不溶性淀粉黄原酸酯吸附废水中 Cu2+机理研究

摘要

以玉米淀粉为原料合成了不溶性淀粉黄原酸酯(ISX),对不溶性淀粉黄原酸酯进行了红外光谱、扫描电镜和 XRD 表征,重点研究了 ISX 去除 Cu2+机理及吸附动力学、吸附平衡等温式和吸附热力学,结果表明,ISX 吸附 Cu2+为离子交换反应,其吸附速率快,符合拟二级动力学,属于 Freundlich 吸附,吸附过程为吸热、熵增、自发的反应过程。%Insoluble starch xanthate (ISX)was synthesized by using corn starch as raw material,and characterized by FTIR,SEM and XRD.Furthermore,the adsorption mechanism,including adsorption kinetics, equilibrium and thermodynamics of copper ions from aqueous solutions were all investigated.The results indicated the removal mechanism of ISX for Cu(II)was ions exchange,the adsorption kinetics were favorably described by the pseudo - second - order kinetic model and the adsorption isotherms followed well with the Freundlich isotherm model,the thermodynamic study indicated that the adsorption was a spontaneous and endo-thermic process.