title: H₃PW₁₂O₄₀/TiO₂ catalyst-induced photodegradation of bisphenol A (BPA): kinetics, toxicity and degradation pathways.
abstract: A series of experiments were conducted to investigate the kinetics of bisphenol A (2,2-bis(4-hydroxyphenyl)propane, BPA) degradation using H₃PW₁₂O₄₀/TiO₂ (PW₁₂/TiO₂) composite catalyst, toxicity of BPA intermediate products and degradation pathways. The results showed that the BPA photodegradation using PW₁₂/TiO₂ catalyst followed the first-order kinetics, and under the optimal experimental conditions at H₃PW₁₂O₄₀ loading amount of 6.3%, BPA initial concentration of 5 mg L(-1), and the solution pH of 8.2, the kinetic constant was 3.7-fold larger than that of pristine TiO₂. The hydroxyl radicals derived from the electroreduction of dissolved oxygen with electrons via chain reactions was the main reactive oxygen species. According to the identified intermediates, 4-isopropanolphenol, hydroquinone, 4-hydroxybenzoic acid, and phenol, the possible BPA photodegradation pathways were proposed. Upon 12h irradiation, 77% BPA (20 mg L(-1)) was mineralized and the toxicity to Daphnia magna (D. magna) was almost disappeared, implying the strong oxidation ability of PW₁₂/TiO₂ catalyst. The studies provide important information about the BPA degradation and promote the technical development for BPA removal.
authors.affiliation: School of Urban and Environmental Sciences, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Nan
authors.initials: N
authors.lastname: Lu
authors.forename: Ying
authors.initials: Y
authors.lastname: Lu
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Liu
authors.forename: Kun
authors.initials: K
authors.lastname: Zhao
authors.forename: Xing
authors.initials: X
authors.lastname: Yuan
authors.forename: Yahui
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
authors.forename: Hongwei
authors.initials: H
authors.lastname: Qin
authors.forename: Jia
authors.initials: J
authors.lastname: Zhu
mesh_terms: D000818:Animals; D001559:Benzhydryl Compounds / Q000737:chemistry* / Q000633:toxicity; D002384:Catalysis; D003621:Daphnia / Q000187:drug effects; D052918:Environmental Restoration and Remediation; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry* / Q000633:toxicity; D010782:Photolysis; D013472:Sunlight; D014025:Titanium / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D010636:Phenols; D014025:Titanium; D017973:Tungsten Compounds; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C006780:bisphenol A; D000098826:Bisphenol A Compounds