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Received July 11, 2017
Accepted March 28, 2018
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Adsorption of fluoride by the calcium alginate embedded with Mg-Al-Ce trimetal oxides
1Institute of Environmental Science and Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, 410083, P. R. China 2School of Municipal and Mapping Engineering, Hunan City University, Yingbin East Road 518, Yiyang Hunan, 413000, P. R. China
zhoukg63@163.com
Korean Journal of Chemical Engineering, August 2018, 35(8), 1636-1641(6), 10.1007/s11814-018-0056-2
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Abstract
Batch experiments were conducted to study the adsorption performance of fluorine removal by the calcium alginate (SA) embedded by the composite Mg-Al-Ce oxides (SA-CMAC). The physical and chemical properties of the SA-CMAC were characterized by XRD, SEM and XPS analysis. The optimum conditions for fluoride removal were determined and the maximum adsorption capacity was 26.12mg g?1. The co-existing PO4 3- and CO3 2- anions in_x000D_
solution had more effect than the SO4 2- and NO3 - on the fluoride removal efficiency. The adsorption process of fluorine by SA-CMAC was attributed to ion exchange on the surface of the SA-CMAC. The experimental data fitted both the isotherms and Freundlich well, and the Freundlich model had a little higher correlation coefficient. As the rate determining step, the adsorption process could be best described by the pseudo-second order kinetic model followed by the intra-particle diffusion. The thermodynamic examination demonstrated that the fluoride adsorption on the SA-CMAC beads was reasonably spontaneous and exothermic. The reclaimed adsorbents still could adsorb 65% of the total fluoride in the solution after three cyclic processes using 0.01mol/L NaOH.
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References
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