JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Yafei Su,Hao Luo,Huawen Peng,Yongjin Hu,Jingyi Rao,Qiang Zhao
Facile preparation of loose nanofiltration membranes (LNMs) with good chlorine resistance is highly demanded for water purification . Here, we reported the preparation of LNMs via the interfacial quaternization of hexamethylenetetramine (HMTA) with 1,3,5-benzenetricarbonyl trichloride (TMC). Both the macrocyclic structure of HMTA and the relatively low reactivity of tertiary amines are beneficial for the formation of loose structures with high permeance. The resulting HMTA/TMC LNMs showed high water permeance (71.0 L m −2 h −1 bar −1 ) combined with good Evans Blue (EB)/NaCl selectivity (EB rejection: 98%, NaCl rejection: 12.7%). Notably, the LNMs features quaternary amide structure that contains no active hydrogen, thus the high separation performance was maintained during 20-days immersion of the membrane in 200 ppm NaClO solution. Furthermore, chlorine resistance of the membrane was retained at varied pH conditions, and separation performance of the fouled membranes could be restored by NaClO cleaning. Considering these beneficial properties, the membrane holds great promise in dye/salt separation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Jun Xu,Zhi Wang,Linling Yu,Jixiao Wang,Shichang Wang
Currently, biofouling and the chlorine degradation of membrane during the control of biofouling are still the major obstacles to the development of reverse osmosis (RO) membranes technology . In this work, both the anti-biofouling and the chlorine resistant properties of a commercial aromatic polyamide RO membrane (RE4021-TL, Woongjin Chemical Co., Ltd.) are improved by carbodiimide-induced grafting with imidazolidinyl urea (IU). The grafted IU not only endows the membrane with high anti-biofouling property by acting as an anti-microbial agent but also endows the membrane with the other durable and regenerable anti-biofouling and chlorine resistant properties by acting as the precursor of N -halamine. The grafting of IU and the grafting amount are analyzed by ATR-FTIR and XPS , respectively. The hydrophilicity of the membrane surface is improved obviously and the isoelectric point of the membrane surface shifts toward higher value. A cycling experiment indicates the high regeneration abilities of both the anti-biofouling and the chlorine resistant properties. Moreover, the long-term investigation (100 days) results show that the IU modification accompanied with the periodical free chlorine pretreatment in the RO systems is a potential strategy to increase the lifetime of the commercial RO membranes in practical application.
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
CHEMOSPHERE
·
2022
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IF 8.943
Chongbin Wang,Hongchao Wang,Yongsheng Li,Yuanyuan Feng,Kun Zhang,Sijie Fan,Li Cao
Constructing membrane with good chlorine resistance and antifouling properties is considered to be important challenges confronting membrane applications. In this study, a composite nanofiltration (NF) membrane (β-CD x/y /PES) was prepared by interfacial polymerization using beta cyclodextrin (β-CD) monomers . Subsequently, the β-CD-based (AZ-β-CD x/y /PES) membrane was prepared by assembling azobenzene labeled zwitterions into the hydrophobic internal cavity of β-CD via host-guest interaction. The optimized membrane exhibited slight change in water flux and rejection under chlorine environment. The AZ-β-CD x/y /PES membrane also displayed an evidently lower loss in water flux in the antifouling test in comparison with the β-CD x/y /PES membrane. More interestingly, the trans azo groups in azobenzene labeled zwitterions can turn into the cis isomers as the visible light irradiation converted to the UV light irradiation, breaking the interaction between azobenzene labeled zwitterions and β-CD. Hence, the contaminants upon the membrane surface can be simply eliminated by water washing under UV light irradiation. The antifouling membrane can be regenerated via immersing the reacquired β-CD 2/10 /PES membrane into fresh azobenzene labeled zwitterions solution again.
