JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 99
·期 12
·2693-2702
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IF 2.8
Yandong Lu,Jiaxu Ning,Yue Zong,Fu Ding,Gaige Liu,Ruijun Zhang
BACKGROUND Tailored design of high-performance nanofiltration membranes is desirable. The physicochemical properties of the organic phaseare essential for the preparation of nanofiltration membranes. Therefore, byfine-tuning the organic phase, it is possible to achieve nanofiltrationmembranes with enhanced performance. RESULTS In this work, oleic acid, a naturally extracted fatty acid, wasintroduced into three different organic solvents (n-heptane, n-octane andisopar G) to construct special oil phases for interfacial polymerization. Testingresults showed that proper dosage of oleic acid addition can effectivelydecrease the nanofiltration membrane pore size and enhance the salt rejectionregardless of the solvent type. Taking n-octane as example, 5% oleic acidaddition in it can decrease the mean pore size from 0.500 nm to 0.341 nm and improve the MgSO 4 rejection from 52.4% to 95.5%. Further characterizationindicated that the introduction of oleic acid into organic solvent cansignificantly reduce the interfacial tension and promote the diffusion of piperazinefrom aqueous phase to the oil phase. In addition, oleic acid could react with piperazineand produce some white particles that could be embed into the polyamide layer, thus altering the surface morphology. CONCLUSION In this work, a novel modified thin film composite nanofiltration membrane was prepared by a simple and controllable oleic acid assisted interfacial polymerization strategy, which exhibits good water permeability, solute selectivity and antifouling property. Without changing the existing process, our strategy opens up a simple, environmentally friendly and operable route for the synthesis of thin film composite nanofiltration membranes. © 2024 Society of Chemical Industry (SCI).
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanjun Zhang,Yu Yang,Satoshi Takizawa,Keisuke Kuroda,Zhiqian Jia,Peijuan Liu,Huangzhao Wei,Nigel J.D. Graham
The simultaneously efficient removal of radionuclides and heavy metals is an important and challenging topic for aquatic environmental protection. In this work, molybdenum disulfide (MoS 2 ) with heavy metal ion adsorption capacity and positively charged polyethyleneimine (PEI) were used to fabricate a novel layer-by-layer (LbL) self-assembly composite membrane by a simple alternating immersion method. The unique structure with positive charge ensures high removal for toxic metals (R Cs(I) = 99.83 %, R Sr(II) = 100 %, R Hg(II) = 99.2 %, R Pb(II) = 98.13 %, R As(III) = 98.5 %). The inherent low resistance channels in MoS 2 provided the optimized composite membrane an elevated water flux. Long-term experiments and membrane regeneration also demonstrated that the membrane possesses exceptional stability and reusability in removing low levels of radionuclides Cs(I) and Sr(II) from water. This study confirms the feasibility of the MoS 2 -PEI composite membrane for the treatment of contaminated waters containing radionuclides and heavy metals.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 5
·1-12
·
IF 6.048
Zhang Haiguang,Du Lei,Xing Jiajian,Wei Gaoliang,Quan Xie
Nanofiltration (NF) has attracted increasing attention for wastewater treatment and potable water purification. However, the high-efficiency removal of micropollutants by NF membranes is a critical challenge. Owing to the adsorption and subsequent diffusion, some weakly charged or uncharged micropollutants, such as bisphenol A (BPA), can pass through NF membranes, resulting in low removal rates. Herein, an effective strategy is proposed to enhance the BPA removal efficiency of a crosslinked polyaniline/carbon nanotube NF membrane by coupling the membrane with electro-assistance. The membrane exhibited a 31.9% removal rate for 5 mg/L BPA with a permeance of 6.8 L/(m 2 ·h·bar), while the removal rate was significantly improved to 98.1% after applying a voltage of 2.0 V to the membrane. Furthermore, when BPA coexisted with humic acid, the membrane maintained 94% removal of total organic carbon and nearly 100% removal of BPA at 2.0 V over the entire filtration period. Compared to continuous voltage applied to the membrane, an intermittent voltage (2.0 V for 0.5 h with an interval of 3.5 h) could achieve comparable BPA removal efficiency, because of the combined effect of membrane adsorption and subsequent electrochemical oxidation. Density functional theory calculations and BPA oxidation process analyses suggested that BPA was adsorbed by two main interactions: π–π and hydrogen-bond interactions. The adsorbed BPA was further electro-degraded into small organic acids or mineralized to CO 2 and H 2 O. This work demonstrates that NF membranes coupled with electro-assistance are feasible for improving the removal of weakly charged or uncharged micropollutants.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
