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研究D860阳离子交换树脂对V(Ⅳ)的吸附性能,进行pH、平衡吸附时间、温度和V(Ⅳ)初始浓度试验,分析了吸附过程的热力学、动力学特征以及等温吸附模型,同时研究了共存杂质离子对D860树脂吸附V(Ⅳ)的影响。结果表明,D860树脂吸附V(Ⅳ)的最佳pH为2.5,吸附平衡时间为8h,吸附量随温度、V(Ⅳ)初始浓度的升高而增大;吸附过程的ΔH=3.78kJ/mol、ΔS=49.44J/(mol·K)、ΔG298K=-10.95kJ/mol;拟一级、拟二级动力学模型均可以较好地解释吸附过程,吸附过程速率主要受颗粒扩散控制,表观吸附活化能为23.76kJ/mol;吸附符合Langmuir等温吸附模型;V/Al、V/P、V/Fe的分离因数均大于1。
The adsorption of V (Ⅳ) on D860 cation exchange resin was studied. The pH, equilibrium adsorption time, initial temperature and initial concentration of V (Ⅳ) were studied. The thermodynamic and kinetic characteristics and isothermal adsorption model of the adsorption process were analyzed. Impacts of Impurity Ions on V (Ⅳ) Adsorption of D860 Resins. The results showed that the optimum pH of V (Ⅳ) adsorbed on D860 resin was 2.5, and the adsorption equilibrium time was 8h. The amount of adsorption increased with the increase of initial concentration of V (Ⅳ); ΔH = 3.78kJ / mol , ΔS = 49.44J / (mol · K), ΔG298K = -10.95kJ / mol. Both pseudo-first-order and second-order kinetic models can well explain the adsorption process. The adsorption rate is mainly controlled by particle diffusion. The apparent The adsorption activation energy was 23.76 kJ / mol. The adsorption was in accordance with the Langmuir isothermal adsorption model. The separation factors of V / Al, V / P and V / Fe were all greater than 1.