Desalination and Water Treatment
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2024
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IF 1
Ye Zhao,Lei Chen,Yuan Zuo,Baiyan Zhu,Xueli Liu,Yujin Jia
Polyacrylonitrile (PAN) has attracted obvious attention from research professionals due to its chemical and thermal stability. To further enhance the PAN membrane performance, it becomes crucial to optimize the film forming conditions. This study aims to determine whether hexagonal boron nitride (h-BN) can be used to boost the PAN ultrafiltration (UF) membranes performance. The nonsolvent induced phase inversion process (NIPS) approach was employed to manufacture PAN nanocomposite ultrafiltration membranes. The prepared PAN membranes with different h-BN loadings were characterized via morphological, wetting, water transport properties and so on. Based on the hydrophilicity test results, the optimized B-0.8 membrane had a water contact angle of 42°, suggesting its good hydrophilicity. The B-0.8 UF membrane exhibited improved water permeability (from 174.5 to 234.4 L m −2 h −1 bar −1 ), enhancing the removal capacity of dyes (from 68.7 % to 99.3 % for CR and from 94.1 % to 99.3 % for CB-G-250), and a remarkable 99.0 % BSA rejection. Moreover, these characteristics render the PAN nanocomposite UF membrane with considerable potential for the decontamination of dye wastewater.
研究领域:
环境工程
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材料科学
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膜技术
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水处理
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yuehao Wen,Jingquan Wang,Jianfei Zhou,Hongguang Guo
The assembly of metal ions and phenols has been widely exploited for surface modification of materials. In this work, polyamide (PA) composite nanofiltration membranes with different types of tannic acid-metal (TA/M n+ ) interlayers were fabricated. TA/transition metal interlayers endowed the PA composite membranes with enhanced water permeability and improved separation of antibiotics from NaCl. Among various TA/M n+ -PA membranes, TA/Al 3+ -PA membrane possessed increased pore size, augmented surface roughness, and reduced negative potential, exhibiting the most outstanding performance with a high-water flux of 8.94 L·m −2 ·h −1 ·bar −1 (429 % enhancement compared to PA membrane) and an excellent selective factor of 9.75 (589 % improvement over the PA membrane) for ciprofloxacin (CIP) and NaCl, successfully breaking the trade-off between permeability and selectivity. Moreover, this membrane displayed 89.92 % Na 2 SO 4 rejection and 94.10 % CIP rejection in the CIP/Na 2 SO 4 mixture. In addition, the TA/M n+ -PA membranes presented superior anti-fouling ability compared to the PA membrane. This study aims to explore the effects of different TA-metal interlayers on the performance of PA composite membranes and the underlying mechanisms, thereby offering more effective guidance for the application of such interlayered composite membranes.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Linhan Ni,Min Li,Xin Guo,Minjie Song,Jia Xie,Yue Yang,Yujun Zhou,Zhigao Zhu,Junwen Qi,Jiansheng Li
Incorporation of nanosized metal organic frameworks (MOFs) fillers into polyamide layer can essentially enhance the performance of thin film nanocomposite (TFN). However, in situ growth of MOFs during interfacial polymerization (IP) is impeded by the insolubility of metal precursors in alkaline aqueous solutions. Herein, 1,4,7,10-tetraazacyclododecane (Cyclen), a macrocyclic polyamine capable of complexing metal ions, was integrated into the IP process to fabricate TFN membranes with in situ synthesized zeolitic imidazolate framework-8 (ZIF-8). Compared to the conventional piperazine-trimesoyl chloride (PIP-TMC) membrane, the modified PIP + Cyclen-TMC membrane features a thinner and denser polyamide layer. After the incorporation of ZIF-8, the polyamide layer becomes looser, more hydrophilic and electronegative. The resultant TFN membranes demonstrated exceptional water permeance (31.4 L m −2 h −1 bar −1 ) and improved selectivity (96.3 %), signifying a permeance enhancement of 182.6 % compared with that of the pristine PIP-TMC membrane. Additionally, the optimized membrane manifested enhanced fouling resistance and long-term stability. This macrocyclic polyamines mediated in situ growth technique can be extended to other combinations of macrocyclic polyamines and metal precursors, offering a novel paradigm for the fabrication of TFN-MOFs membranes for desalination.
