摘要：Among various organic and inorganic pollutants, heavy metal ions are very toxic and carcinogenic in nature. The presence of heavy metals in the aquatic environment has been of great concern because of their toxicity at lower concentrations. In India, several other industrial effluents contribute to contamination of river and groundwater by Cr. Chromium in excess amounts can be toxic especially the hexavalent form. Fly ash is one of the most abundant industrial waste materials and it can be used for the removal of toxic metal ions. In this study, adsorption of Chromium (VI) was investigated by fly ash from aqueous solutions. Fly ash samples were collected from Shri Ram Fertilizers and Chemicals Ltd. (SRFC) Kota, Rajasthan. Physico – chemical analysis was performed of collected fly ash samples. The sorption of Cr (VI) ions by batch method is carried out. U.V. Visible spectrophotometric method was used for Chromium (VI) determination. The study investigates the effect of initial metal ion concentration, adsorbent doses and pH of solution. The result indicate that the adsorption increases with increasing amount of fly ash and initial chromium concentration. Adsorption is maximum on pH 2 and decreases with increasing pH. Various adsorption kinetic models were tested in understanding the adsorption kinetics and it was found that the adsorption was controlled by intra-particle diffusion model.
