D314树脂吸附钼离子的热力学和动力学

摘要

采用静态实验法研究D314树脂吸附钼离子的机理,在实验条件下分别用弗伦德利希(Freundlich)和朗格缪尔(Langmuir)等温吸附模型分析了D314树脂对钼离子的吸附热力学过程.结果表明,Langmuir方程相关性较高,可拟合钼离子的吸附过程.ΔH>0表明离子交换过程为吸热过程,热力学函数 ΔG<0表明D314树脂吸附钼离子过程能够自发进行,ΔS>0表明钼离子吸附是熵增过程.准二级动力学模型其相关系数R2在0.99以上能够很好拟合D314树脂吸附钼离子的过程,颗粒扩散为钼离子吸附过程的主要控速步骤.%The mechanism of adsorption of molybdenum ions by D314 resin was studied by static experi-ment. The adsorption thermodynamics of D314 resin on molybdenum ion was analyzed by Freundlich and Langmuir isothermal adsorption model respectively under experimental conditions. The results show that the Langmuir equation has a high correlation and can fit the adsorption process of molybdenum ions.ΔH > 0 indicates that the ion exchange process is the endothermic process,and the thermodynamic func-tion ΔG < 0 indicates that the process of adsorption of molybdenum ions in D314 resin can be spontane-ously carried out. ΔS > 0 indicates that molybdenum ion adsorption is entropy increasing process. Quasi-second-order kinetic model with a correlation coefficient of R2 above 0. 99 can be well fitted in the process of adsorption of molybdenum ions by D314 resin. Particle diffusion is the main step in the process of mo-lybdenum ion adsorption.