Mu Xixi, Jiang Jifei, Chao Fufang, Lou Yongbing, Chen Jinxi
School of Chemistry and Chemical Engineering, Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials, Southeast University, Nanjing 211189, PR China.
Dalton Trans. 2018 Feb 6;47(6):1895-1902. doi: 10.1039/c7dt04477a.
A series of isostructural UiO-66-X (X = H, NH, Br, (OH), (SH)) catalysts have been successfully synthesized by modifying different functional groups on the ligand. The effects of the ligand modification of UiO-66 were investigated for their photocatalytic activity of Rhodamine B degradation under visible light. Surprisingly, UiO-66-NH and UiO-66-(OH) which have narrow bandgaps and excellent visible light absorption do not show outstanding photocatalytic performances compared to UiO-66 and UiO-66-Br. Electrochemical test results indicated that the conduction band potential of UiO-66-X and the separation efficiency of electrons were quite important in these photocatalytic reactions, other than the electronic effect as reported. Similar photocatalytic degradation behaviors were found for Congo red and methyl orange. Herein, we firstly reported different mechanisms of selective degradation in the case of UiO-66, which subverted the previous understanding of photodegradation behavior.
通过修饰配体上的不同官能团，成功合成了一系列同构的UiO-66-X（X = H、NH、Br、(OH)、(SH)）催化剂。研究了UiO-66配体修饰对其在可见光下降解罗丹明B的光催化活性的影响。令人惊讶的是，与UiO-66和UiO-66-Br相比，具有窄带隙和优异可见光吸收性能的UiO-66-NH和UiO-66-(OH)并未表现出出色的光催化性能。电化学测试结果表明，UiO-66-X的导带电位和电子分离效率在这些光催化反应中非常重要，而非如报道的电子效应。刚果红和甲基橙也表现出类似的光催化降解行为。在此，我们首次报道了UiO-66情况下选择性降解的不同机制，这颠覆了以往对光降解行为的认识。
