Membranes
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2018
·Vol. 8
·期 4
·89
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IF 0
Qin Liu,Xing Wu,Kaisong Zhang
To improve the filtration performance and properties of organic solvent nanofiltration (OSN) membranes, we firstly introduce nanoporous silica (SiO2) particles into the polyamide (PA) active layer of polysulfone (PSf) membrane via an interfacial polymerization process. Results from the study revealed that introduction of SiO2influenced the properties of PSf/PA-SiO2composite membranes by changing the surface roughness and hydrophilicity. Moreover, results also indicated that nanoporous SiO2modified membranes showed an improved performance of alcohols solvent permeance. The PSf/PA-SiO2composite membrane modified by 0.025 wt % of SiO2reached a permeance of 3.29 L m−2h−1bar−1for methanol and 0.42 L m−2h−1bar−1for ethanol, which were 20.0% and 13.5% higher than the control PSf membrane (permeance of 2.74 L m−2h−1bar−1for methanol and 0.37 L m−2h−1bar−1for ethanol). Conclusively, we demonstrated that the increase of membrane hydrophilicity and roughness were major factors contributing to the improved alcohols solvent permeance of the membranes.Keywords:silica;polysulfone;composite membrane;polyamide
研究领域:
材料科学
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化学工程
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DOI
PubMed
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 23
·4659
·
IF 2.468
Zhen Shen,Wei Chen,Hang Xu,Wen Yang,Qing Kong,Ao Wang,Mingmei Ding,Juan Shang
Membrane fouling is still a critical issue for the application of ultrafiltration, which has been widely used in water treatment due to its efficiency and simplicity. In order to improve the antifouling property, a new 2D material MXene was used to fabricate composite ultrafiltration membrane with the approach of in situ embedment during the phase inversion process in this study. Scanning electron microscopy (SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), water contact angle, bovine serum albumin rejection and porosity measurements were utilized to characterize the prepared membranes. Due to the hydrophilicity of the MXene, the composite membranes obtained higher hydrophilicity, confirmed by the decreased water contact angle. All the modified membranes had a high bovine serum albumin rejection above 90% while that of the pristine polysulfone membrane was 77.48%. The flux recovery ratio and the reversible fouling ratio of the membranes were also improved along with the increasing content of the MXene. Furthermore, the highest flux recovery ratio could also reach 76.1%. These indicated the good antifouling properties of MXene composite membranes. The enhanced water permeability and protein rejection and excellent antifouling properties make MXene a promising material for antifouling membrane modification.Keywords:MXene (Ti3C2Tx);polysulfone;hydrophilicity;ultrafiltration membrane;antifouling
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
Journal of Water Process Engineering
·
2022
·
IF 7.34
Christine N. Matindi,Sania Kadanyo,Gansheng Liu,Mengyang Hu,Yunxia Hu,Zhenyu Cui,Xiaohua Ma,Feng Yan,Benqiao He,Jianxin Li
Polyethersulphone/sulfonated polysulfone/TiO 2 (PES/SPSf/TiO 2 ) ultrafiltration (UF) mixed matrix membranes (MMMs) were coated with a hybrid layer composed of branched polyethyleneimine (PEI) and TiO 2 nanoparticles (NPs) crosslinked by glutaraldehyde (GA) to enhance its stability. The effect of TiO 2 NPs loadings on the thickness, surface wettability , surface charge and molecular weight cut-off (MWCO) was explored. The corresponding MWCO decreased from 96 kDa for the pristine PES/SPSf/TiO 2 MMM (M0) to 8.5 kDa for PEI-GA@MMMs (M1), and then gradually increased to the range of 15 kDa–40 kDa for PEI-TiO 2 /GA@MMMs. TiO 2 NPs having abundant –OH groups also increased electronegativity and hydrophilicity of the composite membranes. At neutral pH, the zeta potential changed from negative charge of MMMs (−33 mV) into positive charge of M1 (1.3 mV), then into negative charge (−7.4 mV) in the optimum hybrid coated membrane PEI-TiO 2 (0.025 wt%)/GA@MMMs (M3). The underwater oil contact angle (UWOCA) of with hexane , gasoline, dichloromethane and petroleum ether was 165°, 167°, 164° and 135°, respectively. The air/water contact angle (WCA) of M3 was 42°, which is lower than that of M1 (63°). It is important to note that M3 demonstrated a high rejection of different oil-in-water emulsions with <300 nm oil droplets (>90 %) and an improved pure water permeance of 62 LMH bar −1 compared to 44 LMH bar −1 of M1. M3 also exhibited double the antifouling rates of M1 hence corroborating wettability and surface charge results. In summary, our current study provides an available tuning approach to engineering membranes for the treatment of oil-in-water emulsions containing nano-sized oil droplets.
