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Mechanism of clomazone photocatalytic degradation: hydroxyl radical, electron and hole scavengers

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Abstract

The role of •OH radicals (adsorbed and free) and valence band holes as primary oxidants in the photodegradation of clomazone in UV-illuminated TiO2 suspension was investigated. Significant inhibition of the photodegradation of clomazone in the presence of NaI (hole and surface •OH scavenger) suggesting that the surface degradation mechanism played a crucial role rather than the bulk degradation pathway. Also, less impact of tert-butanol on the photodegradation indicated that free •OH radicals were not majorly involved in the photodegradation process of clomazone. On the other hand, when the surface is covered by fluoride, it was concluded that the kinetic pathways for reaction with subsurface holes and with free •OH in solution are predominant. The LC–ESI–MS/MS analyses of the irradiated solution of clomazone in the presence of NaF indicated formation of the same intermediates when free •OH played a crucial role in mechanism instead of surface •OH radicals. Besides, molecular oxygen, H2O2, KBrO3, and (NH4)2S2O8 are generally used as electron scavengers in heterogeneous photocatalytic reactions. It was found that the addition of electron scavengers such as H2O2, KBrO3, and (NH4)2S2O8 has resulted in higher pollutant degradation rate compared to molecular oxygen alone.

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Acknowledgments

The authors greatly appreciate the financial support from the Ministry of Education, Science and Technological Development of the Republic of Serbia (Project No. 172042).

Conflict of interest

All authors confirm that there is not any actual or potential conflict of interest including any financial, personal or other relationships with other people or organizations within three years of beginning the submitted work that could inappropriately influence, or be perceived to influence, their work.

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Authors and Affiliations

  1. Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000, Novi Sad, Serbia

    Biljana Abramović, Vesna Despotović, Daniela Šojić & Nina Finčur

Authors
  1. Biljana Abramović
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  2. Vesna Despotović
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  3. Daniela Šojić
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  4. Nina Finčur
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Correspondence to Biljana Abramović.

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Abramović, B., Despotović, V., Šojić, D. et al. Mechanism of clomazone photocatalytic degradation: hydroxyl radical, electron and hole scavengers. Reac Kinet Mech Cat 115, 67–79 (2015). https://doi.org/10.1007/s11144-014-0814-z

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  • DOI: https://doi.org/10.1007/s11144-014-0814-z

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