膜蒸馏脱盐用超疏水复合膜的研制
作者:阎安,郭寒雨,史乐,王昌萌,武春瑞,吕晓龙
单位: 省部共建膜分离膜与膜过程国家重点实验室,天津工业大学 材料科学与工程学院,天津 300387
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
分类号: TQ028.8
出版年,卷(期):页码: 2021,41(4):8-14

摘要:
 本文通过溶胶凝胶法和表面涂覆方法,先后在PVDF中空纤维膜表面引入亲水SiO2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SiO2粒径、SiO2溶液涂覆时间、PDMS涂覆时间等条件对复合膜性能的影响。SiO2/PVDF复合膜接触角达到25.8°,PDMS/SiO2/PVDF复合膜接触角达到162.3°,膜蒸馏通量约24.5 kg/(m2•h);在60 h 3.5wt%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 SiO2 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 SiO2 particle size, SiO2 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/SiO2/PVDF composite membrane reached 162.3°, and the membrane distillation flux was 24.5 kg/(m2•h). The performance was stable in the 60 h of 3.5wt% sodium chloride solution membrane distillation test, and the rejection rate was kept above 99.8%.

基金项目:
国家基金项目(51978466),国家基金重点项目(51638011)

作者简介:
阎安(1995-),男,天津宁河人,硕士研究生,从事膜材料表面改性及应用研究,Email:13072092170@163.com

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