Abstract
The Fe-doped octahedral molecular sieve manganese oxides have been successfully synthesized by one-pot synthesis of the reaction between KMnO4 and glucose using sol-gel methods. The oxide products are then characterized by various techniques such as X-ray diffraction, scanning electron microscopy, atomic absorption spectroscopy and average oxidation state (AOS) of manganese in manganese oxides. The as-synthesized manganese oxide and Fe-doped manganese oxides are used as catalysts for the degradation of methylene blue dye using hydrogen peroxide as oxidants. The results indicated that the Fe-doped manganese oxide catalyst displayed much enhanced catalytic activities compared to undoped manganese oxide for methylene blue degradation. The differences in catalytic activities have been correlated with the difference in surface properties and crystallinity.
Highlights
The use of synthetic dyes as coloring agents has increased tremendously over the past few decades due to the rapid production of dye materials
We report the synthesis of Fe-doped cryptomelane manganese oxides catalysts using a simple approach by the reacting whole reactants including dopant in the single step
Gao et al [5] reported the doping of transition metals (Cu, Ni, Co, Fe) in the cryptomelane and no new peaks are identified upon dopant addition, but the intensity of reflection peak (211) enhanced as the dopant was inserted into the cryptomelane
Summary
The use of synthetic dyes as coloring agents has increased tremendously over the past few decades due to the rapid production of dye materials. It requires additional post-treatment after the complete dye degradation achieved since the catalyst dissolves in the final products
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