Synthesis, characterization, optoelectronic and photocatalytic properties of Sr2Bi2O5/SrCO3 and Sr3Bi2O6/SrCO3 heterostructures with varying SrCO3 content. (March 2021)

• Record Type: Journal Article
• Authors: Shtarev, Dmitry S.; Shtareva, Anna V.; Kevorkyants, Ruslan; Syuy, Alexander V.
• Is Part Of: Chemosphere. Volume 267(2021)
• Publication Date: 2021-03
• Subjects: Visible light photocatalysts -- Heterostructures -- Luminescence -- DFT calculations; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.129229
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: We report on the structure and properties of novel Sr2 Bi2 O5 /SrCO3 and Sr3 Bi2 O6 /SrCO3 heterostructures with SrCO3 content varying from 10 wt% to 90 wt%. Formation of the heterostructures is succeeded via sintering technique and according to XRD, SEM, and EDX studies has resulted in highly crystalline materials with well-defined carbonate-bismuthate interfaces. In the reaction of photodegradation of phenol in aqueous solution the heterostructures demonstrated photocatalytic activity exceeding that of TiO2 . It is demonstrated that their photocatalytic action is due to the presence of type II semiconductor heterojunctions. The content of SrCO3 ensuring utmost photocatalytic activity is explained based on numerical modeling of the heterostructures' formation using 'Unity' development platform. In addition, the heterostructures show photoluminescence. Its mechanism proposed here implies permeability of the materials' heterojunctions to electrons. This work describes new materials that can be used for photodegradation of organic pollutants. Besides, it extends available principles of design of photocatalytically active heterostructures.