改良固定化香菇废弃物对Cu^(2+)的热力学吸附研究

Thermodynamics research on copper adsorption by the improved immobilized Lentinus edodes residue

利用磷酸钠对固定化香菇进行二次交联反应,缩短了固定化香菇对Cu^(2+)吸附平衡时间,探讨其吸附等温线、吸附动力学及吸附热力学。结果表明,改良固定化香菇对Cu^(2+)的吸附平衡时间为120 min,伪二级动力学模型比伪一级动力学模型更适合描述改良固定化香菇吸附Cu^(2+)的动力学过程,相关系数R^2为0.998 1;Langmuir模型和Freundlich模型均能很好地描述改良固定化香菇吸附Cu^(2+)的热力学过程,热力学参数ΔH~θ=8.91 kJ/mol,ΔS~θ=26.15 J/(mol·K),ΔG~θ=-1.93 kJ/mol(40℃),这表明改良固定化香菇吸附Cu^(2+)是一个自发吸热的过程,温度的升高更有利于吸附的进行。

Using sodium phosphate for a second times cross-linking reaction and the adsorption equilibrium of Cu^2+ was shortened.The adsorption isotherm,adsorption kinetic and the adsorption thermodynamics were carried out.Results showed that the equilibrium time for Cu^2+ adsorption by the improved immobilized Lentinus edodes residue was 120 min.Pseudo-second-order model fit the Cu^2+ adsorption kinetics well,with correlation coefficient R^2 0.998 1;Both models of Langmuir and Freundlich can fit the Cu^2+ thermodynamics progress well,while the parameters of thermodynamics were Δ H^θ=8.91 kJ/mol,Δ S^θ=26.15 J/(mol·K),ΔG^θ=-1.93 kJ/mol(40 ℃).It demonstrated that the Cu^2+ by immobilized Lentinus edodes residue adsorption was a spontaneously endothermic process,and the increase of temperature was benefit for Cu^2+ adsorption.