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http://dx.doi.org/10.5012/bkcs.2014.35.6.1817

Simultaneous Adsorption of Chromium (VI) and Phosphate by Calcined Mg-Al-CO3 Layered Double Hydroxides  

Song, Xiulan (College of Environmental Science and Engineering, Taiyuan University of Technology)
Wu, Yuhong (College of Environmental Science and Engineering, Taiyuan University of Technology)
Publication Information
Bulletin of the Korean Chemical Society / v.35, no.6, 2014 , pp. 1817-1824 More about this Journal
Abstract
The adsorption characteristics of chromium (VI) and phosphate on calcined Mg-Al-$CO_3$ layered double hydroxides (CLDH) were investigated in single and binary systems. A series of batch experiments were performed to study the influence of various experimental parameters. In this study, CLDH exhibited a high adsorption capacity for Cr (VI) and P in a single system. The experimental data were close to the theoretical adsorption capacity given by the Langmuir isotherm, the calculating adsorption capacities of Cr (VI) and P were up to 70.42 mg/g and 97.09 mg/g, respectively. It was found that the initial pH was approximately 6 and it took 24 h to reach equilibrium when P and Cr (VI) were added simultaneously. The experimental data were best fitted by a pseudo-second-order kinetics model. Competitive adsorption between Cr (VI) and P existed in the binary system. The presence of Cr (VI) had no significant influence on P adsorption. However, the suppression of Cr (VI) adsorption was obvious when the initial concentration of P was up to 10 mg/L with a concentration of 0.5 g/L of CLDH.
Keywords
Chromium; Phosphate; Layered double hydroxides;
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