Tuning the catalytic performance of CaSnO3 by developing an S-scheme p-n heterojunction through Ag6Si2O7 doping

Navid Hussain Shah, Muhammad Abbas, Muhammad Qasim, Muhammad Sulman, Muhammad Imran, Sohail Azmat, Yanyan Cui*, Yaling Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Perovskites, especially alkaline earth stannates, have drawn enormous interest from the research community owing to their low chemical toxicity, environmental friendliness, excellent optical properties, and good thermal and chemical stabilities. However, poor conductivity, intense carrier recombination, and low absorption in the visible range prevent them from being practical. Herein, we took calcium tin oxide (CaSnO3) as the target material and improved its photocatalytic performance by introducing different ratios of silver silicate (Ag6Si2O7). The constitution of the heterostructure in CaSnO3/Ag6Si2O7 not only improved the separation of carriers but also promoted the absorption in the visible region owing to a reduction in the optical bandgap. The presence of Ag6Si2O7 in the composite catalyst improved the conductivity and thereby helped carriers carry most of the energy to the surface of the catalyst. When the Ag6Si2O7/CaSnO3-H catalyst was tested against RhB degradation, it achieved a degradation efficiency of 95.24% in 60 minutes whilst showing a degradation rate constant of 0.04971 min−1 which is 24.48 times greater than its counterparts. The quenching experiments showed that holes and OH radicals play a crucial role during the degradation process. The employed catalyst retained excellent recycling ability up to four cycles suggesting its excellent practicality in the field of catalysts. The facile and environmentally sustainable approach used for synthesizing Ag6Si2O7/CaSnO3 hybrids could be of great importance in the field of visible-light-driven catalysts and their subsequent applications.

Original languageEnglish
Pages (from-to)6490-6504
Number of pages15
JournalCatalysis Science and Technology
Volume13
Issue number22
DOIs
Publication statusPublished - 3 Oct 2023

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