Enhanced photocatalytic activity of La1-xSrxCoO3/Ag3PO4 induced by the synergistic effect of doping and heterojunction
作者： Ning Li , Xiaojuan Chen , Chunmu Yu , Jieming Chen , Hefeng Chen
DOI: 10.1016/J.CERAMINT.2021.04.006
关键词: Photocatalysis 、 Heterojunction 、 Materials science 、 Doping 、 Oxygen 、 Crystal structure 、 Catalysis 、 Inorganic chemistry 、 Perovskite (structure) 、 Electron transfer
摘要: Abstract This study sought to design and synthesize a series of perovskite-based La1-xSrxCoO3/Ag3PO4 (with x = 0–1) heterojunction photocatalysts with different Strontium (Sr) doping contents by simple sol-gel method properties the material were comprehensively characterized. Moreover, tetracycline (TC) was chosen as target pollutant assess effect Sr on catalytic performance LaCoO3/Ag3PO4. Our results demonstrated that partial replacement La3+ Sr2+ coupled shifting Co3+ mixed-valence state Co3+-Co4+ led formation substantially more oxygen vacancies in crystal lattice La1-xSrxCoO3/Ag3PO4. Therefore, doped catalyst exhibited enhanced photocatalytic performance. When x = 0.9, obtained La0·1Sr0·9CoO3/Ag3PO4 exhibit an optimal for TC degradation. Kinetic analyses degradation rate constant system 0.0098 min−1, which is 1.78 times LaCoO3/Ag3PO4, 2.45 SrCoO3/Ag3PO4. Additionally, free radical sequestration experiments indicated OH•, h+, O2•− all participated following order: h+>O2•−>OH•. Finally, mechanisms suggested activity due its strong electron transfer surface Sr-doped La0·1Sr0·9CoO3.
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