Abstract:
The doped Co-cryptomelane type manganese oxide catalysts were prepared using two type approaches, direct and indirect methods. The products were obtained by the reaction between KMnO4, glucose and small quantity of CoNO3 as dopan using sol-gel method. The as-synthesized Co-cryptomelanes was then characterized by XRD for the phase structure, crystallinity and purity and SEM for morphology. The XRD results indicated that both synthetic method displayed the same cryptomelane phase and the same morphology. The K+ ions in the tunnel of cryptomelane (direct method) are more readily replaced by Co that that synthesized using indirect method. ;The as-synthesized Co-cryptomelane product was then applied for the degradation of methylene blue dye using H2O2 as an oxidant. The maximum degradation of MB was 87,05% using Co-cryptomelane synthesized using direct method for 120 minutes of reaction times.
