Production of KMnO4Loaded Activated Carbon from Sacha Inchi Seed Shell by Low Activation Temperature Treatment for Methylene Blue Removal

Abstract

The production of activated carbon from sacha inchi seed shell for methylene blue removal was studied. The effects of KMnO4impregnation ratios (0-5% wt./wt.) and activation temperature (250-400°C) were evaluated. It was found that the optimum activating temperature and impregnation ratio are 350°C and 1 wt.% KMnO4, respectively. The product made under these conditions is stable and suitable for adsorption in aqueous solution. Maximum methylene blue adsorption was achieved at pH 3 and with a relative decrease to about 95-96% adsorption efficiency between pH 4 and 9. The equilibrium adsorption data showed a good fit with the Freundlich isotherm exhibiting 99.80 mgg˗1adsorption capacity