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Kinetics and Thermodynamics Study of Thiosulfate Removal from Water by Calcined MgAl-CO3 Layered Double Hydroxides

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Abstract:

Layered double hydroxides (LDHs) are potential scavengers for anionic contaminants due to their “memory effect”. Here we report the removal of thiosulfate anion from contaminated water by calcined MgAl–CO3 LDH (CLDH). The results indicate that CLDH exhibits a good performance in adsorption of thiosulfate.We studied the kinetics and thermodynamics of adsorption of thiosulfate from water. The equilibrium isotherm showed that the uptake of thiosulfate anion well agrees with the Langmuir equation, the positive value of △HӨ demonstrates the endothermic feature of the adsorption, the pseudo-second order kinetics model can be uItalic textsed to describe the uptake process and the value of Ea was calculated to be 75.898 kJ/mol. Our results suggest that the process of thiosulfate uptaking was controlled by the reaction rate of thiosulfate with the CLDH rather than diffusion.

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Periodical:

Advanced Materials Research (Volumes 396-398)

Pages:

880-885

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.396-398.880

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Online since:

November 2011

Authors:

Cui Yu Geng, Xiao Yu, Zheng Chang, Xiao Dong Lei, Xiao Ming Sun, Liang Luo

Keywords:

Adsorption, Hydrotalcite, Layered Double Hydroxides (LDHs), Thiosulfate

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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