Photodegradation of fungicide triadimefon and pesticide pirimicarb in aqueous TIO2 suspension |
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Authors: | K Satya Narayana Reddy Teruaki Hisanaga Keiichi Tanaka |
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Institution: | National Institute of Materials and Chemical Research , 1–1, Higashi, Tsukuba, Ibaraki, 305, Japan |
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Abstract: | Two agrochemicals composed of nitrogen‐containing heterocyclic ring, triadimefon and pirimicarb, were degraded photocatalytically. The disappearance and TOC elimination rates of triadimefon were close to those of pirimicarb, whereas the photolysis of triadimefon was 4 times slower than that of pirimicarb. For triadimefon its aromatic moiety degraded quickly and Cl‐ was released immediately, while triazole moiety degraded slowly. The formation rates of NH+ 4 and NO3 ‐ by the degradation of triazole moiety were influenced by the rest of the molecule. The difference between disappearance and TOC elimination rates of both triadimefon and pirimicarb were far larger than those of aromatic compounds. |
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Keywords: | Photocatalyst TiO2 triadimefon pirimicarb triazole |
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