tailieunhanh - Mn-Fe binary oxide incorporated diatomite for phenol oxidation reaction

The Mn-Fe-diatomite exhibited catalytically synergized properties of iron and manganese oxide. The phenol oxidation by H2O2 using Fe-Mn-diatomite as a catalyst was conducted. The phenol with 1000 ppm was minerized completely after 60 minutes while phenol was only oxidized to catechol and hydroquinone with using single MnO2 or Fe2O3. | Fig. 4 show HPLC diagrams of phenol oxidation products. The main products including catechol, hydroquinone were identified by standard materials. The name of products were noted in diagrams. Unfortunely, we have not identified the products that appeared early residual times around 2 min. It may be organic acid with molecular weight such as acetic acid, formic acid or oxalic acid. Manganese oxide exhibited very poor phenol oxidation. Phenol is almost oxidized after 60 minutes while iron oxide provide good phenol oxidation but the phenol oxidation did not occur completely. It still remain huge amount of intermediates of dihydroxylphenon such as catechol and hydroquinone. The dihydroxylphenols as toxic materials to aqueous environment are stable and hard to degradate by biological or chemistry processes. The phenol oxidation over Mn-Fe-diatomite catalyst occurred almost completely to form organic acids with low molecular weight. The combining iron oxide and manganese oxide coating over diatomite provided excellent catalyst for completely phenol oxidation. High oxidation reactivity of Mn-Fe-diatomite needs to further study but we thought that it is related multiple oxidation states of manganese and iron.

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