啤酒酵母吸附重金属离子镉的研究

采用啤酒酵母自制生物吸附剂,进行重金属离子镉的吸附研究.实验结果表明,啤酒酵母对Cd2 的吸附量随pH值的增加而增大.吸附的最佳pH范围是4～7,当pH=6时达到吸附最大值;随着初始Cd2 质量浓度增加,吸附量有所提高;当溶液初始Cd2 质量浓度为50m/L,pH 6时达到实验条件下的最大吸附量为51.5 mgCd2 /g干酵母;啤酒酵母经碱处理后吸附量增大.设计一个L9(33)正交实验,确定pH为反应过程中的显著因素;确定啤酒酵母对Cd2 的吸附过程遵循Langmuir方程.

Study on the Absorption of Heavy-metal Ion Cd by Beer Yeast

Biological absorbent was produced by beer yeast and then used in the absorption of heavy-metal ion Cd.The experimental results suggested that the absorption quantity of Cd2+ increased with the rise of pH value and the best pH value range was between 4 to 7(absorption quantity reached the highest as pH=6).Besides,with the increase of initial concentration of Cd2+,the absorption quantity kept increasing(the maximum absorption quantity(51.5 mg Cd2+ /g dry yeast) achieved as mass concentration of Cd2+ reached 50 m/L with pH value as 6).Beer yeast had the highest absorption capacity if treated by alkani.A L9(33)orthogonal test was set up to prove that pH was the significant factor during the reaction.The absorption process of Cd2+ by beer yeast followed Langmuir equation.