The enhanced photocatalytic activity of TiO2(B)/MIL-100(Fe) composite via Fe–O clusters†

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2021-12-01 DOI:10.1039/D1NJ04569E

Tao Wang, Xiqing Liu, Mei Liu, Runhua Liao, Hongquan Zhan, Xiaoxue Qi, Yongqing Wang and Yanju Huang

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引用次数: 3

Abstract

Black TiO₂ and metal–organic frameworks (MOF) are great materials with light-harvesting ability, redox power and consequently catalytic activity. Here, the integration of MIL-100(Fe) with TiO₂(B) composite was designed for photocatalytic application, which greatly promoted light-harvesting and charge transfer. As expected, the integrated TiO₂(B)/MIL-100(Fe) composite showed high photocatalytic activity due to unique Fe–O–Ti bonds that were constructed, which acted as an electronic tunnel to reduce electronic transfer resistance between MIL-100(Fe) and TiO₂(B). In addition, the presence of Fe–O clusters in MIL-100(Fe) can also promote the charge dissociation and improve catalytic activity via the Fe³⁺/Fe²⁺ redox cycle. This achievement would help us to understand and design charge transfer pathways in the integration of MOF/semiconductor photocatalysts.

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Fe - o簇†增强TiO2(B)/MIL-100(Fe)复合材料的光催化活性

黑色二氧化钛和金属有机框架(MOF)是一种极好的材料，具有光捕获能力、氧化还原能力和催化活性。本文设计了MIL-100(Fe)与TiO2(B)复合材料的集成光催化应用，极大地促进了光收集和电荷转移。正如预期的那样，集成的TiO2(B)/MIL-100(Fe)复合材料由于构建了独特的Fe - o - ti键而表现出很高的光催化活性，该键作为电子隧道降低了MIL-100(Fe)和TiO2(B)之间的电子转移阻力。此外，MIL-100(Fe)中Fe - o簇的存在也可以通过Fe3+/Fe2+氧化还原循环促进电荷解离，提高催化活性。这一成果将有助于我们理解和设计MOF/半导体光催化剂集成过程中的电荷转移途径。

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