1. Sampa C, Basab C, Sekhar B (2008) On the removal of hexavalent chromium from wastewater: a comparative study between photocatalytic and chemical reduction process. In: Proceedings of the 6th WSEAS Int. Conference on ENVIRONMENT, ECOSYSTEMS and DEVELOPMENT (EED’08), pp 32–37
2. Wang X, Pehkonen S, Ray A (2004) Removal of aqueous cr(VI) by a combination of photocatalytic reduction and coprecipitation. Ind Engg Chem Res 43:1665–1672
3. Dalia MS, Drwesesh M (2006) Removal of cr6+ ions from wastewater in presence of quaternary ammonium salts. Egypt J Aqua Resc 32:1–11
4. Das N, Vimala Karthika P. (2007) Biosorption of heavy metals- an overview. Ind J Biotec 7:159–169
5. Gupta S, Bhathacharyya S (2005) Intercation of metal ions with clay: A case study with Pb(II). Appl Clay Sci 36:199–208