·
IF 3.8
Ke Xiang,Hui-Hui Ping,Zhen-Liang Xu,Liwei Zhuang,Yong-Jian Tang
Heat curing is an essential step for industrial-scale fabrication of polyamide nanofiltration membranes, which can improve the membrane stability and promote the membrane element encapsulation feasibility, but thermal stresses cannot be avoided during this process. In this study, oven and microwave were used to cure nanofiltration membranes, and the results showed that compared with oven heat curing, the flux dispersion of nanofiltration membranes cured using microwave heat curing was reduced from 0.318 to 0.093, and its Na2SO4 rejection dispersion was reduced from 0.063 to 0.005, providing a tremendous improvement in the uniformity of nanofiltration membranes. The effect of the thermal stress distribution on the uniformity of nanofiltration membranes during heat curing was elucidated by numerical simulations. The fast microwave heating speed and uniform temperature distribution reduced the defects of the PA layer due to uneven thermal stress distribution. In conclusion, this study demonstrated the effect of thermal stress on membrane uniformity in different thermal curing modes, which provides good prospects for the application of microwaves in the field of nanofiltration membranes.
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
CELLULOSE
·
2021
·Vol. 28
·期 8
·4959-4973
·
IF 5.044
Wang Dong,Lin Junkang,Huang Jianhua,Zhang Hui,Lin Shan,Chen Lihui,Ni Yonghao,Huang Liulian
A major obstacle for the development of the cellulose-based nanofiltration membrane is its fouling. In this study, a novel cellulose-based composite nanofiltration membrane (CS/DA-TiO 2 -NFM) with excellent anti-fouling performance was prepared through casting of both chitosan (CS) and TiO 2 modified by dopamine (DA-TiO 2 ) on the cellulose substrate membrane. DA-TiO 2 was successfully introduced into the surface of membrane, resulting in significant improvement in its hydrophilicity due to the formation of dense CS layers. Furthermore, both CS and DA-TiO 2 were effective antimicrobial agents (against E. coli 90.6% and S. aureus 95.1%) that could minimize the accumulation of bacteria on the CS/DA-TiO 2 -NFM. For the antifouling test against BSA, the irreversible recovery ratio of the CS/DA-TiO 2 -NFM was only 23.25% of the control (no CS/DA-TiO 2 modified NFM). In addition, the CS/DA-TiO 2 -NFM exhibited an increased rejection rate of MgSO 4 (enhanced 40.93%) and water-flux (enhanced 18.10%) compared with the control. These results highlight the potential of the presented approach for designing membranes with effective separation performance and antifouling for drinking water treatment. Graphic abstract
研究领域:
材料科学
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环境科学
·
生物学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Guoke Zhao,Ying Wan,Guoyuan Pan,Hao Yu,Gongqing Tang,Xiaozhi Gong,Yang Zhang,Jie Sun,Yiqun Liu
Lithium extraction from brine sources such as salt lakes, seawater, and produced water from oil/gas fields is garnering increasing interests from the academic and industrial sectors due to its cost-effectiveness and reduced environmental impact. A critical technological challenge is the efficient separation of Mg 2+ and Li + ions. Many researchers have reported the preparation of positively charged nanofiltration membranes with quaternary ammonium groups, yet investigations about quaternary phosphonium groups are scarce. In this work, positively charged nanofiltration membranes were prepared utilizing polyethyleneimine as the aqueous phase monomer, trimesoyl chloride as the organic phase monomer, and 3-bromopropyl triphenyl phosphonium bromide as the functionalizing monomer. The TFC-P + membranes, enriched with a high density of quaternary phosphonium groups and an enhanced Donnan effect, achieve a MgCl 2 rejection of 98.9 %, a Mg 2+ /Li + selectivity of 81.6, and a water flux of 50 LMH under 0.5 MPa. The membranes possess an enhanced comprehensive separation capability that exceeds that of the majority of nanofiltration membranes documented in scholarly articles. Additionally, the membranes exhibit outstanding anti-fouling and anti-bacterial characteristics, essential for their industrial applications. The preparation method proposed herein is simple and conducive to continuous production processes. In light of the abundant produced water reserves from oil and gas extraction, future work will focus on pilot-scale lithium extraction experiments.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Tao Yao,Mingyu Zhang,Zhijiang Sun,Fen Ran
