流动电位法测定中空纤维膜表面的ζ电位  

MEASUREMENTS OF ZETA POTENTIAL ON THE SURFACE OF HOLLOW-FIBLE MEMBRANE BY USING STREAMING POTENTIAL METHOD

作　　者：陈莉[1] 杨庆[1] 常青[1] 马东华[1] 

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《水处理技术》2008年第3期24-27,共4页Technology of Water Treatment

基　　金：国家自然科学基金资助项目(50578072);甘肃省科技攻关计划项目(2GS054-A44-016)

摘　　要：根据流动电位与表面ζ电位的关系,研制了一套中空纤维膜表面ζ电位的测定装置,对NaCl、KCl、CaCl2三种电解质溶液中聚丙烯膜的流动电位进行了研究。结果表明,在中性条件下,膜表面带负电;膜丝间毛细孔径和试验操作方法对ζ电位有影响,毛细孔径越大,ζ电位的绝对值越小,降压法得到的ζ电位值大于快速升压法。ζ电位的大小与电解质溶液的浓度和种类有关,阳离子价态对ζ电位影响很大。According to the relationship between streaming potential and zeta potential, an apparatus for measuring zeta potential of hollow-fible microfiltration membrane was developed. The surface streaming potential measurements ofpolypropylene membrane were carried out in three electrolyte solutions （NaCl,KCl,CaCl2）.The results show that： the charge of PP membrane is negative in neutral condition; The pore size of membranes and the method of measurement can affect membrane zeta potentials obviously. The higher the pore size is, the smaller the absolute value of zeta potential is. The absolute value of zeta potential with pressure downward mode is higher than that of pressure upward mode. The zeta potentials are also related to the electrolyte concentrations and species. The higher the electrolyte concentration is, the higher the zeta potential is. The zeta potential of membrane depends strongly on the valence of cations.

关 键 词：中空纤维膜 流动电位 Ζ电位 

分 类 号：TQ028.8[化学工程]