JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 9
·
IF 1.768
Fang Qiu,Minle Peng,Zhimei Wei,Xiaojun Wang,Jie Yang
A novel kind of sulfonated polyethersulfonephenylethane (SPESPE) was successfully synthesized firstly in this work. Then the SPESPE was introduced in polyethersulfone (PES) microspheres prepared by the electrospraying technique. The microspheres were applied to adsorbing bisphenol A (BPA) from its aqueous solution. Compared with the PES microspheres, the adsorption capacity of PES/SPESPE microspheres for BPA was increased significantly. Furthermore, the adsorption capacity of PES/SPESPE microspheres was enhanced by increasing the amounts of SPESPE in the microspheres. The pH of solution had influence on the adsorption capacity of PES/SPESPE microspheres. The kinetic data of adsorption were found to follow pseudo-second-order model. The Freundlich isotherm model was suitable to describe the equilibrium adsorption data. The microspheres also showed excellent regeneration and reuse ability. These results indicated that the PES/SPESPE microspheres have the potential to be used in environmental application. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43066.
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
CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 35
·期 7
·846-856
·
IF 1.692
Liang Hong-qing,Li Hao-nan,Yu Hao-hao,Zhou Yong-ting,Xu Zhi-kang
Polysulfone (PSF) membranes have gained great attention in the fields of ultrafiltration, microfiltration, and thin film composite membranes for nanofiltration or reverse osmosis. For the first time, it is proposed to fabricate PSF membranes via thermally induced phase separation (TIPS) process using diphenyl sulfone (DPSO2) and polyethylene glycol (PEG) as mixed diluent. DPSO2 is chosen as a crystallizable diluent, while PEG is considered in terms of molecular weight ( M
w ) and dosage. We systematically investigate the interactions between PSF, DPSO2 and PEG based on the simulation calculations and solubility parameter theory. It is inferred that DPSO2 has an excellent compatibility with PSF, and the addition of PEG results in the ternary system thermodynamically less stable and then facilitates its liquid-liquid (L-L) phase separation. SEM images indicate that cellular-like pores are obvious throughout the membrane when the PEG content in the mixed diluent is 25 wt%−35 wt%. We can facilely manipulate the pore size, water flux and mechanical properties of PSF membranes with the dosage of PEG-200, the M
w
of PEG or the cooling rate. The successful application of TIPS can provide a new approach for structure manipulation and performance enhancement of PSF membranes.
研究领域:
材料科学
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膜技术
✓ 已验证
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 6
·686
·
IF 2.935
Li-Fen Liu,Xing-Ling Gu,Xin Xie,Rui-Han Li,Chun-Yang Yu,Xiao-Xiao Song,Cong-Jie Gao
In this study, modification of polysulfone (PSf)/sulfonated polysulfone (SPSf) blended porous ultrafiltration (UF) support membranes was proposed to improve the reverse osmosis (RO) performance of aromatic polyamide thin film composite (TFC) membranes. The synergistic effects of solvent, polymer concentration, and SPSf doping content in the casting solution were investigated systematically on the properties of both porous supports and RO membranes. SEM and AFM were combined to characterize the physical properties of the membranes, including surface pore natures (porosity, mean pore radius), surface morphology, and section structure. A contact angle meter was used to analyze the membrane surface hydrophilicity. Permeate experiments were carried out to evaluate the separation performances of the membranes. The results showed that the PSf/SPSf blended porous support modified with 6 wt % SPSf in the presence of DMF and 14 wt % PSf had higher porosity, bigger pore diameter, and a rougher and more hydrophilic surface, which was more beneficial for fabrication of a polyamide TFC membrane with favorable reverse osmosis performance. This modified PSf/SPSf support endowed the RO membrane with a more hydrophilic surface, higher water flux (about 1.2 times), as well as a slight increase in salt rejection than the nascent PSf support. In a word, this work provides a new facile method to improve the separation performance of polyamide TFC RO membranes via the modification of conventional PSf porous support with SPSf.