研究领域:
材料科学
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环境工程
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膜技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Jichao Wang,Jiayu Tian,Shanshan Gao,Wenxin Shi,Fuyi Cui
The low reactivity and poor compatibility of hydrophobic polymer base with hydrophilic additives poses a challenge for preparation of antifouling ultrafiltration (UF) membrane. In this work, the allyloxy nonylphenoxy propanol polyoxyethylene (SE-10N) ether ammonium sulfate (AHPS), which possessing excellent reactivity and amphiphilicity, was grafted onto PES membrane surface via dopamine triggered one-step polymerization and co-deposition process. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed that AHPS was easily anchored onto the membrane surface with the assistance of dopamine. Field emitting scanning electron microscope (FESEM) and atomic force microscopy (AFM) also demonstrated the formation of a new coating on membrane surface. The modified layer significantly enhanced the hydrophilicity of the ultrafiltration membrane, as confirmed by the decrease of contact angle from 77.2° to 55.8°. As a result, the modified membrane exhibited remarkably improved anti-fouling properties. The static adsorption of bovine albumin (BSA) on membrane surface was decreased from 77.2 to 34.3 µg/cm 2 . Furthermore, the modified membrane displayed higher flux recovery (95.9%) and fouling reversibility (51.6%) than unmodified membrane (56.7% and 23.0%, respectively). Besides, the modified membrane also showed better structural stability in acid and alkali solutions as compared with pure polydopamine coated membrane. Therefore, this study provided a facile approach for improving the anti-fouling performance of membranes.
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
GREEN CHEMISTRY
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2011
·Vol. 14
·期 1
·130-135
·
IF 5.472
Bin Li,An-Hua Liu,Liang-Nian He,Zhen-Zhen Yang,Jian Gao,Kai-Hong Chen
Readily available iron compounds were found to be active catalysts for the selective oxidation of sulfide to sulfoxide with molecular oxygen as the oxidant in polyethylene glycol (PEG). As an indispensable component, PEG had a great promotive effect on the reaction. Notably, high conversion (>99%) along with excellent chemo-selectivity of up to 94% could be attained by using Fe(acac)2 as the catalyst at 100 °C. This methodology was proved to be applicable for the transformation of various aromatic and aliphatic sulfides into the corresponding sulfoxides with high selectivity. PEG is considered to play a crucial role in stablizing the Fe(IV)-oxo species formed in situ which is supposed to be responsible for the sulfide oxidation.
