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Noble metal nanoparticle-functionalized Zr-metal organic frameworks with excellent photocatalytic performance
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2018-12-06 , DOI: 10.1016/j.jcis.2018.12.024
Jianhao Qiu , Xingguang Zhang , Kailuo Xie , Xiong-Fei Zhang , Yi Feng , Mingmin Jia , Jianfeng Yao

Noble metal nanoparticles (NPs) functionalized MOFs are attractive materials for photocatalytic reactions, and outstanding catalytic performances can be expected, especially when they have intrinsically matched crystal faces between metals and MOFs. This study discovered that the photocatalytic oxidation of aromatic alcohols to aldehydes was enhanced over Au/UiO-66-NH2 or Au/UiO-66 but suppressed over Pt loaded counterparts, whereas the reduction of Cr(VI) was boosted over both two catalysts. In reactions, the conversion of benzyl alcohol was 17.1% over UiO-66-NH2 and 7.6% over UiO-66, and an enhanced conversion was obtained over Au/UiO-66-NH2 (30.5%) and Au/UiO-66 (24.1%). However, the conversion was decreased over Pt/UiO-66-NH2 (9.3%) and Pt/UiO-66 (<1%). Experimental results revealed strong correlations between Zr-MOFs and loaded metal NPs, as Zr centers promoted the formation of Pt(200) planes that suppressed the production of ·O2 intermediates to oxidize aromatic alcohols, whereas Pt(200) exhibited no effect on the Cr(VI) reduction triggered by photo-induced electrons. The findings in this study on constructing noble metal NPs functionalized Zr-MOFs catalysts with specially-matched crystal structures and on distinguishing photocatalytic mechanisms on oxidation of alcohols and reduction of Cr(VI) would provide valuable information for designer (photo)catalysts based on MOFs and their applications in such as catalysis and environmental remediation.



中文翻译:

具有优异光催化性能的贵金属纳米粒子功能化的Zr-金属有机骨架

贵金属纳米粒子(NPs)官能化的MOF是用于光催化反应的有吸引力的材料,并且可以预期到出色的催化性能,尤其是当它们在金属和MOF之间具有固有匹配的晶面时。这项研究发现,芳族醇向醛的光催化氧化反应比Au / UiO-66-NH 2或Au / UiO-66催化作用增强,但对载Pt对应物的抑制作用得到了抑制,而Cr(VI)的还原作用在两种催化剂上均得到了增强。 。在反应中,苯甲醇的转化率相对于UiO-66-NH 2为17.1%,相对于UiO-66为7.6%,并且相对于Au / UiO-66-NH 2(30.5%)和Au / UiO- 66(24.1%)。然而,在Pt / UiO-66-NH 2上转化率降低了(9.3%)和Pt / UiO-66(<1%)。实验结果表明锆的MOF和负载金属NP之间的强相关性,与Zr中心的Pt(200)面的该抑制生产·O2形成2 -中间体氧化芳香醇,而铂(200)显示出没有任何影响Cr(VI)还原是由光诱导电子触发的。这项研究的结果对于构造具有特殊匹配的晶体结构的贵金属NPs功能化Zr-MOFs催化剂以及区分醇氧化和Cr(VI)还原的光催化机理的发现将为基于MOF的设计者(光)催化剂提供有价值的信息及其在催化和环境修复等方面的应用。

更新日期:2018-12-06
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