Modified Saccharomyces cerevisiae (MSC)was prepared from Saccharomyces cerevisiae (SC)by cystine modification and formaldehyde as crosslinker

and was immobilized by alginate sodium and glut. FTIR was used to characterize MSC and SC

and the effects of pH value and time on uranium adsorption over MSC and SC were investigated. It was found that there were many functional groups on the cell wall of MSC for adsorbing uranium. The optimal conditions for uranium adsorption were as follows: pH of the solution 6.0; the adsorption time for MSC and SC was 1.8 h and 1.5 h

respectively. The adsorption kinetics and isotherm models were proposed for adsorption of uranium on MSC and SC by fitting experimental data. The pseudo-second-order mode was better for both MSC and SC

their correlation coefficient better than 0.99(R2>0.99)

and Langmuir and Freundlich models were better isotherm models

indicating that the adsorption mode of uranium adsorption on MSC and SC was a combination of monolayer cover and multilayer adsorption. The capability of adsorption for MSC was 6.5 times that for SC

and indicated that MSC had potential as bioadsorbent.