2种致孔剂条件下PDA/PVDF超滤膜的微结构及其有机染料截留性能的对比  

Microstructure of PDA/PVDF ultrafiltration membranes under two pore-forming agents and comparison of their retention of organic dyes

作　　者：杨靖 王哲曦 韩丹丹 翟英健 袁傲 YANG Jing;WANG Zhexi;HAN Dandan;ZHAI Yingjian;YUAN Ao(School of Urban Planning and Municipal Engineering,Xi’an Polytechnic University,Xi’an 710048,China;Shaanxi Modern Architectural Design and Research Institute Co.Ltd.,Xi’an 710043,China)

机构地区：[1]西安工程大学城市规划与市政工程学院,陕西西安710048 [2]陕西省现代建筑设计研究院有限公司,陕西西安710043

出　　处：《西安工程大学学报》2024年第6期37-45,共9页Journal of Xi’an Polytechnic University

基　　金：陕西省重点研发计划项目(2024SF-YBXM-573);西安市科技计划项目(23GXFW0023);西安工程大学大学生创新创业训练计划项目(S202310709005)。

摘　　要：为提高聚偏氟乙烯(polyvinylidene fluoride,PVDF)超滤膜对有机染料的抗污染性,以聚多巴胺(polydopamine,PDA)为改性剂,分别以聚乙烯吡咯烷酮(polyvinylpyrrolidone,PVP)、氯化锂(lithium chloride,LiCl)为致孔剂,通过相转化法制备了PDA改性PVDF超滤膜(PDA/PVDF膜),研究对比了PDA质量分数对2种不同致孔剂所制作的PDA/PVDF膜微结构、断裂强度、染料截留率以及抗污染性能的影响,以及PDA/PVDF膜对中性红、活性艳橙K-NG和分散深蓝HGL等3种有机染料溶液的渗透分离性能。结果表明:随着PDA质量分数的增加,膜的孔隙结构得到了改善,添加PVP的PDA/PVDF膜平均孔径明显增大,并且膜的亲水性得到了显著提升,其中添加PVP的PDA/PVDF膜接触角降低了24.6%;PDA的加入可极大提高PDA/PVDF膜纯水通量与染料截留率,以PVP为致孔剂的PDA/PVDF膜纯水通量远大于以LiCl为致孔剂的PDA/PVDF膜,以LiCl为致孔剂的PDA/PVDF膜对3种染料的截留效果更好,且其对分散深蓝HGL截留率可达87.05%;PDA的加入在一定程度上提高了膜的抗污染性能,2种致孔剂的PDA/PVDF膜均对活性艳橙K-NG有着较高的通量恢复率,以PVP为致孔剂的PDA/PVDF膜在PDA质量分数为1.6%时,对活性艳橙K-NG的通量恢复率达到最大值94.1%。In order to improve the pollution resistance of polyvinylidene fluoride(PVDF)ultrafiltration membrane to organic dyes,PVDF modified ultrafiltration membrane(PDA/PVDF membrane)was prepared by phase transformation method using polydopamine(PDA)as modifier,polyvinylpyrrolidone(PVP)and lithium chloride(LiCl)as pore-forming agents,respectively.We studied the effects of PDA content on the microstructure,fracture strength,dye retention and pollution resistance of PDA/PVDF membrane prepared with two different pore-forming agents,and the permeation separation performance of PDA/PVDF membrane on neutral red,reactive brilliant orange K-NG and dispersed deep blue HGL.The results show that with the increase of PDA content,the pore structure of the membrane is improved,the average pore diameter of the PDA/PVDF membrane with PVP significantly increases,and the hydrophilicity of the membrane is significantly improved,and the contact Angle of the PDA/PVDF membrane with PVP decreases by 24.6%.The addition of PDA can greatly improve the pure water flux and dye retention rate of the PDA/PVDF membrane.The pure water flux of the PDA/PVDF membrane using PVP as the pore-forming agent is much greater than that of the PDA/PVDF membrane using LiCl as the pore-forming agent.The PDA/PVDF membrane using LiCl as the pore-forming agent has the better retention effect on the three dyes.The retention rate of disperse deep blue HGL can reach 87.05%.The addition of PDA can improve the anti-pollution performance of the membranes to some extent.The two kinds of pore-forming agent PDA/PVDF membranes have higher flux recovery rate for active orange K-NG.When the content of PDA is 1.6%,the flux recovery rate for active orange K-NG reaches 94.1%.

关 键 词：聚多巴胺 聚偏氟乙烯膜 相转化法 亲水性 有机染料 

分 类 号：TQ051.8[化学工程]