title: Spectroscopic analyses on ROS generation catalyzed by TiO2, CeO2/TiO2 and Fe2O3/TiO2 under ultrasonic and visible-light irradiation.
abstract: In this work, the TiO2, CeO2/TiO2 and Fe2O3/TiO2 powders were irradiated, respectively, by ultrasound and visible-light, and the generation of reactive oxygen species (ROS) were estimated by the method of Oxidation-Extraction Photometry (OEP). That is, the 1,5-diphenyl carbazide (DPCI) can be oxidized by generated ROS into 1,5-diphenyl carbazone (DPCO), which can be extracted by mixed solvent of benzene and carbon tetrachloride. The DPCO extract liquor displays an obvious absorbance at 563 nm wavelength. In addition, some influencing factors, such as (ultrasonic or visible-light) irradiation time, catalyst addition amount and DPCI concentration, on the generation of ROS were also reviewed. The results indicated that the quantities of generated ROS increase with the increase of (ultrasonic or visible-light) irradiation time and catalyst addition amount. Moreover, the displayed quantities of ROS are also related with DPCI concentration. And then, several radical scavengers were used to determine the kinds of the generated ROS. At last, the researches on the sonocatalytic and photocatalytic degradation of several organic dyes have also been performed. It is wished that this paper might offer some important subjects for broadening the applications of sonocatalytic and photocatalytic technologies in future environment treatment.
authors.affiliation: College of Chemistry, Liaoning University, Shenyang 110036, PR China.
authors.forename: Mingming
authors.initials: M
authors.lastname: Zou
authors.forename: Yumei
authors.initials: Y
authors.lastname: Kong
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.forename: Zhiqiu
authors.initials: Z
authors.lastname: Wang
authors.forename: Baoxin
authors.initials: B
authors.lastname: Wang
authors.forename: Ping
authors.initials: P
authors.lastname: Fan
mesh_terms: D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D004160:Diphenylcarbazide / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D008027:Light; D010084:Oxidation-Reduction; D010783:Photometry / Q000379:methods; D017382:Reactive Oxygen Species / Q000032:analysis*; D013016:Sound; D014025:Titanium / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D017382:Reactive Oxygen Species; C009495:titanium dioxide; C000499:ferric oxide; D004160:Diphenylcarbazide; D002563:Cerium; C030583:ceric oxide; D014025:Titanium