The Removal of Chromium(VI) from Aqueous Solution by Amine-Functionalized Zeolite: Kinetics, Thermodynamics, and Equilibrium Study

Autor:	Bat-Amgalan Munkhpurev, Heejoon Kim, Yunden Ganchimeg, Naoki Kano, Shirendev Nasanjargal
Rok vydání:	2021
Předmět:	Chromium symbols.namesake Aqueous solution Adsorption chemistry Kinetics Inorganic chemistry symbols chemistry.chemical_element Langmuir adsorption model Amine gas treating Zeolite Chemical reaction
Zdroj:	Journal of Environmental Protection. 12:654-675
ISSN:	2152-2219 2152-2197
DOI:	10.4236/jep.2021.129040
Popis:	In this study, the removal of Cr(VI) from aqueous solution by modified zeolite with 3-aminopropyltriethoxysilane was investigated. The effect of various parameters such as pH, contact time, temperature, initial concentration of Cr(VI) ion, common cations, and anions on the adsorption of Cr(VI) was studied. The modified zeolite was characterized by following instrumental analysis of XRD, SEM/EDS, BET, and FT-IR. Based on calculated thermodynamic parameters values (ΔG0 H0 > 0, and ΔS0 > 0) and kinetic properties of the adsorption of Cr(VI) by modified zeolite, it was concluded that the rate-limiting step of the process is a second-order chemical reaction. The results of the adsorption isotherm study confirmed that the adsorption follows the Langmuir isotherm model. The maximum adsorption capacity was 13.5 mg/g.
Databáze:	OpenAIRE
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