离子交换树脂吸附稀硫酸中铁离子的热力学和动力学

采用静态实验法研究了D001树脂吸附铁离子的反应机理,在实验条件下分别用朗格缪尔(Langmiur)和弗伦德利希(Freundlich)等温吸附模型分析了D001树脂对铁离子的吸附热力学过程.结果显示:Langmuir方程有更高的相关性,能够更好地拟合树脂吸附铁离子的过程.热力学函数ΔG<0表明D001树脂吸附铁离子过程能够自发进行;ΔH>0表明离子交换过程为吸热过程,ΔS>0表明吸附过程的熵变是增大的.准二级动力学模型能够很好拟合D001树脂吸附铁离子的过程并且其相关系数在0.99以上,树脂对铁离子的吸附过程主要速率控制过程为颗粒扩散.

Thermodynamics and kinetics of ion exchange resin adsorption iron ions of dilute sulfuric acid

The reaction mechanism on adsorption of D001 resin to iron ion was studied with static experimental method.Langmiur and Freundlich adsorption isotherm equation was studied in the experimental condition to analyze the adsorption thermodynamic processes of the D001 resin to iron ion.The results show that langmuir equation has a higher correlation to better fit the resin adsorption process of iron ion.Thermodynamic function ΔG<0 shows that process of D001 resin adsorption iron ion can occur spontaneously,ΔH>0 shows that the ion exchange process is an endothermic process,and ΔS>0 indicats that the entropy change of the adsorption process is increasing.Quasi-second order kinetic model can be well fitting D001 resin adsorption process of the iron ion,and the correlation coefficient is greater than 0.99.The main rate control process of resin adsorption process of the iron ion is particle diffusion.