Water flux and ion sieving capability are the primary indicators determining the separation performance of nanofiltration membranes. Increasing the effective contact area between the membrane surface and water without sacrificing the membrane's density is a practical way to improve water flow while preserving salt rejection. By integrating hydrophilic nanoparticles during the interfacial polymerization process, it is feasible to indirectly modify the surface morphology of the nanofiltration membrane, so efficiently managing the generation and structure of the polyamide selective layer. Here it is suggested a technique that includes adding produced hydrophilic nanoparticles in one dimension to the interfacial polymerization process to form the polyamide composite membrane through interfacial polymerization. The fabricated ultrathin composite membrane exhibits a water flux of 19.4 Lm -2 h −1 bar −1 and a salt (Na 2 SO 4 ) rejection rate exceeding 93 %. Furthermore, due to the modification of the added nanomaterials, they can participate in the interfacial polymerization process, resulting in enhanced stability during prolonged testing.
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 APPLIED POLYMER SCIENCE
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2025
·
IF 2.8
Shuman Feng,Zezhen Zhang,Zekun Zhou,Lili Wu
This study developed a novel thin-film nanocomposite (TFN) membrane using vacuum-assisted deposition and surface chemical crosslinking by integrating MXene nanosheets with a tannic acid (TA) and polyethyleneimine (PEI) crosslinked network onto a PVDF substrate. A series of tests were conducted to characterize the chemical structure and surface morphology of the membranes, as well as to measure the concentrations of dye wastewater and saline solutions before and after filtration. The results showed that the introduction of the phenol-amine network altered the surface properties of the MXene layers, reducing the water contact angle to 49.8° and resulting in a negative zeta potential in the pH range 4–10. The optimized TFN-2 membrane achieved 100% removal of cationic dyes (methylene blue, malachite green, crystal violet), with rejection rates of 98.52%, 97.12%, and 100% for methylene blue, Congo red, and Coomassie brilliant blue G, respectively, and also exhibited certain salt ion rejection capability. Moreover, the introduction of the phenol-amine network significantly enhanced the oxidative stability of MXene. The TFN-2 membrane maintained stable flux and removal efficiency during 12 h of continuous operation and retained excellent separation performance after 90 days of storage. This study provides a new approach for developing high-performance separation membranes.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Wei Li,Chang Shi,Ayang Zhou,Xiao He,Yawei Sun,Jinli Zhang
For efficient recovery of lithium from brines, a composite nanofiltration (NF) membrane with positively charged skin layer (PA-B) was first synthesized via interfacial polymerization between branched poly(ethylene imine) (BPEI) and trimesoyl chloride (TMC) on the support of crosslinked polyetherimide, and the separation performance was assessed for simulative brine of mixed LiCl/MgCl 2 solution. To improve the permselectivity of Li + against Mg 2+ , then we adopted EDTA to modify the as-prepared positively charged PA-B NF membrane. The optimal EDTA modified NF membrane PA-B2-E3 showed the separation factor S Li , Mg about 9.2 for the LiCl/MgCl 2 mixed solution with a Mg 2+ /Li + mass ratio of 24, with excellent stability within 36 h filtration, which would have promising applications in the recovery of Li from brine.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 41
·34096-34102
·
IF 3.289
Wen-Ze Qiu,Yan Lv,Yong Du,Hao-Cheng Yang,Zhi-Kang Xu
High performance nanofiltration (NF) membranes are facilely fabricated via the co-deposition of catechol (CCh) and polyethylenimine (PEI) on the surface of a polysulfone (PSf) ultrafiltration membrane, with subsequent cross-linking by glutaraldehyde (GA). The surface properties of the studied membranes have been investigated in detail by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning election microscopy, atomic force microscopy, zeta potential, and water contact angle. The NF performance of the membranes are dependent on the CCh/PEI ratio, co-deposition time and cross-linking condition. Results reveal that the optimum membrane yields a rejection of 88% and a permeation flux of 25 L m−2 h−1 when filtrating the 1000 mg L−1 MgCl2 solution at 0.6 MPa. And the negatively charged membrane surface is related to the following salt rejection sequence: MgSO4 > Na2SO4 > MgCl2 > CaCl2 > NaCl. Meanwhile, the membranes show excellent operation stability during a 240 h consistent filtration test.
