螯合木屑黄原酸盐对Cu^(2+)、Ni^(2+)和Cd^(2+)的吸附平衡与动力学研究

Kinetic and Equilibrium Adsorption of Cu^(2+),Ni^(2+) and Cd^(2+) Ions on Chelating Sawdust Xanthate

采用丙烯酸甲酯、乙二胺对碱化木屑进行接枝反应,然后用二硫化碳黄化,合成了具有酰胺基和氨基的木屑黄原酸盐;并研究了其对重金属离子Cu2+、Ni2+和Cd2+的吸附行为。结果表明,螯合木屑黄原酸盐对Cu2+、Ni2+和Cd2+的平衡吸附量次序为:Cd2+>Cu2+>Ni2+,其值分别是32.873 mg/g、17.328 mg/g和32.982 mg/g。等温吸附过程符合Langmuir方程,说明吸附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 sawdust xanthate synthesized by the grafting reaction of sawdust,methyl acrylate,epichlorohydrin and carbon disulfide was used to investigate the adsorptions of Cu2＋,Ni2＋ and Cd2＋ ions.The results showed that the order of the equilibrium adsorption capacity for three metal ions was as follows： Cd2＋ Cu2＋ Ni2＋,the value was calculated to be 32.873 mg/g,17.328 mg/g and 32.982 mg/g respectively.The Langmuir isotherm model could explain the isotherm data,and indicated the process was possible monolayer adsorption.The pseudo second-order rate equation could explain the kinetic experimental data,this suggested the adsorption process is possible chemical adsorption reaction.