One-step synthesis of Bi2O2CO3/Bi2S3 S-scheme heterostructure with enhanced photoactivity towards dibutyl phthalate degradation under visible light. (May 2023)

• Record Type: Journal Article
• Authors: Liu, Kexue; Li, Na; Ding, Jia; Chen, Na; Wang, Suo; Wang, Qian; Yao, Xiangfeng; Li, Xianxu; Wang, Jun; Yin, Huanshun
• Is Part Of: Chemosphere. Volume 324(2023)
• Publication Date: 2023-05
• Subjects: Bi2O2CO3/Bi2S3 -- S-scheme heterostructure -- Photocatalysis -- Degradation -- Plasticizer -- Dibutyl phthalate -- Phthalic acid ester; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2023.138357
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Bi2 O2 CO3 /Bi2 S3 heterojunction was prepared by one-step hydrothermal method, where Bi(NO3 )3 was employed as Bi source, Na2 S was used as a sulfur source, and CO(NH2 )2 was adopted as C source. The load of Bi2 S3 was adjusted by changing the content of Na2 S. The prepared Bi2 O2 CO3 /Bi2 S3 illustrated strong photocatalytic activity towards dibutyl phthalate (DBP) degradation. The degradation rate was 73.6% under the irradiation of visible light for 3 h, which were 3.5 and 1.87 times for Bi2 O2 CO3 and Bi2 S3, respectively. In addition, the mechanism for the enhanced photoactivity was investigated. After combined with Bi2 S3, the formed heterojunction structure inhibited the recombination of photogenerated electron-hole pair, improved the visible light adsorption, and accelerated the migration rate of the photogenerated electron. As a result, analysis of the radical formation and the energy band structure revealed that Bi2 O2 CO3 /Bi2 S3 was consistent with the S-scheme heterojunction model. The S-scheme heterojunction allowed the Bi2 O2 CO3 /Bi2 S3 to possess high photocatalytic activity. The prepared photocatalyst presented acceptable cycle application stability. This work not only develops a facile one-step synthesis technique for Bi2 O2 CO3 /Bi2 S3, and also provides a good platform for the degradation of DBP. Graphical abstract: Image 1 Highlights: Bi2 S3 /Bi2 O2 CO3 was prepared with one-pot hydrothermal method firstly. The content of Bi2 S3 can be controlled by Na2 S. The photoactivity of Bi2 S3 /Bi2 O2 CO3 was improved under visible light. First application of catalyst Bi2 S3 /Bi2 O2 CO3 to the degradation of DBP. The remarkable photocatalytic performance is ascribed to the formation of S-scheme heterojunction.