Photocatalysis of titanium dioxide to decompose pesticide ethion in tangerine fruit

• Main Authors: S. Hassarangsee, S. Chantara, K. Whangchai, J. Uthaibutra
• Format: Book Series
• Published: 2018
• Subjects: Agricultural and Biological Sciences
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84940118566&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/44613
• Institution: Chiang Mai University

The reduction of Ethion, a frequently used pesticide in tangerine production was carried out by titanium dioxide (TiO < inf > 2 < /inf > ) photocatalysis with different concentrations (5, 10, 20, 40 and 60 mg ml < inf > -1 < /inf > ) and exposure times (0, 15, 30, 45 and 60 min) under a UV lamp. To evaluate the oxidation potential by TiO < inf > 2 < /inf > photocatalysis effects, iodine liberation from the reaction was measured. Iodine yield, which increased with increasing concentration and reaction time, was highest at 60 mg ml < inf > -1 < /inf > of TiO < inf > 2 < /inf > and longest at 60-min exposure time. TiO < inf > 2 < /inf > photocatalysis at the highest concentration was the most effective (60%) at reducing Ethion concentration with the highest rate of degradation occurring within the first 15 min (60%). When treated for alonger exposure time, the reduction of Ethion became insignificant.