Effect of Temperature on Microstructure and Cr(VI) Adsorption Capacity of MgAl Metal Oxides

doi:10.3724/SP.J.1077.2014.13443

Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (5): 529-533.DOI: 10.3724/SP.J.1077.2014.13443

• Research Paper • Previous Articles Next Articles

Effect of Temperature on Microstructure and Cr(VI) Adsorption Capacity of MgAl Metal Oxides

XU Li-Hua, ZENG Hong-Yan, LIAO Meng-Chen, XU Sheng, ZHANG Zhi-Qing, Li Qiao

(School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China)

Received:2013-08-30 Revised:2013-10-28 Published:2014-05-20 Online:2014-04-24
About author:XU Li-Hua. E-mail:xulihua_kami@163.com
Supported by:
Key Project of Hunan Provincial Natural Science Foundation of China (12JJ2008); Open Project of Hunan Provincial University Innovation Platform (12K048); Hunan Province Undergraduate In-novative Experiment Program (2012)

Abstract

Abstract: The adsorption properties of Cr(VI) on the double oxides (LDO) from calcined MgAl hydrotalcites (LDH) were investigated. The effect of temperature on the adsorption performances of the LDO was studied, and the adsorption kinetics and thermodynamics were studied at different adsorption temperatures. The samples were characterized by XRD and FT-IR to clarify the adsorption mechanism．The results indicated that CrO₄^2– had intercalated into the interlayer structures of Mg-Al hydrotalcites. Moderately increasing temperature was beneficial for the reconstruction of LDH crystalline structure from LDO. In the temperature range of 20℃–60℃, adsorption capacity of the LDO was increased with temperature rising, it reached 91 mg/g in the temperature range from 50℃ to 60℃. The experimental data were well fit to the Langmuir equation. The negative values of ΔG_o indicated that the adsorption process was spontaneous, and positive values of ΔH_o and ΔS_o showed the endothermic and entropy-increasing nature of the process. The adsorption was consistent with the pseudo-second order kinetic model. The active energy value was 20.04 kJ/mol, which implying that the internal diffusion was the rate-determining step in the chemical adsorption.

Key words: MgAl metal oxides, adsorption, chromium(VI)

CLC Number:

TB321

XU Li-Hua, ZENG Hong-Yan, LIAO Meng-Chen, XU Sheng, ZHANG Zhi-Qing, Li Qiao . Effect of Temperature on Microstructure and Cr(VI) Adsorption Capacity of MgAl Metal Oxides[J]. Journal of Inorganic Materials, 2014, 29(5): 529-533.

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Effect of Temperature on Microstructure and Cr(VI) Adsorption Capacity of MgAl Metal Oxides

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