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
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Yuanmei Wen,Liaotian Peng,Yang Zhou,Tao Peng,Yu Chen,Xiaoling Cheng,Yongzheng Chen,Jiawei Yang
Here we report a methionine sulfoxide reductase B (MsrB) enzymatic system for the preparation of ( S )-sulfoxides through kinetic resolution of racemic ( rac ) sulfoxides. Eight MsrB homologue recombinant proteins were expressed and their activities on asymmetric reduction of rac -sulfoxides were analyzed. Among these MsrB homologue proteins, one protein from Acidovorax species showed good activity and enantioselectivity towards several aryl-alkyl sulfoxides. The ( S )-sulfoxides were prepared with 93–98% enantiomeric excess through kinetic resolution at initial substrate concentration up to 50 mM. The establishment of MsrB catalytic kinetic resolution system provides a new efficient green strategy for preparation of ( S )-sulfoxides.
研究领域:
生物化学
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合成生物学
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绿色化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanjun Cheng,Huiying Ding,Yuting Liu,Di He,Lu Elfa Peng,Hideto Matsuyama,Mengyang Hu,Xianhui Li
Nanofiltration (NF) membranes have a high removal rate for pharmaceutical and personal care products (PPCPs) in drinking water, but they also reject critical minerals (e.g., calcium and magnesium) that are beneficial to health. Herein, polyethersulfone (PES)/sulfonated polysulfone (SPSf) loose NF membranes were fabricated using non-solvent induced phase separation (NIPS) to enable efficient rejection of PPCPs while preserving high mineral permeability. The resultant loose NF membrane showed increased negative charge owing to the -SO 3 - groups of SPSf. It also exhibited a high water permeance of ∼20.8 L m -2 h −1 bar −1 characterized by high PPCPs/minerals selectivity ( i.e. , rejection of PPCPs > 90 % and rejection of Mg 2+ < 5 %). The filtration performance of resultant membrane indicated that the ionic PPCPs (e.g., Indomethacin, Diclofenac Sodium, Levofloxacin, Norfloxacin) were removed by the electrostatic repulsion and adsorption, while the removal of non-ionic PPCPs (e.g., Bisphenol A, Carbamazepine) was primarily dominated by the synergy of adsorption and size exclusion. Therefore, the superior removal rate of hydrophilic PPCPs was due to enhanced PPCP-membrane adsorptive interaction. This study provides a profound understanding of the selective separation mechanism of loose NF membranes for micropollutants and minerals.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qiaoyu Liang,Shenghuan Wang,Yanhong Ji,Mohammad Younas,Benqiao He
Loose nanofiltration membranes (LNF) have wide applications in the field of precise separation of small organic molecules. However, high separation precision of organic molecules with salts and a high water flux are still the challenges in the commercial applications of LNF membranes. In the current work, polyethersulfone (PES)/hydroxylated polyethersulfone (PES-OH) LNF membranes were synthesized by nonsolvent-induced phase separation (NIPS) based on reactive porogen (butyl dicarbonate, BDC) for the first time. The reactive porogen was decomposed to produce nanobubbles during heat-treated casting solution and phase inversion in HCl coagulation. It was found that the heat-treatment temperature of the casting solution was higher, the viscosity of the solution at 20 °C was higher due to the existence of more nanobubbles from BDC decomposition in the casting solution. Moreover, heat-treatment temperature had decisive impacts on the structure and separation property of the formed LNF membranes as nanobubbles actually acted as pore-forming agents. The HCl coagulation/immersion baths also promoted the BDC decomposition to produce the nanobubbles and improved the transmembrane water flux without sacrificing rejection and separation precision performance. The synthesized LNF membrane had a pore diameter approximately 3.81 nm, with a flux up to 200.2 L·m −2 ·h −1 . Direct Black 38 shows a rejection of > 99 %, whereas NaCl shows a rejection of < 5 %, exhibiting a good separation accuracy and found superior to the separation performance in the literature. This research result has offered a novel approach for the preparation of superior performance LNF membranes, which can be utilized for precise separation.
