摘要
通过溶胶凝胶法和表面涂覆法,先后在PVDF中空纤维膜表面引入亲水SiO_(2)纳米粒子和低表面能PDMS涂层,构建具有高粗糙度、低表面能的超疏水复合膜,并探究SiO_(2)粒径、SiO_(2)溶液涂覆时间、PDMS涂覆时间等条件对复合膜性能的影响。SiO_(2)/PVDF复合膜接触角只有25.8°,而PDMS/SiO_(2)/PVDF复合膜接触角则达到162.3°,膜蒸馏通量约24.5 kg/(m^(2)·h);在60 h质量分数3.5%氯化钠盐溶液膜蒸馏测试中性能稳定,截留率始终保持在99.8%以上.
In this paper,hydrophilic SiO_(2)nanoparticles and low surface energy PDMS coating were successively introduced on the surface of the PVDF hollow fiber membrane through the sol-gel method and the surface coating method to construct a super-hydrophobic composite membrane with high roughness and low surface energy,and explored the effects of SiO_(2) particle size,SiO_(2) solution coating time,PDMS coating time and other conditions on the performance of composite membranes.The contact angle of SiO2/PVDF composite membrane reached 25.8°,the contact angle of PDMS/SiO_(2)/PVDF composite membrane reached 162.3°, and the membrane distillation flux was 24.5 kg/(m^(2)·h).The performance was stable in the 60 h of mass fraction 3.5%sodium chloride solution membrane distillation test,and the rejection rate was kept above 99.8%.
作者
阎安
郭寒雨
史乐
王昌萌
武春瑞
吕晓龙
YAN An;GUO Hanyu;SHI Le;WANG Changmeng;WU Chunrui;LYU Xiaolong(State Key Laboratory of Separation Membranes and Membrane Processes,School of Materials Science and Engineering,Tiangong University,Tianjin 300387,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2021年第4期8-14,共7页
Membrane Science and Technology
基金
国家自然科学基金面上项目(51978466)
国家自然科学基金重点项目(51638011)。
关键词
聚偏氟乙烯
中空纤维膜
超疏水膜
直接接触式膜蒸馏
polyvinylidene fluoride
hollow fiber membrane
superhydrophobic membrane
direct contact membrane distillation
