摘要
膜蒸馏是一种低能耗、高效率的海水淡化技术.文章借鉴了制备压力推动膜材料的思路,采用非对称、孔结构高度连通的亲水聚醚砜膜,通过CF4等离子体表面改性,将亲水膜改性为疏水膜材料,并应用于直接接触式膜蒸馏(DCMD)过程.对膜的结构,接触角和DCMD性能进行了表征.结果显示,改性后PES膜表面水接触角达120°.以4%NaCl水溶液为原料,膜蒸馏中水通量达44 kg/(m2.h)(盐水温度72.6℃,冷水侧温度15℃),对盐的截留率达99.96%.实验表明,孔连通性较好的小孔径聚醚砜膜具有较好的膜蒸馏性能,可能成为具有商业用途的膜材料.
A new type of PES membrane for membrane distillation based an asymmetric hydrophilic PES membrane was prepared by surface modification via CF4 plasma treatment. The membrane morphology, hydrophobicity and performance in DCMD were characterized. The water contact angle of CF4 treated membrane was about 120°. A water flux of 44 kg/（m2 ·h） （feed salt solution temperature at 72. 6 ℃, cold side temperature at 15 ℃） and salt rejection of 99.96% were obtained. The present work indicates that porous membranes with small pore size are promising for commercial applications.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2011年第6期50-55,共6页
Membrane Science and Technology
基金
国家重大基础研究"973"项目(2009CB623402)
国家自然科学基金资助项目(20976083)
科技部中-以合作研究项目(201001)
关键词
膜蒸馏
表面处理
疏水
聚醚砜
四氟化碳
membrane distillation
surface treatment
hydrophobic
polyethersulfone
CF4
