SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Mengmeng Jia,Wen-Hai Zhang,Xuehong Zhang,Ming-Jie Yin,Shuo Gu,Xinmiao Hu,Hongxia Guo
Preparation of membranes with loose structure is often required for excellent small organic molecules desalination, but remains a grand challenge. In this work, a loose thin film composite (TFC) membrane was fabricated via interfacial polymerization of hydroxypropyl-β-cyclodextrin (HP-β-CD) and trimesoyl chloride. Besides, tannic acid was added in the aqueous phase to boost the rejection rate of the membrane by reducing the “outer space” distance among HP-β-CD. The resulting membrane exhibited an optimal permeability of 82.9 L m −2 h −1 bar −1 along with antibiotic desalination efficiency (94.8 % for tetracycline hydrochloride and 8.5% for NaCl). Moreover, experiment results demonstrate that the tannic acid incorporated HP-β-CD-based polyester (TIHP) membrane was also endowed with enhanced chlorine resistance and antifouling ability deriving from its rich hydroxyl and polyester structures, which makes the membrane promising for the purification of antibiotics in pharmaceutical fields.
研究领域:
材料科学
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环境工程
·
制药工程
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产品关联
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
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产品关联
DOI
高影响因子
DESALINATION
·
2020
·
IF 7.098
Jiayu Tian,Hailin Chang,Shanshan Gao,Ruijun Zhang
The potential toxicity of heavy metals arising from the discharge of industrial wastewater has become a serious public concern. Fabrication of a thin film composite (TFC) NF membrane with desirable rejection of heavy metal ions is an attracting route to solve this problem. Hereon, we proposed a facile strategy for fabricating a TFC NF membrane with excellent heavy metal removal. The ratio of PIP and TMC was greatly enlarged by decreasing the concentration of TMC to an exceptional low extent. Thus a polyamide film with weak electronegativity and small pore size was successfully constructed on an ultrafiltration substrate membrane. Comprehensive characterizations were adopted to reveal the micro-variation of the resulted NF membranes when regulating TMC concentration . The optimized membrane prepared only with PIP and TMC can exhibit a high pure water permeability of 14.6 L m −2 h −1 bar −1 , desirable rejection of over 98% against Ni 2+ , Zn 2+ , Cu 2+ , and >92.7% against Cd 2+ . This performance could go beyond most of the reported candidates which were prepared with other complicated methods. The simplicity, low cost and scaling up feasibility of the current strategy is expected to well meet the requirements of industrial production of TFC NF membrane for heavy metal removal.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Nan Sun,Pengjia Dou,Hailong He,Longwei Xu,Vahid Vatanpour,Chongqing Wang,Yue-Biao Zhang,Tao He
This study explored the unique hydrolysis character of arsenate and counterintuitive concentration/rejection behavior using a low-cost polyethylene (PE) separator supported thin-film composite (TFC) nanofiltration membranes (PE-NF). The newly developed PE-NF membrane showed 99.6 % rejection for Na 2 SO 4 and high water permeance of 18.2 LMH/bar; the high performance was attributed to the support's high surface porosity and the thin active layer with minimal transport distance as well as highly negatively charged surface and narrow pore size distribution. Increased rejection of As(V) from 73.8 % to 98.8 % as the feed concentration increasing from 0.13 to 57.3 mg/L was explained by the hydrolysis of HAsO 4 2− at a high concentration. Hydrolysis of HAsO 4 2− resulted to pH increase and enhanced Donnan exclusion by the PE-NF membrane. Simulation demonstrated severe external concentration polarization (ECP) due to high rejection, low diffusivity of As(V) ions, and high water permeance which in turn causes pH increase at the membrane surface. One stage NF permeate satisfied the surface water standard based on a synthetic underground water, showing great promise of present low cost NF membranes for efficient As(V) removal.
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2017
·
IF 6.035
Liang Shen,Xuan Zhang,Jian Zuo,Yan Wang
In this work, simple and effective second interfacial polymerization (SIP) of thin-film composite (TFC) membranes is performed with polyethyleneimine (PEI) of various molecular weights, in order to improve the separation performance for forward osmosis (FO) applications. Various characterization techniques are employed to examine the modification mechanism. Compared to the control TFC membrane, PEI-modified membranes exhibit higher water permeabilities, acceptable salt rejection and lower fouling propensity. The effects of PEI molecular weight on the membrane morphology and separation performance are investigated systematically with various characterizations. Post-treatment of PEI-modified membranes in alkaline and acidic aqueous solutions is further investigated, and its effects on the FO performance, intrinsic separation properties and antifouling properties of these post-treated membranes are studied. In comparison with pristine PEI-modified TFC membranes, the post-treated TFC membranes show further enhanced water flux and improved anti-fouling properties.
