Synthesis and Characterisation of Manganese Oxides from Potassium Permanganate and Citric Acid Mixtures

摘要

Reaction of KMnO_4 and citric acid at different stoichiometric ratio found to give black precipitate after calcined at 500 °C. The black precipitate are classified as two type of manganese oxides mineral namely as bixbyite and hollandite. IR and XRD data were in agreement with the literature report.