| Abstract: In this paper, the curves of surface ζ potential versus pH for Zhejiang, Jilin and other several local diatomites were studied, and their isoelectrical point(IEP) values were determined. Among them, the acid strength of Jilin diatomite surface attained maximum value and IEP minimum, their acid strengths were concerned with the structure of diatom frustules. Under the experiment conditions, IEP value of Zhejiang and Jilin diatomite increased with roasting temperature, so that the capacity of adsorption of urokinase increased gradually according to the surface acid strength. When diatomite roasted at 400℃ their acid strength attained maximum value and IEP minimum, only did specific surface of Jilin diatomite attained maximum value, so their capacity of adsorption of urokinase attained maximum value, after diatomite was washed with acid, its IEP value increased, and acid strength decreased, the capacity of adsorption of urokinase also decreased accordingly. |
