Equilibrium, thermodynamic, and kinetic modeling studies for the adsorptive removal of oxyanions from water
- 21 December 2021
- journal article
- research article
- Published by Taylor & Francis Ltd in Separation Science and Technology
- Vol. 57 (12), 1884-1899
- https://doi.org/10.1080/01496395.2021.2009869
Abstract
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 (R2 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 (ΔH°, ΔS°, and ΔG°) 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. Graphical abstractKeywords
This publication has 39 references indexed in Scilit:
- Studies on adsorption behavior of Cu (II) and Cd (II) onto aminothiophene derivatives of Styrene Maleic anhydride copolymerJournal of the Taiwan Institute of Chemical Engineers, 2016
- Calixarenes and BeyondPublished by Springer Science and Business Media LLC ,2016
- Sorption of As(III) by calix[4]arene modified XAD-4 resin: kinetic and thermodynamic approachJournal of the Iranian Chemical Society, 2014
- Anion Extraction Properties of a New “Proton-Switchable” Terpyridin-Conjugated Calix[4]areneIndustrial & Engineering Chemistry Research, 2014
- New Calix[4]arene Appended Amberlite XAD-4 Resin with Versatile Perchlorate Removal EfficiencyJournal of Chemical & Engineering Data, 2013
- Novel Calix[4]arene-based Amberlite XAD-4 Modified Resin for As(III) Removal from WaterCLEAN - Soil, Air, Water, 2012
- Hexavalent chromium adsorption on impregnated palm shell activated carbon with polyethyleneimineBioresource Technology, 2010
- Synthesis and oxoanions (dichromate/arsenate) sorption study of N-methylglucamine derivative of calix[4]arene immobilized onto poly[(phenyl glycidyl ether)-co-formaldehyde]Journal of inclusion phenomena and molecular recognition in chemistry, 2009
- Perspective on "Density functional thermochemistry. III. The role of exact exchange"Theoretical Chemistry Accounts, 2000
- Density-functional thermochemistry. I. The effect of the exchange-only gradient correctionThe Journal of Chemical Physics, 1992