研究领域:
有机化学
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催化化学
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DOI
高影响因子
HIGH PERFORMANCE POLYMERS
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2018
·
IF 1.047
Jingting Wang,Yanfeng Wei,Xuesong Li,Jianxin Mu
A series of novel poly(aryl ether sulfone)s (PESs) with polyhedral oligomeric silsesquioxane (POSS) and biphenyl group in the main chain were synthesized from 4,4′-biphenol, biphenol POSS and 4,4′-bis[(4-chlorophenyl)sulfonyl]-1,1′-biphenyl via a nucleophilic aromatic substitution polycondensation. The structures of the polymers were characterized by infrared, nuclear magnetic resonance, and wide-angle X-ray diffraction spectroscopy. The incorporation of POSS and biphenyl group into PES matrix at various molar percentages of POSS resulted in a dramatic decrease of dielectric constant as well as a significant increase of hydrophobicity. As the content of POSS increased, the dielectric constant decreased from 2.54 to 1.82, while the contact angle can be increased to 122.6°. The thermal properties, crystallinity, solvent resistance, and surface topography were also studied in this article.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Lin Xu,Qin Cai,Xueqin He,Xianda Liu,Guodong Dang,Weifeng Zhao,Changsheng Zhao
The decline of renal function for the patients with end-stage kidney disease (ESKD) leads to the loss of uric acid excretion , which may reduce the prognosis of patients and increase mortality. Although hemodialysis could remove most uric acid , the long-term hemodialysis patients commonly face the problems of exacerbating oxidative stress and subsequent complications such as inflammation effects. In this work, urate oxidase-like (UOD-like) nanoenzyme is added to the blood side of polyethersulfone (PES) hemodialysis membrane by a simple double-casting phase inversion method, aiming to simultaneously achieve antioxidation and scavenge uric acid. The results demonstrate that the Janus PES/UOD membrane exhibits the ability to scavenge RNS (ABTS + , 59.75 %) and ROS (H 2 O 2 , 97.76 %; OH, 74.45 %), while efficiently clears 54.62 % uric acid. In addition, the membrane has good blood compatibility and does not cause hemolysis, complement activation , or coagulation. Furthermore, the membrane exhibits the water flux of 56.83 mL/m 2 ·h·mmHg, the urea clearance ratio of 95.33 %, and the BSA retention ratio of 99 %. Overall, we develop a promising hemodialysis membrane with antioxidant, and it opens a new route to fabricate multifunctional hemodialysis membranes.
研究领域:
生物医学工程
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材料科学
·
肾脏病学
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产品关联
DOI
高影响因子
npj Clean Water
·
2024
·Vol. 7
·期 1
·1-15
·
IF 10.4
Wu Zhuobin,Zheng Ke,Zhang Guichang,Huang Longwei,Zhou Shaoqi
Membrane distillation is an emerging wastewater treatment technology that harnesses low-grade heat as an energy source and exhibits potential for complete desalination. Nonetheless, two notable challenges hinder the practical application of this technology: membrane wetting and fouling. To counter these challenges, an innovative anti-fouling Janus membrane with asymmetric wettability was developed through electrospinning. The hydrophobic layer was formed using tetraethyl orthosilicate/polysulfone (PSF), and the superhydrophilic layer was created using polyvinylpyrrolidone (PVP)/PSF. A sensitive adhesion probe was used to assess the anti-fouling performance of the Janus membrane against oil. Molecular dynamics simulation suggested that PVP reduced the adsorption tendency of the membrane for humic acid (HA). Under experimental conditions involving saline water with HA and a saline oil–water emulsion, the non-Janus membrane suffered severe fouling, resulting in rapid water permeate flux decline. However, the Janus membrane demonstrated consistent permeate flux (26.84 LMH and 24.92 LMH) and an impressive salt rejection rate (> 99.99%). This study suggests that the Janus membrane, with its high permeate fluxes and remarkable resistance to fouling and wetting, could be an effective solution for wastewater treatment, with considerable potential for future 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
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Mengqi Shi,Zhi Wang,Song Zhao,Jixiao Wang,Peng Zhang,Xingzhong Cao
We report a novel pathway for preparing polyamide (PA) thin-film composite (TFC) reverse osmosis (RO) membrane with high permselectivity by incorporating tannic acid (TA) into the polysulfone (PSf) support. The support and RO membrane were characterized systematically. The results showed that (1) the support surface was enriched with TA due to the high hydrophilcity of TA and (2) TA endowed the RO membrane with a thinner and more compact PA active layer. The influencing mechanism of TA on the PA layer formation was discussed. TA affected the formation of PA layer through changing the m-phenylenediamine (MPD) molecules absorption behavior and the formation of the nascent film. The RO membrane desalination performances for both brackish water and seawater were evaluated. Due to the thinner and more compact PA active layer, PSf/TA-RO (the membrane prepared on PSf/TA support) possessed a higher rejection and a comparative flux compared to PSf-RO (the membrane prepared on PSf support). This work provides an effective way for preparing high performance RO membranes via utilizing support to tailor the aqueous phase monomer absorption and the formation of the nascent film.
