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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 3 ‐μ 3 ‐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 3 ‐μ 3 ‐oxo clusters. The amine‐functionalized MIL‐88B (Fe) MOFs (denoted as NH 2 –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 3 ‐μ 3 ‐oxo clusters, the amine functionality in NH 2 –MIL‐88B (Fe) can also be excited and then transferred an electron to Fe 3 ‐μ 3 ‐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 2 –MIL‐53 (Fe) and NH 2 –MIL‐101 (Fe)).
Shi et al. (2015) studied this question.