Amino-functionalized MIL-125(Ti) for photodenitrification of pyridine in fuels via coordination activation by unsaturated Ti4+ centers

文献类型： 外文期刊

第一作者： Wang, Shihui

作者： Wang, Shihui;He, Zhoujun;Wang, Deling;Liang, Ruowen;Wang, Shihui;He, Zhoujun;Wang, Deling;Liu, Xiyao;Liang, Ruowen;Wang, Shihui;Wu, Ling;Wang, Deling;Liang, Ruowen;Si, Ruiru

作者机构：

期刊名称：DALTON TRANSACTIONS （ 影响因子：4.0； 五年影响因子：3.7 ）

ISSN： 1477-9226

年卷期： 2023 年 52 卷 11 期

页码：

收录情况： SCI

摘要： Due to their explicit structure, metal-organic frameworks (MOFs) have been supposed to be credible platforms to research the micro-mechanism of heterogeneous photocatalysis. In this study, amino-functionalized MOFs (MIL-125(Ti)-NH2 (denoted as MTi), UiO-66(Zr)-NH2 (denoted as UZr) and MIL-68(In)-NH2 (denoted as MIn)) with three different metal centers were synthesized and applied for the denitrification of simulated fuels under visible light irradiation, during which pyridine was used as a typical nitrogen-containing compound. The results showed that MTi had the best activity among the above three MOFs, and the denitrogenation rate increased to 80% after 4 h of visible light irradiation. On the grounds of the theoretical calculation of pyridine adsorption and actual activity experiments, it can be presumed that the unsaturated Ti4+ metal centers should be the key active sites. Meanwhile, the XPS and in situ infrared results verified that the coordinatively unsaturated Ti4+ sites facilitate the activation of pyridine molecules through the surface -NMIDLINE HORIZONTAL ELLIPSISTi- coordination species. The coordination-photocatalysis synergism promotes the efficiency of photocatalytic performance and the corresponding mechanism is proposed.

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