毛木耳子实体对Ni(Ⅱ)生物吸附的优化研究

Optimization of Ni(Ⅱ) biosorption by fruiting bodies of Auricularia polytricha with response surface methodology

采用响应曲面法研究了起始pH值、固液比、重金属初始浓度等因素对毛木耳子实体吸附Ni(Ⅱ)的影响.采用中心组合法及批量实验,对吸附过程进行优化,确定了最优条件.结果表明,起始pH值、固液比、Ni(II)初始浓度对吸附过程均有显著影响(P<0.0001),毛木耳子实体吸附Ni(Ⅱ)最佳条件为pH5.41,固液比6.00g/L,起始浓度24.0mg/L,在此条件下Ni(Ⅱ)的吸附率实测值达到87%.二阶多项式模型很好地拟合了毛木耳子实体吸附Ni(Ⅱ)的过程,模型与实测资料拟合的R2值为0.9771.

The effect of initial solution pH values,biomass doses,and initial ion concentrations on the removal efficiency of Ni（Ⅱ） by fruiting body of Auricularia polytricha was studied using the Response Surface Methodology（RSM）.The biosorption of Ni（Ⅱ） by fruiting body of A.polytricha was carried out with batch experiments and the optimal experimental condition was determined using the central composite design（CCD）.Results showed that the Ni（Ⅱ） biosorption processes were affected significantly by pH values,biomass doses,and initial ion concentrations（P〈0.0001）.The optimum parameters of the biosorption of Ni（Ⅱ） were found to be 5.41,6.00g/L and 24.0mg/L for initial pH,biomass dose,and initial ion concentration,respectively.At the optimal conditions,the biosorption efficiencies of Ni（Ⅱ） by A.polytricha were 87%.The value of R^2（0.9771） indicates a high correlation between the observed and the predicted values.