| 石墨相氮化碳-碘氧化铋层状异质结的构建及其光催化杀菌性能 |
| 摘要点击 3674 全文点击 1241 投稿时间：2017-02-05 修订日期：2017-04-11 |
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| 中文关键词 石墨相氮化碳 异质结 碘氧化铋 光催化 灭菌 |
| 英文关键词 carbon nitride heterostructures bismuth iodide photocatalysis antibacterial |
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| 中文摘要 |
| 以脲素作为前驱物，采用热聚合法制备薄层石墨相氮化碳（g-C3N4），然后在其表面原位合成层状碘氧化铋，构筑石墨相氮化碳-碘氧化铋层状异质结（g-C3N4/BiOI）.合成样品的形貌、比表面积、晶体结构、分子结构、光吸收性能及其表面特性分别采用透射电镜、BET氮吸附、X射线粉末衍射、红外光谱仪、紫外可见漫反射和X射线光电子能谱分析进行表征，并考察合成的催化剂在可见光照射下光催化杀菌性能，研究中通过牺牲剂捕获的方法进一步揭示合成的g-C3N4/BiOI在杀菌过程中的机制.结果表明，合成的样品具有层状异质结结构，其比表面积为63 m2·g-1，合成样品光吸收边可以达到600 nm.光催化活性测试表明g-C3N4/BiOI能够在4 h内将细菌杀死，其杀菌效果明显高于纯的g-C3N4和BiOI，其在光催化灭菌过程中主要的活性物种是光生空穴. |
| 英文摘要 |
| The thin layered graphitic carbon nitride (g-C3N4) was prepared by the thermal polymerization process with urea as the precursor. The layered heterostructure of graphitic carbon nitride-bismuth oxyiodide (g-C3N4/BiOI) was constructed by the in-situ synthetization of bismuth oxyiodide (BiOI) on the surface of the thin layered g-C3N4. The morphology, specific surface area, crystal structure, molecular structure, light absorption properties, and surface properties were characterized by TEM, BET, XRD, FT-IR, UV-Vis DRS, and XPS, respectively. The disinfection performance of the synthesized catalysts under visible light irradiation was investigated. The antibacterial mechanism of g-C3N4/BiOI in the photocatalytic process was further revealed by the capture of sacrificial agents. The results indicate that the prepared sample has a layered heterojunction structure with a specific surface area of 63 m2·g-1 and its light absorption side can obtain 600 nm. The results of the photocatalytic activity test indicate that g-C3N4/BiOI can kill bacteria within 4 h, which is significantly higher than that of g-C3N4 and BiOI. The main active species of g-C3N4/BiOI in the photocatalytic process can be attributed to the photogenerated holes. |
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