title: Sonocatalytic degradation of methyl parathion in the presence of nanometer and ordinary anatase titanium dioxide catalysts and comparison of their sonocatalytic abilities.
abstract: The degradation of methyl parathion (O,O-dimethyl-O-(4-nitrophenyl)-phosphorothioate) using anatase titanium dioxide (TiO(2)) powder as heterogeneous sonocatalysts is reported. The influences of reaction parameters such as the species of TiO(2) sonocatalysts, methyl parathion concentrations, TiO(2) adding amount, pH, ultrasonic intensity, ultrasonic frequency and temperature have been investigated and the optimal conditions for eliminating methyl parathion have been identified. The efficiencies of sonocatalytic degradation in both nanometer and ordinary anatase systems are compared and the results indicate that the sonocatalytic activity of nanometer anatase TiO(2) powder is better than that of ordinary anatase TiO(2) powder. The primary degradation and the total mineralization of methyl parathion have been monitored by high performance liquid chromatography (HPLC) and UV-vis spectra, respectively. Methyl parathion got destroyed to some extent in both nanometer and ordinary anatase systems under ultrasonic irradiation. The kinetics for the degradation process of methyl parathion follows the first-order reaction. The degradation ratio of methyl parathion surpassed 90% within 50min in the optimal experiment conditions.
authors.affiliation: Department of Chemistry, Liaoning University, Shenyang, PR China. wangjun890@126.com
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Pan
authors.forename: Zhaohong
authors.initials: Z
authors.lastname: Zhang
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Zhang
authors.forename: Fuyu
authors.initials: F
authors.lastname: Wen
authors.forename: Teng
authors.initials: T
authors.lastname: Ma
authors.forename: Yuefeng
authors.initials: Y
authors.lastname: Jiang
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Liang
authors.initials: L
authors.lastname: Xu
authors.forename: Pingli
authors.initials: P
authors.lastname: Kang
mesh_terms: D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D004305:Dose-Response Relationship, Drug; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008743:Methyl Parathion / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D008956:Models, Chemical; D036103:Nanotechnology / Q000379:methods; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014465:Ultrasonics; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical
chemical_list: D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D008743:Methyl Parathion; D014025:Titanium