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Effect of Phosphate Buffer upon CuO/Al<sub>2</sub>O<sub>3</sub>and Cu (II) Catalyzed Ozonation of Oxalic Acid Solution
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2003
Year
Oxygen Reduction ReactionInorganic ChemistryChemical EngineeringAdvanced Oxidation ProcessEngineeringOxalic AcidIndustrial CatalysisBioremediationPhosphate BufferCatalyzed OzonationCatalysisHomogeneous CuChemistryOxalic Acid SolutionCatalytic ProcessHomogenous Catalytic OzonationWastewater Treatment
Heterogeneous and homogenous catalytic ozonation by CuO/Al2O3 and Cu(II) ion of oxalic acid in aqueous solutions were investigated. At low pH range, the effectiveness of ozone could be clearly increased by the presence of CuO/Al2O3. At neutral pH with phosphate buffer, the oxidation reaction was strongly inhibited, whereas non-buffered experiments confirmed high removal efficiency for oxalic acid. At pH 7.5, the mineralization of oxalic acid could only slightly be boosted by the heterogeneous CuO/Al2O3. Here the application of a homogeneous Cu(II) catalyst in non-buffered oxalic acid solution results in higher DOC removal efficiency.