A Review on Cr(VI) Adsorption Using Inorganic Materials

Claudia Rosales-Landeros, Carlos Eduardo Barrera-Díaz, Bryan Bilyeu, Víctor Varela Guerrero, Fernando Ureña Núñez

Department of Chemistry, Xavier University of Louisiana, New Orleans, USA.
Instituto Nacional de Investigaciones Nucleares, Ocoyoacac, México.
Unit El Rosedal, Research Joint Center in Sustainable Chemistry UAEM-UNAM, Toluca, México.

DOI: 10.4236/ajac.2013.47A002                

Abstract

Chromium compounds are widely used in electroplating, metal finishing, magnetic tapes, pigments, leather tanning, wood protection and electronic and electrical equipment. Hexavalent chromium is a highly toxic metal and produces health damages. The most soluble, mobile and toxic forms of hexavalent chromium in soils are chromate and dichromate and the chromium distribution is also controlled by redox processes, its adsorption decreases with increasing pH and when competing dissolved anions are present. Several techniques have been developed to remove Cr(VI) from wastewater but these techniques have disadvantages such as high cost, non-selective, pH dependence, etc. The use of low cost sorbents has been investigated as a replacement for current costly methods; natural materials with a high adsorption capacity for heavy metals can be obtained. Modification of the sorbents can improve adsorption capacity. This paper includes some techniques for remove Cr(VI) with clays, silica and zeolites from aqueous solutions, some of the treated adsorbents show good adsorption capacities.

Keywords

Sorption; Hexavalent Chromium; Clay; Silica; Zeolites

Conflicts of Interest

The authors declare no conflicts of interest.

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