%0 Journal Article
%T Characteristic parameters and operational curves of ¦Ã-Al2O3 nanofiltration membranes
%A Rongchun Xiong
%A Xiaodong Lei
%A Gang Wei
%J Chinese Science Bulletin
%@ 1861-9541
%D 2003
%I 
%R 10.1007/BF03184209
%X The ¦Ã-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 ¦Ã-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).
%K ¦Ã-Al2O3 membrane
%K nanofiltration
%K Ca2+ retention
%K Debye length
%K isoelectric point
%U http://link.springer.com/article/10.1007/BF03184209