Growth process and CQDs-modified Bi4Ti3O12 square plates with enhanced photocatalytic performance

doi:10.3390/mi10010066

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	Growth process and CQDs-modified Bi4Ti3O12 square plates with enhanced photocatalytic performance
	Zhao, Xinxin 2; Yang, Hua 2; Cui, Ziming 2; Wang, Xiangxian 2; Yi, Zao 1
刊名	Micromachines
	2019-01-18
卷号	10 期号:1
关键词	Bismuth compounds Carbon Carbon Quantum Dots Charge transfer Complexation Electrochemical impedance spectroscopy Electrons Fourier transform infrared spectroscopy High resolution transmission electron microscopy Light Light absorption Light sources Photocatalytic activity Photoluminescence Plates (structural components) Rhodium compounds Scanning electron microscopy Semiconductor quantum dots Semiconductor quantum wells Titanium compounds X ray photoelectron spectroscopy X ray powder diffraction Bi4 Ti3 O12 Charge transfer resistance CQDs Diffuse reflectance spectroscopy Photo-catalytic Photocatalytic performance Square plates TEM (transmission electron microscopy)
DOI	10.3390/mi10010066
英文摘要	Bi4Ti3O12 square plates were synthesized via a hydrothermal route, and their growth process was systematically investigated. Carbon quantum dots (CQDs) were prepared using glucose as the carbon source, which were then assembled on the surface of Bi4Ti3O12 square plates via a hydrothermal route with the aim of enhancing the photocatalytic performance. XRD (X-ray powder diffraction), SEM (scanning electron microscopy), TEM (transmission electron microscopy), UV-vis DRS (diffuse reflectance spectroscopy), XPS (X-ray photoelectron spectroscopy), FTIR (Fourier transform infrared spectroscopy), PL (photoluminescence) spectroscopy, EIS (electrochemical impedance spectroscopy) and photocurrent spectroscopy were used to systematically characterize the as-prepared samples. It is demonstrated that the decoration of CQDs on Bi4Ti3O12 plates leads to an increased visible light absorption, slightly increased bandgap, increased photocurrent density, decreased charge-transfer resistance, and decreased PL intensity. Simulated sunlight and visible light were separately used as a light source to evaluate the photocatalytic activity of the samples toward the degradation of RhB in aqueous solution. Under both simulated sunlight and visible light irradiation, CQDs@Bi4Ti3O12 composites with an appropriate amount of CQDs exhibit obviously enhanced photocatalytic performance. However, the decoration of excessive CQDs gives rise to a decrease in the photocatalytic activity. The enhanced photocatalytic activity of CQDs-modified Bi4Ti3O12 can be attributed to the following reasons: (1) The electron transfer between Bi4Ti3O12 and CQDs promotes an efficient separation of photogenerated electron/hole pairs in Bi4Ti3O12; (2) the up-conversion photoluminescence emitted from CQDs could induce the generation of additional electron/hole pairs in Bi4Ti3O12; and (3) the photoexcited electrons in CQDs could participate in the photocatalytic reactions. © 2019 by the author.
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Instruments & Instrumentation ; Physics
语种	英语
出版者	MDPI AG
WOS记录号	WOS:000459735300065
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114020]
专题	理学院
作者单位	1.Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang; 621010, China 2.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Zhao, Xinxin,Yang, Hua,Cui, Ziming,et al. Growth process and CQDs-modified Bi4Ti3O12 square plates with enhanced photocatalytic performance[J]. Micromachines,2019,10(1).
APA	Zhao, Xinxin,Yang, Hua,Cui, Ziming,Wang, Xiangxian,&Yi, Zao.(2019).Growth process and CQDs-modified Bi4Ti3O12 square plates with enhanced photocatalytic performance.Micromachines,10(1).
MLA	Zhao, Xinxin,et al."Growth process and CQDs-modified Bi4Ti3O12 square plates with enhanced photocatalytic performance".Micromachines 10.1(2019).