Application of Fe3O4@ZnS-CuS and CuS@Ag2S for Photocatalytic H2 Production and Solar Steam Generation
| Autor: | TSAI, WEI-CHE, 蔡維哲 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 For the first part of this study, the Fe3O4@ZnS-CuS composite photocatalyst was prepared. CuS nanoparticles were decorated on Fe3O4@ZnS particles for the synthesis of magnetically separable photocatalysts with magnetic Fe3O4 core, together with heterojunction interfaces between ZnS and CuS. The electron-hole spatial separation ability and photocatalytic activity can be improved by optimizing the amount of CuS grown on ZnS. The highest photocatalytic H2 generation activity of the Fe3O4@ZnS-CuS photocatalyst reached 18000 μmol·g-1·h-1. The crystalline property, morphology, optical property, photocurrent response, magnetic performance, photocatalytic performance, and separation property of the composite photocatalysts were investigated. The photocatalysts can be separated and recycled by a magnet. A mechanism of photocatalytic H2 generation by the Fe3O4@ZnS-CuS photocatalysts was proposed. The recombination of photoexcited electron and hole was suppressed by such kind of electron transfer, leading to the enhanced activity of the Fe3O4@ZnS-CuS photocatalysts. For the second part, CuS@Ag2S core@shell nanoparticles were prepared and stacked on the filter paper to make the film for solar steam generation. Combination of CuS and Ag2S can enhance the light absorption at the visible light and IR range. The optimal water evaporation rate of the CuS@Ag2S/filter paper composite film reaches 1.2 kg·m-2·h-1 under the irradiation of Xe lamp (light intensity = 1000 W/m2). The crystalline property, morphology, and optical property of the CuS and CuS@Ag2S nanoparticles, together with the photothermal property, wetting property, and water evaporation rate of the nanoparticle/filter paper composite film were studied. The composite film can be repeatedly operated after drying. Incorporating the Ag2S with narrow band gap results in increased electron-hole recombination and generates more heat. The water evaporation rate can be improved because of the increased temperature composite film. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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