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Bi2S3-decorated three-dimensional BiOCl as a Z-scheme heterojunction with highly exposed {001} facets of BiOCl for enhanced visible-light photocatalytic performance
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2022-06-10 , DOI: 10.1039/d2nj02191a
Mingming Sun 1, 2, 3, 4 , Ruixiao Gao 5 , Bowei Wang 1, 2, 3, 4 , Jiayi Li 1 , Zijing Zhang 1 , Guoyi Bai 6 , Xilong Yan 1, 2, 3, 4 , Yang Li 1, 2, 3, 4 , Ligong Chen 1, 2, 3, 4
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2022-06-10 , DOI: 10.1039/d2nj02191a
Mingming Sun 1, 2, 3, 4 , Ruixiao Gao 5 , Bowei Wang 1, 2, 3, 4 , Jiayi Li 1 , Zijing Zhang 1 , Guoyi Bai 6 , Xilong Yan 1, 2, 3, 4 , Yang Li 1, 2, 3, 4 , Ligong Chen 1, 2, 3, 4
Affiliation
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Bi-based photocatalysts are widely applied in energy and environmental fields by virtue of their excellent oxidation ability. However, there is still no effective method to construct Z-scheme heterojunctions and regulate the surface simultaneously. Herein, a series of BiOCl/Bi2S3 photocatalysts were prepared in a controlled manner via a bottom-up strategy. The higher exposure degree of the {001} facets of BiOCl in the composites was confirmed by XRD. According to TEM and HRTEM, Bi2S3 quantum dots were uniformly loaded on the surface of BiOCl, and the heterojunction was successfully constructed between them. The photocatalytic performances of the composites were evaluated by the degradation of tetracycline (TC) under visible light irradiation. It was found that the degradation rate of BOC-BS-5 was 4.1 and 11.5 times those of BiOCl and Bi2S3, respectively. Moreover, BOC-BS-5 presented excellent stability after four cycle experiments. The remarkable photocatalytic performance could be attributed to the Z-scheme heterojunction, which was confirmed by ESR. The Z-scheme heterojunction retained a strong reduction–oxidation activity and displayed a high charge separation efficiency. For another, according to XPS, the oxygen vacancies in composites were significantly increased, which could promote charge transfer and further improve the photocatalytic performance. Furthermore, ˙O2− and ˙OH were identified to be the main reactive oxygen species in the degradation process.
中文翻译：
Bi2S3 装饰的三维 BiOCl 作为 Z 型异质结，具有高度暴露的 BiOCl {001} 晶面，用于增强可见光光催化性能
铋基光催化剂以其优异的氧化能力被广泛应用于能源和环境领域。然而，目前还没有有效的方法来构建Z型异质结并同时调节表面。在此，通过自下而上的策略以可控的方式制备了一系列BiOCl/Bi 2 S 3光催化剂。XRD证实了复合材料中BiOCl的{001}晶面暴露程度较高。根据 TEM 和 HRTEM，Bi 2 S 3量子点均匀地负载在BiOCl表面，它们之间成功构建了异质结。通过可见光照射下四环素（TC）的降解来评价复合材料的光催化性能。发现BOC-BS-5的降解率分别是BiOCl和Bi 2 S 3的4.1倍和11.5倍， 分别。此外，BOC-BS-5 在四次循环实验后表现出优异的稳定性。显着的光催化性能可归因于 Z 型异质结，ESR 证实了这一点。Z型异质结保留了很强的还原-氧化活性并显示出较高的电荷分离效率。另一方面，根据 XPS，复合材料中的氧空位显着增加，这可以促进电荷转移并进一步提高光催化性能。此外，˙O 2 -和˙OH 被确定为降解过程中的主要活性氧。
更新日期：2022-06-10
中文翻译：
Bi2S3 装饰的三维 BiOCl 作为 Z 型异质结，具有高度暴露的 BiOCl {001} 晶面，用于增强可见光光催化性能
铋基光催化剂以其优异的氧化能力被广泛应用于能源和环境领域。然而，目前还没有有效的方法来构建Z型异质结并同时调节表面。在此，通过自下而上的策略以可控的方式制备了一系列BiOCl/Bi 2 S 3光催化剂。XRD证实了复合材料中BiOCl的{001}晶面暴露程度较高。根据 TEM 和 HRTEM，Bi 2 S 3量子点均匀地负载在BiOCl表面，它们之间成功构建了异质结。通过可见光照射下四环素（TC）的降解来评价复合材料的光催化性能。发现BOC-BS-5的降解率分别是BiOCl和Bi 2 S 3的4.1倍和11.5倍， 分别。此外，BOC-BS-5 在四次循环实验后表现出优异的稳定性。显着的光催化性能可归因于 Z 型异质结，ESR 证实了这一点。Z型异质结保留了很强的还原-氧化活性并显示出较高的电荷分离效率。另一方面，根据 XPS，复合材料中的氧空位显着增加，这可以促进电荷转移并进一步提高光催化性能。此外，˙O 2 -和˙OH 被确定为降解过程中的主要活性氧。
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