研究领域:
材料科学
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化学工程
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膜技术
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Leiming Guo,Yazhi Yang,Yong Wang
Ultrafiltration membranes with relatively small pores are highly expected in various separation cases. As a flexible manner to efficiently tighten the pores, post modification provides a robust platform for preparing the desired membranes. However, the endeavor to pursue high permselectivity of the membranes has been made by paying close attention to the modification layers while the effects of the substrate membranes are generally overlooked. In this work, tight membranes with ultrahigh permeance were produced by coating polyethylenimine (PEI) on gradient nanoporous phenolic substrates. Cationic PEI was tightly deposited on the negatively charged phenolics via electrostatic deposition, thus reducing the effective pore sizes to ∼2.6 nm through a single-step coating. The gradient porous nanostructures still remained after PEI coating in the phenolic membranes. The coated membranes exhibited ∼4–45 times higher permeance than counterparts with similar rejections. As the cationic PEI was distributed on the membrane surface and pore wall after coating, the positively charged membranes thus produced were able to efficiently separate cationic dyes from water.
研究领域:
材料科学
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化学工程
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膜技术
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Xuewu Zhu,Zhongyue Sun,Fengxun Tan,Jianjun Zhu,Feiyong Chen,Sisi Xu,Daoji Wu,Daliang Xu,Heng Liang,Xiaoxiang Cheng
Polyester (PE) membranes with outstanding permeance and efficient dye desalination performance have become ideal for resource recovery from dye wastewater. However, further improving the performance of PE membranes remains challenging. Herein, a novel high-performance PE loose nanofiltration (LNF) membrane was fabricated via interfacial polymerization, in which nontoxic, rich in hydroxyl, large size, inexpensive, low reactivity, and biodegradable xylitol (XL) was utilized to fabricate PE films. The newly formed XL-based membrane had a hydrophilic, negatively charged, smooth, loose, and thin selective layer. The membrane was optimized by controlling the XL concentrations in the aqueous phase (0.5–2.5 wt%). The optimized membrane (XL-1.5/TMC) exhibited unprecedented water permeance (97.6 L m −2 h −1 bar −1 ) and satisfactory dye desalination performance (Congo red/Na 2 SO 4 selectivity of 259). In addition, the XL-1.5/TMC membrane showed outstanding antifouling performance and stability, which showed great potential for the large-scale application of XL-based membranes. Therefore, this new strategy for the fabrication of PE LNF membranes featuring superior performance using XL was proposed to facilitate resource recovery from dye wastewater.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2022
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IF 11.357
Li Long,Chenyue Wu,Zhe Yang,Chuyang Y. Tang
Interlayered thin-film nanocomposite (TFNi) membranes have been shown to achieve enhanced water permeance as a result of the gutter effect. Nevertheless, some studies report impaired separation performance after the inclusion of an interlayer. In this study, we resolve the competing mechanisms of water transport in the transverse direction vs that in the normal direction. To enable easy comparison, carbon nanotube (CNT)-incorporated TFNi membranes with an identical polyamide rejection layer but different interlayer thicknesses were investigated. While increasing the thickness of the CNT interlayer facilitates water transport in the transverse direction (therefore improving the gutter effect), it simultaneously increases its hydraulic resistance in the normal direction. An optimal water permeance of 13.0 ± 0.7 L m–2 h–1 bar–1, which was more than doubled over the control membrane of 6.1 ± 0.7 L m–2 h–1 bar–1, was realized at a moderate interlayer thickness, resulting from the trade-off between these two competing mechanisms. In this study, we demonstrate reduced membrane fouling and improved fouling reversibility for a TFNi membrane over its control without an interlayer, which can be attributed to its more uniform water flux distribution. The fundamental mechanisms revealed in this study lay a solid foundation for the future development of TFNi membranes toward enhanced separation properties and antifouling ability.
