花生壳活性炭对Cr(Ⅵ)的吸附性能

Adsorption Performance of Activated Carbon Made from Peanut Shells for Cr(Ⅵ)

研究了花生壳活性炭对水溶液中Cr(Ⅵ)的吸附性能。结果表明,花生壳活性炭对Cr(Ⅵ)具有良好的吸附作用。常温下,0.1g花生壳活性炭,对20mL pH为1.5,ρ[Cr(Ⅵ)]为20.0 mg/L溶液,振荡吸附120min,Cr(Ⅵ)的去除率可达98.68%。花生壳活性炭对Cr(Ⅵ)的吸附符合Freun-dlish吸附等温方程和一级动力学方程。吸附过程的自由能变△G<0,焓变△H>42 kJ/mol,熵变△S>0,说明花生壳活性炭对Cr(Ⅵ)的吸附为自发的吸热化学过程。

Adsorption performance of activated carbon made from peanut shells for Cr（Ⅵ） in aqueous solution was studied.Results showed that the activated carbon had a good adsorption function to Cr（Ⅵ）.At room temperature,the removal efficiency of 0.1 g activated carbon could up to 98.68% under 120 min vibration time for 20 mL solution in which the Cr（Ⅵ） concentration was 20.0 mg/L and pH was 1.5.The adsorption behavior of the activated carbon for Cr（Ⅵ） was in accord with the Freundlish adsorption isotherms equation and first-order kinetics model.In the adsorption process：Gibbs free energy changes △G0,enthalpy changes △H42 kJ/mol and entropy changes △S0,which indicated that this adsorption process was a spontaneous endothermic chemical process.