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详细研究了D301R弱碱性阴离子交换树脂对Keggin型铁取代杂多阴离子PW11O39Fe(III)(H2O)4-(PW11Fe)的吸附作用,考察了不同pH和温度对吸附量和吸附速率的影响,测定了不同温度下吸附的动力学曲线和吸附等温线,提出吸附动力学模型和计算了吸附的热力学函数,结果表明,在pH2～8的范围内,PW11Fe的吸附量随溶液pH值的升高而增加,随溶液温度的升高而降低;吸附动力学符合表面过程控制的准二级反应模型,其速率常数k2在298K时为9.33×10-4g·mg-1·min-1,并随温度的升高而减小.吸附等温线符合Freundlich吸附模型,吸附热约为40kJ·mol-1,因此,吸附为物理吸附.
The adsorption of Keggin-type iron-substituted heteropolyanion PW11O39Fe (III) (H2O) 4- (PW11Fe) by D301R weakly basic anion exchange resin was studied in detail. The effects of different pH and temperature on the adsorption capacity and adsorption rate were investigated. The adsorption kinetic curves and adsorption isotherms at different temperatures were presented. The adsorption kinetics model and the thermodynamic function of adsorption were proposed. The results showed that the adsorption capacity of PW11Fe increased with the increase of pH , And decreased with the increase of solution temperature. The adsorption kinetics was in accordance with the quasi-second-order reaction model of surface process control. The rate constant k2 was 9.33 × 10-4 g · mg-1 · min-1 at 298K, The adsorption isotherms fit the Freundlich adsorption model, and the adsorption heat is about 40 kJ · mol-1, so the adsorption is physical adsorption.