Preparation of Material Based on Biochar - MnOx, Its Morphology, Thermal Stability and Phytotoxicity

Abstract

By reducing potassium permanganate using various methods (microwave radiation, HCl, ethanol, ascorbic acid) in a biochar environment, we have prepared composites of manganese oxides and biochar as an electrode material for elements or supercapacitors. Once identified, the prepared products were tested for thermal stability and phytotoxicity as a safety parameter in case they get in contact with the natural environment. The publication had also discussed progression of thermal decomposition of the composite. The process was exo-thermal with mutual oxidation-reduction reaction between the manganese oxides and biochar carbon. In the article there are also described the adsorption capabilities of prepared products. The manganese oxide content had also influenced the phytotoxicity test results. The biochar itself had stimulating effects on all tested seeds, while composites had shown both stimulating and inhibiting effects, depending on the kind of tested seeds.