Integrating Mn-ZIF-67 on hollow spherical CdS photocatalysts forming a unique interfacial structure for the efficient photocatalytic hydrogen evolution and degradation under visible light,Environmental Science: Nano

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Integrating Mn-ZIF-67 on hollow spherical CdS photocatalysts forming a unique interfacial structure for the efficient photocatalytic hydrogen evolution and degradation under visible light
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-08-12 , DOI: 10.1039/d0en00353k
Dan You _{1,

2,

3,

4} , Dajun Shi _{4,

5,

6} , Qingrong Cheng _{3,

4,

7,

8} , Yanling Chen _{1,

2,

3,

4} , Zhiquan Pan _{3,

4,

7,

8}

Affiliation

A series of novel hollow spherical composite photocatalysts was easily synthesized under mild conditions. First, by using SiO₂ nanospheres as sacrificial templates, CdS hollow spheres with diameter of about 250 nm were obtained, with a thickness of about 18 nm. Then, Mn-ZIF-67 was coated on the surface of the hollow spherical CdS by magnetic stirring to obtain the hollow spherical CdS@Mn-ZIF-67 composite photocatalyst with large specific surface area (131.1 m² g⁻¹) and very narrow pore size distribution (5.5 nm). The best result for hydrogen evolution was 4356 μmol in 4 h, which was nearly 74 times and 5 times higher than the single Mn-ZIF-67 and single CdS hollow nanospheres, respectively, and the H₂ generation rate was 10889.2 μmol h⁻¹ g⁻¹. The photocatalytic properties of four composite samples and three pure single materials on the degradation of tetracycline (TC) were studied, and the results showed that CdS@Mn-ZIF-67-1 achieved the best photocatalytic activity among them. The enhancement of the activity of the CdS@Mn-ZIF-67 photocatalysts is mainly attributed to the appropriate matching of the VB and CB of the two single components forming an effective channel for charge separation and transfer in the interfaces between CdS and Mn-ZIF-67. Moreover, a reasonable type II charge transfer mechanism was proposed based on the matched band structure of the single component, the active species trapping experiments, and the results of electron spin resonance (ESR).

中文翻译：

在空心球形CdS光催化剂上整合Mn-ZIF-67形成独特的界面结构，可在可见光下有效地光催化氢的释放和降解

在温和条件下可以轻松合成一系列新型的空心球形复合光催化剂。首先，通过使用SiO ₂纳米球作为牺牲模板，获得直径约250nm，厚度约18nm的CdS空心球。然后，通过磁力搅拌将Mn-ZIF-67涂覆在中空球形CdS的表面上，得到比表面积大（131.1m ² g ^-1）非常窄的中空球形CdS @ Mn-ZIF-67复合光催化剂。孔径分布（5.5纳米）。析氢的最佳结果是在4小时内产生4356μmol的氢，分别比单个Mn-ZIF-67和单个CdS空心纳米球以及H ₂高出近74倍和5倍。生成速率为10889.2μmolh ^-1 g ^-1。研究了四种复合样品和三种纯净单一材料对四环素（TC）降解的光催化性能，结果表明，CdS @ Mn-ZIF-67-1在其中具有最佳的光催化活性。CdS @ Mn-ZIF-67光催化剂活性的增强主要归因于两个单一组分的VB和CB的适当匹配，从而形成了电荷分离和在CdS和Mn-ZIF之间界面转移的有效通道-67。此外，基于单组分的匹配能带结构，活性物质的俘获实验以及电子自旋共振（ESR）的结果，提出了一种合理的II型电荷转移机理。

更新日期：2020-09-18

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