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
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Luyang Cheng,Qing-Wei Meng,Qingchun Ge
The demand to improve the chlorine resistance of polyamide (PA) membranes is escalated with greater amounts of chlorine-containing disinfectant being used in global water treatment during the COVID-19 pandemic. In this work, we designed thiophene-functionalized poly(ethyleneimine) (TPEI) materials first and grafted them onto a conventional PA membrane to develop novel nanofiltration membranes (PEI-M, TPEI-1-M, TPEI-2-M). These membranes have dual-functionalized selective surfaces covered by hydrophilic amino groups and electron-rich thiophene moieties, which endow these membranes with superior chlorine resistance and improved separation performance. The modified membranes increase the rejection of MgCl2 from 86.5% of the nascent PA membrane (PA-M) to higher than 93.0% without sacrificing the membrane water permeability. More stable separation performance is achieved with all of the as-prepared membranes than PA-M after exposure to a 2000 ppm sodium hypochlorite solution. TPEI-2-M outperforms other membranes after being treated in a chlorination intensity of 16,000 ppm·h with the smallest flux loss and the highest MgCl2 rejection. This is mainly ascribed to the highest amount of amino and thiophene moieties on the TPEI-2-M surface. This study provides an effective protocol for developing novel PA-based nanofiltration membranes while demonstrating its superiority over current technologies with exceptional separation performance and antichlorine ability.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Xu Ruotong,Xing Jiayi,Chen Ruisi,Tang Yulin,Zhang Yongji
This study investigated the effects of tetracycline (TC) and sulfadiazine (SD), along with their degradation products, on biofilm chlorine resistance. The results showed that low concentrations of antibiotics and their degradation products promoted biofilm formation on tube surfaces and increased resistance to chlorine. There was a positive correlation between antibiotic levels, degradation products, and biofilm chlorine resistance within a specific concentration range. SD had a more significant impact on biofilm chlorine resistance compared to TC. The presence of both antibiotics and their degradation products in water led to an increase in biofilm chlorine resistance, especially when combined with 0.3 mg/L sodium hypochlorite. The study shows a positive association between antibiotic and degradation product concentrations and the biofilms' improved chlorine resistance, a phenomenon that could have major consequences for water treatment efforts. Additionally, higher concentrations of antibiotics and their degradation products were associated with reduced biodiversity within the biofilm. Overall, the findings suggest that the presence of antibiotics and their degradation products can influence biofilm formation, alter bacterial species composition, and enhance biofilm resistance to chlorine in drinking water distribution systems. This fresh perspective on the relationship between pharmaceutical residues and microbial communities in water systems could transform our approach to assuring water safety and combatting antimicrobial resistance.
研究领域:
微生物学
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环境科学
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水处理工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Ningning Gao,Wenbin Xie,Lijing Xu,Qingping Xin,Junkui Gao,Junjun Shi,Jin Zhong,Wenxiong Shi,Huiguo Wang,Kongyin Zhao,Ligang Lin
The development of membranes for protein purification has stringent requirement of disinfection resistance, low protein adsorption and anti-fouling, without changing protein structure. In this study, hydrophilic titanium dioxide (TiO 2 )/calcium alginate (TiO 2 /CaAlg) hydrogel membranes were prepared by a simple ionic cross-linking method. The effects of the porogenic agent polyethylene glycol (PEG) concentration, the molecular weight of PEG, and the concentration of TiO 2 on the filtration properties were systematically investigated. The TiO 2 /CaAlg membrane exhibited excellent bovine serum albumin (BSA) rejection and anti-fouling properties. The mechanical properties and surface energy of the TiO 2 /CaAlg membrane were significantly improved. The chemical bonding mechanism of TiO 2 and NaAlg was investigated by molecular dynamic simulation. The TiO 2 /CaAlg membrane had good chlorine resistance and could be disinfected or cleaned with sodium hypochlorite. The TiO 2 /CaAlg hydrogel membrane loaded with polyhydroxybutyrate (PHB) nanofibers maintained high flux (136.7 L/m 2 h) and high BSA rejection (98.0 %) at 0.1 MPa. The results of circular dichroism and synchronous fluorescence indicated that the secondary structure of BSA was maintained after membrane separation. This study provides one method for the preparation of green and environmentally friendly membrane for protein purification.
