In situ H+-mediated formation of singlet oxygen from NaBiO3 for oxidative degradation of bisphenol A without light irradiation: Efficiency, kinetics, and mechanism. (December 2015)

• Record Type: Journal Article
• Authors: Ding, Yaobin; Xia, Xiangli; Ruan, Yufeng; Tang, Heqing
• Is Part Of: Chemosphere. Volume 141(2015)
• Page Start: 80
• Page End: 86
• Publication Date: 2015-12
• Subjects: Sodium bismuthate -- Inorganic acid -- Singlet oxygen -- Bisphenol A -- Degradation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2015.06.048
• Languages: English
• ISSNs: 0045-6535

Abstract

Graphical abstract: Highlights: A new efficient singlet oxygen generation system was developed for degrading organic pollutants. Bisphenol A could be degraded efficiently by NaBiO3 in acidic solution. The degradation rate constant of bisphenol A was dependent on pH and NaBiO3 load. Singlet oxygen was produced from the crystal decomposition of NaBiO3 in acidic solution. 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 (1 g L −1 ) could eliminate almost all (more than 97%) of the added BPA (0.1 mmol L −1 ) in solutions at pH 5.0 in 60 min. 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 2 g L −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.