本文通过错流过滤方式下的流动电势测量对氧化铝微滤膜的电动性能进行表征,研究了过滤介质溶液pH、电解质种类和浓度等对膜的电动性能的影响.结果表明,膜流动电势大小取决于过滤溶液pH、电解质溶液种类和浓度.采用浓度为10-3M 的NaCl溶液为过滤介质时,膜的等电点为6.1,而采用相同浓度的CaCl2 和Na2SO4溶液时,由于对Ca2+和SO42-的特定吸附,膜等电点分别增大至6.8和减小至5.6.由于Ca2+和SO42-在膜孔表面存在特定吸附,溶液离子浓度提高导致膜的等电点和表面净电荷符号改变,而NaCl溶液浓度提高仅使膜流动电势逐渐减小,但等电点不变.
The electrokinetic properties of Al2O3 microfiltration membranes (MF) were characterized by streaming potential measurements during tangential filtration of solutions with various conditions of pH, electrolyte species and concentration. Results show that the streaming potentials are dependent on the pH of filtered solutions, types of the electrolyte and ionic concentration. The IEP of the membrane is about 6.1 when filtered with 10-3 mol/L NaCl solution, and shifts toward a higher pH of 6.8 and a lower pH of 5.6 for the solutions of CaCl2 and Na2SO4 with the same ionic concentration, respectively, because of specific adsorption of Ca2+ and SO42-. The specifically adsorbed ions (Ca2+ and SO42-) can change the IEP and net charge sign of the membranes as their concentration increases, whereas electrolytes NaCl can only asymptotically reduce it to zero.
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