In situ fabrication of α-Fe2O3/CaFe2O4 p-n heterojunction with enhanced VOCs photodegradation activity |
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Authors: | Jianmin Wang Xinchao Xu Feng Cao Yunan Wang Song Li Gaowu Qin |
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Affiliation: | 1. Key Lab for Anisotropy and Texture of Materials (MoE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;2. Northeastern Institute of Metal Materials Co., Ltd., Shenyang 110108, China |
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Abstract: | α-Fe2O3/CaFe2O4 p-n heterojunctions were prepared via a simple in-situ hydrolysis process as highly efficient VOCs degradation photocatalyst, wherein no additional conditions such as high pressure, high temperature and surfactants were required. The structures and morphologies of the as-prepared samples were analyzed by XRD, SEM and TEM. The results revealed that α-Fe2O3/CaFe2O4 p-n heterojunctions exhibited superior photocatalytic activity of VOCs degradation compared to pure CaFe2O4 and α-Fe2O3 in both steady model and flow bed model. It can degrade more than 82% of acetaldehyde within 180?min in steady mode and 65% in flow mode under visible light irradiation. The prominent VOCs remove property could be attributed to the strong interfacial contact caused by the in-situ fabrication process and the promoted charge carrier separation efficiency due to the constructing of α-Fe2O3/CaFe2O4 p-n heterojunction. It provides some new insights into the design and fabrication of advanced photocatalytic materials with p-n heterojunction for high efficiency in VOCs photodegradation. |
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Keywords: | In-situ fabrication VOCs photodegradation p-n Heterojunction |
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