Biosorption of Lead Ions on Dried Waste Beer Yeast and the Analysis by FTIR
DAI Qun-wei1, 2, DONG Fa-qin1*, ZHANG Wei1
1. Key Laboratory of Solid Waste Treatment and the Resource Recycle (SWUST, Ministry of Education), Mianyang 621010, China 2. Institute of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
Abstract：The biosorption of lead ions on dried waste beer yeast was investigated with respect to the adsorption conditions and the biosorption mechanism was analyzed with the instruments of AAS, SEM/EDS and FTIR. The results show that the metal uptake value obtained was 47.6 mg·g-1 and the adsorptive efficiency was above 90%. Under our experiment conditions, the biosorption of Pb2+ on dried waste beer yeast is a fast process. The biosroption quantity of Pb2+ on beer yeast cells was 47.6 mg·g-1 and the adsorption efficiency obtained was 91.6％in fisrt 30 min, then the metal uptake value obtained was 48.8 mg·g-1 and the adsorptive efficiency was above 94% at 90 min. The cells cracking and breaking off were seen after the biosorption of lead ions on beer yeast through SEM analysis, and the cytoplasts from yeast cell should be responsible for the last period biosorption of lead ions. EDS analysis also proved that lead ions were absorbed on the yeast cells. FTIR analysis showed that the infrared spectrograms are different at different pH and biosorption time, especially hydroxyl groups, carboxylate groups and amide groups have obviously changed. Amylase and amide of protein were considered as main components to participate the chemical absorption of lead ions on yeast cells. Consequently, dried waste beer yeast is an inexpensive, readily available adsorbent for metals and especially has a high adsorption capacity for lead ions.
代群威1, 2,董发勤1*,张伟1. 干废弃啤酒酵母菌对铅离子的吸附及FTIR分析[J]. 光谱学与光谱分析, 2009, 29(07): 1788-1792.
DAI Qun-wei1, 2, DONG Fa-qin1*, ZHANG Wei1. Biosorption of Lead Ions on Dried Waste Beer Yeast and the Analysis by FTIR. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(07): 1788-1792.
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