title: In situ H(+)-mediated formation of singlet oxygen from NaBiO3 for oxidative degradation of bisphenol A without light irradiation: Efficiency, kinetics, and mechanism.
abstract: Bisphenol A (BPA) is a ubiquitous environmental contaminant with endocrine disruption potential. This study explored the efficiency, kinetics, and mechanism of BPA removal from weakly acidic solutions by using NaBiO3 as a source of singlet oxygen. It was observed that the use of NaBiO3 (1gL(-1)) could eliminate almost all (more than 97%) of the added BPA (0.1mmolL(-1)) in solutions at pH 5.0 in 60min. The degradation of BPA followed pseudo-first-order kinetics over the pH range from 3 to 9, and the pseudo-first-order rate constant (k) was dependent on pH, NaBiO3 concentration and the coexisting compounds. As solution pH was decreased from 9 to 3 or NaBiO3 concentration was increased from 0.5 to 2gL(-1), the k value was increased logarithmically. Humic acid and Fe(3+) showed little effect on the BPA removal, but Mn(2+) exhibited exceptionally enhancing effect on the degradation of BPA. The involved reactive species were identified as singlet oxygen by using radical scavenger probes and ESR measurement, and the generated singlet oxygen was confirmed to be generated from the decomposition of NaBiO3 mediated by H(+) ions.
authors.affiliation: Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, PR China.
authors.forename: Yaobin
authors.initials: Y
authors.lastname: Ding
authors.affiliation: Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, PR China.
authors.forename: Xiangli
authors.initials: X
authors.lastname: Xia
authors.affiliation: Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, PR China.
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Ruan
authors.affiliation: Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, PR China. Electronic address: hqtang62@aliyun.com.
authors.forename: Heqing
authors.initials: H
authors.lastname: Tang
mesh_terms: D001559:Benzhydryl Compounds / Q000032:analysis* / Q000737:chemistry; D001729:Bismuth / Q000737:chemistry*; D052244:Endocrine Disruptors / Q000032:analysis* / Q000737:chemistry; D006812:Humic Substances / Q000032:analysis; D007700:Kinetics; D008027:Light; D017895:Manganese Compounds / Q000737:chemistry; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis* / Q000737:chemistry; D026082:Singlet Oxygen / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D012996:Solutions; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D001729:Bismuth; D052244:Endocrine Disruptors; D006812:Humic Substances; D017895:Manganese Compounds; D010636:Phenols; D026082:Singlet Oxygen; D012964:Sodium; D012996:Solutions; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: Bisphenol A; Degradation; Inorganic acid; Singlet oxygen; Sodium bismuthate