超滤膜表面Zeta电位测试方法研究

摘要

Choose three different ultrafiltration membrane,to investigate the effect of the fac-tors such as type and concentration of electrolyte,pH on Zeta potential of ultrafiltration membrane, and it offer basis for exact measurement of membrane Zeta potential. The results show that under the same electrolyte concentration , the higher valence the cation, the smaller the absolute value of streaming potential ;the streaming potential decreases with the increase of the solute concentration under the same pressure, The pH value of electrolyte solution has great effect on the Zeta potential of the membrane surface,when the pH of the electrolyte solution is greater than that of the isoelectric point,the absolute value of Zeta potential and flux increase with pH value.%选取三种不同材质的超滤膜,考察不同电解质溶液种类、浓度以及pH值等因素对膜表面Zeta电位的影响,为膜表面Zeta电位的准确测试提供了依据。结果表明,同一浓度下,阳离子价态越高,流动电位绝对值越小；膜面Zeta电位绝对值随着电解质浓度的增大而减小；溶液pH值对Zeta电位影响较大,当溶液pH值超过等电位点时,Zeta电位绝对值随溶液pH值的增加而增加。