Rapid Microwave-Assisted Nonaqueous Synthesis and Growth Mechanism of AgCl/Ag, and Its Daylight-Driven Plasmonic Photocatalysis
Rapid Microwave-Assisted Nonaqueous Synthesis and Growth Mechanism of AgCl/Ag, and Its Daylight-Driven Plasmonic Photocatalysis
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AgCl/Ag 的微波辅助非水快速合成和生长机制及其日光驱动的等离子体光催化
DOI：
10.1002/chem.201002951
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发表时间：
2011-03-01
影响因子：
4.3
通讯作者：
Zhang, Lizhi
中科院分区：
文献类型：
--
作者：
Jiang, Jing;Zhang, Lizhi
我们报告了快速微波辅助非水合成以及具有受控尺寸和形状的 AgCl/Ag 的生长机制。通过合理改变反应温度和微波照射时间，通过“定向附着”和奥斯特瓦尔德熟化的组合过程，实现了纳米立方体向圆角三角锥的转变。已发现所制备的 AgCl/Ag 的表面等离子共振 (SPR) 特性在一定程度上取决于尺寸、形态和成分。所制备的AgCl/Ag在室内人工日光照明（约1 mWcm(-2)）下表现出高光催化活性和良好的可分解有机污染物（如甲基橙（MO）、罗丹明B（RhB）和五氯苯酚（PCP））的可重复使用性。 AgCl/Ag还被发现表现出优异的收集漫射室内日光（约5 mWcm(-2)）的能力，并且可以在15分钟内完成10 mgL(-1) MO的降解。涉及活性物质捕获的实验表明，AgCl/Ag体系中有机污染物的光催化降解可能通过直接空穴转移进行。这项研究表明，等离子体日光光催化可能为荧光灯照明下全天候室内污染物控制开辟了新领域。
We report on a rapid microwave-assisted nonaqueous synthesis and the growth mechanism of AgCl/Ag with controlled size and shape. By rationally varying the reaction temperature and the microwave irradiation time, we achieved the transformation of nanocubes to rounded triangular pyramids by a combined process of "oriented attachment" and Ostwald ripening. The surface plasmon resonance (SPR) properties of the as-prepared AgCl/Ag have been found to be somewhat dependent on the size, morphology, and composition. The as-prepared AgCl/Ag exhibits high photocatalytic activity and good reusability for decomposing organic pollutants (such as methyl orange (MO), rhodamine B (RhB), and pentachlorophenol (PCP)) under indoor artificial daylight illumination (ca. 1 mWcm(-2)). The AgCl/Ag has also been found to display a superior ability to harvest diffuse indoor daylight (ca. 5 mWcm(-2)), and could complete the degradation of 10 mgL(-1) MO within 15 min. Experiments involving the trapping of active species have shown that the photocatalytic degradation of organic pollutants in the AgCl/Ag system may proceed through direct hole transfer. This study has revealed that plasmonic daylight photocatalysis may open a new frontier for indoor pollutant control around the clock under fluorescent lamp illumination.