Renuga Devi N, Manjusha.K and Lalitha P
The present study is focused on removal of hexavalent chromium from aqueous solution using an eco-friendly adsorbent, activated carbon prepared from the pods of Delonix regia. The effect of optimum dosage, pH and initial concentration of adsorbate on the effective removal of hexavalent chromium has been studied. The results of the study show the adsorption of Cr(VI) to be concentration and pH dependent. The maximum removal of Cr(VI) was observed at pH 2. Removal of Cr(VI) increased from 70.58% to ~100% with increasing adsorbent dosage from 50 to 200 mg. The adsorption process was found to obey Langmuir adsorption isotherm and Freundlich adsorption isotherm. Hence the use of the low cost carbon prepared is of practical importance and is expected to be economical.
