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Issue 15, 2012
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Rapid synthesis of Zn2+ doped SnWO4 nanowires with the aim of exploring doping effects on highly enhanced visible photocatalytic activities

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Abstract

In this work, we report on the rapid synthesis of Sn1−xZnxWO4 nanocrystals with the aim of tailoring their structural, electronic, and photocatalytic properties. The samples were carefully characterized by X-ray diffraction, transmission electron microscopy, inductive coupled plasma optical emission spectroscopy, UV-vis diffuse reflectance spectroscopy, and the Barrett–Emmett–Teller technique. The effects of Zn2+ doping in SnWO4 on the electronic structure and photogradation of methylene orange dye solution were investigated experimentally and theoretically. It was found that Zn2+ ions were homogeneously incorporated into the SnWO4 host lattice with a solubility of x = 0.060, which led to a monotonous decrease in lattice volume. With Zn2+ doping, SnWO4 nanocrystals showed a morphological alteration from irregular nanosheets to nanowires. Meanwhile, the BET surface areas were also greatly enlarged from 54 m2 g−1 to ∼100 m2 g−1. Contrary to the theoretical predictions of the quantum size effect, Zn2+ doped SnWO4 nanocrystals showed an abnormal band gap narrowing, which can be well-defined as a consequence of the balance of quantum size effect, lattice contraction, electronegativity, and surface defect centers. With well-controlled morphology, surface area, and electronic structure via Zn2+ doping, the photocatalytic performance of Sn1−xZnxWO4 nanocrystals was optimized at a Zn2+ doping level of x = 0.045.

Graphical abstract: Rapid synthesis of Zn2+ doped SnWO4 nanowires with the aim of exploring doping effects on highly enhanced visible photocatalytic activities

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Publication details

The article was received on 05 Mar 2012, accepted on 06 May 2012 and first published on 08 May 2012


Article type: Paper
DOI: 10.1039/C2RA20401K
Citation: RSC Adv., 2012,2, 6266-6273
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    Rapid synthesis of Zn2+ doped SnWO4 nanowires with the aim of exploring doping effects on highly enhanced visible photocatalytic activities

    Y. Su, L. Hou, C. Du, L. Peng, K. Guan and X. Wang, RSC Adv., 2012, 2, 6266
    DOI: 10.1039/C2RA20401K

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