JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Liang Shen,Ming Yi,Lian Tian,Fangqian Wang,Chun Ding,Shipeng Sun,Ang Lu,Li Su,Yan Wang
Membrane-based forward osmosis (FO) technology has attracted increasing interest in the field of water treatment due to its high economical and separation efficiency. However, the availability of a FO membrane with superior separation and antifouling properties is still the critical issue for its real application in wastewater purification. In this work, novel thin-film composite (TFC) membranes are developed by surface ionization with various metal ions and subsequent metallization with the assistance of pre-grafted polyethyleneimine (PEI) and N -containing organic phosphonic acid (OPA), where the latter provides abundant and stable complexing sites. The grafting of hydrophilic PEI/OPA and the attachment of silver atoms endow the resulting membrane a dual defensive and offensive functionality associated with anti-adhesive property and antibacterial activity, respectively. Compared with the control TFC membrane, the surface-modified membranes show significantly improved anti-adhesive property against bovine serum albumin (BSA) and antibacterial property against S. aureus and E. coli bacteria, and thereby improved antifouling property towards the local lake water. Additionally, compared with the silver-metalized TFC membranes prepared by the direct method or indirect PEI binding, the silver-metalized membrane prepared by the indirect OPA binding exhibits a much higher silver loading (34.38 μg/cm 2 ), as well as better, more stable and long-term antibacterial property. Moreover, compared with the control membrane, the modified membranes also have much higher water fluxes (87–141% increase) and comparable or even lower reverse salt fluxes. The influences of the metal ion type used for ionization and the method used for metallization are systematically investigated.
研究领域:
材料科学
·
环境工程
·
水处理技术
✓ 已验证
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Tong Wu,Zhen-Liang Xu,Yong-Jian Tang
Various salt additives were widely used to enhance the permeability of thin-film composite (TFC) membranes. Researchers attributed the improvement in TFC membranes to the change in the polyamide (PA) layer. However, the contribution degree of PA layer to TFC membrane permeability enhancement and the effect of salt additives on the substrate are ambiguous. In this study, the effect of salt additives on the permeation resistance of FTC membranes was analyzed. The results showed that the salt additives could reduce both the permeation resistance of the PA layer and substrate, but the effect on the substrate was more pronounced. For example, after adding NaCl, the permeation resistance of the substrate in the heat curing membrane reduced from 0.1764 to 0.0201 bar h m −1 , which was much more than that in the PA layer. This study revealed a new mechanism of salt additives improving the permeability of TFC membranes and deepened the understanding of the action mechanism of salt additives.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chao Wang,Yujia Lu,Peijuan Chu,Tengfei He,Lijia Liu,Chunhong Zhang
Thin film composite (TFC) membranes with advanced antibacterial and separation performance are essential for practical application. Adding additional antibacterial agents is always needed to improve the antibacterial ability of TFC membrane, and it may decline the separation performance of this membrane. Herein, naringin (NG), as a green and renewable flavonoid molecule, possesses bacteriostatic and abundant reactive hydroxyl groups. Thus, a novel TFC [NG/trimesoyl chloride (TMC)] membrane with intrinsically antibacterial ability was constructed using NG as the aqueous phase molecule via facile interfacial polymerization with TMC. The NG/TMC membrane demonstrated low roughness and high negative charge surface, and the retention rates to Evan’s blue, Congo red, Sunset yellow, and methyl orange were all above 99.0%. Meanwhile, the NG/TMC membrane exhibited an outstanding antibacterial ability, the antibacterial rate to E. coli and S. aureus can reach 99.36% and 98.39%, respectively. This kind of novel NG/TMC membrane with inherent antibacterial ability has significant advantages in practical applications.
研究领域:
材料科学
·
环境工程
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2018
·
IF 6.603
Guihua Xie,Wenxuan Xu,Qingchun Ge
Gradual ionizing forward osmosis (FO) membranes were synthesized through tailoring modifications with alendronate materials on polyamide thin film composite (TFC) membrane surfaces . The newly developed membranes have gradually ionized surfaces and are more hydrophilic after introducing amino, hydroxyl and phosphate groups derived from the alendronates. Significantly improved performance was achieved with the alendronate-modified membranes relative to the unmodified membrane. With DI water as the feed and 0.5 M MgCl 2 as the draw solution, the novel membranes yielded water fluxes 35–60% higher than the nascent one. When MgCl 2 (2.0 M) as the draw solution, alendronate tetrasodium (A-4Na) modified membrane had a water permeation rate of 17.3 LMH under FO mode (feed solution faced the membrane active layer) in seawater desalination , a 25% increase compared to that of the pristine membrane and surpasses many other recently-developed FO membranes, remarkably increasing water filtration efficiency.
