Journal
ENVIRONMENTAL RESEARCH
Volume 197, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2021.111143
Keywords
AgI; Sb2O3; Heterojunction photocatalyst; Visible light; Degradation
Funding
- National Natural Science Foundation of China [51472194]
- NSF of Hubei Province [2016CFA078]
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The study synthesized AgI/Sb2O3 heterojunction photocatalysts through a simple method, which exhibited excellent degradation performance under visible light, mainly due to the effective transfer of e(-) from AgI to Sb2O3 promoting the separation of photo-induced carries. Moreover, the electron transfer from AgI to Sb2O3 also contributed to the improvement of stability.
The construction of heterojunction is considered as a promising approach to designing highly effective visiblelight driven photocatalysts. In this research, the AgI/Sb2O3 heterojunction photocatalyst was synthesized by a simple in situ deposition-precipitation procedure, which was supported by XPS results. Among the prepared samples, the 60% AgI/Sb2O3 samples exhibited the best ARG degradation ratio (98.3%) in 1 h under visible light irradiation, while the pure Sb2O3 and AgI exhibited almost none photocatalytic performance. The trapping experiments and EPR proved that the photo-generated center dot O-2(-) and center dot OH made major contributions to the photocatalytic degradation of ARG by the 60% AgI/Sb2O3 samples. The enhanced photocatalytic performance of AgI/Sb2O3 heterojunction photocatalysts was ascribed to that the e(-) produced in the CB of AgI would be transferred to the empty CB of Sb2O3, which could effectively promote separation of photo-induced carries. More importantly, the transfer of electrons from AgI to Sb2O3 would be in favor of restraining the reduction of Ag+ to Ag0 resulting in the good stability of heterojunction photocatalysts. The heterojunction photocatalyst provided in this work might be a prospective candidate for decontamination of water.
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