期刊
SEPARATION SCIENCE AND TECHNOLOGY
卷 57, 期 12, 页码 1884-1899出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01496395.2021.2009869
关键词
Oxyanions adsorption; equilibrium modeling; DFT calculations; calix[4]arene based resin
This study successfully removed Cr2O7-2, AsO4-3, and ClO4-1 oxyanions from water using DBS resin, with the Langmuir model showing a good correlation coefficient and the adsorption of oxyanions being spontaneous and endothermic. The resin demonstrated good reusability and an in-depth analysis was done on the oxyanions-DBS interactions.
Water is being contaminated by different oxyanions which have many negative effects on the human body. This study deals with the adsorptive removal of Cr2O7-2, AsO4-3, and ClO4-1 oxyanions from water using diethanolaminomethylcalix[4]arene bonded silica (DBS) resin. The capacity of DBS resin for the removal of oxyanions was checked through batch method under the optimized parameters such as pH, adsorbent dosage, concentration of oxyanions, and effect of temperature. The experimental data were analyzed through Langmuir, Freundlich, and Dubinin-Radushkevitch (D-R) adsorption isotherm models and the Langmuir model was the best fit model with a good correlation coefficient (R-2 0.998). The thermodynamic and kinetic studies were performed to check the mechanism and adsorption pathway of oxyanions onto DBS resin. The thermodynamic parameters such as (Delta H degrees, Delta S degrees, and Delta G degrees) describes that the adsorption of oxyanions was spontaneous and endothermic and followed by pseudo second order kinetic models very well. The reusability of resin was also checked and it has been observed that after 27 cycles only 2% loss in adsorption capacity. Moreover, the oxyanions were optimized at the B3LYP/LANL2DZ/6-311++G (d,p) level using G09W software to analyze the oxyanions-DBS interactions phenomenon.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据