Heavy metal contamination of water is a grave environmental problem because of their potential toxic nature. Especially hexavalent chromium among the various heavy metals is a major global pollutant in this century. Threat to natural sources of water and hence to human health due to heavy metal pollution is of a serious degree. Selection of a method among the various technologies available merits adsorption of chromium by low cost materials as the best. This is a relatively new tool which has not been put to use on a large scale. Adsorption has evolved as the front line of defense for...