摘要
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 (Δ<i>G</i><sup>0</sup> < 0, Δ<i>H</i><sup>0</sup> > 0, and Δ<i>S</i><sup>0</sup> > 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.
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 (Δ<i>G</i><sup>0</sup> < 0, Δ<i>H</i><sup>0</sup> > 0, and Δ<i>S</i><sup>0</sup> > 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.
作者
Shirendev Nasanjargal
Bat-Amgalan Munkhpurev
Naoki Kano
Hee-Joon Kim
Yunden Ganchimeg
Shirendev Nasanjargal;Bat-Amgalan Munkhpurev;Naoki Kano;Hee-Joon Kim;Yunden Ganchimeg(Department of Chemical Engineering, School of Applied Sciences, Mongolian University of Sciences and Technology, Ulaanbaatar, Mongolia;Graduate School of Science and Technology, Niigata University, Niigata, Japan;Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University, Niigata, Japan)
