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Sintesis Oksida Mangan Dengan Metode Hidrotermal Untuk Mendegradasi Zat Warna Metilen Biru : Efek Perbandingan Mol Pereaksi
Manganese oxide material is a compound that is currently developing, this is because it has a variety of applications. Manganese oxide compounds that are widely known are bright green MnO solids, Mn3O4, Mn2O3 and MnO2 which are black and these oxides are found naturally in nature are MnO2, Mn2O3, Mn3O4 and MnO. Manganese oxide synthesis can be done by solid state, hydrothermal, microwave irradiation, sol-gel and chemical vapor deposition (CVD) methods. The purpose of this study is to examine the catalytic activity of catalysts that have been synthesized using the hydrothermal method. The structure of the synthesized manganese oxide was determined by XRD while the lattice vibrations of manganese oxide were determined by FTIR and Raman spectroscopy. Determination of the average oxide level of manganese oxide is determined by the back titration method. The results of XRD show the presence of hausmanite, cryptomelane and birnessite phases. FTIR spectroscopy results show the presence of O-Mn vibrations at wavelengths of 468 cm-1, 487cm-1, and 726 cm-1. Raman spectroscopy results produced specific vibrations of hausmanite on MnOx/2:3 and MnOx/3:1 catalysts at 655 cm-1 and 653 cm-1, respectively. The average level of Mn oxidation on the MnOx catalyst that has been synthesized shows that there is an oxygen vacancy (defect) which is shown by the low result of 3.45. MnOx catalyst was tested for catalytic activity using UV-Vis spectroscopy for methylene blue degradation and the degradation results with MnOx/(2:3)/6 hours, MnOx/(2:3)/12 hours, MnOx/(3:1)/6 hours and MnOx/(3:1)/12 hours were 89.96%, 89.30%, 89.44%, and 90.76% respectively.
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