CaF2-Based Near-Infrared Photocatalyst Using the Multifunctional CaTiO3 Precursors as the Calcium Source

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• 作者：Shouqiang Huang ; Shengjuan Guo ; Qingji Wang ; Nanwen Zhu ; Ziyang Lou ; Liang Li ; Aidang Shan ; Haiping Yuan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 16, 2015
• 年：2015
• 卷：7
• 期：36
• 页码：20170-20178
• 全文大小：764K
• ISSN：1944-8252

文摘

Multistage formation of fluoride upconversion agents from the related-semiconductor precursors provides a promising route for the fabrication of near-infrared (NIR) photocatalysts with high photocatalytic activities. Herein, the cotton templated CaTiO₃ 鈥渟emiconduction鈥?precursors (C-CaTiO₃) were used to synthesize the NIR photocatalyst of Er³⁺/Tm³⁺/Yb³⁺鈥?CaTiO₃/CaF₂/TiO₂) (C-ETYCCT), and the functions of the Ca²⁺ source for CaF₂ and the heterostructure formations were displayed by C-CaTiO₃. The generated CaF₂ acted as the host material for the lanthanide ions, and the heterostructures were constructed among anatase, rutile, and the remaining CaTiO₃. The induced oxygen vacancies and Ti³⁺ ions enabled the samples to utilize most of the upconversion luminescence for photocatalysis. The NIR driven degradation rate of methyl orange (MO) over C-ETYCCT reached 52.34%, which was 1.6 and 2.5 times higher than those of Er³⁺/Tm³⁺/Yb³⁺鈥?CaTiO₃/TiO₂) (C-ETYCT) and Er³⁺/Tm³⁺/Yb³⁺鈥?CaTiO₃/CaF₂) (C-ETYCC), respectively. The degradation rates of MO and salicylic acid over C-ETYCCT with UV鈥搗is鈥揘IR light irradiation were also much higher than those of other samples, which were mainly results of the contributions of its high upconversion luminescence and the efficient electron鈥揾ole pair separation.