Synthesis of β–NaYF4: Yb3+, Tm3+ @ TiO2 and β–NaYF4: Yb3+, Tm3+ @ TiO2 @ Au nanocomposites and effective upconversion–driven photocatalytic properties |
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| Affiliation: | 1. High Level Engineering Research Center of Biopharmaceutical Molecules and Diagnostic Apparatuses, Jiangxi Provincial Colleges and Universities, Jiangxi Science and Technology Normal University, Nanchang, Jiangxi 330013, China;2. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang, Jiangxi 330013, China;1. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;2. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering of Tianjin University, Tianjin 300072, China;1. School of Material Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China;2. School of Material Science and Engineering, Changzhou University, Changzhou 213164, China;3. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzho 213164, China;4. School of Chemistry and Bioengineering, Suzhou University of Science and Technology, Suzhou 215009, China;1. Key Laboratory of the Three Gorges Reservoir Region''s Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China;2. National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing, 400045, China;3. Yunnan Institute of Environmental Science, Kunming, 650034, Yunnan, China;1. Department of Inorganic Nonmetallic Materials Engineering, Dalian Polytechnic University, Dalian 116034, China;2. Liaoning Key Lab for Aquatic Processing Quality and Safety, Dalian Polytechnic University, Dalian 116034, China;1. Institute of Modern Physics, Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan 411105, China;2. Navigation College, Dalian Maritime University, Dalian 116026, China;3. Transportation Equipments and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China |
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| Abstract: | The β–NaYF4: Yb3+, Tm3+ @ TiO2 nanocomposite has been prepared by a facile hydrothermal method followed by the hydrolysis of TBOT, and then NaYF4: Yb3+, Tm3+ @ TiO2, HAuCl4 and sodium citrate were put into an oil bath for reaction to obtain the β–NaYF4: Yb3+, Tm3+ @ TiO2 @ Au core–shell nanocomposite. XRD and HRTEM show that the samples exhibit the hexagonal phase NaYF4, anatase TiO2 and cubic Au, indicating that the core–shell phases of NaYF4?TiO2 or NaYF4?TiO2?Au coexist in these samples. EDS and XPS results show the presence of Na, Y, F, Ti, O and Au elements. When TiO2 was coated on the surface of upconversion nanomaterials of NaYF4: Yb3+, Tm3+, the photocatalytic activity was improved significantly, and the β–NaYF4: Yb3+, Tm3+ @ TiO2 nanocomposite gives the highest photodegradation efficiency for MB and RhB, and decomposes about 73% of MB or 80% of RhB within 4.5 h under simulated solar light irradiation respectively. When the ultraviolet light from simulated sunlight irradiation was removed by the addition of a UV filter, the β–NaYF4: Yb3+, Tm3+ @ TiO2 nanocomposite decomposes about 42% of MB or 48% of RhB within 4.5 h. It means that the upconversion–driven photocatalytic performance (decomposes 42% of MB or 48% of RhB) is more effective than UV light–driven photocatalytic performance (31% of MB or 32% of RhB) in the photodegradation process. In addition, the β–NaYF4: Yb3+, Tm3+ @ TiO2 @ Au core–shell nanocomposite does not exhibit the better photocatalytic activity, and the optimal research will be carried out in the future. |
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| Keywords: | Hydrothermal synthesis Upconversion Photocatalytic performance |
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