Equilibrium and Kinetic Studies of the Adsorption of Cr(III) Ions onto Amberlite XAD-8 Impregnated with Di-(2-ethylhexyl) Phosphoric Acid (DEHPA)
Equilibrium and Kinetic Studies of the Adsorption of Cr(III) Ions onto Amberlite XAD-8 Impregnated with Di-(2-ethylhexyl) Phosphoric Acid (DEHPA)
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DOI：
10.1260/0263-6174.29.10.989
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发表时间：
2011-01-01
影响因子：
2.9
通讯作者：
Lupa, Lavinia
中科院分区：
文献类型：
--
作者：
Ciopec, Mihaela;Davidescu, Corneliu Mircea;Lupa, Lavinia
考察了二（2-乙基己基）磷酸（DEHPA）浸渍的Amberlite XAD-8对水中Cr（III）离子的吸附性能。平衡吸附数据符合Langmuir模型。尺寸分离因子R-L的值表示有利的吸附。DEHPA浸渍的XAD-8材料的最大吸附容量为5.64 mg Cr（HI）离子/g。吸附动力学过程符合准二级动力学方程。吸附程度随温度的变化被用来评估该过程的热力学参数。Δ H-0和Δ G（0）值表明吸附过程是自发的吸热过程。吸附活化能也表明吸附过程是吸热的。
The adsorption performance of Amberlite XAD-8 impregnated with di(2-ethylhexyl) phosphoric acid (DEHPA) in the process of Cr(III) ion removal from aqueous solutions was examined. The equilibrium adsorption data were well described by the Langmuir model. The values of the dimensional separation factor, R-L, indicated favourable adsorption. The maximum adsorption capacity of the DEHPA-impregnated XAD-8 material was 5.64 mg Cr(HI) ion/g. The kinetics of the adsorption process were best described by the pseudo-second-order kinetic equation. The variation in the extent of adsorption with temperature was used to evaluate the thermodynamic parameters for the process. The values of Delta H-0 and Delta G(0) obtained showed that the adsorption process was endothermic and spontaneous. The adsorption activation energy also showed that the process was endothermic.