title: [Spectrum study of organochlorine pesticides after nano TiO2 photocatalytic degradation in AgNO3 medium].
abstract: A study on a nano anatase TiO2 production from the hydrolysis of TiCl4 was presented. In the nano TiO2 suspending medium, the photocatalytic behaviors for some organochlorine pesticides including alpha, beta, gamma, delta-BHC, DDT, dieldrin, dicofol and agroceres were compared and studied under UV irradiation in the air. Owing to structural difference of C--Cl in the molecule, the degradation efficiencies for the organochlorine pesticides presented an obvious difference with the order of dicofol>dieldrin> DDT>agroceres and alpha-BHC>gamma-BHC>delta-BHC>beta-BHC. Accordingly, the nano TiO2 material was applied as a photocatalyzer, which catalyzed transformation of organochlorine pesticide to chlorine ion. Nanoparticle of silver chloride with a maximal absorbance at the wavelength of 260 nm were prepared in the surfactant polyvinyl alcohol solution. Organochlorine pesticides could be determined according to the concentration of silver chloride.
authors.affiliation: Key Laboratory of Analysis and Detection Technology for Food Safety, Fuzhou University, China.
authors.forename: Mei-jin
authors.initials: MJ
authors.lastname: Li
authors.forename: Bin
authors.initials: B
authors.lastname: Qiu
authors.forename: Guang-mei
authors.initials: GM
authors.lastname: Guo
authors.forename: Mei-hua
authors.initials: MH
authors.lastname: Liu
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
mesh_terms: D002384:Catalysis; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry*; D049329:Nanostructures; D010575:Pesticides / Q000737:chemistry*; D010777:Photochemistry; D012835:Silver Nitrate; D014025:Titanium
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; C009495:titanium dioxide; D012835:Silver Nitrate; D014025:Titanium