高分子微滤膜流动电位的实验研究

Experimental Study of the Streaming Potential of Porous Polymer MF Membranes

用实验方法研究多孔性高分子聚乙烯管式微滤膜的流动电位．考察不同类型电解质如ＮａＣｌ，ＫＣ１，ＭｇＣｌ２和 ＭｇＳＯ４等溶液对ＭＦ膜的流动电位随浓度的变化关系。结果表明流动电位的 大小与电解质种类和浓度有关，浓度越大．流动电位越小．流动电位实验测定的重现性较好．离 子价态对膜的流动电位影响很大，阳离子比阴离子对膜流动电位的影响更大．二价阳离子对膜的 流动电位影响最大。

The porous polymer MF tubular membrane which is composed of polyethylene has been studied by using the streaming potential method.The dependence of the electrical potential difference on the applied pressure difference between the two sides of the membrane was investigated with the electrolyte solutions such as NaC1, KC1, MgC1 2, Na2 SO4 and MgSO4 under the concentration range of 0.1-20.0 mol/m^3.The experimental results showed that the electrical potential difference is directly proportional to the applied pressure difference and the slope,that is the streaming potential,is related to electrolyte concentration.The higher the electrolyte concentration is,the smaller the streaming potential is,The streaming potential also varied with the kinds of electrolytes. The membrane performance can be returned to the normal state after appropriate washing.