Article ID Journal Published Year Pages File Type
1515241 Journal of Physics and Chemistry of Solids 2016 9 Pages PDF
Abstract

•Catalytic degradation of methylene blue and methyl orange with MnO2-coated Diatomite.•A simple wet-chemical method is adopted to synthesize MnO2-diatomite nanocomposite.•Large surface area into porous matrix of biosilica provides high active sites.•Reduction of MnIV to MnII produces hydroxyl radicals to chemically degrade the dyes.•Layered structure of birnessite MnO2 provides adsorption of dye molecules.

By a simple wet-chemical procedure using a permanganate in the acidic medium, diatomite coated with amorphous manganese oxide nanoparticles was synthesized. The structural, microstructural and morphological characterizations of the as-synthesized catalysts confirmed the nanostructure of MnO2 and its stabilization on the support - diatomite. The highly efficient and rapid degradation of methylene blue and methyl orange over synthesized MnO2 coated Diatomite has been carried out. The results revealed considerably faster degradation of the dyes against the previously reported data. The proposed mechanism of the dye-degradation is considered to be a combinatorial effect of chemical, physicochemical and physical processes. Therefore, the fabricated catalysts have potential application in waste water treatment, and pollution degradation for environmental remediation.

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Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
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