D401大孔树脂吸附锰铁混合液中Fe^(3+)的热力学和动力学研究

Study on adsorption kinetics and thermodynamics of Fe^(3+) from ferromanganese mixture by D401 macroporous resin

采用D401树脂对锰铁混合液进行静态吸附性能及热力学、动力学研究,考察了Fe3+浓度、pH值和温度等对静态吸附Fe3+的影响,探讨吸附Fe3+的动力学过程,并采用Langmuir和Freundlich吸附模型对D401树脂吸附Fe3+的静态等温曲线进行了拟合。结果表明,在pH=1.5,温度313 K,Fe3+的最大静态吸附量是115.7 mg/g;D401对Fe3+吸附遵循Langmuir方程;△H Fe3+>0,ΔG Fe3+<0,表明D401对Fe3+的吸附是自发吸热过程;D401树脂对Fe3+的吸附符合拟二级动力学方程,颗粒扩散过程是吸附的控速步骤。静态吸附实验表明,D401大孔树脂能有效的对锰铁混合液中铁锰离子进行分离。

The static adsorption properties,thermodynamics and kinetics of D401 resin for Fe3＋ solution were studied.Not only the influences of concentration of Fe3 ＋,pH value and temperature on static adsorption were investigated,but also the kinetics of Fe3 ＋ adsorption was explored.Langmuir and Freundlich adsorption isotherm equation were studied to fit the adsorption curve of D401 resin for Fe3＋.The results showed that the saturation adsorption capacity of resin is 115.7 mg/g,pH value is 1.5 and temperature is 313 K.Langmuir equation has a higher correlation than Freundlich to fit the D401 resin for adsorption of Fe3 ＋.Thermodynamic analysis indicated a spontaneous endothermic process for the adsorption of Fe3 ＋ on the resin.The exchange adsorption rate is mainly controlled by process of particle diffusion,and second order reaction.The date of static adsorption show that iron and manganese ion can be efficiently separated by the D401 macroporous resins from the solution of ferromanganese mixture.