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
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·
IF 1.911
Hao Yang,Jiemei Zhou,Zhaogen Wang,Xiansong Shi,Yong Wang
Fouling resistance of ultrafiltration (UF) membranes is critical for their long-term usages in terms of stable performance, so convenient approaches to prepare fouling-resistant membranes are always anticipated. Herein, we demonstrate the facile fabrication of antifouling polysulfone- block -poly(ethylene glycol) (PSF- b -PEG, SFEG) composite membranes. SFEG layer was coated onto macroporous supports and cavitated by immerging them in acetone/ n -propanol following the mechanism of selective swelling induced pore generation. Thus-produced SFEG membranes possessed high permeance and excellent mechanical strength. Meanwhile, the structures and separation performances of the SFEG layers can be continuously tuned through simply changing swelling durations. More importantly, the hydrophilic PEG chains were spontaneously enriched onto the pore walls through swelling treatment, endowing intrinsic antifouling property to the SFEG membranes. Bovine serum albumin (BSA)/humic acid (HA) fouling tests proved the prominent fouling resistance of SFEG membranes, and the fouling resistance is expected to be long-standing because of the firm connection between PEG chains and PSF matrix by covalent bonding.
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
LANGMUIR
·
2019
·
IF 3.683
Yanxia Wei,Linli Hu,Jinrong Yao,Zhengzhong Shao,Xin Chen
The conformation and stability of zein in solution are closely associated with its solvation process and influence the mechanical properties of the related zein-based materials. In this work, a common solvent dimethyl sulfoxide (DMSO) was used to dissolve zein, rather than solvents frequently used such as aqueous ethanol and acetic acid. It was found that DMSO could dissolve zein readily and the solution was stable for at least 2 weeks. Rheological analysis and small-angle X-ray scattering (SAXS) were employed to characterize the zein DMSO solution. Results of rheological analysis suggested a Huggins coefficient of 0.24, indicating DMSO to be a good solvent for zein. SAXS results revealed that zein adopted an elongated conformation and had dimensions of 2.8 nm × 2.8 nm × 14.8 nm in DMSO solution. Moreover, robust zein films were fabricated from zein DMSO solutions. The content of residual DMSO in the films was determined to be approximately 15 wt % by thermogravimetric analysis, in consistence with the value obtained by other two methods. The film showed a large breaking strain of 320.6% with a considerable breaking stress of 1.9 MPa, yielding a breaking energy of 376.2 MJ/m3. Therefore, the ease of dissolution and good mechanical performance of the final zein-based material make DMSO a potential solvent for fabrication of zein materials, thereby improving the scope of practical applications of zein.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2014
·
IF 1.552
Wenju Wang,Huiling Li,Junli Ren,Runcang Sun,Jie Zheng,Guangwei Sun,Shijie Liu
An efficient homogeneous catalytic process was developed for the dehydration of xylose to furfural using inorganic salts as catalysts in a water/dimethyl sulfoxide (DMSO) system under mild condition. The effects of the types of inorganic salts were compared. The results showed that chlorides had higher catalytic performance than other salts, and SnCl 4 was the most effective chloride. The catalytic activity of paired SnCl 4 /LiCl catalysts was much higher than that of the single salt, and when the distribution coefficient ( χ SnCl4 ) was 0.8, the maximum furfural yield was 56.9%. The effects of the reaction conditions on the furfural yield were also investigated. The highest furfural yield, 63.0%, was achieved at 130 °C for 6 h under the optimized reaction conditions.
研究领域:
化学工程
·
生物化工
✓ 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）