Enhanced photocatalytic performance and mechanism of Au@CaTiO3 composites with au nanoparticles assembled on CaTiO3 nanocuboids

doi:10.3390/mi10040254

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	Enhanced photocatalytic performance and mechanism of Au@CaTiO3 composites with au nanoparticles assembled on CaTiO3 nanocuboids
	Yan, Yuxiang 1; Yang, Hua 1; Yi, Zao 2; Li, Ruishan 1; Wang, Xiangxian 1
刊名	Micromachines
	2019-04-01
卷号	10 期号:4
关键词	Electromagnetic fields Electrons Fourier transform infrared spectroscopy Gold Irradiation Light Light sources Nanoparticles Perovskite Photocatalytic activity Plasmons Rhodium compounds Scanning electron microscopy Surface plasmon resonance X ray photoelectron spectroscopy X ray powder diffraction Au nanoparticle CaTiO3 nanocuboids Composite photocatalysts Diffuse reflectance spectroscopy Localized surface plasmon resonance Photocatalytic performance Photocatalytic reactions Visible-light irradiation
ISSN号	2072-666X
DOI	10.3390/mi10040254
英文摘要	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 Au@CaTiO3 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 Au@CaTiO3 composites, particularly the 4.3%Au@CaTiO3 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 Au@CaTiO3 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. © 2019 by the authors.
资助项目	National Natural Science Foundation of China[51662027]
WOS研究方向	Science & Technology - Other Topics ; Instruments & Instrumentation
语种	英语
出版者	MDPI AG, Postfach, Basel, CH-4005, Switzerland
WOS记录号	WOS:000467772100040
状态	已发表
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114349]
专题	理学院省部共建有色金属先进加工与再利用国家重点实验室
通讯作者	Yang, Hua
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China 2.Southwest Univ Sci & Technol, Joint Lab Extreme Condit Matter Properties, Mianyang 621010, Peoples R China
推荐引用方式 GB/T 7714	Yan, Yuxiang,Yang, Hua,Yi, Zao,et al. Enhanced photocatalytic performance and mechanism of Au@CaTiO3 composites with au nanoparticles assembled on CaTiO3 nanocuboids[J]. Micromachines,2019,10(4).
APA	Yan, Yuxiang,Yang, Hua,Yi, Zao,Li, Ruishan,&Wang, Xiangxian.(2019).Enhanced photocatalytic performance and mechanism of Au@CaTiO3 composites with au nanoparticles assembled on CaTiO3 nanocuboids.Micromachines,10(4).
MLA	Yan, Yuxiang,et al."Enhanced photocatalytic performance and mechanism of Au@CaTiO3 composites with au nanoparticles assembled on CaTiO3 nanocuboids".Micromachines 10.4(2019).