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
Membranes
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2022
·Vol. 12
·期 4
·368
·
IF 4.562
Yi Wang,Yuqi Nie,Chunhong Chen,Hongjie Zhao,Ye Zhao,Yujin Jia,Jun Li,Zhanguo Li
MXene nano-sheets were introduced into a thin-film composite membrane (TFC) to reduce the mass transfer resistance (concentration polarization) and improve the membrane performance. The process entailed dissolving the MXene nano-sheets in a membrane casting solution using the blending method and introducing them into the porous support layer to prepare a modified thin-film composite forward osmosis (TFC-FO) membrane. The results showed that the water contact angle decreased by about 16%, indicating that the hydrophilicity was strengthened, and the O/N ratio of the active selective layer decreased by 13%, indicating an increased degree of crosslinking, thereby demonstrating that the introduction of MXene nano-sheets changed the properties of the membrane and played a positive role in its physicochemical properties. In contrast to the unmodified TFC-FO membrane, the modified membrane had a slightly higher reverse solute flux, while its water flux increased by about 80%. Its specific reverse osmosis flux was also significantly optimized (only 0.63 g/L). In conclusion, adding MXene nanosheets to TFC-FO membranes led to the modified membranes with better mass transfer, lessened internal concentration polarization (ICP), and better osmotic separation.Keywords:TFC-FO membrane;MXene nano-sheets;internal concentration polarization
研究领域:
材料科学
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膜技术
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纳米技术
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Shao-Lu Li,Pengfei Wu,Juntao Wang,Yunxia Hu
As known, piperazine (PIP) and m -phenylenediamine (MPD) are popularly employed as aqueous monomer to interfacially polymerize with trimesoyl chloride (TMC) for the fabrication of TFC polyamide NF and RO membrane, respectively. In this work, we designed a novel amine monomer 4-(piperazin-1-yl)benzene-1,3-diamine (PMPD) having the combined PIP and MPD units in one molecule and employing it with TMC to prepare the pristine nanofiltration membrane. Subsequently, zwitterionic antifouling PA surface was constructed by modification with 3-bromopropionic acid (3-BPA). The resulting membrane (PMPD-PA) exhibited a smoother surface with enhanced surface hydrophilicity than the membrane made from MPD, and the thickness of the PA active layer was down to ~35 nm. Meanwhile, its pure water permeability was ~19 L m −2 h −1 bar −1 , with Na 2 SO 4 rejection of 98.4%, and NaCl rejection as low as 24.1%, performing as a novel selective NF membrane. Furthermore, fouling tests using model foulants BSA and SA well illustrated the good antifouling properties of membrane PMPD-PA with the mitigated flux decline and enhanced flux recovery upon physical cleaning. Thus, this work further demonstrates the fabrication of high-performance TFC NF membrane from the perspective of molecular design.
研究领域:
材料科学
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膜技术
·
化学工程
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产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Yaxu Guan,Shao-Lu Li,Zhenxing Fu,Yiwen Qin,Juntao Wang,Genghao Gong,Yunxia Hu
In this work, we synthesized a zwitterionic polymer PEI-CA for the first time and then grafted it onto the surface of polyamide RO membrane via layer-by-layer interfacial polymerization (LbL-IP). XPS and ATR-FTIR techniques were used to verify the successful modification with PEI-CA. The zwitterionic hyperbranched polymer PEI-CA endowed the modified membrane with much improved surface hydrophilicity and decreased surface negative charge. The tailored M-PEICA exhibited a high water permeance up to 3.92 L m −2 h −1 bar −1 (increased by 62 %) while holding a good NaCl rejection (98.93 %). The dynamic fouling experiments proved that grafting of PEI-CA can help to effectively elevate its antifouling performance against most organic foulants except small molecular negatively charged surfactant SDS. Therefore, we further employed the mixed reagents modification strategy with arginine and PEI-CA, the resulting RO membrane M-mixed presented obviously improved antifouling performance towards SDS, the overall antifouling performances are even better than the well-known RO membrane CR100 of DOW FILMTEC™, that well illustrated multiple reagents modification strategy could be an efficient way that can meet all critical standards. Overall, the novel polymer PEI-CA and as-fabricated RO membranes with outstanding antifouling performances in this study have vast application potential in field of water treatment .
研究领域:
水处理
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膜科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yu Miao,Chong Wang,Jixiao Wang,Zhi Wang
Thin film composite reverse osmosis (TFC RO) membrane technology has seen widespread application in seawater/brackish water desalination and wastewater treatment . However, there are still problems such as unsatisfactory perm-selectivity and anti-fouling properties, and low feasibility of membrane manufacturing process. In view of the above problems, a novel UV-initiated modification process integrating with "Semi-interpenetrating polymer networks construction" and "Photo-Fries rearrangement initiation" is proposed. TFC RO membranes with both high perm-selectivity and anti-fouling properties were prepared by introducing polymerizable molecules (MAM, SA , AM) into the aqueous phase and conducting UV irradiation during interfacial polymerization (IP) process. The results showed that under the brackish water test conditions, the water flux and NaCl rejection of the optimal modified membrane (MAM-UV) were 77.5 L m −2 h −1 and 99.44%, respectively, which are 23.8% and 0.2% higher than those of the unmodified membrane (VIR-RO), respectively. The results of the anti-fouling test showed that MAM-UV exhibited good anti-fouling properties against both bovine serum albumin (BSA) and lysozyme (LYZ). In addition, the novel UV-initiated modification process proposed in this paper has broad prospects for industrial application because of its simple operation and easy scale-up.
