抄録
Studies of Zr (IV) and Fe (III) dynamic ultrafiltration membranes were carried out on porous ceramic supports. Molecular weight cut-off values of these membranes could be controlled by pH conditions during membrane formation and depended on a kind of membrane materials, such as Zr (IV) and Fe (III) colloids. The pH condition which was changing from pH 2.2 to pH 3 or pH 4 during membrane formation, gave a more tight moleculal weight cut-off rather than the constant pH condition. The molecular weight cut-off of the Zr (IV) dynamic membrane, formed by pH changing condition, was smaller than that of the Fe (III) dynamic membrane.
It is supposed that the Zr (IV) colloid particles, entered into the ceramic support, were very fine in the low pH condition and grew into larger particles with changing up of pH condition during membrane formation and made the pass way of solutes thinner.
