Characteristic parameters and operational curves of g-Al_2O_3 nanofiltration membranes

作     者：XIONG Rongchun, LEI Xiaodong & WEI Gang Beijing University of Chemical Technology, Beijing 100029, China 

出 版 物：《Chinese Science Bulletin》 (科学通报(英文版))

年 卷 期：2003年第48卷第10期

页      面：971-974页

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：特征参数 操作曲线 γ-Al2O3 纳米过滤膜 拜耳长度 Ca^2+ 三氧化二铝 钙离子 吸附 

摘      要：The g-Al2O3 nanofiltration membranes were manufactured by the sol-gel technique. The result of N2 adsorption and desorption test indicates that the characteristic parameters of the membranes: BJH desorption average pore diameter, BJH desorption cumulative volume of pores and BET surface area are about 3.9 nm, 0.33 cm3/g and 245 m2/g respectively, and the pore size distribution is very narrow. The operational curves of g-Al2O3 nanofiltration membranes of the Ca2+ retention rate vs the trans-membrane pressure, feed concentration of solution treated and pH of solution treated were studied for the first time. It is found that the retention rate for Ca2+ increases with the transmembrane pressure increasing and decreases with the feed concentration of CaCl2 solution increasing. The retention of Ca2+ is very much dependent on the pH of the solution. Minimal Ca2+ retention rate is found at the isoelectric point (pH = 7.5).