研究领域:
化学工程
·
环境科学
·
材料科学
·
水处理
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Wenguang Wang,Ru Liu,Ming Tan,Haixiang Sun,Q. Jason Niu,Tongwen Xu,Victor Nikonenko,Yang Zhang
The current methods for determination of the membrane specific permselectivity between two competing counter-ions are dependent on various factors, which hinder the comparison of ion selectivity of ion selective membranes . In this work, a new characteristic, “ideal selectivity” is suggested to be used for the evaluation of the specific permselectivity of monovalent selective membranes. Ideal selectivity is determined in a single electrolyte solution containing only one of the competing counterions. We show that this characteristic exhibits a stable value, which is independent from the molar fraction of ions in a solution. Thus, it may be directly used to predict the purity of a salt produced in a dynamic selectrodialysis (SED) process with a monovalent selective membrane. To elaborate this, thin film composite (TFC) cation exchange membranes were prepared with piperazine and trimesoyl chloride by interfacial polymerization. These membranes were compared with a commercial monovalent selective cation exchange membrane CIMS (ASTOM, Japan) in view of their permselectivity (Na + /Mg 2+ ) and the performance in SED. The results show that when the TFC membranes were applied in SED, the purity of Mg 2+ in the product reached 75%, which was higher than in the case of CIMS. Furthermore, ideal selectivity of those TFC and CIMS membranes were calculated and fitted with the experimental Mg 2+ purity. It was found that ideal selectivity linearly correlates with the product final purity. The extrapolation of the fitting line predicts that when ideal selectivity approaches to 2, SED process the purity could theoretically approach to 100% in the same experimental conditions. Therefore, ideal selectivity can be used to predict the separation efficiency and the final product purity of SED process.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xinzhen Zhao,Changkun Liu
In order to efficiently remove the heavy metal ions in wastewater, a novel thin film composite (TFC)-type forward osmosis (FO) membrane was prepared specifically with the glass nanofiber supporting layer and the bovine serum albumin (BSA)-embedded polyamide (PA) swellable active layer, and used for the removal of heavy metal ions from water by enhanced dissolution-diffusion-flow FO process. The separation results indicated that the appropriate addition of BSA in the PA active layer improved the dissolution-diffusion process of the traditional PA layer by providing the swellable sites as water channels in aqueous solutions and enhanced the rejection effect on heavy metal ions. In addition, the ultra large porosity and pore size of the glass nanofiber supporting layer provided smooth flow channels, accelerating the flow process and alleviating the concentration polarization problem, with the structural parameter (S) value decreasing to 172 μm. This paper proved that the specific structural construction of the functional membranes was a convenient method to prepare applicable membranes with tunable FO performances.
研究领域:
环境工程
·
水处理
·
膜科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2020
·
IF 7.098
Xuan Zhang,Shu Xiong,Chu-Xuan Liu,Liang Shen,Song-Lin Wang,Wan-Zhong Lang,Yan Wang
Substrate modification is advantageous to ameliorate the internal concentration polarization (ICP) phenomenon encountered by most thin-film composite (TFC) membrane in forward osmosis (FO) process, therefore promoting FO implementation to a large extent. Optimization of the intrinsic parameters of substrate (e.g. porosity and tortuosity) can generally be achieved by incorporating hydrophilic or pore-containing materials into the dope solution before the substrate fabrication. In this work, polyvinylidene fluoride (PVDF) substrate with embedded thermal-response poly (N-isopropyl acrylamide) (PNIPAM) microgels is employed for the construction of TFC-FO membrane, where the reversible shrinkage of PNIPAM microgels brings about a lower tortuosity and a higher porosity of the substrate at higher operation temperature, thereby mitigating the ICP impact of the TFC-FO membranes significantly. Effects of PNIPAM content on the properties of the substrates and the resultant polyamide (PA) layer, as well as the corresponding performance of the TFC-FO membranes were comprehensively investigated. The benchmarking shows that, TFC membrane with PNIPAM-modified substrate exhibits remarkably improved water flux of 40.2 L·m −2 ·h −1 and a reduced reverse salt flux of 10.1 g·m −2 ·h −1 , with DI water as feed (50 °C) and 1 M NaCl as draw solution (ambient temperature), which suggests its great potential for treating feed solution with relatively high temperature in the practical applications, for instance, the dyestuff wastewater enrichment.
