基于Zeta电位法研究腐殖酸对超滤膜的污染  

Exploration of Ultrafiltration Membrane Fouling by Humic Acid Based on Zeta Potential Method

作　　者：王旭亮 赵静红 李宗雨 潘献辉 郝军 WANG Xu-liang;ZHAO Jing-hong;LI Zong-yu;PAN Xian-hui;HAO Jun(The Institute of Seawater Desalination and Multipurpose Utilization,SOA 〈 Tianjin 〉,Tianjin 300192,China)

机构地区：[1]国家海洋局天津海水淡化与综合利用研究所,天津300192

出　　处：《中国给水排水》2018年第17期48-51,共4页China Water & Wastewater

基　　金：国家科技支撑计划项目(2014BAB06B00);中央级公益性科研院所基本科研业务费专项资金资助项目(K-JBYWF-2015-T15)

摘　　要：基于Zeta电位法表征膜表面的荷电性能,分析单一腐殖酸或与Ca^(2+)共存下的吸附行为对超滤膜表面Zeta电位的影响及膜通量的变化,深入了解膜与腐殖酸的作用机制,阐释超滤膜污染的作用机理,为表征超滤膜的耐污染性能提供一种新颖的有效手段。结果表明,在中性溶液中,PVDF超滤膜表面ζ<0,电性为负;腐殖酸的吸附导致膜通量大幅衰减,同时Zeta电位变化明显,随着腐殖酸浓度的增加,Zeta负电位变大; Ca^(2+)加速了对腐殖酸的吸附,同时中和膜表面所吸附的负电荷,削弱膜与腐殖酸分子之间的静电排斥作用,导致吸附增加,膜通量下降,加重膜污染。Based on charge property of membrane surface characterized by Zeta potential method, the effects of adsorption behavior of single humic acid or coexisting with Ca2＋ on Zeta potential of uhrafil- tration membrane surface and the change of membrane flux were analyzed, which desired to further understand the interaction between humic acid and membrane, explain the mechanism of uhra：filtration membrane fouling, and provide a new and effective way to characterize the fouling resistance of uhrafiltra- tion membrane. The results showed that under the condition of neutral solution, the surface （ of PVDF ultrafiltration membrane was less than zero, which indicated that the conductivity was negative. The adsorp tion of humic acid resulted in a significant decrease of membrane flux, while the Zeta potential changed significantly. With the increase of humic acid concentration, Zeta negative potential increased. The addi- tion of Ca2 ＋ accelerated the adsorption of humic acid, and it neutralized the negative charge absorbed by the membrane surface and impaired the electrostatic repulsion between membrane and humic acid mole- cules. As a result, the adsorption increased, membrane flux decreased, and membrane fouling was accel- erated.

关 键 词：ZETA电位 超滤膜 腐殖酸 吸附污染 膜性能表征 

分 类 号：TU991[建筑科学—市政工程]