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Enhanced Photocatalytic Performance and Mechanism of [email protected]3 Composites with Au Nanoparticles Assembled on CaTiO3 Nanocuboids

1
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2
Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(4), 254; https://doi.org/10.3390/mi10040254
Received: 23 March 2019 / Revised: 5 April 2019 / Accepted: 15 April 2019 / Published: 17 April 2019
(This article belongs to the Special Issue Nanostructures for Photocatalysis)
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Abstract

Using P25 as the titanium source and based on a hydrothermal route, we have synthesized CaTiO3 nanocuboids (NCs) with the width of 0.3–0.5 μm and length of 0.8–1.1 μm, and systematically investigated their growth process. Au nanoparticles (NPs) of 3–7 nm in size were assembled on the surface of CaTiO3 NCs via a photocatalytic reduction method to achieve excellent [email protected]3 composite photocatalysts. Various techniques were used to characterize the as-prepared samples, including X-ray powder diffraction (XRD), scanning/transmission electron microscopy (SEM/TEM), diffuse reflectance spectroscopy (UV-vis DRS), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Rhodamine B (RhB) in aqueous solution was chosen as the model pollutant to assess the photocatalytic performance of the samples separately under simulated-sunlight, ultraviolet (UV) and visible-light irradiation. Under irradiation of all kinds of light sources, the [email protected]3 composites, particularly the 4.3%[email protected]3 composite, exhibit greatly enhanced photocatalytic performance when compared with bare CaTiO3 NCs. The main roles of Au NPs in the enhanced photocatalytic mechanism of the [email protected]3 composites manifest in the following aspects: (1) Au NPs act as excellent electron sinks to capture the photoexcited electrons in CaTiO3, thus leading to an efficient separation of photoexcited electron/hole pairs in CaTiO3; (2) the electromagnetic field caused by localized surface plasmon resonance (LSPR) of Au NPs could facilitate the generation and separation of electron/hole pairs in CaTiO3; and (3) the LSPR-induced electrons in Au NPs could take part in the photocatalytic reactions. View Full-Text
Keywords: CaTiO3 nanocuboids; Au nanoparticles; localized surface plasmon resonance; [email protected]3 composite; photocatalytic performance CaTiO3 nanocuboids; Au nanoparticles; localized surface plasmon resonance; [email protected]3 composite; photocatalytic performance
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Yan, Y.; Yang, H.; Yi, Z.; Li, R.; Wang, X. Enhanced Photocatalytic Performance and Mechanism of [email protected]3 Composites with Au Nanoparticles Assembled on CaTiO3 Nanocuboids. Micromachines 2019, 10, 254.

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