用BET法测定反渗透与超过滤膜的皮层孔分布

USING BET METHOD TO DETERMIN STRFACE PORE DISTRIBUTION OF RO AND ULTRAFILTRATION

BET法是一种用气体低温吸附测定固体孔径结构的方法。本文详细叙述了BET 法的原理,数据处理和实验方法,测定了两种反渗透膜(二、三混合醋酸纤维素非对称膜,FT-30复合膜)和三种超滤膜(聚矾膜、三醋酸纤维素膜和聚矾酰胺膜)的最可几孔径。结果表明:用ST-03型表面孔径测定仪BET法测定分离膜皮层孔径的范围为γ<300(?)。

BET is a method for determining solid pore structure by low temporature gas adsorption.The foundamental principle and the data treatment,as well as the experiment method have been systematicallydescribed in this paper.The most probability pore radio of two ROmembranes(di—tri mixture cellulose acetate asymmetric membraneand FT—30 composite membrane)and three UF membranes(PS CATand PSA membrane)have been obtained.The results show that therange of separation membrane radio which can be determined by BETmethod using ST—30 Surface Measuring Instrument is<300(?).