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Preparation of poly(vinyl alcohol)/polydopamine-graphitic carbon nitride nanocomposite membranes for pervaporation dehydration

Authors： Wang Jie, Chen Ming, Li Meisheng, Zhou Shouyong, Zhao Yijiang, Zhong Jing

Units： 1. School of Chemistry and Chemical Engineering, Huaiyin Normal University, Jiangsu Province Environmental Functional Materials Engineering Laboratory, Huaian 223300; 2. College of Chemistry and Chemical Engineering, Changzhou University, Changzhou 213164.

KeyWords： pervaporation dehydration, water-selective, nanocomposite membrane, PDA@g-C3N4, poly(vinyl alcohol)

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2018,38(2):37-44

Abstract：

Highly water-selective hybrid membranes with excellent water/ethanol separation performance and superior water channels were fabricated by incorporating polydopamine modified g-C3N4 nanosheets (PDA@g-C3N4) into a poly(vinyl alcohol) (PVA) matrix. Due to the strong interfacial interactions among dopamine (DA), g-C3N4, succinic acid (Sa) and the PVA matrix, the hybrid nanocomposite membranes showed both high swelling resistance and mechanical stability. Furthermore, the addition of PDA@g-C3N4 can significantly improve the membrane’s hydrophilicity and heat-resistance properties. Importantly, membrane permeability improved greatly because the ordered alignment and the regular pore structure of g-C3N4 resulted in ordered water channels for rapid transportation of water molecules. The total flux and separation factor of this new membrane can reach about 3415 g/(m2h), and 37.5 for 90% wt. % ethanol, respectively. Compared with the cross-linked pure PVA membrane (2337 g/(m2h) and 11.2), the flux and separation factor can be improved simultaneously. Namely, the composite membrane can break the “trade-off effect” effectively. The contact angle of the membrane was reduced to 42.9 °, the mechanical strength was reached up to 40.19 MPa, and the tensile modulus was 448.61 MPa, which was further tested by the hydrophobicity and mechanical strength of the membrane.

Funds：

国家自然科学基金(No. 21406082, 21476094)，江苏省自然科学基金(BK20171268)，淮安市科技支撑项目(HAG201609)，江苏省高校“青蓝工程”资助项目

AuthorIntro：

第一作者简介：王杰(1991-)，男，江苏淮安人，硕士研究生，从事分离膜制备与应用研究，Email：lhswj2013@sina.com 通讯联系人：李梅生（1980-），男，博士，副教授，Email：lms1108@hytc.edu.cn；赵宜江(1968-)，男，博士，教授，Email：cyjzhao@yahoo.com.

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