An Amine‐Functionalized Iron(III) Metal–Organic Framework as Efficient Visible‐Light Photocatalyst for Cr(VI) Reduction
Abstract
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<sub>3</sub>-μ<sub>3</sub>-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<sub>3</sub>-μ<sub>3</sub>-oxo clusters. The amine-functionalized MIL-88B (Fe) MOFs (denoted as NH<sub>2</sub>-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<sub>3</sub>-μ<sub>3</sub>-oxo clusters, the amine functionality in NH<sub>2</sub>-MIL-88B (Fe) can also be excited and then transferred an electron to Fe<sub>3</sub>-μ<sub>3</sub>-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<sub>2</sub>-MIL-53 (Fe) and NH<sub>2</sub>-MIL-101 (Fe)).
Funding
- Ministry of Education, Culture, Sports, Science and Technology
- Japan Society for the Promotion of Science
- National Key Research and Development Program of China
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