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Studies on measuring methods for pore size of hollow fiber microfiltration membranes

Authors： ZHANG Yanping, PAN Xianhui, WANG Xuliang, GUAN Yipeng，ZHANG Zhaocai

Units： The Institute of Seawater Desalination and Multipurpose Utilization, SOA (Tianjin), Tianjin 300192, China

KeyWords： microfiltration membrane; pore size; bubble-point method; mercury porosimetry; gas adsorption

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2013,33(3):97-102

Abstract：

Pore size is one of the most important characterization parameter, which directly affects the membrane separation performance. Bubble-point method for analysis of maximum pore diameter of hollow fiber microfiltration membrane was investigated in this study. With polyvinylidene fluoride (PVDF) and polypropylene (PP) microfiltration membrane as the representative examples, the detection conditions were optimized. Optimum bubble-point method was carried out at a temperature of 20 °C for 30 min by using ethanol as the soaking liquid. The relative standard deviations of maximum pore diameter were 5.4% and 8.8% for PVDF and PP microfiltration membrane, respectively. Pore sizes of four hollow fiber microfiltration membranes were determined by bubble-point, mercury porosimetry, and gas adsorption methods, respectively. The results showed that the maximum pore diameters obtained by bubble-point method were strongly correlated with the average pore diameters obtained by mercury porosimetry method. Gas adsorption method was not suitable for the pore size analysis of microfiltration membranes.

Funds：

国家海洋公益性行业科研专项项目（201105025）、中央级公益性科研院所基本科研业务费专项资金项目（K-JBYWF-2011-T04）

AuthorIntro：

张艳萍（1983- ），女，山东淄博人，博士，工程师，从事海水利用膜产品检测技术研究。E-mail: zhangyanping_001@163.com

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