啤酒酵母菌对Pb~(2+) 与Zn~(2+) 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.