On the assessment of photocatalytic activity and charge carrier mechanism of TiO2@SnO2 core-shell nanoparticles for water decontamination

A. Farhadi, M. R. Mohammadi (Lead / Corresponding author), M. Ghorbani

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    We synthesize TiO2@SnO2 core-shell nanoparticles (NPs) by a facile two-step aqueous sol-gel method and their photocatalytic activity is compared with the pure TiO2 and SnO2 NPs for degradation of methylene blue under UV irradiation. The chemical property, crystal structure and morphology of the synthesized samples are studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FE-SEM) and transmission electron microscope (TEM) techniques. The mechanisms of electron–hole recombination and separation of charge carriers are studied by photoluminescence (PL) and diffuse reflectance spectroscopy (DRS). Furthermore, the kinetics study of photocatalytic degradation of dye methylene blue is carried out based on Langmuir-Hinshelwood model. The remarkable enhancement in photocatalytic activity of the core-shell nanoparticle compared to its constituents is attributed to the lower recombination rate of charge carriers in the core-shell heterostructure.

    Original languageEnglish
    Pages (from-to)171-177
    Number of pages7
    JournalJournal of Photochemistry and Photobiology A: Chemistry
    Volume338
    Early online date14 Feb 2017
    DOIs
    Publication statusPublished - 1 Apr 2017

    Keywords

    • Electron–hole recombination
    • Kinetics study
    • Photocatalytic activity
    • Separation of charge carriers
    • TiO@SnO core-shell nanoparticles

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