Effect of Phosphate Buffer upon CuO/Al2O3and Cu (II) Catalyzed Ozonation of Oxalic Acid Solution
- 1 October 2003
- journal article
- research article
- Published by Taylor & Francis in Ozone: Science & Engineering
- Vol. 25 (5) , 393-397
- https://doi.org/10.1080/01919510390481711
Abstract
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.Keywords
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