao Xu,Liguo Shen,Renjie Li,Yang Jiao,Hongjun Lin,Chuyang Y. Tang
Nano-wrinkled morphology and ultrathin thickness are desirable membrane structures in polyamide membranes, particularly for high-performance applications in desalination and wastewater treatment . In this study, we present the fabrication of a nano-wrinkled polyamide membrane with ultrathin thickness on a heterogeneous surface that features hydrophilic UiO-66-NH 2 nanoparticles embedded on a hydrophobic polyethersulfone surface using a heterogeneous surface regulated interfacial polymerization approach. The presence of the heterogeneous surface induces the formation of aqueous phase microphases under the organic phase due to the unbalanced interfacial tension, which serves as a template for the formation of the polyamide film. This results in the creation of a nano-wrinkled polyamide layer upon drying. Furthermore, the hydrogen bonding interaction between the UiO-66-NH 2 and piperazine (PIP) slows down the PIP release, which contributes to the ultrathin thickness of the polyamide layer. The polyamide membrane obtained in this study exhibits a pure water permeance (PWP) of 26.1 L bar −1 ·h −1 ·m −2 and a Na 2 SO 4 rejection of 97.5 %. The PWP is 6.15 times higher than that of a control membrane fabricated through conventional interfacial polymerization. Our work offers a novel approach to tailor the structure of polyamide membranes via heterogeneous surface regulated interfacial polymerization, which has potential applications in environmental desalination.
研究领域:
材料科学
·
环境工程
·
膜技术
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Chuanfeng Wang,Yingbo Chen,Xiaoyu Hu,Pengfei Guo
A novel defect-free polyamide/(polyether sulfone/poly(vinylidene fluoride)) PA/(PES/PVDF) thin-film composite (TFC) hollow fiber membrane (HFM) with desirable separation characteristics were developed through a facile and scalable coating procedure. By the introduction of piperazine (PIP) monomers into the PES coating solutions, the functional monomer-enriched PES coating layer was formed on the shell side of porous matrix-reinforced hollow fiber (HF) support through phase inversion process. Subsequently, PIP and TMC was interfacial polymerized during the fiber coating line to form a thin and defect-free polyamide (PA) functional layer for TFC HFM with high water permeability. Furthermore, the introduction of aqueous monomers only into the PES layer allowed economizing the cost of membrane manufacturing compared with bulk modification of the membrane substrate. Interestingly, the formation of bowl-like structures endowed the separation layer with higher permeation surface area and thus favored high water permeability. On combining these separation features, the optimized TFC membranes presented a high pure water permeability (PWP) of 13.8 L·m −2 ·h −1 ·bar −1 , approximately twice than that of conventional TFC membrane, with a satisfying Na 2 SO 4 rejection of 98.2%. Moreover, the PA/(PES/PVDF) TFC HFM exhibited excellent stability, backwash ability and anti-fouling ability, suggesting its huge potential for the water purification . Compared with the conventional two-step IP process on flat sheet membrane , the in-situ IP procedure performed on HF greatly simplifies the manufacturing process , shortens the production period and reduces monomer usage while the high packing density and great surface area per unit volume are obtained. This work may provide a simple and economical strategy for engineering high-performance TFC HFM.
研究领域:
材料科学
·
化学工程
·
环境工程
·
膜技术
✓ 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）