D301大孔树脂吸附钒(V)的性能研究

研究了D301大孔树脂对钒的吸附性能.结果表明,pH值对D301树脂吸附钒的影响很大,与钒在溶液中的赋存状态有关,且在pH=2时吸附效果最好:测得吸附热力学参数分别为:△H=8.97kJ/mol,△G_(313)=-5.69kJ/mol,△G_(303)=-5.2kJ/mol,△G_(293)=-4.9kJ/mol,△S=46.84J/mol·K.等温吸附服从Freundlich经验式;考察了溶液浓度、搅拌速率对交换过程的影响,并对实验数据运用相关理论模型进行拟合,结果显示钒(V)在D301树脂上吸附交换过程控制步骤为颗粒扩散控制,反应级数n为0.2391.

STUDY ON THE ADSORPTION BEHAVIOR OF D301 RESIN FOR VANADIUM (V)

The adsorption behavior and mechanism of D301 resin for vanadium(V) were studied. The results indicated that pH had a great effect on the adsorption of D301 resin for vanadium(V)due to the change of composition of vanadium(V) in solution, and the largest adsorption amount was obtained at pH of 2. The parameters of adsorption thermodynamics were △H=8.97kJ/mol, △G_(313)=-5.69kJ/mol, △G_(303)=-5.2kJ/mol, △G_(293)=-4.9kJ/mol, △S=46.84J/mol·K, respectively. The adsorption behavior of D301 resin for vanadium(V) obeyed the Freundlich isotherm, and the affecting factors of the ion exchange process such as the concentration of vanadium(V), speeds of stirring and temperature were investigated in detail. Some theoretical models were applied to fit the experimental data, and the results showed that the dominant step for the adsorption of D301 resin for vanadium(V) was ion diffusion through particle, and order reaction (n) was 0.2391.