摘要
以全氟正已烷为等离子体源对聚醚砜微孔膜进行表面疏水改性,X光电子能谱(XPS)分析结果证实了全氟正己烷在膜表面的存在,膜表面氟含量最高达到49%。改性后的膜疏水性显著提高,水接触角从92°提高到123°。扫描电镜结果显示改性膜的表面被一薄层覆盖,但膜的本体结构无明显变化。将改性后的膜用于真空膜蒸馏淡化模拟海水的试验中,结果表明在雷诺数较小的情况下,改性膜的脱盐率达99.99%,通量迭4530ml/(m^2·h)。
The hydrophobic surface modification of polyethersulfone microporous membranes was achieved via low temperature perfluohexane plasma treatment. X-ray photoelectronic spectroscopy (XPS) results confirmed the existence of perfluohexane segments on the membrane surfaces and the content of fluorin reached 49%. Water contact angle of the membranes increased from 92 to 123°, suggesting the hydrophobicity of the membranes was improved significantly. Furthermore, scanning electronic microscopy (SEM) images showed that the surface of the modified membrane was covered by a lamella which contained fluorin, but the main structure was not changed. The modified membranes were applied in vacuum membrane distillation (VMD) for desalination. The experimental results showed that, under a low Re constant, the desalination rate was 99.99% and the distillation flux reached 4530ml/(m^2· h).
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第4期573-575,579,共4页
Journal of Functional Materials
基金
国家重大基础研究发展计划(973计划)资助项目(2003CB615705)
关键词
聚醚砜
微孔膜
疏水改性
膜蒸馏
polyethersulfone
microporous membrane
hydrophobic modification
membrane distillation