Original Articles: 2014 Vol: 6 Issue: 6
The removal of chromium from aqueous solution by using green micro algae
Adsorption is a unique process for the removal of pollutants from water and wastewater since the process is cost effective, easily adoptable and environmentally compatible. The micro algae are a promising way to produce a useful adsorbent for Chromium (VI) removal from aqueous solution. The specific surface area of the activated carbon was determined and its properties studied by scanning electron microscopy (SEM). Adsorptive removal of Chromium (VI) from aqueous solution on micro algae has been studied under varying conditions of agitation time, metal ion concentration, adsorbent dose and pH to assess the kinetic and equilibrium parameters. Adsorption equilibrium was obtained in 120 min for 20 to 120 mg/L of Chromium (VI) concentrations. The Langmuir, Freundlich, Temkin, Redlich-Peterson, Khan equilibrium isotherm models were found to provide an excellent fitting of the adsorption data. In equilibrium isotherm, the r2 values obtained were in the range of 0.2 to 1 (0.999 to 0.857) for Chromium (VI) concentration of 20 to 120mg/L, which indicates favorable adsorption of Chromium (VI) onto marine algae carbon. The adsorption capacity of Chromium (VI) 99.75%. The percent removal maximum in pH3. This adsorbent was found to be effective and economically attractive.