Bifunctional sensor of pentachlorophenol and copper ions based on nanostructured hybrid films of humic acid and exfoliated layered double hydroxide via a facile layer-by-layer assembly.
Bifunctional sensor of pentachlorophenol and copper ions based on nanostructured hybrid films of humic acid and exfoliated layered double hydroxide via a facile layer-by-layer assembly.
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DOI：
10.1016/j.aca.2013.04.050
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发表时间：
2013-06
影响因子：
6.2
通讯作者：
Shuang Yuan;Dinghua Peng;Xianluo Hu;Jingming Gong
中科院分区：
文献类型：
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作者：
Shuang Yuan;Dinghua Peng;Xianluo Hu;Jingming Gong
采用逐层（LBL）的方法，将腐殖酸（HA）和剥离的Mg-Al-层状双氢氧化物（LDH）纳米片交替组装到ITO基底上，制备了一种新型的、高灵敏度的双功能电化学传感器，用于同时测定五氯苯酚（PCP）和铜离子（Cu 2+）.利用紫外可见光谱、扫描电子显微镜（SEM）和原子力显微镜（AFM）对多层膜进行了表征。发现这些膜具有相对光滑的表面，在每个循环中掺入几乎等量的HA。系统研究了其电化学性能。我们的研究结果表明，这样一个新设计的（LDH/HA）n多层膜，结合的个人属性的HA（有机除草剂和金属离子的双重识别能力）与LDH纳米片（一个刚性的无机基质）一起，可以应用于PCP和Cu（II）的同时分析，没有相互干扰。通过X射线光电子能谱（XPS）和红外光谱（IR）进一步研究了LBL组装的纳米结构，这为双功能传感行为提供了见解。在优化条件下，五氯苯酚的检测限低至0.4 nM，远低于美国环境保护署（U.S. EPA）设定的饮用水中五氯苯酚的指导值（3.7 nM），铜离子的检测限为2.0 nM，远低于世界卫生组织（WHO）设定的指导值（2.0 mgL −1，~ 31.2 nM）。为了达到实际应用的目的，通过监测水样中的PCP和Cu（II），进一步评估了这种简单且具有成本效益的探针。
A new, highly sensitive bifunctional electrochemical sensor for the simultaneous determination of pentachlorophenol (PCP) and copper ions (Cu2+) has been developed, where organic–inorganic hybrid ultrathin films were fabricated by alternate assembly of humic acid (HA) and exfoliated Mg–Al-layered double hydroxide (LDH) nanosheets onto ITO substrates via a layer-by-layer (LBL) approach. The multilayer films were then characterized by means of UV–vis spectrometry, scanning electron microscopy (SEM), and atomic force microscope (AFM). These films were found to have a relatively smooth surface with almost equal amounts of HA incorporated in each cycle. Its electrochemical performance was systematically investigated. Our results demonstrate that such a newly designed (LDH/HA)nmultilayer films, combining the individual properties of HA (dual recognition ability for organic herbicides and metal ions) together with LDH nanosheets (a rigid inorganic matrix), can be applied to the simultaneous analysis of PCP and Cu(II) without interference from each other. The LBL assembled nanoarchitectures were further investigated by X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy (IR), which provides insight for bifunctional sensing behavior. Under the optimized conditions, the detection limit was found to be as low as 0.4nM PCP, well below the guideline value of PCP in drinking water (3.7nM) set by the United States Environmental Protection Agency (U.S. EPA), and 2.0nM Cu2+, much below the guideline value (2.0mgL−1, ~31.2nM) from the World Health Organization (WHO), respectively. Toward the goal for practical applications, this simple and cost-effective probe was further evaluated by monitoring PCP and Cu(II) in water samples.