| Ag2CO3/Bi2O2CO3光催化剂的p-n异质结构筑及活性研究 |
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| 引用本文： | 王俊瑾,张国英,孙亚秋,刘景旺.Ag2CO3/Bi2O2CO3光催化剂的p-n异质结构筑及活性研究[J].高等学校化学学报,2019,40(12):2590. |
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| 作者姓名： | 王俊瑾 张国英 孙亚秋 刘景旺 |
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| 作者单位： | 天津师范大学化学学院,天津市功能分子结构与性能重点实验室,无机-有机杂化功能材料化学教育部重点实验室,天津300387;天津师范大学化学学院,天津市功能分子结构与性能重点实验室,无机-有机杂化功能材料化学教育部重点实验室,天津300387;山东师范大学化学化工与材料科学学院,山东省精细化学品清洁合成重点实验室,山东250014 |
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| 基金项目： | 山东省精细化学品清洁合成重点实验室开放基金(ZDSYS-KF201503) |
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| 摘 要： | 采用先后沉淀法制备了Ag2CO3/Bi2O2CO3(BOC)复合光催化剂. 扫描电子显微镜和透射电子显微镜表征结果表明, 尺寸为8.0~18.5 nm的Ag2CO3颗粒均匀分散于BOC纳米片表面. 两种半导体之间所形成的良好p-n异质界面效应拓宽了BOC的光吸收范围, 并有效促进了光生电子-空穴对的分离. Ag2CO3/BOC复合光催化剂的催化活性明显提高, 其中Ag2CO3含量(质量分数)为0.62%时活性最佳, 降解罗丹明B的速率常数为纯BOC的2.8倍. 结合催化过程中的活性物种研究和两种半导体的相对能带位置, 提出了p-n异质界面空间电荷层的形成以及载流子分离和迁移机制.
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| 关 键 词： | 碳酸氧铋 碳酸银 p-n异质结 光催化 电荷迁移 |
| 收稿时间： | 2019-06-11 |
Construction of Ag2CO3/Bi2O2CO3 p-n Heterojunction and Its Photocatalytic Activity ? |
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| Junjin WANG,Guoying ZHANG,Yaqiu SUN,Jingwang LIU.Construction of Ag2CO3/Bi2O2CO3 p-n Heterojunction and Its Photocatalytic Activity ?[J].Chemical Research In Chinese Universities,2019,40(12):2590. |
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| Authors: | Junjin WANG Guoying ZHANG Yaqiu SUN Jingwang LIU |
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| Institution: | 1. College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry, Ministry of Education, Tianjin Normal University, Tianjin 300387, China;2. College of Chemistry, Chemical Engineering and Materials Science, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Shandong Normal University, Shandong 250014, China |
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| Abstract: | Ag2CO3/Bi2O2CO3(BOC) composite photocatalysts were prepared by a successive precipitation strategy. SEM and TEM results showed that Ag2CO3 nanoparticles were dispersively deposited on the surface of BOC nanosheets. A good p-n heterojunction structure was formed between the two semiconductors. The surface composite of Ag2CO3 effectively widened the light absorption of BOC and promoted the separation of photoinduced carriers. Accordingly, the photoactivity of Ag2CO3/BOC composite was greatly improved. In particular, the sample with Ag2CO3 content of 0.62% showed the best photocatalytic behavior with degradation rate improved by 1.8 times compared with that of BOC. Combining the detected oxidation species and the band positions of the semiconductors, the formation of space charge layer and the charge migration at the p-n heterojunction interface of Ag2CO3 and BOC were proposed. |
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| Keywords: | Bi2O2CO3 Ag2CO3 p-n Heterojunction Photocatalysis Charge migration |
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