啤酒酵母菌对Pb2+与Zn2+的生物吸附规律

研究了啤酒酵母菌体对工业废水中重金属离子Pb2 ,Zn2 的生物吸附规律.实验结果表明,啤酒酵母菌体对Pb2 的吸附效果比对Zn2 的吸附效果要好;啤酒酵母菌体对铅离子和锌离子的吸附作用与pH值密切相关,最佳的pH值范围均是4～6.体系pH=4时,啤酒酵母菌对Pb2 的吸附量最大,为98.20mg/g;在pH=5.5时,啤酒酵母菌对Zn2 的吸附量最大,为13.89mg/g.在初始铅、锌离子浓度均为1mmol/L的水溶液中,吸附时间为15min即达到吸附平衡,该吸附过程具有一级动力学反应特征.

Study on Biosorption of Pb2+ and Zn2+ by Saccharomyces Cerevisiae

The biosorption of Pb~(2 ) and Zn~(2 ) in industrial effluent by Saccharomyces cerevisiae (S.c.) was investigated experimentally. The results showed that the biosorbent has a higher adsorbility to Pb~(2 ) than to Zn~(2 ) and its adsorbility to Pb~(2 ) and Zn~(2 ) is closely in connection with its pH value of which the best rang is from 4.0 to 6.0. When the pH value is 4.0, its adsorption quantity of Pb~(2 ) is up to 98.20mg/g and when pH=5.5 that of Zn~(2 ) up to 13.89mg/g. In the aqueous solution of which the initial Pb~(2 ) or Zn~(2 ) concentration is 1mmol/L, an adsorption equilibriums comes into being for only 15min, and the adsorbing process is characterized with 1st-grade kinetic reaction.