HFO复合树脂对磷酸盐的吸附等温线与动力学研究

Research on Adsorption Isotherms and Kinetics of Phosphate by HFO Composite Resin

试验考察了HFO-N和HFO-B两种复合树脂对磷酸盐的吸附效果,研究了其吸附等温线与吸附动力学。结果表明:初始浓度对HFO-N复合树脂吸附效果的影响不大,而HFO-B复合树脂对磷酸盐的吸附去除率随初始浓度的增大而降低;HFO-N复合树脂对磷酸盐的平衡吸附量远远大于HFO-B复合树脂;不同反应温度下两种树脂的吸附均能很好地符合Freundlich吸附模型,HFO-N复合树脂同时能够较好地符合Langmuir吸附等温线模型;不同磷酸盐初始浓度时,准一级动力学与准二级动力学模型能较好拟合HFO-N树脂对的吸附行为,而准二级动力学方程能较好地拟合HFO-B型树脂吸附磷酸盐的行为。

The adsorption effect, adsorptionisotherm and kineticsof HFO--N and HFO--B composite resins on phos- phate were investigated in the experiments. The results showed that the initial concentration had little effect on the phosphate adsorption of HFO-N composite resin.And the phosphate removal rate by HFO-B composite resin de- creased with the increase of initial concentration. The equilibrium adsorption capacity of phosphate by HFO-N com- posite resin was much larger than that of HFO-B composite resin. The adsorption of the two resins at different reac- tion temperatures was in good agreement with Freundlich adsorption model. The adsorption of HFO-N composite resin could well fit the Langmuir adsorption isotherm model. Both the quasi-first-order kinetics equation and the quasi-second-order kinetics equation could well fit the adsorption behavior of HFO-N resin on phosphate at dif- ferent initial phosphate concentrations.. The adsorption behavior of HFO--B resin on phosphate was more consistent with quasi-second-order reaction equation.