In Situ SERS Monitoring the Visible Light Photocatalytic Degradation of Nile Blue on Ag@AgCl Single Hollow Cube as a Microreactor,ChemistrySelect

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In Situ SERS Monitoring the Visible Light Photocatalytic Degradation of Nile Blue on Ag@AgCl Single Hollow Cube as a Microreactor
ChemistrySelect ( IF 1.9 ) Pub Date : 2018-01-09 , DOI: 10.1002/slct.201702545
Dingyi Li ₁ , Lei Ouyang ₁ , Ling Yao ₁ , Lihua Zhu ₁ , Xiaoqing Jiang _{1,

2} , Heqing Tang ₃

Affiliation

Reaction monitoring and mechanism study for catalytic processes are important for catalyst design and application, and surface enhanced Raman scattering (SERS) is a promising tool in this area because of its high sensitivity and non‐destructive detection mode. Here a new strategy was proposed for fabricating a micro‐scale Ag@AgCl hollow cube as both a uniform and active photocatalyst and a SERS sensing framework. It was confirmed that the stable micro cube was able to be used as a single particle based platform for SERS monitoring of the photocatalytic reaction on it. This bifunctional material hold both strong SERS enhancement ability (enhancement factor up to 2.4×10⁸) and high photocatalytic activity. Such a micro‐reactor was successfully applied to in situ track the photocatalytic degradation reaction of Nile blue (NB). The SERS monitoring data showed that this photocatalytic reaction apparently followed a pseudo‐first‐order reaction model in kinetics with a rate constant of 0.557 min⁻¹. By looking into the molecular finger‐print information acquired from SERS monitoring, the pathways of the photocatalytic degradation of NB were clarified, which involved the cleavages of two backbones in NB hetero‐ring and the direct oxidation cleavage of naphthalene, as supported by the liquid chromatograph‐mass spectroscopic analysis of the degradation intermediates.

中文翻译：

原位SERS监测作为微反应器的Ag @ AgCl单空心立方体上尼罗河蓝的可见光催化降解

催化过程的反应监测和机理研究对于催化剂的设计和应用很重要，表面增强拉曼散射（SERS）由于其高灵敏度和无损检测模式而在该领域是很有前途的工具。在这里，提出了一种新的策略来制造微米级的Ag @ AgCl中空立方体，将其作为均匀和活性的光催化剂和SERS传感框架。可以确定的是，稳定的微型立方体能够用作基于单颗粒的平台，用于对其上的光催化反应进行SERS监测。这种双功能材料既具有强大的SERS增强能力（增强因子高达2.4×10 ⁸），又具有高光催化活性。这种微型反应器已成功应用于原位跟踪尼罗蓝（NB）的光催化降解反应。SERS监测数据表明，该光催化反应在动力学上显然遵循伪一级反应模型，速率常数为0.557 min ^-1。通过研究从SERS监测获得的分子指纹信息，弄清了NB的光催化降解途径，其中包括NB杂环中两个主链的裂解以及萘的直接氧化裂解（液体支持）。降解中间体的色谱-质谱分析。

更新日期：2018-01-09

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