Oxidative leaching of chromium from layered double hydroxides: Mechanistic studies

Bulletin of materials science

P Vishnu Kamath¹  A V Radha¹ 

[1] Department of Chemistry, Central College, Bangalore University, Bangalore 560 001, India$$Department of Chemistry, Central College, Bangalore University, Bangalore 560 001, IndiaDepartment of Chemistry, Central College, Bangalore University, Bangalore 560 001, India$$

关键词: Layered double hydroxide;    stichtite;    oxidative leaching;    dissolutionâ€�?�reprecipitation.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The layered double hydroxide (LDH) of Zn with Cr on treatment with a hypochlorite solution releases chromate ions as a result of oxidative leaching by a dissolutionâ€�?�reprecipitation mechanism. The residue is found to be ðœ�?-Zn(OH)₂. The LDH of Mg with Cr on the other hand is resistant to oxidative leaching. In contrast, a X-ray amorphous gel of the coprecipitated hydroxides of Mg and Cr yields chromate ions. These results suggest that the oxidation potential of Cr(III) in LDHs is determined by the nature of the divalent ion and the crystallinity of the phase while being unaffected by the nature of the intercalated anions.

【 授权许可】

Unknown