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Fabrication of Chitosan Nanofiltration Membranes by the Film Casting Strategy for Effective Removal of Dyes/Salts in Textile Wastewater
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-02-03 , DOI: 10.1021/acssuschemeng.9b07026 Qingwu Long 1, 2, 3 , Zhe Zhang 4 , Guangxian Qi 5 , Zhu Wang 1 , Yibo Chen 1 , Zhao-Qing Liu 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-02-03 , DOI: 10.1021/acssuschemeng.9b07026 Qingwu Long 1, 2, 3 , Zhe Zhang 4 , Guangxian Qi 5 , Zhu Wang 1 , Yibo Chen 1 , Zhao-Qing Liu 1
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The development of facile strategies and techniques to fabricate nanofiltration (NF) membranes with ideal molecular sieving ability has received growing attention in both academia and industry. Chitosan (CS) is deemed to be a promising renewable membrane material. However, the scalable and low-cost fabrication of pure CS membranes is severely limited by their poor solubility in organic solvents. Herein, a simple and effective film casting strategy is presented to prepare a positively charged CS-based NF membrane for effective rejection of dye and salt in textile wastewater. The penetration performance of CS membranes can be elaborately tuned by regulating the casting parameters during the fabrication process. The as-synthesized CS membranes with suitable thickness and tensile strength exhibit considerable water permeance and high rejection rates of up to 94.8% for CaCl2 and 87.8% for MgSO4. Especially, the CS membrane with a molecular size cutoff of 5.015 Å (hydrated radius) shows an ultrahigh rejection rate of >99% to six kinds of conventional dyes in textile wastewater. The long-time evaluation of dye and salt separation demonstrates the superior stability of the CS membrane. This work aims to develop a facile and cost-effective solution to construct CS NF membranes with superhigh filtration capacity for dye and salt removal from actual textile wastewater.
中文翻译：
薄膜浇铸策略制备壳聚糖纳滤膜可有效去除纺织品废水中的染料/盐
制造具有理想分子筛分能力的纳滤（NF）膜的简便策略和技术的发展，在学术界和工业界都越来越受到关注。壳聚糖（CS）被认为是一种有前途的可再生膜材料。但是，纯CS膜的可扩展性和低成本制造受到其在有机溶剂中不良溶解性的严重限制。在这里，提出了一种简单有效的薄膜流延策略来制备带正电荷的基于CS的NF膜，以有效去除纺织废水中的染料和盐分。CS膜的渗透性能可以通过在制造过程中调节浇铸参数来精确调整。MgSO 4为2和87.8％。尤其是，截留分子量为5.015Å（水合半径）的CS膜对纺织废水中的六种常规染料显示出超过99％的超高排斥率。对染料和盐分分离的长期评估表明，CS膜具有出色的稳定性。这项工作旨在开发一种简便且经济高效的解决方案，以构建具有超高过滤能力的CS NF膜，以从实际的纺织废水中去除染料和盐。
更新日期：2020-02-03
中文翻译：
薄膜浇铸策略制备壳聚糖纳滤膜可有效去除纺织品废水中的染料/盐
制造具有理想分子筛分能力的纳滤（NF）膜的简便策略和技术的发展，在学术界和工业界都越来越受到关注。壳聚糖（CS）被认为是一种有前途的可再生膜材料。但是，纯CS膜的可扩展性和低成本制造受到其在有机溶剂中不良溶解性的严重限制。在这里，提出了一种简单有效的薄膜流延策略来制备带正电荷的基于CS的NF膜，以有效去除纺织废水中的染料和盐分。CS膜的渗透性能可以通过在制造过程中调节浇铸参数来精确调整。MgSO 4为2和87.8％。尤其是，截留分子量为5.015Å（水合半径）的CS膜对纺织废水中的六种常规染料显示出超过99％的超高排斥率。对染料和盐分分离的长期评估表明，CS膜具有出色的稳定性。这项工作旨在开发一种简便且经济高效的解决方案，以构建具有超高过滤能力的CS NF膜，以从实际的纺织废水中去除染料和盐。
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