Electron beam irradiation treatment of Ag/Bi2WO6/CdWO4 heterogeneous material with enhanced photocatalytic activity. (7th August 2019)

• Record Type: Journal Article
• Authors: Sun, Renrui; Wang, Jing; Yang, Tianli; He, Ren; Xue, Kehui; Wang, Lin; Yu, Xianglin; Wang, Juntao; Yang, Ting; Wang, Wenlei
• Is Part Of: New journal of chemistry. Volume 43:Number 35(2019)
• Page Start: 13764
• Page End: 13774
• Publication Date: 2019-08-07
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c9nj02571e
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Ag/Bi2 WO6 /CdWO4 ternary heterostructure materials treated by electron beam irradiation are used for the highly efficient degradation of inorganic and organic pollutants. Abstract : An efficient ternary heterostructure material Ag/Bi2 WO6 /CdWO4 was prepared via a facile hydrothermal route. The in situ loading precisely regulated the distribution of silver nanoparticles on the heterojunction surface. Besides, electron beam irradiation was used for artificially creating interface defects in the material, so the specific surface area of the material was increased. The introduction of defects was conducive for the migration of catalytically active substances towards the surface of the material. Under visible light irradiation, the degradation efficiency of the heterostructure material was improved significantly. Within 20 min, the removal efficiency of the treated material for carmine could reach about 100% (50 mL, 50 mg L −1 ), while that for hexavalent chromium (Cr 6+ ), it could reach about 100% (50 mL, 10 mg L −1 ) within 90 min. In addition, the results showed that 4% Ag load rate had the best improvement on the photocatalytic performance of the ternary heterostructure material, irrespective of the degradation process of carmine, Cr 6+ or rhodamine B (RhB). Optimum amount of supported in situ nano-silver induced resonance of the plasma on the catalytic interface and synergized with Bi 3+ to improve the catalytic efficiency. PL, DRS and XPS results proved that the ternary heterostructure could effectively inhibit the rapid recombination of electron hole pairs of Ag/Bi2 WO6 /CdWO4 . As for the role of electron beam irradiation, it could improve the content of free hydroxyl groups on the material surface and enhance the catalytic capacity of the Ag/Bi2 WO6 /CdWO4 heterogeneous material. A feasible reaction pathway and photocatalytic mechanism for the degradation of carmine was investigated by gas chromatography-tandem mass spectrometry (GC-MS), and the main role of ˙OH in the catalytic process was obtained by using different scavengers.