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首页> 外文期刊>Chemical engineering journal >Synthesis of sandwich-structured AgBr@Ag@TiO2 composite photocatalyst and study of its photocatalytic performance for the oxidation of benzyl alcohols to benzaldehydes
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Synthesis of sandwich-structured AgBr@Ag@TiO2 composite photocatalyst and study of its photocatalytic performance for the oxidation of benzyl alcohols to benzaldehydes

机译：三明治结构的AgBr @ Ag @ TiO2复合光催化剂的合成及其对苯甲醇氧化为苯甲醛的光催化性能的研究

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Silver halide-based photocatalytic materials have been successfully used in organic contaminant degradation and disinfection, but their application in the oxidation of alcohols to aldehydes has never been reported. Herein, we fabricated sandwich-structured AgBr@Ag@TiO2 composite photocatalyst by a facile multistep route and for the first time studied its photocatalytic performance for the oxidation of benzyl alcohols to benzaldehydes. It was found that the porous TiO2 shell layer can be successfully anchored on the surface of AgBr core by a kinetics-controlled hydrolysis process and the thickness of TiO2 shell layer can be conveniently tuned by adjusting the addition amount of ammonia water during titanium source hydrolysis. The control experiments indicated that the O-2 plays a vital role in promoting the oxidation of benzyl alcohols while non-aqueous solvents are favorable to improving the reaction selectivity from alcohol to aldehyde. Compared to blank TiO2 and AgBr@Ag, sandwich-structured AgBr@Ag@TiO2 exhibited a drastically enhanced photocatalytic activity in terms of benzyl alcohol oxidation under visible light irradiation. The transient photocurrent and photoluminescence (PL) spectrum analyses confirmed that the core-shell structure can effectively promote the separation of photo-generated electrons and holes. The radical scavenging experiments revealed that superoxide radical (.O-2(-)) and hole (h(+)) are the main reactive species responsible for the transformation from benzyl alcohols to benzaldehydes. (C) 2016 Elsevier B.V. All rights reserved.
机译：卤化银基光催化材料已成功用于有机污染物的降解和消毒，但从未报道过将其用于醇氧化为醛的应用。本文中，我们通过一种简便的多步法制备了夹心结构的AgBr @ Ag @ TiO2复合光催化剂，并首次研究了其对苯甲醇氧化为苯甲醛的光催化性能。发现通过动力学控制的水解过程可以将多孔TiO 2壳层成功地锚固在AgBr核的表面上，并且可以通过调节钛源水解期间的氨水的添加量来方便地调节TiO 2壳层的厚度。对照实验表明，O-2在促进苄醇的氧化中起着至关重要的作用，而非水溶剂则有利于提高从醇到醛的反应选择性。与空白的TiO2和AgBr @ Ag相比，三明治结构的AgBr @ Ag @ TiO2在可见光照射下显示出显着增强的苯甲醇氧化光催化活性。瞬态光电流和光致发光（PL）光谱分析证实，核-壳结构可以有效地促进光生电子和空穴的分离。自由基清除实验表明，超氧自由基（.O-2（-））和空穴（h（+））是负责从苯甲醇转化为苯甲醛的主要反应物种。 （C）2016 Elsevier B.V.保留所有权利。

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