螯合改性蔗渣纤维素对Cr^(3+)、Zn^(2+)、Cd^(2+)的吸附平衡与动力学研究

Kinetic and Equilibrium Adsorption of Cr^(3+),Zn^(2+),Cd^(2+) Ions with Bagasse Cellulose Xanthine

用丙烯酸乙酯、乙二胺对双醛蔗渣纤维素进行接枝反应,然后用CS_2黄化,制备了具有氨基和酰胺基的蔗渣纤维素,研究了其对重金属离子Cr^(3+)、Zn^(2+)、Cd^(2+)的吸附行为。实验结果表明,改性蔗渣纤维素对Cr^(3+)、Zn^(2+)、Cd^(2+)的平衡吸附量分别为34.873mg·g^(-1)、25.451mg·g^(-1)和36.345mg·g^(-1)。等温吸附过程符合Langmuir方程,吸附过程可能属于单分子层吸附。动力学吸附过程符合准二级动力学模型,吸附过程可能属于化学吸附反应。

The containing acylamino and amino chelating bagasse cellulose xanthate synthesized by the grafting reaction of bagasse,methyl acrylate,epichlorohydrin and carbon disulfide,was used to investigate the adsorptions of Cr3+,Zn2+and Cd2+ions.The results showed that the order of the equilibrium adsorption capacity for three metal ions was as followed:Cd2+>Cr2+>Zn2+,the value was calculated to be 34.873mg/g,25.451mg/g and 36.345mg/g,respectively.The Langmuir isotherm model could explain the isotherm data,and indicated the process was possi-ble monolayer adsorption.The pseudo second-order rate equation could explain the kinetic experimental data,this suggested the adsorption process was possible chemical adsorption reaction.