Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
Volume 50, Issue 8, Pages 571-583Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03601234.2015.1028835
Keywords
Triclopyr; mineralization; Photocatalyzed ozonation; Au-TiO2; deposition-precipitation method
Funding
- National Research Foundation of South Africa
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Triclopyr is a widely used pesticide which is non-biodegradable and enters aquatic systems. The ozone facilitated photocatalyzed degradation and mineralization of Triclopyr using Au-loaded titania as heterogeneous catalyst is reported. The oxidative degradation activity of the hazardous pesticide was investigated at pH 7.8 under varied reaction conditions, including in presence and absence of ozone, titania alone, in presence and absence of light and with different loadings of Au on support. Photocatalysis with 2% Au/TiO2 in the presence of ozone yielded 100% degradation of Triclopyr in 2h. The extent of degradation of pesticide and its mineralization were confirmed by GC-MS. For 10mg/L of Triclopyr, 0.1g/L of catalyst was found to be the optimum for mineralization. Results show that photocatalyzed ozonation with Au/TiO2 as catalyst is a very effective for its removal. No leaching of Au was observed in triplicate runs. Catalyst was fully recoverable and reusable with no loss of activity.
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