层状Mg/Al氢氧化物/聚乙烯醇复合膜的制备及染料截留性能的研究  

Fabrication and dye separation performance study of layered Mg/Al hydroxide/polyvinyl alcohol composite membrane

作　　者：张杰[1] 刘壮[1,2] 巨晓洁 谢锐[1,2] 汪伟[1,2] 褚良银 ZHANG Jie;LIU Zhuang;JU Xiaojie;XIE Rui;WANG Wei;CHU Liangyin(School of Chemical Engineering,Sichuan University,Chengdu 610065,Sichuan,China;State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]四川大学高分子材料工程国家重点实验室,四川成都610065

出　　处：《化工学报》2021年第9期4941-4949,共9页CIESC Journal

基　　金：国家自然科学基金项目(22022810,21776182)。

摘　　要：二维膜因其可控的结构和通道特有的物理化学性质,在气体分离、海水淡化、污水处理等诸多分离领域展现出巨大的应用潜力。通过层状Mg/Al氢氧化物(LDH)单片与聚乙烯醇(PVA)高分子链之间的氢键相互作用,层层堆叠构建了PVA/LDH复合膜。利用SEM、XRD考察了PVA与LDH的配比对于复合膜层状结构与层间距高度的影响规律。考察了PVA/LDH复合膜的纯水通量及染料模型分子的截留率。结果表明,不同PVA混合量的复合膜断面都具有层状结构。由于氢键作用导致复合膜较之于纯LDH膜的层间距有所缩小,随着PVA含量增加复合膜层间距先减小后增加;在PVA含量为15%时达到最小值,PVA含量超过15%后复合膜层间距有所增加。不同比例复合膜,以PVA质量分数为25%的复合膜的纯水通量最大;同时,该复合膜对分子量在300-800的染料分子具有优异的截留性能,截留率均超过97%。该工作为PVA/LDH复合膜在印染废水处理提供了新思路。Due to its controllable structure and unique physical and chemical properties of the channel,the two dimensional membrane has shown great application potential in many separation fields such as gas separation,seawater desalination,and sewage treatment.In this paper,the PVA/LDH composite membrane is constructed by layers stacking,in which layered Mg/Al hydroxide(LDH)monolayer and polyvinyl alcohol(PVA)polymer chain form hydrogen bond interaction.The effects of the ratio of PVA to LDH on the lamellar structure and the height of the lamellar spacing of the composite membranes are investigated by SEM and XRD.The water flux and dyes rejection of PVA/LDH composite membranes are investigated.The results show that the cross-sections of the composite membranes with different PVA mass fractions have lamellar structures.Compared with the LDH membrane,the interlayer spacing of the composite membranes is decreased due to the hydrogen bonding interaction.With the increase of PVA content,the interlayer spacing of the composite membranes decreased firstly and then increased,in which the content of PVA is 15%,the value of spacing is minimum,while the content of PVA exceeds 15%,the interlayer spacing increased.The pure water flux of the composite membrane with a PVA mass fraction of 25%is the largest.The composite membrane has excellent rejection performance for the molecular weight of dye molecules in the range of 300-800,and the rejection rate is more than 97%.This work provides a novel path for the treatment of printing and dyeing wastewater.

关 键 词：膜 二维材料 复合材料 废水 

分 类 号：TQ028.8[化学工程]