Towards efficient photocatalytic degradation of organic pollutants in hierarchical TiO2/SnO p-n heterojunction under visible-light irradiation

Rui Zhang, Qi Wang, Jun Zhang, Qipeng Lu, Wenxiu Liu, Shu Yin, Wenbin Cao

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    Preparation of a p-n heterojunction with hierarchical structure is of great significance for photocatalysis due to its large specific surface area, abundant active sites and increased charge separation rate. Herein, we designed the novel p-n heterojunction photocatalyst TiO2/SnO microflower (TiO2/F-SnO) with hierarchical architecture by decorating TiO2 nanoparticles on the surface of the SnO microflower via a simple hydrothermal route. Compared to pure TiO2 and TiO2/SnO with a microplate structure (TiO2/P-SnO), TiO2/F-SnO heterojunctions exhibited significantly enhanced photocatalytic performances for organics removal such as toluidine blue O (TBO) and methylene blue (MB) under daylight fluorescent lamp irradiation (350-800 nm). The improved performance was not only ascribed to the promoted charge transfer and separation efficiency induced by the formation of p-n junction, but also attributed to the larger specific surface area, sufficient active sites and stronger redox ability provided by the hierarchical microflowers. Moreover, after three photocatalytic cycles (24 h), the TiO2/SnO heterojunction still exhibited a stable photocatalytic activity. Finally, the photocatalytic enhancement mechanism for the TiO2/SnO heterojunction was proposed based on band alignments calculation and the active species trapping experiments.

    Original languageEnglish
    Article number434001
    JournalNanotechnology
    Volume30
    Issue number43
    DOIs
    Publication statusPublished - 2019 Aug 12

    Keywords

    • hierarchical structure
    • interface engineering
    • p-n heterojunction
    • photocatalyst
    • photocatalytic degradation

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering
    • Electrical and Electronic Engineering

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