title: CaF2-Based Near-Infrared Photocatalyst Using the Multifunctional CaTiO3 Precursors as the Calcium Source.
abstract: 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 "semiconduction" precursors (C-CaTiO3) were used to synthesize the NIR photocatalyst of Er3+/Tm3+/Yb3+-(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+-(CaTiO3/TiO2) (C-ETYCT) and Er3+/Tm3+/Yb3+-(CaTiO3/CaF2) (C-ETYCC), respectively. The degradation rates of MO and salicylic acid over C-ETYCCT with UV-vis-NIR 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-hole pair separation.
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai, 200240, People's Republic of China.
authors: Shouqiang
authors: S
authors: Huang
authors: Daqing Oilfield Engineering Co., Ltd., CNPC , 46 Xiyuan Road, Daqing, Heilongjiang 163712, People's Republic of China.
authors: Shengjuan
authors: S
authors: Guo
authors: Daqing Oilfield Engineering Co., Ltd., CNPC , 46 Xiyuan Road, Daqing, Heilongjiang 163712, People's Republic of China.
authors: Qingji
authors: Q
authors: Wang
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai, 200240, People's Republic of China.
authors: Nanwen
authors: N
authors: Zhu
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai, 200240, People's Republic of China.
authors: Ziyang
authors: Z
authors: Lou
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai, 200240, People's Republic of China.
authors: Liang
authors: L
authors: Li
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai, 200240, People's Republic of China.
authors: Aidang
authors: A
authors: Shan
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai, 200240, People's Republic of China.
authors: Haiping
authors: H
authors: Yuan
keywords: CaTiO3 precursors; heterostructure; near-infrared light; photocatalyst; upconversion