作　　者： ; ; ; ; ;

机构地区： 海南师范大学化学与化工学院

出　　处： 《化学学报》 2009年第5期355-360,共6页

摘　　要： 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 properties of the D301R resin towards Fe（Ⅲ） substituted heteropolyanion PW11O39Fe（Ⅲ）（H2O）^4- （PW11Fe） and impacts of pH and temperature on the adsorption were investigated in detail. The adsorption kinetic curves and adsorption isotherm curves were also determined at different temperature. It was found that the adsorption capacities of PW11Fe on the resin increased with pH increase in the aqueous solution from 2 to 8, and decreased with the increase of temperature. The adsorption kinetics follows the pseudo-second-order model controlled by a surface process. The rate constant k2 is 9.33×10^-4 g·mg^-1·min^-1, which decreased with the increase of temperature, The adsorption isotherm curve is consistant with Freundlich isotherms and the adsorption enthalpy calculated is about 40 kJ·mol^-1, indicating a physical adsorption process.

关 键 词： 阴离子交换树脂 铁取代杂多阴离子 吸附动力学 吸附等温线

领　　域： [理学] [理学] [化学工程]