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논문 기본 정보

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학술저널
저자정보
Sirtori, Carla (Pesticide Residue Research Group, University of Almeria) Zapata, Ana (Plataforma Solar de Almeria [CIEMAT]) Malato, Sixto (Plataforma Solar de Almeria [CIEMAT]) Gernjak, Wolfgang (Water Management Centre [AWMC], The University of Queensland) Fernandez-Alba, Amadeo R. (Pesticide Residue Research Group, University of Almeria) Aguera, Ana (Pesticide Residue Research Group, University of Almeria)
저널정보
한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제5호
발행연도
2009.1
수록면
644 - 651 (8page)

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In this study, degradation of Flumequine (FLU) and nalidixic acid (NXA) in distilled water by two solar photocatalytic processes, $TiO_2$ and photo-Fenton, was evaluated. Intermediates and acute toxicity of the photoproducts generated were also studied. Degradation efficiency by heterogeneous photocatalysis with $TiO_2$ was similar for NXA and FLU, which were completely degraded after 25 min of illumination. Less NXA mineralisation was reached after 80 min of illumination. Photo-Fenton degradation of both substances was very quick (<25 min of illumination time), and the same mineralisation was reached in both cases. The kinetic parameters of the two substances were calculated for comparison of their photocatalytic degradation. In all cases, photocatalytic processes were associated with a reduction in toxicity, as evaluated by Vibrio fischeri bioassay. Furthermore, a sharp decrease in inhibition was observed from the beginning of the treatment, even when FLU and NXA were still present in the reaction solution (first samples). These results demonstrate that in both photocatalytic processes studied, toxicity decreases significantly, producing a phototreated sample within safe toxicity limits. The intermediates formed during photocatalytic degradation were studied by liquid chromatography-time of flight-mass spectrometry (LC-TOF-MS).

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