Visible-light-responsive TiO2-coated ZnO:I nanorod array films with enhanced photoelectrochemical and photocatalytic performance

ACS Applied Materials & Interfaces
Yuan WangJian-Feng Chen

Abstract

Control of structural and compositional characteristics during fabrication of a versatile visible-light active ZnO-based photocatalyst is a crucial step toward improving photocatalytic pollutant degradation processes. In this work, we report a multifunctional photocatalytic electrode, i.e., TiO2 coated ZnO:I nanorods (ZnO:I/TiO2 NRs) array films, fabricated via a hydrothermal method and a subsequent wet-chemical process. This type of hybrid photocatalytic film not only enhances light absorption with the incorporation of iodine but also possesses increased electron transport capability and excellent chemical stability arising from the unique TiO2-coated 1D structure. Owing to these synergic advantages, the degradation efficiency of the ZnO:I samples reached ∼97% after irradiation for 6 h, an efficiency 62% higher than that of pure ZnO. For RhB photocatalytic degradation experiments in both acidic (pH = 3) and alkaline (pH = 11) solutions, as well as in repeat photodegradation experiments, the ZnO:I/TiO2 NRs films demonstrated high stability and durability under visible-light irradiation. Thus, ZnO:I/TiO2 NRs are considered a promising photocatalytic material to degrade organic pollutants in aqueous eco-environments.

References

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Citations

Jun 20, 2017·Nanotechnology·Kristina AponieneSaulius Juršėnas
Aug 24, 2018·Frontiers in Chemistry·Weitian LinYuanming Zhang
Nov 28, 2018·Current Drug Metabolism·Anjali ChauhanShekhar Agnihotri
Feb 28, 2021·Journal of Environmental Sciences (China)·Yanqing CongQi Wang
Jul 18, 2021·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Salama AlismaailAhmed Alzamly
Jun 28, 2019·ACS Applied Materials & Interfaces·Nan LiXia Tao
Aug 9, 2017·ACS Applied Materials & Interfaces·Bingxi YanLiang Guo

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