研究领域:
材料科学
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环境工程
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DOI
PubMed
高影响因子
DESALINATION
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2026
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IF 9.9
Huan Qin,Fei Guo,Shiyu Xiao,Xiaobin Jiang,Xiaoming Yan,Gaohong He,Jianquan Luo,Xuehua Ruan
Coordination-induced reconstruction enables high-flux PU NF membranes. • Zr 4+ selectively disrupts hydrogen-bonding networks in PU layer. • Spatial reconstruction creates free volume while preserving selectivity. • 21% higher permeance with >95% rejection under acidic conditions. • Decouples permeability–stability trade-off via simple post-modification. Polyurea membranes exhibit exceptional acid-base tolerance due to their densely cross-linked structure and extensive hydrogen-bonding network, making them attractive for separations under extreme pH conditions. However, the tightly associated network also leads to limited free volume, resulting in low water permeability that hinders practical applications. Herein, we report a permeance-enhanced polyurea nanofiltration membrane fabricated via coordination-induced structural reconstruction. By introducing Zr 4+ into the polyurea network, coordination interactions with urea groups partially disrupt interchain hydrogen bonding, leading to network loosening and additional free volume. As a result, the water permeance is increased by 21% without compromising selectivity. Meanwhile, incorporation of Zr 4+ enhances membrane hydrophilicity and surface positive charge, which therefore improves antifouling properties and promotes the rejection of heavy metal ions. Importantly, the reconstructed membrane retains excellent acid resistance, maintaining a stable salt rejection above 95% over 720 h. This work provides a simple yet effective strategy to overcome the permeability-stability trade-off in polyurea membranes and offers new insights into coordination-mediated regulation of polymer network structures for high-performance separations under harsh conditions. Download: Download high-res image (175KB) Download: Download full-size image
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2026
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IF 7.9
Shihao Bai,Weijiao Jiang,Jingke Pei,Zhihui Xie,Jian Kang,Ming Xiang,Yue Zhang,Lu Li
High-permeance nanofiltration (NF) membranes with efficient sulfate separation are highly desirable for water purification and ion separation, but their performance is often constrained by the insufficient control of polyamide (PA) formation during interfacial polymerization. Herein, a copper–ionic liquid complex interlayer was constructed in situ on a polysulfone substrate through a coordination-assisted assembly strategy to regulate PA formation and improve NF separation performance. The introduction of the Cu-IL interlayer altered the interfacial polymerization environment, leading to the formation of a thinner and smoother PA selective layer with a modified surface elemental composition. Compared with the pristine NF membrane, the optimized NF/Cu-IL-2 membrane exhibited a reduced PA-layer thickness from 114 to 75 nm, a decreased surface roughness from 9.1 to 7.1 nm, and a lower O/N ratio from 1.22 to 1.13. Benefiting from the reduced transport resistance and improved water affinity, NF/Cu-IL-2 achieved a water permeance of 15.8 L m -2 h -1 bar -1 , which was 85% higher than that of the pristine NF membrane, while maintaining a Na 2 SO 4 rejection above 97%. Notably, the effect of Cu-IL loading was non-monotonic, and further increasing the interlayer loading did not continuously reduce the PA-layer thickness or improve water permeance, indicating the existence of an appropriate Cu-IL loading range. Moreover, NF/Cu-IL-2 maintained relatively stable water permeance and Na 2 SO 4 rejection during a continuous 144 h filtration test under the tested chlorine-free conditions. These results demonstrate that coordination-assisted Cu-IL interlayer engineering is an effective strategy for improving water transport while maintaining sulfate rejection under the investigated single-salt conditions.
