La2MgTiO6:Eu2+/TiO2-based composite for methyl orange (MO) decomposition
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In the recent years, exploring new materials with the photocatalytic functions is a hot research subject, but most of the photocatalysts need an excitation source during the photocatalytic process. In this work, we report the double-perovskite La2MgTiO6:Eu2+ phosphor having the purple-blue afterglow luminescence. Our PL results show that the samples upon excitation at the UV light can show a broad Eu2+ band with the maximum emission intensity at 387 nm. The afterglow range is found to match with the UV absorption region of the TiO2. As a result, we design the UV converted Eu2+ afterglow composite by serving the La2MgTiO6:Eu2+ phosphor as a ceramic substrate to immobilize the TiO2. The photocatalytic experiments reveal the afterglow behavior of La2MgTiO6:Eu2+ phosphor can continuously provide the UV photons to the TiO2 absorption, leading to a continuous-photocatalytic methyl orange degradation in the absence of UV irradiation. Together with the photocatalytic process under the UV irradiation and after removal off the excitation source, a maximum photocatalytic time of 3.5 h is detected.
This work was financially supported by the Innovative University Projects of Guangdong province (Project No. 831783), and the Quality Engineering Construction Projects of Beijing Institute of Technology University (Zhuhai Campus) (Project No. 2016003ZL, and 2017007JXGG), as well as Longshan academic talent research supporting program of Southwest University of Science and Technology (Project No. 18lzxt03, and No. 18zx309) and Southwest University of Science and Technology Natural Science Foundation (Project No. 18zx7125).
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