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聚乙烯醇/聚多巴胺-氮化碳渗透汽化复合膜的制备

作者：王杰，陈明，李梅生，周守勇，赵宜江，钟璟

单位： 1.淮阴师范学院化学化工学院，江苏省环境功能材料工程实验室，江苏淮安 223300；2. 常州大学石油化工学院，江苏常州 213164

关键词：渗透汽化脱水；水选择性；纳米复合膜；多巴胺改性氮化碳；聚乙烯醇

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2018,38(2):37-44

摘要：

采用多巴胺改性氮化碳(PDA@g-C3N4)添加到聚乙烯醇(PVA)中制备出具有优异的乙醇/水分离性能和水分子通道的高度选择性有机-无机杂化膜。通过扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)和X射线衍射(XRD)等对形成的超细纳米孔氮化碳结构进行表征。由于多巴胺(DA)、氮化碳、琥珀酸(Sa)和聚乙烯醇之间具有相互作用，使得纳米复合膜具有抗溶胀性和机械性能稳定性。此外，多巴胺改性氮化碳的加入，也可以进一步的提高膜的亲水性和热稳定性。杂化膜(CPVA-PDA@g-C3N4/PAN)的总渗透通量和分离因子可以达到3415 g/(m2h)和37.5，和交联的纯聚乙烯醇膜(CPVA) (通量和分离因子为2337 g/(m2h)和11.2)相比较而言，该膜可以同时有效的提高杂化膜的分离性能，也就是我们所说的打破了“trade-off”效应。对该膜的亲疏水性和机械强度进一步测试可知，膜的接触角下降到42.9°，拉伸强度达到了40.19 MPa，弹性模量为448.61 MPa。

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.

基金项目：

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

作者简介：

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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