研究领域:
环境科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Pei Xiao,Xin Li,Lei Li,Fei Liu,Yi (Alex) Wang,Jian Li
Applications of environmentally friendly and low-cost biomaterials for membrane preparation offer unparalleled advantages over traditional synthetic polymer membrane. Herein, a novel collagen/casein/chitosan composite material was designed to synthesize TFC membrane for acid recovery from acidic waste stream. A vacuum filtration method was used to precious adjust the thickness of the functional layer while glutaraldehyde was adopted as crosslinking agent to preserve surface charge property of anion-exchange membranes (AEM) at acidic conditions. The electrostatic interactions and hydrogen bonding of these biopolymers endowed the TFC membrane with enhanced stability. At optimized conditions with 0.15 mL collagen/casein/chitosan composites decoration, the TFC membrane with a functional layer thickness of around 628.4 nm exhibited an excellent acid permeance (U H + = 0.034 m h −1 ) and a high H + / Fe 2+ separation factor up to 33.8. This facile strategy provides a useful guideline for constructing highly efficient TFC membrane for acid recovery and broadens the application of biomaterials for membrane application at harsh environments.
研究领域:
生物材料学
·
膜科学与技术
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Xu Li,Zhi Wang,Xianglei Han,Jixiao Wang
The insufficient boron removal performance is a conspicuous infirmity of reverse osmosis (RO) membranes for seawater desalination . Herein, RO membranes with high boron removal performance were prepared by adding 2-hydroxyethyl acrylate (HEA) and acrylamide (AA) into the m -phenylenediamine (MPD) solution and employing ultraviolet (UV) irradiation during the interfacial polymerization (IP) process. During the UV-imported IP process, the radical polymerization between HEA and AA was triggered to produce hydroxyl- co ntaining HEA-co-AA copolymers , while polyamide polymers were simultaneously generated. Attributed to the interspersion of hydroxyl-containing copolymers in the polyamide chain segments, the superior dense and tight structure of the hybrid separation layer was achieved. Crucially, the high electron density hydroxyl groups enriched in the hybrid separation layer could specifically interact with the electron-deficient boric acid via electrostatic interaction and hydrogen bond . Therefore, in the modified membrane, the diffusion of boric acid was inhibited. Consequently, for the modified membrane, the boric acid retention rate was dramatically increased from 84.42% to 92.80%. Additionally, NaCl retention rate and water flux were also promoted. The UV-imported IP process was neither process-intensive nor time-consuming, exhibiting high compatibility with the continuous membrane production. It was expected that this work would guide the innovation of high boron removal RO membranes and other types of IP-made membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Xueting Song,Lusi Zou
Membrane distillation (MD) encounters severe operational bottlenecks arising from complex organic fouling coupled with oxidative membrane degradation during inevitable chemical cleaning. Conventional polyamide (PA) membranes are intrinsically susceptible to chlorine attack, which further exacerbates this issue. To overcome this critical bottleneck, a novel dual layer thin-film composite (TFC) Janus membrane (denoted as TFC (PE-PA) ) was developed via sequential interfacial polymerization (SIP) strategy. An ultrathin polyester (PE) skin layer was grown in situ directly onto a highly permeable PA substrate. The as-prepared composite membrane features a significantly smoothed surface topography and a highly hydrophilic character, which together establish a robust hydration barrier. This unique architecture effectively repels complex foulants, including oil droplets and amphiphilic organics. Consequently, the membrane exhibited exceptional durability and maintained near-complete salt rejection throughout 120 h of continuous desalination of hypersaline wastewater with a highly complex matrix. Furthermore, the ester-rich PE top layer lacks the vulnerable amide nitrogen sites that typically trigger chlorine-induced depolymerization. This inherent structural advantage enables the top layer to function as a robust chemical shield. The membrane demonstrated outstanding chemical inertness under a massive cumulative chlorine exposure of 72,000 ppm h at the highly aggressive pH of 5. During a rigorous 160-h long-term test comprising 32 consecutive cycles of organic fouling and aggressive chlorination cleaning, the dual-layer membrane retained an unprecedented flux recovery rate (FRR) exceeding 96.16%. This rational interfacial design successfully decouples intrinsic material vulnerability from long-term separation performance, offering a highly reliable engineering solution for sustainable industrial wastewater treatment.
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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）