研究领域:
生物工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 20
·47406
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IF 2.188
Qing Chen,Fei Sun,Jin Zhou,Yao Lu,Yuan-Yuan Li,Hai-Yin Yu,Jia-Shan Gu
To improve chlorine resistance and mitigate the internal concentration polarization (ICP), a membrane surface was tethered with poly(ethylene glycol) methacrylate (PEGMA). Characterization by attenuated total reflection–Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy analysis, and field emission scanning electron microscopy indicated the successful tethering of PEGMA onto the membrane. The antifouling and antichlorine characteristics were assessed in reverse osmosis (RO) and forward osmosis (FO) processes. The water flux increased obviously to 85.00 from 60.00 L m −2 h −1 (LMH) in the RO process; the chlorine stability of the modified membrane was improved. The greatly reduced structural parameters indicated that the ICP of the FO membrane was successfully alleviated; the water flux decreased greatly for the original membrane from 3.40 to 0.01 LMH, whereas it fell only slightly from 10.99 to 9.32 LMH for the modified membrane during synthetic sewage treatment. The ICP was greatly mitigated; the antichlorine performances and the antifouling characteristics drastically improved after grafting with PEGMA. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47406.
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
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2025
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IF 9
Yu Zhang,Yuran Li,Yuting Lin,Xingfei Song,Fabing Su,Tingyu Zhu
To improve the activity of COS hydrolysis catalysts in a complex atmosphere is a significant challenge for blast furnace gas purification. Alumina-based hydrolysis catalysts were prepared with four alkali/alkaline earth metals (Na, K, Mg and Ca) respectively by the simple impregnation method to explore the chlorine-resistance mechanism of catalysts. Among four catalysts, Na/Al 2 O 3 and K/Al 2 O 3 catalysts showed a higher hydrolysis conversion of COS reaching 98 % for 12 h in the absence of HCl, due to the higher contents of weak basic sites as active sites for COS adsorption and more migratory oxygen species participating in COS hydrolysis. Especially, K/Al 2 O 3 has the highest catalytic activity in that it is easy to adsorb COS and H 2 O due to their high absolute adsorption energy. The presence of HCl inhibits the hydrolysis of COS owing to the acidification of active components and competitive adsorption with COS and H 2 O. It has been further found that HCl also inhibits the migration of oxygen species and deposition of sulfur species, but HCl still has a stronger inhibitory effect on COS hydrolysis than the deposition of sulfur species. The introduction of alkali metal as sacrificial sites protects the structure of alumina-based catalysts, avoiding the combination of HCl and Al-O to generate Al-Cl. Na/Al 2 O 3 has the best Cl-resistance mainly due to the high content of medium basic sites and great bond energy of Na-O with HCl. This research offers valuable guidance for the rational design and preparation of alumina-based catalysts with a good Cl-resistance and for the applications of blast furnace gas purification.
研究领域:
化学工程
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环境科学
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催化材料
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产品关联
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Mengni Ge,Zhuohui Jia,Yan Yang,Ping Dong,Chao Peng,Xi Zhang,Raf Dewil,Yan Zhao,Bart Van der Bruggen,Jianfeng Zhang
Although thin-film nanocomposite (TFN) membranes have been proposed as a competitive approach for improved reverse osmosis performance within the last decade, their intrinsically poor organic-inorganic interfacial compatibility and low durability still hinder further upscaling. In this study, a new in situ assembly strategy is proposed to solve this dilemma by using polypyrrole (PPy) to build a bridge between polyamide matrix and nanomaterial (graphitic carbon nitride, g-C 3 N 4 ) and further fabricate g-C 3 N 4 /PPy-incorporated TFN membrane. The synthesized g-C 3 N 4 /PPy nanocomposites are hybridized into the interfacial polymerization process, which endows the TFN membrane with a smaller “ridge-valley”, higher hydrophilic and thinner polyamide layer. With 0.005 wt% of g-C 3 N 4 /PPy, the water permeability of TFN membrane is increased to 377 % (4.0 L·m −2 ·h −1 ·bar −1 ), while keeping a similar NaCl rejection (99.1 %) to pure polyamide membrane. Importantly, the resulting TFN membrane exhibits high chlorine resistance in acidic, neutral and alkaline environments . Moreover, the TFN membrane has superior antifouling performance for organic, inorganic and mixed organic-inorganic foulants, which is of vital importance for the long service life of TFN membranes. This study offers a facile avenue to solve the application needs of advanced TFN membranes for efficient desalination with stable high-quality water.
研究领域:
材料科学
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化学工程
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环境科学
✓ 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）