title: Investigation on the sonocatalytic degradation of acid red B in the presence of nanometer TiO2 catalysts and comparison of catalytic activities of anatase and rutile TiO2 powders.
abstract: Here, the nanometer anatase and rutile titanium dioxide (TiO(2)) powders were introduced to act as the sonocatalysts during the ultrasonic degradation of azo dye-acid red B which was chosen as model compound. The ultrasound of low power was used as an irradiation source to induce TiO(2) particles performing catalytic activity. It was found that the processes of sonocatalytic degradation were different between nanometer anatase TiO(2) and nanometer rutile TiO(2). For nanometer anatase TiO(2) catalyst, the acid red B was mainly oxidated by the holes on the surface of nanometer anatase TiO(2) particles, so that the decolorization and degradation happened at the same time. For the nanometer rutile TiO(2) catalyst, the acid red B was mainly oxidated by the *OH radicals from the ultrasonic cavitation, so that the decolorization of azo bond takes place primarily, and then the degradation of naphthyl ring does. The intermediates of acid red B in the presence of nanometer anatase and rutile TiO(2) powders have been monitored by UV-vis spectra and high performance liquid chromatography (HPLC), respectively. All experiments indicated that the degradation effect of acid red B in the presence of nanometer anatase TiO(2) powder was obviously better than that in the presence of nanometer rutile TiO(2) powder. Hence, the method of sonocatalytic degradation for organic pollutants in the presence of nanometer anatase TiO(2) powder is expected to be promising as an advisable choice for the treatment of organic wastewaters in future.
authors.affiliation: Department of Chemistry, Liaoning University, Shenyang 110036, PR China. Electronic address: wangjun890@126.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Liaoning University, Shenyang 110036, PR China.
authors.forename: Yuefeng
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: Department of Environment Science, Liaoning University, Shenyang 110036, PR China.
authors.forename: Zhaohong
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Liaoning University, Shenyang 110036, PR China.
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Liaoning University, Shenyang 110036, PR China.
authors.forename: Teng
authors.initials: T
authors.lastname: Ma
authors.affiliation: Department of Chemistry, Liaoning University, Shenyang 110036, PR China.
authors.forename: Guan
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Liaoning University, Shenyang 110036, PR China.
authors.forename: Gang
authors.initials: G
authors.lastname: Zhao
authors.affiliation: Department of Chemistry, Liaoning University, Shenyang 110036, PR China.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Liaoning University, Shenyang 110036, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Li
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000737:chemistry*; D011208:Powders; D013783:Textile Industry; D014025:Titanium / Q000737:chemistry*; D014465:Ultrasonics; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D009282:Naphthalenesulfonates; D011208:Powders; D014874:Water Pollutants, Chemical; C521611:acid red B; C009495:titanium dioxide; D014025:Titanium