Highly efficient photocatalytic degradation over rose-like 1D/2D La(OH)3/(BiO)2OHCl heterostructures boosted by rich oxygen vacancies and enhanced interfacial charge transfer. Issue 1 (19th December 2022)

• Record Type: Journal Article
• Authors: Tan, Ying; Zhou, Qin; Huang, Weiya; Lu, Kangqiang; Yang, Kai; Chen, Xunjun; Li, Dan; Dionysiou, Dionysios D.
• Is Part Of: Environmental science. Volume 10:Issue 1(2023)
• Page Start: 215
• Page End: 228
• Publication Date: 2022-12-19
• Subjects: Environmental sciences -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2en00792d
• Languages: English
• ISSNs: 2051-8153

Abstract

Abstract : Novel rose-like photocatalysts were constructed by 1D/2D La(OH)3 /(BiO)2 OHCl heterojunctions. The highly efficient photocatalytic degradation was boosted by the combined effects of rich oxygen vacancies and enhanced interfacial charge transfer. Abstract : In this work, novel rose-like photocatalysts were successfully fabricated by constructing 1D/2D La(OH)3 nanorod/(BiO)2 OHCl nanosheet heterojunctions. The optimal sample, BOL-2, synthesized with a Bi/La molar ratio of 4 : 1 showed significantly boosted visible-light-induced photocatalytic activity. Its kinetic rate constant ( k ) in the photocatalytic degradation of tetracycline (TC) and o -nitrophenol was 3.5 and 6.4 times that of (BiO)2 OHCl. The existence of rich surface oxygen vacancies (OVs) and 1D/2D heterojunctions together contributes to enhanced photocatalytic performance. The OVs broadened the light absorption range and enhanced visible light absorbance, while the formation of the La(OH)3 /(BiO)2 OHCl heterojunction by close 1D/2D interface contact improved the charge separation and transfer efficiency of BOL-2. The free radical scavenging tests and DMPO spin-trapping technology further affirmed that more ˙O2 − and ˙OH as active species were generated in the presence of BOL-2 than in the presence of (BiO)2 OHCl, thereby leading to remarkably improved photocatalytic performance. BOL-2 also exhibited excellent stability in photocatalytic degradation, and the degradation efficiency only declined by 2.5% in the fourth cycle. Possible photocatalytic mechanisms as well as degradation pathways of TC over BOL-2 were explored. This work will provide new insights into the rational design of efficient photocatalysts by 1D/2D heterojunction construction and OV engineering for wastewater remediation.