Insight into the Photocatalytic Removal of NO in Air over Nanocrystalline Bi2Sn2O7under Simulated Solar Light

Yanfeng Lu, Yu Huang, Jun Ji Cao, Wingkei Ho, Qian Zhang, Dandan Zhu, Shuncheng Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)

Abstract

Understanding the photocatalytic conversion mechanism of NO is crucial to develop an effective and practical strategy for indoor air pollution control. In this study, we systematically investigated the photocatalytic removal mechanism of NO over nanocrystalline Bi2Sn2O7, which was successfully synthesized via hydrothermal method using bismuth citrate and stannic chloride pentahydrate as precursors for the first time. Various characterizations were carried out to study the physicochemical properties of the as-prepared samples. The performance of the as-prepared Bi2Sn2O7samples was evaluated by the photocatalytic degradation of NO in a continuous reactor under simulated solar light irradiation. The NO removal rate over the Bi2Sn2O7sample synthesized for 12 h (BSO-12) was 37%, which was much higher than those of Bi2Sn2O7samples synthesized for 24 h (BSO-24) and 36 h (BSO-36). Results from photocurrent tests and electrochemical impedance spectroscopy (EIS) demonstrated that the BSO-12 sample presents much more effective interface charge separation efficiency, which can contribute to its improved photocatalytic performance. Reactive radicals during the photocatalysis processes were identified via trapping experiments, which were also confirmed by electron spin resonance (ESR) study. Combined with the quantification of reaction intermediates, the photocatalytic removal mechanism of NO over nanocrystalline Bi2Sn2O7was proposed for the first time.
Original languageEnglish
Article number6b02514
Pages (from-to)10609-10617
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume55
Issue number40
DOIs
Publication statusPublished - 12 Oct 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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