title: Photocatalytic degradation of 3,4-dichlorophenylurea in aqueous gold nanoparticles-modified titanium dioxide suspension under simulated solar light.
abstract: The TiO(2) modified with nanosized gold particles was prepared by deposition-precipitation at pH 7 and calcination in air at various temperatures up to 973 K. The materials were characterized by transmission electron microscope, X-ray diffraction spectrometry, and atomic absorption spectroscopy. The highest photocatalytic efficiency was obtained at the calcination temperature of 873 K. The decrease in 3,4-dichlorophenylurea concentration follows first order kinetics with a half life of 36.6 ± 2.0 min in 100 mg L(-1) of 0.83 wt% Au/TiO(2). Fifteen degradation products were identified using LC/MS/MS and IC. Degradation pathway was proposed on the basis of the observed transformation products.
authors.affiliation: Chemistry Department and Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.
authors.forename: S
authors.initials: S
authors.lastname: Chusaksri
authors.forename: J
authors.initials: J
authors.lastname: Lomda
authors.forename: T
authors.initials: T
authors.lastname: Saleepochn
authors.forename: P
authors.initials: P
authors.lastname: Sutthivaiyakit
mesh_terms: D002384:Catalysis; D006046:Gold; D006207:Half-Life; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D010671:Phenylurea Compounds / Q000737:chemistry* / Q000528:radiation effects; D010782:Photolysis / Q000187:drug effects / Q000528:radiation effects; D013472:Sunlight; D013535:Suspensions; D053719:Tandem Mass Spectrometry; D014025:Titanium / Q000737:chemistry*
chemical_list: C561340:3,4-dichlorophenylurea; D010671:Phenylurea Compounds; D013535:Suspensions; C009495:titanium dioxide; D006046:Gold; D014025:Titanium