研究领域:
膜科学
·
环境工程
·
水处理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Miaolu He,Lei Wang,Yongtao Lv,Xudong Wang,Zhe Zhang,Qi Cui,Jiani Zhu
A thin-film composite (TFC) membrane with hydrophilic double-skinned support layer was developed to improve anti-fouling performance. The double-skinned separate casting technology was applied to obtain the double-skinned support layer and the polyacrylonitrile (PAN) concentration in the bottom casting solution was adjusted. Then, the support layer was carboxylated by immersing in a 1.5 M NaOH solution for 2 h. Finally, TFC membrane with hydrophilic double-skinned support layer was obtained by the interfacial polymerization. When the PAN concentration in the bottom casting solution was 10 wt%. TFC membrane with hydrophilic double-skinned support layer (TFC-10 %) showed the best performance. The water flux of TFC-10 % reached 17.6 LMH and the reverse salt flux was 5.6 gMH. Under the double interception effect of the double-skinned structure and the steric hindrance of the hydration layer on the support layer, good anti-fouling property of TFC-10 % was observed under bovine serum albumin (BSA) foulant. Compared to the traditional TFC membrane, the normalized flux of TFC-10 % increased by 80 %. The anti-fouling performance was also analyzed by microaction mechanisms using AFM and QCM-D. It was found that the adhesion force between TFC-10 % and BSA was small, therefore fewer pollutants were adsorbed on TFC-10 %, and its adsorption layer was loose and easy-cleaning.
研究领域:
膜科学
·
水处理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Yi-Xin Wang,Cheng-Ye Zhu,Jingliang Huang,Hao-Cheng Yang,Zhi-Kang Xu
Thin-film composite (TFC) membranes can find broad uses in desalination and wastewater treatment . However, industrialized interfacial polymerization involves many organic solvents and toxic monomers . An aqueous fabrication process can meet the standards of green and sustainable production, but fabricating defect-free thin films in a homogenous phase remains challenging. Herein, we fabricate a series of TFC nanofiltration membranes through a contra-diffusion process based on the cross-linking of metal ions and alginate . The film formation is confined at the ultrafiltration substrate surface due to the competition between reaction and restricted diffusion. Among a series of metal ion/alginate composites, the Cu 2+ /alginate composite membrane displays superior nanofiltration performance because of the strong affinity between Cu 2+ and alginate. The highly negatively charged membrane performs a high rejection to divalent anions and anionic dyes based on the Donnan effect . The effects of alginate concentration and diffusion time on membrane performance were investigated to achieve optimal fabrication conditions. The as-prepared membrane shows a rejection of 96.2% to Na 2 SO 4 with permeation flux around 50.2 L·m −2 ·h −1 under 0.6 MPa, and 99.5% to several dye molecules. Moreover, the membrane performs outstanding anti-fouling and anti-bacterial properties because of its excellent hydrophilicity and the existence of Cu 2+ .
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2024
·Vol. 10
·期 32
·
IF 11.7
Ayan Yao,Junjun Hou,Pengjia Dou,Jingcheng Du,Qian Sun,Ziye Song,Linghao Liu,Jian Guan,Jiangtao Liu
Thin-film composite (TFC) membranes have gradually replaced some traditional technologies in the extraction, separation, and concentration of high value-added pharmaceutical ingredients due to their controllable microstructure. Nevertheless, devising solvent-stable, scalable TFC membranes with high permeance and efficient molecule selectivity is urgently needed to improve the separation efficiency in the separation process. Here, we propose phenolphthalein, a commercial acid-base indicator, as an economical monomer for optimizing the micropore structure of selective layers with thickness down to 30 nanometers formed by in situ interfacial reactions. Molecular dynamics simulations indicate that the polyarylate membranes prepared using three-dimensional phenolphthalein monomers exhibit tunable microporosity and higher pore interconnectivity. Moreover, the TFC membranes show a high methanol permeance (9.9 ± 0.1 liters per square meter per hour per bar) and small molecular weight cutoff (≈289 daltons) for organic micropollutants in organic solvent systems. The polyarylate membranes exhibit higher mechanical strength (2.4 versus 0.8 gigapascals) compared to the traditional polyamide membrane.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·
IF 1.911
Yazhi Yang,Qianqian Lan,Yong Wang
Thin film composite (TFC) membranes represent a highly promising platform for efficient nanofiltration (NF) processes. However, the improvement in permeance is impeded by the substrates with low permeances. Herein, highly permeable gradient phenolic membranes with tight selectivity are used as substrates to prepare TFC membranes with high permeances by the layer-by-layer assembly method. The negatively charged phenolic substrates are alternately assembled with polycation polyethylenimine (PEI) and polyanion poly(acrylic acid) (PAA) as a result of electrostatic interactions, forming thin and compact PEI/PAA layers tightly attached to the substrate surface. Benefiting from the high permeances and tight surface pores of the gradient nanoporous structures of the substrates, the produced PEI/PAA membranes exhibit a permeance up to 506 L ∙ m −2 ∙ h −1 ∙ MPa −1 , which is ~ 2–10 times higher than that of other membranes with similar rejections. The PEI/PAA membranes are capable of retaining > 96.1% of negatively charged dyes following the mechanism of electrostatic repulsion. We demonstrate that the membranes can also separate positively and neutrally charged dyes from water via other mechanisms. This work opens a new avenue for the design and preparation of high-flux NF membranes, which is also applicable to enhance the permeance of other TFC membranes.
研究领域:
材料科学
·
纳米技术
·
膜技术
·
环境工程
✓ 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）