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 MEMBRANE SCIENCE
·
2014
·
IF 4.908
Mingming Li,Jia Xu,Chia-Yuan Chang,Chenchen Feng,Lili Zhang,Yuanyuan Tang,Congjie Gao
This work deals with a facile approach to fabricate a novel nanofiltration (NF) membrane consisting of a dense active layer from polyethyleneimine (PEI) cross-linking on a porous polysulphone (PS) substrate which was modified by self-polymerized dopamine (DA). Inspired by the bioadhesion principle, a composite membrane with a poly(dopamine) (poly(DA)) layer was fabricated by simply dipping the PS substrate into DA aqueous solution. Later, the modified PS substrate was thermal-treated and then impregnated into PEI solution for PEI grafting on the poly(DA) layer. Finally, PEI cross-linking was performed and as a result a composite PS/DA/PEI c membrane with a dense cross-linked DA/PEI layer was obtained, which exhibited a typical NF property. Several parameters such as PEI grafting, thermal treatment, cross-linkers and operating conditions were investigated to obtain the optimum composite membrane with an excellent NF performance. The results showed that the optimum NF membrane yielded a permeation flux of 43.96 L/m 2 h and a rejection of 89.27% when 2000 mg/L MgCl 2 solution was used as a feed solution at 0.8 MPa, whereas a permeation flux of 49.21 L/m 2 h and a rejection of 27.30% were obtained for a feed NaCl concentration of 2000 mg/L. These results show the promising use of such NF membranes in water softening.
研究领域:
材料科学
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生物仿生学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Bin Liu,Xinyue Cui,Xiaozhen Lu,Xuewu Zhu,Lin Wang,Junyong Zhu
Positively charged polyamide (PA) nanofiltration (NF) membranes with sub-nanopores show promise for lithium extraction from salt-lake brines with high Mg 2+ /Li + ratios. This study introduces the use of triamino guanidine (TG), a highly positively charged molecule, to regulate grafting on monolayer PA membranes, resulting in dual-layer (PEI-TMC-TG) NF membranes. The monolayer PA membranes were created via spin-coating assisted interfacial polymerization between polyethyleneimine (PEI) and tricarbonyl chloride (TMC). The PEI/TMC-TG NF membranes exhibited several advantages over unmodified PEI-TMC NF membranes, including higher positive charge density, narrower pore size distribution, excellent hydrophilicity, and a more porous separation layer microstructure. Experimental results indicated that enhanced Donnan effect, size sieving, and dielectric repulsion within the sub-nanopores contributed to exceptional Li + /Mg 2+ selectivity during filtration of East Taijiner brine (S Li + /Mg 2+ = 64.5). Furthermore, the TG hydrophilic layer significantly improved water permeability (15.4 LMH/bar) and long-term stability. To reduce membrane fouling in the charge-positive NF process by removing organic matter from complex salt lake brine, we explored electrocoagulation as a pre-treatment method and identified optimal conditions for the EC-NF process. This strategy maximizes sustainable lithium recovery from brine in an economically viable green manner while enhancing the efficiency of NF membranes for lithium extraction from salt lakes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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