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 POLYMER SCIENCE
·
2021
·Vol. 60
·期 21
·3009-3021
·
IF 0
Gansheng Liu,Ran Tao,Mengyang Hu,Xiaowei Liu,Christine Matindi,Sania Kadanyo,Rui Chen,Liuyong Mao,Kuanjun Fang,Jianxin Li
Two monomers, positively charged N,N-dimethylaminoethyl methacrylate (DMAEMA) and negatively charged monomer sodium vinylsulfonate (VSA), were employed to generate a zwitterionic copolymer layer on the surface of PES/SPSf blend membrane via UV-light grafting. The effect of monomer concentration and irradiation time on the properties of the modified membranes was studied. Results showed that the degree of grafting (DG) accelerated with the increase in monomer concentration and irradiation time. The zeta potential of the zwitterionic membrane was tailored from negative (−21.4 mV) to positive charge (+30.8 mV) by varying the concentration DMAEMA monomer and irradiation time. Optimized membrane fabrication conditions were 15 g L −1 of DMAEMA and 10 min irradiation time (Mc15). The molecular weight cut-off of Mc15 was calculated to be 40 kDa, while the zeta potential was found to be +8.56 mV (pH = 7). Mc15 showed excellent rejection rates for both positively and negatively charged dyes. In contrast Mc15 maintained low rejection rates for Na 2 SO 4 (<10%) and high dye/salt selective separation performance (retention rates for basic blue 26 and Na 2 SO 4 were 97 and 6.5%) over long continuous operation (50 h). In summary, our study provides tailoring implementation strategies to enhance dye/salt selective separation of tight ultrafiltration membranes. Graphical
研究领域:
材料科学
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膜技术
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环境工程
✓ 已验证
产品关联
DOI
DESALINATION
·
2014
·
IF 3.96
Yuanna Sun,Lixin Xue,Yaojian Zhang,Xiulan Zhao,Yan Huang,Xudong Du
High water flux polyamide thin film composite (TFC) forward osmosis (FO) membranes with porous supporting substrate layers made from polysulfone (PSf) and polyethersulfone (PES) blends of varied PSf/PES ratio were prepared. The impact of PSf/PES ratio on the porous structure of the supporting substrates and resulting properties of TFC-FO membranes formed were investigated. There were three distinguished sections observed in the cross-sections of the substrates, a top dense skin section, a central porous section, and a bottom open section according to SEM images. With the joint favoring effects from maximum open bottom section percentage in the cross-section and maximum surface roughness , membrane samples made from substrates with a PSf/PES ratio of 2/3 exhibit a highest water flux of 27.6 L/m 2 h for 2 M NaCl draw solution from a de-ionized water feed solution. And their water flux reached 12.7 L/m 2 h under PRO mode and 10.6 L/m 2 h under FO mode from an ocean seawater feed solution containing 3.5 wt.% of NaCl. This high flux is related to the existence of heavily populated cone shaped protrusions observed on the surfaces of formed TFC-FO membranes, resulting from amplification in initial surface roughness of the porous substrate during the active layer forming interfacial co-polymerization process.
研究领域:
材料科学
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环境工程
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Quan Zhang,Bochen Pan,Piao Yang,Jin Tian,Shihuan Zhou,Xianlin Xu,Yangxue Dai,Xiaoling Cheng,Yongzheng Chen,Jiawei Yang
Methionine sulfoxide reductase A (MsrA) has emerged as promising biocatalysts in the enantioselective kinetic resolution of racemic ( rac ) sulfoxides . In this study, we engineered robust MsrA variants through directed evolution, demonstrating substantial improvements of thermostability . Mechanism analysis reveals that the enhanced thermostability results from the strengthening of intracellular interactions and increase in molecular compactness. Moreover, these variants demonstrated concurrent improvements in catalytic activities, and notably, these enhancements in stability and activity collectively contributed to a significant improvement in enzyme substrate tolerance. We achieved kinetic resolution on a series of rac -sulfoxides with high enantioselectivity under initial substrate concentrations reaching up to 93.0 g/L, representing a great improvement in the aspect of the substrate concentration for biocatalytic preparation of chiral sulfoxide. Hence, the simultaneously improved thermostability, activity and substrate tolerance of MsrA represent an excellent biocatalyst for the green synthesis of optically pure sulfoxides.
