首页> 外文期刊>Electrochimica Acta >Metal@MOF Materials in Electroanalysis: Silver-Enhanced Oxidation Reactivity Towards Nitrophenols Adsorbed into a Zinc Metal Organic Framework-Ag@MOF-5(Zn)
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Metal@MOF Materials in Electroanalysis: Silver-Enhanced Oxidation Reactivity Towards Nitrophenols Adsorbed into a Zinc Metal Organic Framework-Ag@MOF-5(Zn)

机译:电分析中的Metal @ MOF材料:吸附到锌金属有机骨架中的硝基酚对银的氧化反应性-Ag @ MOF-5(Zn)

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摘要

Classical Metal-Organic Frameworks (MOFs), although able to accumulate chemicals from solution, are usually electrochemically "inactive". Here, it is demonstrated for the zinc-containing MOF-5(Zn) (and MOF-5W(Zn)) system, that silver incorporation (Ag@MOF-5(Zn), prepared via a solvothermal process) can be used to assist/promote release and electrochemical oxidation of accumulated nitrophenols (2-methyl-4-nitrophenol, 4-nitrophenol, and 2-nitrophenol). Nitrophenols belong to a group of compounds that are present in diesel exhaust and considered harmful pollutants. The enhanced electrochemical detection of nitrophenols at a glassy carbon electrode modified with Ag@MOF-5(Zn) is suggested to be due to analyte accumulation with estimated Langmuirian binding constants of 40 x 10(3)M(-1) (for 2-methyl-4-nitrophenol and 4-nitrophenol) and 15 x 10(3)M(-1) (for 2-nitrophenol) and electrochemical detection/conversion with a current enhancement of more than one order of magnitude due to potential driven release from Ag@MOF-5(Zn). Surface characterization and electrochemical techniques suggest that silver is present in Ag@MOF-5(Zn) in metallic form and probably also embedded into the framework. This silver incorporation changes the electrochemical oxidation behavior towards nitrophenols in MOF-5(Zn) from "inactive" to "active". The new class of metal@MOF materials is highlighted as practical nano-composites. (C) 2016 Elsevier Ltd. All rights reserved.
机译:传统的金属有机骨架(MOF)尽管能够从溶液中累积化学物质,但通常在电化学上是“惰性的”。在此证明,对于含锌的MOF-5(Zn)(和MOF-5W(Zn))体系,可以使用掺入银(Ag @ MOF-5(Zn),通过溶剂热法制备)协助/促进累积的硝基苯酚(2-甲基-4-硝基苯酚,4-硝基苯酚和2-硝基苯酚)的释放和电化学氧化。硝基酚属于存在于柴油机排气中并被视为有害污染物的一组化合物。建议在用Ag @ MOF-5(Zn)修饰的玻碳电极上增强硝基酚的电化学检测,这是由于分析物积累,估计的Langmuirian结合常数为40 x 10(3)M(-1)(对于2-甲基4-硝基苯酚和4-硝基苯酚)和15 x 10(3)M(-1)(对于2-硝基苯酚)和电化学检测/转换,由于潜在的驱动释放,电流增强超过一个数量级Ag @ MOF-5(Zn)。表面表征和电化学技术表明,银以金属形式存在于Ag @ MOF-5(Zn)中,并且也可能嵌入框架中。这种银的引入将MOF-5(Zn)中对硝基苯酚的电化学氧化行为从“非活性”改变为“活性”。新型金属@MOF材料被强调为实用的纳米复合材料。 (C)2016 Elsevier Ltd.保留所有权利。

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