Pt decorated hierarchical Sb2WO6 microspheres as a surface functionalized photocatalyst for the visible-light-driven reduction of nitrobenzene to aniline,Journal of Materials Chemistry A

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Pt decorated hierarchical Sb2WO6 microspheres as a surface functionalized photocatalyst for the visible-light-driven reduction of nitrobenzene to aniline
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-08-03 , DOI: 10.1039/d0ta06099b
Yingzhang Shi _{1,

2,

3,

4} , Huan Wang _{1,

2,

3,

4} , Zhiwen Wang _{1,

2,

3,

4} , Taikang Wu _{1,

2,

3,

4} , Yujie Song _{1,

2,

3,

4} , Binbin Guo _{1,

2,

3,

4,

5} , Ling Wu _{1,

2,

3,

4,

5}

Affiliation

Optimizing the structure of semiconductor materials and introducing functional metal clusters have emerged as an effective strategy to improve the photocatalytic performances of catalysts through the synergistic effect between metals and supports. In this work, Pt nanocluster decorated hierarchical Sb₂WO₆ microspheres which are assembled from ultra-thin nanosheets with only 3.3 nm thickness (Pt/SWO-NS) jointly achieve an efficient photocatalytic reduction of nitrobenzene to aniline and show 10 times higher activity than Pt decorated bulk Sb₂WO₆ (Pt/SWO-bulk). More importantly, the respective roles of SWO-NS and Pt nanoclusters are deeply studied. SWO-NS with a unique 2D structure, abundant unsaturated surface sites and good visible light response would be favorable for stabilizing Pt nanoclusters, adsorbing and activating more nitrobenzene molecules and providing abundant photo-generated electrons. Meanwhile, Pt nanoclusters serve as electron enrichment centers to decompose HCOONH₄ to produce rich ·CO₂⁻ and active H for reducing the activated nitrobenzene molecules. In addition, on combining coordination chemistry, a possible synergistic mechanism for hierarchical Sb₂WO₆ microspheres and Pt nanoclusters is proposed to elucidate the efficient reduction of nitrobenzene to aniline. We believe that this work would provide an effective strategy to optimize catalytic performance by the design of applicable nanocomposites with synergistic effects.

中文翻译：

铂修饰的Sb2WO6分层微球作为表面功能化的光催化剂，用于可见光驱动的硝基苯还原为苯胺

通过金属和载体之间的协同作用，优化半导体材料的结构和引入功能性金属簇已经成为提高催化剂的光催化性能的有效策略。在这项工作中，由仅3.3 nm厚度的超薄纳米片组装而成的Pt纳米簇装饰的分级Sb ₂ WO ₆微球（Pt / SWO-NS）共同实现了硝基苯到苯胺的有效光催化还原，并显示出比10倍高的活性。铂装饰散装Sb ₂ WO ₆（Pt / SWO批量）。更重要的是，对SWO-NS和Pt纳米簇的各自作用进行了深入研究。具有独特的二维结构，丰富的不饱和表面位点和良好的可见光响应的SWO-NS将有利于稳定Pt纳米团簇，吸附和活化更多的硝基苯分子并提供大量的光生电子。同时，铂纳米簇作为电子浓缩中心分解HCOONH ₄，以产生富CO· ₂^-和用于减少活化硝基苯分子活性H。此外，结合配位化学，可能的Sb ₂ WO ₆分层协同机理提出了微球和Pt纳米簇来阐明将硝基苯有效还原为苯胺的方法。我们认为，这项工作将通过设计具有协同作用的适用纳米复合材料，提供一种优化催化性能的有效策略。

更新日期：2020-09-22

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