研究领域:
生物化学
·
酶工程
·
合成生物学
✓ 已验证
DOI
PubMed
高影响因子
SOLID STATE IONICS
·
2016
·
IF 2.38
Baohua Yue,Guangbo Zeng,Yepei Zhang,Sheng Tao,Xiaoming Zhang,Liuming Yan
The synergetic proton conducting effect was observed in an acid-base composite composed of phosphonic acid functionalized polysulfone (PSF-PA) and triazolyl functionalized polysulfone (PSF-CH 2 -iPrOHTri), with three orders of magnitude improvement compared to that of the acidic or basic component. The maximum proton conductivity of 42.71 mS cm − 1 at 100 °C and 90% RH was observed in PSF-PA/PSF-CH 2 -iPrOHTri composite membrane composed of 75.0% PSF-CH 2 -iPrOHTri. In addition, the acid-base composite membrane showed higher thermal and oxidative stability , reduced hydrophilicity and methanol permeability , significantly improved mechanical strength . For the hydrated membranes of PSF-PA or PSF-CH 2 -iPrOHTri, the tensile strengths showed significant degradation with values only about halves of the dry membranes. On the other side, the tensile strength of the acid-base composite composed of 75.0% PSF-CH 2 -iPrOHTri showed only slight drop from 35.52 MPa to 30.59 MPa.
研究领域:
材料科学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
Membranes
·
2023
·Vol. 13
·期 9
·759
·
IF 4.2
Fanxin Kong,Lian You,Dingwen Zhang,Guangdong Sun,Jinfu Chen
Polysulfone (PSf) membranes typically have a negligible rejection of salts due to the intrinsic larger pore size and wide pore size distribution. In this work, a facile and scalable heat treatment was proposed to increase the salt rejection. The influence of heat treatment on the structure and performance of PSf membranes was systematically investigated. The average pore size decreased from 9.94 ± 5.5 nm for pristine membranes to 1.18 ± 0.19 nm with the increase in temperature to 50 °C, while the corresponding porosity decreased from 2.07% to 0.13%. Meanwhile, the thickness of the sponge structure decreased from 20.20 to 11.5 μm as the heat treatment temperature increased to 50 °C. The MWCO of PSf decreased from 290,000 Da to 120 Da, whereas the membrane pore size decreased from 5.5 to 0.19 nm. Correspondingly, the water flux decreased from 1545 to 27.24 L·m−2·h−1, while the rejection ratio increased from 3.1% to 74.0% for Na2SO4, from 1.3% to 48.2% for MgSO4, and from 0.6% to 23.8% for NaCl. Meanwhile, mechanism analysis indicated that the water evaporation in the membranes resulted in the shrinkage of the membrane pores and decrease in the average pore size, thus improving the separation performance. In addition, the desalting performance of the heat-treated membranes for real actual industrial wastewater was improved. This provides a facile and scalable route for PSf membrane applications for enhanced desalination.Keywords:PSf membrane;heat treatment;rejection performance
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Hui Qin,Chuangchao Sun,Chao He,Dongsheng Wang,Chong Cheng,Shengqiang Nie,Shudong Sun,Changsheng Zhao
In this paper, we provide a highly efficient, convenient and universal protocol for blood-compatible modification of polyethersulfone (PES) membranes via in situ cross-linked copolymerization of 2-hydroxyethl methacrylate (HEMA) and acrylic acid (AA) in PES solutions. Static water contact angle, protein adsorption, platelet adhesion, and clotting time of the modified PES membranes are systematically studied, and the results indicate that the modified membranes show improved hydrophilicity, good blood anticoagulant and antifouling properties after introducing HEMA and AA. Meanwhile, the modified membranes perform low contact activation and complement activation when they come in contact with blood. The effect of the HEMA/AA ratios on the blood compatibility is also investigated to identify the different roles played by HEMA and AA in the modification; the HEMA could more effectively enhance the membrane antifouling property, while the AA could more effectively improve the anticoagulant property. The results indicated that the blood-compatible PES membranes prepared via the in situ cross-linked copolymerization had potential to be used in the field of blood purification.
研究领域:
材料科学
·
生物医学工程
✓ 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）