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《Environmental Chemistry》 2007-03
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STUDY ON BIOSORPTION CHARACTER OF CHROMIUM BY THE YEAST FUSED STRAIN

YANG Feng YIN Hua PENG Hui YE Jin-shao HE Bao-yan ZHANG Na QIN Hua-ming(Department of Environmental Engineering,Jinan University,Guangzhou,510632,China)  
Chromium in wastewater was adsorbed by integrated cell,cell wall and inclusion of the yeast fused strain,respectively.The biosorption capability of different components was compared and the adsorption behavior was simulated using dynamic models.The experimental results showed that the removal ratio and the biosorption capacity of chromium by the cell wall were much higher than those by others.Both Freundlich and Langmuir thermodynamical equations were suitable for describing the biosorption of Cr6+ by the integrated cell and the cell wall.Furthermore,the maximum biosorption capacity and the affinity of the cell wall for Cr6+ all exceeded those of the integrated cell,which demonstrated that the cell wall was the main site for adsorbing metal ions.Several advanced analysis techniques were used to study the biosorption mechanism.The special structure of yeast cell wall and atomic force microscope experiment indicated that the cell wall could provide wider space for active radicles adsorbing and chelating metal ions.X-ray spectroscopy and Fourier transform infrared spectroscopy observations showed that structure of the biosorbent was not destroyed after biosorption.
【Fund】: 国家自然科学基金资助项目(50278040);; 广东省科技厅科技计划重大专项(2004A3030800).
【CateGory Index】: X172
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