Facile generation of carbon quantum dots in MIL-53(Fe) particles as localized electron acceptors for enhancing their photocatalytic Cr(vi) reduction†,Inorganic Chemistry Frontiers

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Facile generation of carbon quantum dots in MIL-53(Fe) particles as localized electron acceptors for enhancing their photocatalytic Cr(vi) reduction†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-11-07 00:00:00 , DOI: 10.1039/c8qi01164h
Rongbin Lin _{1,

2,

3,

4} , Shumin Li _{1,

2,

3,

4} , Jingyun Wang _{1,

2,

3,

4} , Jiapeng Xu _{1,

2,

3,

4} , Chunhui Xu _{1,

2,

3,

4} , Jin Wang _{1,

2,

3,

4} , Chunxia Li _{1,

2,

3,

4} , Zhengquan Li _{1,

2,

3,

4}

Affiliation

Metal–organic framework (MOF) photocatalysts have shown promising application in photocatalytic Cr(VI) reduction, but their activities are still restrained by severe charge recombination. To overcome this limitation, herein we propose that the incorporation of cocatalysts as electron acceptors inside MOF pores can provide a better chance to separate the photogenerated electrons, compared with traditional methods to cover cocatalysts on the MOF surface. Following this strategy, we demonstrate a facile method to in situ generate carbon quantum dots (CQDs) as cocatalysts inside a typical MOF photocatalyst (MIL-53(Fe)). The CQDs can serve as efficient localized electron acceptors for separating the photogenerated carriers from the inner metal-oxo clusters among the MOFs, and thus their photocatalytic activities can be greatly improved. Besides acting as electron acceptors, we also reveal that the CQDs can work as photosensitizers for the MOF particles under long-wavelength light irradiation, playing a second role to enhance their activities. The MIL-53(Fe)/CQD composites have been well characterized and their photocatalytic mechanism has been proposed.

中文翻译：

在MIL-53（Fe）粒子中轻松生成碳量子点作为局部电子受体，以增强其光催化还原Cr（vi）的能力†

金属有机骨架（MOF）光催化剂在光催化还原Cr（VI）中已显示出有希望的应用，但它们的活性仍然受到严重的电荷重组的限制。为了克服此限制，在本文中我们提出，与在MOF表面覆盖助催化剂的传统方法相比，在MOF孔中并入助催化剂作为电子受体可以提供更好的机会来分离光生电子。遵循此策略，我们演示了一种简便的原位方法在典型的MOF光催化剂（MIL-53（Fe））中生成碳量子点（CQDs）作为助催化剂。CQD可以用作有效的局部电子受体，以将光生载流子与MOF之间的内部金属-氧代簇分开，因此可以大大提高其光催化活性。除了充当电子受体之外，我们还揭示了CQD可以在长波长光照射下充当MOF颗粒的光敏剂，在增强其活性方面起第二个作用。已对MIL-53（Fe）/ CQD复合材料进行了很好的表征，并提出了其光催化机理。

更新日期：2018-11-07

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