Construction of a hydrangea-like Bi2WO6/BiOCl composite as a high-performance photocatalyst. (13th January 2022)

• Record Type: Journal Article
• Authors: Jiang, Haiyan; Li, Yang; Wang, Xu; Hong, Xiaodong
• Is Part Of: New journal of chemistry. Volume 46:Number 6(2022)
• Page Start: 2627
• Page End: 2634
• Publication Date: 2022-01-13
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d1nj05409k
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Bi2 WO6 flower-like microspheres were acted as porous templates for depositing BiOCl to prepare a hydrangea-like Bi2 WO6 /BiOCl composite. The Bi2 WO6 /BiOCl heterojunction exhibits a high photocatalytic activity under visible light. Abstract : The microstructure design and construction of a heterojunction are major strategies for enhancing the photocatalytic activity of semiconductors. Herein, Bi2 WO6 flower spheres were synthesized and acted as a porous template for depositing BiOCl to fabricate a Bi2 WO6 /BiOCl composite photocatalyst. Through changing the concentrations of the Bi 3+ and Cl − precursors, a hydrangea-like Bi2 WO6 /BiOCl composite with a porous nanostructure was synthesized. Rhodamine B (RhB), methylene blue (MB) and tetracycline hydrochloride (TCH) were selected as simulated pollutants for degradation by the photocatalyst. Under the irradiation of visible light, the optimized Bi2 WO6 /BiOCl composite removes almost 100% of RhB from solution in 60 min, 88% of MB in 75 min, and 90% of TCH in 90 min, much better than the performances of pure Bi2 WO6 or BiOCl. The excellent photocatalytic activity of the Bi2 WO6 /BiOCl composite can be attributed to its hydrangea-like nanostructure and Bi2 WO6 /BiOCl heterojunction. On the one hand, the hydrangea-like structure promotes the physical adsorption of organic molecules on the photocatalyst. On the other hand, the Bi2 WO6 /BiOCl heterojunction broadens the light absorption range, accelerates the separation of photogenerated electrons and holes, and decreases charge transfer resistance, further improving the photocatalytic activity of the material. ˙O2 − and ˙OH reactive species were generated under visible light irradiation, which promoted the fast degradation of organic pollutants. Based on the reactive species and the position of its conduction/valence band, the photocatalytic mechanism of the Bi2 WO6 /BiOCl composite was proposed as a Z-scheme heterojunction transfer mode.