SQD201树脂对钒的吸附-解吸行为及机理

通过静态吸附-解吸实验研究了SQD201树脂吸附-解吸钒的交换平衡和动力学特性，考察了pH值、温度和溶液浓度对离子交换过程的影响. 结果表明，在298 K、pH=2.0、溶液浓度为0.040 mol/L条件下，SQD201树脂的静态饱和吸附量为573.80 mg/g；钒在SQD201树脂上的吸附是吸热过程，符合Langmuir等温吸附方程. 吸附和解吸过程主要受颗粒扩散控制，吸附过程的表观活化能为20.41 kJ/mol，解吸表观活化能为22.21 J/mol. 吸附机理分析表明，SQD201树脂主要吸附的钒阴离子为H2V10O284-，H2V10O284-与树脂的理论摩尔比为1:4.

Adsorption and Desorption Behavior and Mechanism of Vanadium on SQD201 Resin

With the static experiments, the exchange equilibrium and kinetics of adsorption and desorption of vanadium by SQD201 resin were studied, the affecting factors of the ion exchange process such as pH, temperature and the concentration of vanadium were investigated in detail. The results indicated that the static saturated adsorption capacity was 573.80 mg/g at the conditions of pH was 2.0, temperature was 298 K and the concentration of vanadium was 0.040 mol/L. The adsorption of vanadium on the resin was an endothermic process. The equilibrium adsorption data fitted to Langmuir isotherms. Kinetics analysis showed that the adsorption and desorption process was mainly governed by ion diffusion through particle, the adsorption activity energy was 20.41 kJ/mol and the desorption activity energy was 22.21 kJ/mol. The results of adsorption mechanism analysis show that the main anion of vanadium adsorbed by SQD201 resin was H2V10O284-, which the theoretical mole ratio with resin was 1:4.