亲水改性聚偏氟乙烯静电纺丝膜及其自重驱动油/水分离性能  

Hydrophilic modification of electrospun polyvinylidene fluoride membranes and the oil/water separation performance driven by self-weight

作　　者：吕艺舒 孟娇 张旋[1] 陈艳[1] 郎万中[1] LYU Yishu;MENG Jiao;ZHANG Xuan;CHEN Yan;LANG Wanzhong(The Education Ministry Key Lab of Resource Chemistry,College of Chemistry and Materials Science,Shanghai Normal University,Shanghai 200234,China)

机构地区：[1]上海师范大学教育部资源化学重点实验室,化学与材料科学学院,上海200234

出　　处：《膜科学与技术》2022年第4期105-111,共7页Membrane Science and Technology

基　　金：上海市地方能力建设项目(14520502900);上海绿色能源化工工程技术研究中心项目(18DZ2254200);国家自然科学基金项目(22005191)。

摘　　要：为了提升聚偏氟乙烯(PVDF)膜的油/水分离性能,在静电纺丝PVDF基膜表面先后沉积聚多巴胺(PDA)和水凝胶海藻酸钙(CaAlg)并制备了CaAlg-PDA/PVDF复合膜.利用PDA强黏附性和CaAlg与PDA亲和性,增强水凝胶改性PVDF膜的渗透稳定性.结果表明,在2 mg/mL多巴胺溶液中自聚反应后PVDF膜的孔径变化不大,进一步经水凝胶改性后所制CaAlg-PDA/PVDF复合膜的水浸润性明显提升,且平均孔径、孔隙率都大幅下降.所制备的CaAlg-PDA/PVDF复合膜对石油醚乳化油的截留率最高可达99.9%,渗透系数在2.0×10~4 L/(m~2·h·MPa)以上;而对正己烷乳化油的截留率最高也可达99.9%,渗透系数则高于3.2×10~4 L/(m~2·h·MPa).相较于CaAlg/PVDF膜,CaAlg-PDA/PVDF复合膜具有更好的性能稳定性.In order to improve the oil-water separation performance of polyvinylidene fluoride(PVDF)membrane,the CaAlg-PDA/PVDF composite membranes were prepared by depositing polydopamine(PDA)and hydrogel calcium alginate(CaAlg)on the surface of electrospun PVDF base membrane successively.The strong adhesion of PDA and the affinity between CaAlg and PDA were used to enhance the performance stability of CaAlg-PDA/PVDF membranes.The results show that the pore size of PVDF membrane cannot change much after self-polymerization in 2 mg/mL dopamine solution.The water wettability of CaAlg-PDA/PVDF composite membrane is significantly improved after further hydrogel modification,and the average pore size and porosity of PVDF composite membrane are significantly decreased.The CaAlg-PDA/PVDF composite membranes have the highest rejection of 99.9%for petroleum ether emulsion oil,and the water permeance is higher than 2.0×10~4 L/(m~2·h·MPa).For emulsified n-hexane solution,the highest rejection also can achieve 99.9%,and the water permeance is higher than 3.2×10~4 L/(m~2·h·MPa).Compared with the CaAlg/PVDF membranes,the CaAlg-PDA/PVDF composite membranes show better performance stability.

关 键 词：聚偏氟乙烯膜 静电纺丝膜 微滤膜 油/水分离 

分 类 号：TQ031[化学工程] TQ028