Shi Li, Wang Tao, Zhang Huabin, Chang Kun, Meng Xianguang, Liu Huimin, Ye Jinhua
Graduate School of Chemical Sciences and Engineering Hokkaido University Sapporo Japan; International Center for Materials Nanoarchitectonics (MANA), and Environmental Remediation Materials Unit National Institute for Materials Science (NIMS)1-1 Namiki Tsukuba Ibaraki Japan.
International Center for Materials Nanoarchitectonics (MANA), and Environmental Remediation Materials Unit National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba Ibaraki Japan.
Adv Sci (Weinh). 2015 Feb 9;2(3):1500006. doi: 10.1002/advs.201500006. eCollection 2015 Mar.
The photocatalytic reduction of Cr(VI) is investigated over iron(III)-based metal-organic frameworks (MOFs) structured as MIL-88B. It is found that MIL-88B (Fe) MOFs, containing Fe-μ-oxo clusters, can be used as photocatalyst for the reduction of Cr(VI) under visible light irradiation, which is due to the direct excitation of Fe-μ-oxo clusters. The amine-functionalized MIL-88B (Fe) MOFs (denoted as NH-MIL-88B (Fe)) shows much higher efficiency for the photocatalytic Cr(VI) reduction under visible-light irradiation compared with MIL-88B (Fe). It is revealed that in addition to the direct excitation of Fe-μ-oxo clusters, the amine functionality in NH-MIL-88B (Fe) can also be excited and then transferred an electron to Fe-μ-oxo clusters, which is responsible for the enhanced photocatalytic activity for Cr(VI) reduction. The enhanced photocatalytic activity for Cr(VI) reduction is also achieved for other two amine-functionalized iron(III)-based MOFs (NH-MIL-53 (Fe) and NH-MIL-101 (Fe)).
研究了基于铁（III）的金属有机框架（MOF）结构为MIL-88B时对Cr（VI）的光催化还原作用。发现含有Fe-μ-氧簇的MIL-88B（Fe）MOF可作为光催化剂，在可见光照射下还原Cr（VI），这是由于Fe-μ-氧簇的直接激发。与MIL-88B（Fe）相比，胺功能化的MIL-88B（Fe）MOF（表示为NH-MIL-88B（Fe））在可见光照射下对光催化Cr（VI）还原表现出更高的效率。结果表明，除了Fe-μ-氧簇的直接激发外，NH-MIL-88B（Fe）中的胺官能团也可以被激发，然后将一个电子转移到Fe-μ-氧簇，这是Cr（VI）还原光催化活性增强的原因。对于其他两种胺功能化的基于铁（III）的MOF（NH-MIL-53（Fe）和NH-MIL-101（Fe）），也实现了Cr（VI）还原光催化活性的增强。
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