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| 1 | Polyethersulfone-polyvinylpyrrolidone composite membranes: Effects of polyvinylpyrrolidone content and polydopamine coating on membrane morphology, structure and performances显示文摘Hydrophilic modification is a promising method to inhibit fouling formation on ultrafiltration membrane.In this work,different mass concentrations(1%–16%)of hydrophilic polyvinylpyrrolidone were incorporated into polyethersulfone(PES)membranes fabricated by none-solvent induced phase separation.Then,polydopamine(PDA)coating on the surface of prepared membrane was carried out at pH 8.5.The morphology and structure,surface hydrophilicity,permeation flux,BSA rejection,antifouling and stability performances of PES and PDA/PES modified membranes were investigated in detail.The results indicated that PDA was successfully attached onto the membranes.Membrane hydrophilicity was evaluated by water contact angle measurement.The contact angles of modified membranes reduced remarkably,suggesting that the membrane hydrophilicities were significantly increased.The results of filtration tests,which were done by dead-end filtration of bovine serum albumin solution,showed that the properties of permeability and fouling resistance were obviously improved by PDA modification.When polyvinylpyrrolidone mass content reached 10%,flux recovery ratio of modified membrane was up to91.23%,and its BSA rejection were over 70%.The results of stability tests showed that the modified membranes had good mechanical stability and chemical stability.This facile fabrication procedure and outstanding performances suggested that the modified membranes had a potential in treating fouling. | Yanna Wu Jianxian Zeng Yajie Zeng Hu Zhou Guoqing Liu Jian Jian Jie Ding | 2021 | Chinese Journal of Chemical Engineering2021，34，10： | 1 |
| 2 | 聚乙二醇增强的竹醋酸纤维素膜材料制备及其性能显示文摘选用中国西南地区特色大型竹材巨龙竹为原料,提取巨龙竹纤维素(BC),乙酸酐为乙酰剂,浓硫酸为催化剂,反应取得巨龙竹醋酸纤维素(BCA),制备竹醋酸纤维素基膜材料,再以无毒、无刺激性的增塑剂聚乙二醇(PEG 200)为添加剂,制备醋酸纤维素-聚乙二醇复合膜材料,并通过扫描电镜、红外光谱、拉伸性能、接触角等分析方法,研究聚乙二醇增强后膜材料的性能。结果表明:巨龙竹纤维素纯度93. 46%;醋酸纤维素乙酰基含量48. 54%,取代度1. 99;醋酸纤维素-聚乙二醇复合膜中PEG成功负载且没有改变醋酸纤维素本身结构;复合膜内部结构更为致密;拉伸强度提高了13. 42%,断裂伸长率提高了114. 76%;复合膜紫外光阻隔效果比基膜好;接触角由基膜的93°降低到复合膜的28°,亲水性大幅增加;加入PEG后材料热稳定性稍降低。 | 石纯 杨静 杨海艳 邓佳 辉朝茂 张加研 郑志峰 史正军 | 2018 | 竹子学报2018，37，3： | 0 |
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