Enhanced degradation of amiloride over Bi2FeNbO7/bisulfite process: Key factors and mechanism. (August 2022)

• Record Type: Journal Article
• Authors: Zhao, Jie; Wu, Fei; He, Qiang; Feng, Yawei
• Is Part Of: Chemosphere. Volume 300(2022)
• Publication Date: 2022-08
• Subjects: Bi2FeNbO7 -- Hydrothermal -- Bisulfite activation -- Amiloride -- Degradation mechanism; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.134573
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Construction of Bi2 FeNbO7 /bisulfite system for abatement of pharmaceutical residue was achieved. An attempt to synthesize Bi2 FeNbO7 through hydrothermal technique was confirmed by X-ray diffraction. The magnetic field experiment revealed that Bi2 FeNbO7 possessed a saturation magnetization of 6.99 emu/g, indicating magnetic attributes of Bi2 FeNbO7 . Scanning electron microscopy images showed that Bi2 FeNbO7 exhibited regular octahedra in the size of 200–300 nm. In a self-made device, the activation of sodium bisulfite using Bi2 FeNbO7 for the disposal of amiloride has been carefully explored. The effects of solution pH, sodium bisulfite concentration, Bi2 FeNbO7 dosage, amiloride concentration, coexisting ions, and water matrix on the performance of Bi2 FeNbO7 /bisulfite system was investigated. The catalytic performance of Bi2 FeNbO7 /bisulfite to degrade amiloride was considerably higher than that of traditional iron oxides. The maximum removal efficiency of amiloride was 97.9% in Bi2 FeNbO7 /bisulfite process. The involvement of Fe might be crucial for activating bisulfite to create active species. The dominating radical in Bi2 FeNbO7 /bisulfite process was identified as SO3 ‒ . With the help of UHPLC/MS/MS, three new degradation products of amiloride were found. Dehalogenation and deamination of amiloride might account for the formation of these transformation products. This work provides a highly efficient Bi2 FeNbO7 /bisulfite process for the disposal of pharmaceutical pollutants in water treatment. Graphical abstract: Image 1 Highlights: The Bi2 FeNbO7 /bisulfite process exhibited high catalytic activities towards pharmaceutical residue. The mechanism of Bi2 FeNbO7 /bisulfite to produce SO3 . ‒ was investigated. The crucial role of Fe in Bi2 FeNbO7 /bisulfite process was confirmed. Dehalogenation and deamination of amiloride were involved in heterogeneous oxidation process.