Adsorption of hexavalent chromium using dried macro-alga Sargassum hornschuchii was studied under controlled laboratory conditions. Experimental parameters such as contact time, biomass dosage and pH were studied in a metal concentration of 25 mg L-1. The adsorption of chromium was fast at the initial phase of study and gradually with time became slowly. The maximum removal percentage of chromium was statistically significant and it was found to be 99.36% at 36 hrs and pH 3 using 8 g L-1 algal dosage. Five consecutive adsorption / desorption cycles were operated on metal solution using 0.1 M NaOH and 0.1 M HCl. It was found that chromium adsorption decreased following each adsorption / desorption cycle. Results indicated the superiority of HCl for the recovery of chromium from algal biomass. The present investigation shows that the locally biosorbent Sargassum hornschuchii possesses high adsorption performance with regard to the removal of chromium from its aqueous solution.
Adsorption; Chromium; Removal percentage; Sargassum hornschuchii