聚丙烯腈UF膜的微孔表面ζ电位和电荷密度  

ζPotentials and Pore Surface Charge Densities on the Porous Surface of Polyacrylonitrile Membranes(ACP-0053UF Membrane)

作　　者：王建[1] 王晓琳[2] 

机构地区：[1]连云港化工高等专科学校,江苏连云港222001 [2]清华大学,北京100084

出　　处：《过滤与分离》2002年第1期7-9,26,共4页Journal of Filtration & Separation

基　　金：国家自然科学基金资助项目(29876118)

摘　　要：根据Helmholtz-Smoluchowski方程,由实验测定的流动电位计算聚丙烯腈ACP-0053超滤膜的ζzeta电位,并根据Gouy-Chapmann方程,估算出膜的微孔表面电荷密度。表明UF膜微孔表面ζ电位和电荷密度与电解质的种类、浓度有关。UF膜在NaCl与KCl体系的ζ电位相近,在MgCl2与MgSO4体系的ζ电位也相近,即阳离子价态和结构越相近,ζ电位越相近,但当阴离子价态较高时,也有一定影响。由膜微孔表面ζ电位和电荷密度随溶液浓度的变化关系可知,在低浓度区域,膜表面ζ电位和电荷密度较高,并出现一个峰值,之后随浓度增大而缓慢降低。According to Helmholtz-Smoluchowski equation,ζpotentials of the Porous Polyacrylonitrile Membranes(ACP_0053UF Membrane)were calculated from the experimental data of streaming potentials.Then their pore surface charge densities were evaluated from the aboveζpotentials based on Gouy-Chapmann equation.The calculation results showed thatζpotentials and surface charge densities of the UF membranes are related to the kinds and concentrations of electrolytes.

关 键 词：聚丙烯腈 超滤膜 流动电位 ξ电位 表面电荷密度 膜分离 

分 类 号：TQ028.8[化学工程] TQ051.893