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- Title
Visible-light-induced Photocatalytic Degradation of Herbicide Mecoprop in Aqueous Suspension of TiO<sub>2</sub>.
- Authors
Abramović, Biljana; Šojić, Daniela; Anderluh, Vesna
- Abstract
The visible-light-induced degradation reaction of RS-2-(4-chloro-o-tolyloxy)propionic acid (mecoprop) was investigated in aqueous suspension of TiO2 Degussa P25. Diffuse reflectance spectra showed that mecoprop adsorbed on TiO2 powder induced visible-light absorption (λ > 400 nm). Formation of charge-transfer complexes was confirmed by recording FTIR spectra. The efficiency of TiO2 as a photocatalyst with artificial visible light was compared to sunlight and UV light, as well as direct photolysis with visible-light, sunlight and UV light. The rate of mecoprop decomposition, in the presence of visible light, is 0.86 µmol dm-3 min-1, which is about four times higher in comparison to direct photolysis. The effect of catalyst loading was investigated as well, and it was found that even at 8 mg cm-3 TiO2 the efficiency of photocatalytic degradation increases, which is significantly higher than when UV radiation is used. This difference in the effect of catalyst loading is probably a consequence of a different photodegradation mechanism under visible and UV illumination, i.e. that surface complexation between mecoprop and TiO2 is a reasonable explanation for the visible light reactivity. Besides, the addition of 2-methyl-2-propanol, a common ֹOH radical scavenger, did not considerably affect the photocatalytic degradation of mecoprop under visible irradiation, which indicates that ֹOH radicals are not involved.
- Subjects
PHOTODEGRADATION; PHOTOCHEMISTRY; HERBICIDES; TITANIUM dioxide; SUSPENSIONS (Chemistry)
- Publication
Acta Chimica Slovenica, 2007, Vol 54, Issue 3, p558
- ISSN
1318-0207
- Publication type
Article