Heterojunction construction between TiO2 hollowsphere and ZnIn2S4 flower for photocatalysis application

TiO2 hollow spheres (THSs) and ZnIn2S4 (ZIS) flowers were tightly combined to form a heterojunction system for photocatalytic metronidazole degradation. [Display omitted] •Heterojunction was built between TiO2 hollow spheres (THSs) and ZnIn2S4 (ZIS) flowers.•Size discrepancy of THS and ZIS spheres c...

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Bibliographic Details
Published in:Applied surface science 2017-03, Vol.398, p.81-88
Main Authors: Xia, Yang, Li, Qin, Lv, Kangle, Li, Mei
Format: Article
Language:English
Subjects:
Contact
Degradation
Heterojunction
Heterojunctions
Hydroxyl radicals
Metronidazole degradation
Photocatalysis
Spectra
TiO2
Titanium dioxide
Trapping
ZnIn2S4
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Summary:TiO2 hollow spheres (THSs) and ZnIn2S4 (ZIS) flowers were tightly combined to form a heterojunction system for photocatalytic metronidazole degradation. [Display omitted] •Heterojunction was built between TiO2 hollow spheres (THSs) and ZnIn2S4 (ZIS) flowers.•Size discrepancy of THS and ZIS spheres contributes to a well-formed close packing.•TiO2 hollowsphere in the composite possesses a “light collecting effect”.•Optical and electrical tests confirmed the highly-efficient charge-carriers transfer.•Photocatalysis mechanism was verified by OH monitoring and radical trapping experiments. In the past few years, more and more efforts have been made on designing novel and efficient semiconductor-based heterojunction photocatalyst to maximize the capture and conversion efficiency of solar energy. In this work, unique TiO2 hollow sub-microspheres (THSs) and ZnIn2S4 (ZIS) flower-like microspheres were combined through a facile hydrothermal method and novelly applied in photocatalytic metronidazole (MTZ) degradation. The effects of THSs on the physicochemical properties and photocatalytic performance of ZIS were systemically investigated, and the optimal weight ratio of THS and ZIS in the composite was found. Furthermore, various technologies such as photoluminescence (PL), surface photovoltage spectra (SPS) and electrochemical impedance spectra (EIS) were used to verify the intimate contact and highly-efficient charge-carriers transfer between THS and ZIS components. The underlying photocatalysis mechanism was also carefully surveyed and proposed through hydroxyl radicals (OH) monitoring and radical trapping experiments.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2016.12.006