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2026
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IF 8.8
Jiaye Cai,Yuxin Yang,Huawen Peng,Qiang Zhao
Acid-resistant nanofiltration membranes are crucial for recovering valuable metal ions from acidic wastewaters, yet conventional nanofiltration membranes predominantly consist of polyamide networks that degrade in concentrated acids. Poly(quaternary ammonium) (PQA) membranes exhibit high acid stability, but are compromised by slow formation kinetics and low permeance. In this work, we designed an oligomer (PVI, M n = 2342 Da, Đ = 1.18) bearing imidazole-based tertiary amines to undergo rapid interfacial polymerization with 1, 3, 5-tris(bromomethyl)benzene. PVI possesses high density of reactive groups with low steric hindrance, enabling the fabrication of a dense PQA membrane within sub-minute time. The resulting membrane exhibits a larger pore size and a more positively charged surface compared to conventional analogues, achieving a combination of ultrafast preparation (∼1 min), high water permeance (∼8.6 L m −2 h −1 bar −1 ) and rejection (∼96%). Meanwhile, the membrane shows high selectivity (>20) for Li + over Co 2+ , Ni 2+ , Mn 2+ , along with high acid stability in 1 M H 2 SO 4 for over one month, holding promise for lithium recovery from spent batteries leachates.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Xiaolei Wang,Haomiao Liang,Lei Wang,Bing Zhang,Chan Huang,Huan Zhang,Huicai Wang,Zhiyun Kong
A gel organic solvent nanofiltration (OSN) membrane with high permeance was prepared using calcium alginate (CaAlg) as the substrate membrane and tannic acid/copper ion (TA/Cu 2+ ) complexes as the selective layer. The gel OSN membrane was characterized with respect to the chemical properties, microstructure and tensile properties. The preparation conditions and separation factors affecting dye/ethanol separation were investigated. In addition, the long-term solvent resistance was evaluated. The results demonstrate that the TA/Cu 2+ selective layer causes the pore size of the gel membrane to decrease significantly from 2.85 nm of the substrate membrane to 0.79 nm. Consequently, the rejection of anionic dyes (congo red, reactive red 2, and acid chrome blue K) exceeds 95.0 %, and the ethanol permeance is greater than 19 L·m −2 ·h −1 ·bar −1 . Furthermore, the separation performance of the gel OSN membrane is hardly affected by the dye concentration (25–100 mg/L) and transmembrane pressure (1–5 bar). Even following a 60-day immersion in the aprotic polar solvent N, N-dimethylformamide (DMF), the gel OSN membrane can still ensure a 96.0 % rejection for congo red, demonstrating its stable separation performance in organic solvents.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
Desalination and Water Treatment
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2025
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IF 1
Senhao Wen,Yefei Tian
Confronting the escalating global issue of water pollution, membrane separation technology is regarded as one of the most effective methods for wastewater treatment due to its energy-saving potential, high separation efficiency, and environmental friendliness. Covalent organic frameworks (COFs) present unique advantages in the field of membrane separation technology owing to their high specific surface area and tunable pore size. In this study, a new type of triazine-based COF (BTA-TAPT-COF) membrane is synthesized by using 1,3,5-tris-(4-aminophenyl) triazine and 1,3,5-tricarbaldehyde via a room-temperature interfacial polymerization. The porous and crystalline thin membrane exhibits a continuous and dense surface morphology and multi-layer cross-section structure. The BTA-TAPT-COF membrane showed a relatively high rejection rate of 98 % for acidic fuchsin, 92 % for malachite green, and 91 % for Congo red, respectively. The permeance of BTA-TAPT-COF membrane to acetonitrile can be up to 816 L m −2 h −1 bar −1 , and the permeance to ethanol is 647 L m −2 h −1 bar −1 . In the continuous separation test, the rejection rate of the prepared BTA-TAPT-COF membrane can be recovered up to 90 %. These findings provide new strategies for the development of high-permeance triazine covalent organic framework membranes.
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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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Lina Jiang,Yanan Ding,Aimei Zhu,Qiugen Zhang,Qinglin Liu
Nanofiltration (NF) membranes are widely used in many fields, including food, petrochemical and brackish water desalination. One of the challenges for preparing NF membranes is to make NF membranes with high both permeability and selectivity because of the “trade-off" effect. To weaken or break through the “trade-off" effect, the thin film composite (TFC) NF membranes with high permeability and selectivity were prepared by constructing porous organic polymers (POPs) interlayers via diazo coupling reaction in the wild condition. The effects of the monomers ratio used to prepare POPs interlayers on the separation performance of the as-prepared TFC NF membranes as well as on the surface characteristics of substrate and polyamide (PA) separation layer were investigated. Due to hydrogen bonding, the POPs interlayers with hydroxyl groups slow down the diffusion rate of PIP molecules, which changes the surface structure of the polyamide (PA) separation layer from the nodular structure to the folded structure that favors increased permeability. The pure water permeance of the optimal TFC-S4 membrane (47.5 ± 0.3 L m −2 h −1 bar −1 ) is 3.8 times higher than that of the commercial polyamide nanofiltration membrane NF270 (12.5 L m −2 h −1 bar −1 ). Na 2 SO 4 rejection of the TFC-S4 membrane is 98.7 ± 0.1 %, which is greater than that of NF270 (96 %). This study provides ideas for future applications of POPs materials in NF membranes desalination.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）