title: Determination of hydroxyl radicals in TiO2/Ti photoelectrocatalytic oxidation system using Fe(phen)3(2+) spectrophotometry.
abstract: A new method of determining the cumulate concentration of hydroxyl radicals in the TiO2/Ti photoelectrocatalytic (PEC) oxidation system was established by o-phenanthroline-Fe(II)(Fe(phen)3(2+)) spectrophotometry and using anion exchange membrane. Fe (phen)3(2+) can be oxidized to o-phenanthroline-Fe(III)(Fe(phen)3(3+)) by strong oxidization of hydroxyl radicals(*OH). Then the cumulate concentration of hydroxyl radicals can be calculated through determining the change of the Fe(phen)3(3+) absorbency at 509 nm. In addition, the research results showed the production rate of hydroxyl radicals was affected obviously by pH of solution, the cumulate concentration of hydroxyl radicals was the largest at nearby the initial pH 6.3 (isoelectric point), and the change direction of pH after illumination tended to nearby isoelectric point.
authors.affiliation: Department of Environmental Engineering, Harbin Institute of Technology, Harbin 150001, China.
authors.forename: Yan-Li
authors.initials: YL
authors.lastname: Jiang
authors.forename: Hui-Ling
authors.initials: HL
authors.lastname: Liu
authors.forename: Qun-Hui
authors.initials: QH
authors.lastname: Wang
authors.forename: Zhao-Hua
authors.initials: ZH
authors.lastname: Jiang
mesh_terms: D002384:Catalysis; D004563:Electrochemistry; D005296:Ferrous Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017665:Hydroxyl Radical / Q000032:analysis*; D010084:Oxidation-Reduction; D010618:Phenanthrolines / Q000737:chemistry*; D010777:Photochemistry; D013057:Spectrum Analysis / Q000379:methods*; D014025:Titanium / Q000737:chemistry*
chemical_list: D005296:Ferrous Compounds; D010618:Phenanthrolines; C009495:titanium dioxide; D017665:Hydroxyl Radical; D014025:Titanium; C025205:1,10-phenanthroline