ABSTRACT Birnessite and cryptomelane are typical layered and tunnel manganese oxides and both can be used as a heterogeneous catalysts for the degradation of organic wastes using heterogeneous Fenton reaction. The aim of this study was to synthesize birnessite and cryptomelane using 5 variations of reflux times (1, 3, 6, 9 and 12 hours) with precursors of KMnO4 and C6H12O6 using Ag+ (AgNO3) as…