Abstract

In the present study, adsorption isotherms and thermodynamics were performed using aqueous solutions of chromium (VI) and an anion exchange resin which was have not yet been characterized for this ion. The adsorption results were fitted to Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin-Pyzhev sorption models. The highest correlation factor (R²) was observed for the Freundlich isotherm which indicates sorption upon a heterogeneous surface. The thermodynamic parameters such as the Gibb’s free energy (ΔG°), the standard enthalpy (ΔH°), and the standard entropy (ΔS°) were determined, indicating that the chromium (VI) adsorption process was spontaneous and endothermic. This study contributes to a clearer understanding of the Cr (VI) adsorption onto the studied anion resin. Our target is to found materials suitable with the world’s growing interest in the treatment of wastewater.

摘要

在本研究中，吸附吸附等温线和热力学是使用铬（VI）和阴离子交换树脂的水溶液进行的，该树脂尚未对此离子进行表征。吸附结果适用于Langmuir，Freundlich，Dubinin-Radushkevich和Temkin-Pyzhev吸附模型。最高相关因子（R ²观察到了Freundlich等温线，表明吸附在异质表面上。确定了吉布自由能（ΔG°），标准焓（ΔH°）和标准熵（ΔS°）等热力学参数，表明铬（VI）的吸附过程是自发的并且是吸热的。这项研究有助于更清楚地了解Cr（VI）吸附在所研究的阴离子树脂上。我们的目标是找到对废水处理感兴趣的材料。