Enhancing the adsorption of chromium(VI) from the acidic chloride media using solvent impregnated resin (SIR).

Chemical Engineering Journal, Volume 219, 1 March 2013, Pages 174-182.
Nghiem Van Nguyen, Jae-chun Lee, Jinki Jeong, B.D. Pandey.

Resources Recycling, University of Science and Technology, Daejeon 305-350, Republic of Korea

Mineral Resources Research Division, Korea Institute of Geoscience and Mineral, Resources (KIGAM), Daejeon 305-350, Republic of Korea

School of Environmental Science and Technology, Hanoi University of Science and Technology, Hanoi, Viet Nam

Metal Extraction and Forming Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831 007, India.

 

Abstract

In this study, the solvent impregnated resin (SIR) based on impregnation of Cyanex 923 in Amberlite XAD-7HP resin was used to remove hazardous chromium(VI) from the acidic chloride media. The results showed that SIR adsorbed chromium effectively when the solution pH was low (acidity of solution; 0.3–2.0 M). The adsorption mechanism of the SIR for chromium(VI) could be explained taking into account the interaction between the protonated oxygen atoms of polyacrylate (ester group) in the resin and the solvation of Cyanex 923 with trioxochloromate (CrO₃Cl^–) complexes. The involvement of both the polymeric support and extractant for chromium adsorption enhanced uptake capacity of SIR to 28.2 mg Cr/g SIR (1.0 g SIR contained 0.375 g the extractant) compared to that of 16.9 mg Cr/g resin. Freundlich isotherm was more suitable than Langmuir isotherm and Thomas model described well the adsorption behavior of chromium in column. Chromium was eluted effectively from chromium-loaded SIR by 0.1 M sodium hydroxide solution, and elution efficiency reached 92% in the first stage. The regenerated SIR when reused for adsorption of chromium showed almost the same level of efficiency at least in three cycles.

 

 

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