基于分子印迹复合材料的新型电化学传感器,使用邻苯二胺、纳米钼粒子和多壁碳纳米管检测水中的三氯生

IF 2.7 4区 化学 Q3 CHEMISTRY, PHYSICAL
Kusumita Dutta, S. Pushpavanam
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引用次数: 0

摘要

研究人员开发了一种基于分子印迹复合材料(MIC)的新型电化学传感器,用于检测三氯生。MIC 是由邻苯二胺(o-PD)、-COOH 功能化多壁碳纳米管(cf-MWCNT)和三氯生通过循环伏安法合成的,在嵌入了 cf-MWCNT 的钼纳米粒子(Mo-NP)(Mo-cf-MWCNT)涂覆的玻璃碳(GC)电极上,去除表面的三氯生后形成 MIC/Mo-cf-MWCNT/GC。在我们早期的工作中,我们制作了两种新型电极 MIC/cf-MWCNT/GC 和 MIC/GC。与 MIC/GC 相比,MIC/cf-MWCNT/GC 中 GC 上 cf-MWCNT 涂层基底的存在提高了传感性能,因为该基底的存在降低了电化学带隙(Eg),增加了德拜长度(λd)、吸附吉布斯自由能(- ΔGads)、电化学表面积(Ae)和表面氧化还原位点浓度(C*)。因此,在使用 MIC 作为传感材料的 cf-MWCNT 涂层基底中利用 Mo-NP 可以进一步提高传感性能。这种新型电极(MIC/Mo-cf-MWCNT/GC)的三氯生检测限(LOD)为 900 ppt,低于使用 MIC/cf-MWCNT/GC (10 ppb)和 MIC/GC (40 ppb)所达到的检测限。构建了 MIC/Mo-cf-MWCNT/GC 的吸附等温线,其 ΔGads 值为 59.049 kJ/mol,表明化学吸附作用更强。为了了解 Mo-cf-MWCNT 在检测三氯生中的作用,研究人员进行了循环伏安法、电化学阻抗光谱法和电化学带隙研究。在存在干扰离子的情况下,这种 MIC/Mo-cf-MWCNT/GC 对三氯生显示出良好的选择性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Molecularly Imprinted Composite-based Novel Electrochemical Sensor Using o-Phenylenediamine, Molybdenum Nanoparticle, and Multiwalled Carbon Nanotube for Triclosan Detection from Water

A novel electrochemical molecularly imprinted composite (MIC)-based sensor for detection of triclosan was developed. MIC was synthesized from o-phenylenediamine (o–PD), -COOH functionalized multiwalled carbon nanotube (cf-MWCNT), and triclosan by cyclic voltammetry on molybdenum nanoparticle (Mo-NP) embedded cf-MWCNT (Mo-cf-MWCNT) coated glassy carbon (GC) electrode, following removal of surface triclosan to form MIC/Mo-cf-MWCNT/GC. In our earlier work, two novel electrodes MIC/cf-MWCNT/GC and MIC/GC were fabricated. The presence of cf-MWCNT coating substrate on GC in MIC/cf-MWCNT/GC had improved the sensing performance than MIC/GC since presence of this substrate had decreased the electrochemical band gap (Eg) and increased Debye length (λd), Gibb’s free energy of adsorption (− ΔGads), electrochemical surface area (Ae), and surface redox site concentration (C*). Therefore, further improvement in sensing performance can be carried out by utilizing Mo-NP in the cf-MWCNT coating substrate using MIC to be the sensing material. This novel electrode (MIC/Mo-cf-MWCNT/GC) provided a limit of detection (LOD) of 900 ppt of triclosan, which was lower than the LOD achieved by using MIC/cf-MWCNT/GC (10 ppb) and MIC/GC (40 ppb). Adsorption isotherm was constructed for MIC/Mo-cf-MWCNT/GC delivering − ΔGads value of 59.049 kJ/mol indicating stronger chemisorption. To understand the role of Mo-cf-MWCNT in detection of triclosan, cyclic voltammetry, electrochemical impedance spectroscopy, and electrochemical band gap studies were conducted. This MIC/Mo-cf-MWCNT/GC showed good selectivity towards triclosan in presence of interfering ions.

Graphical Abstract

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来源期刊
Electrocatalysis
Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY
CiteScore
4.80
自引率
6.50%
发文量
93
审稿时长
>12 weeks
期刊介绍: Electrocatalysis is cross-disciplinary in nature, and attracts the interest of chemists, physicists, biochemists, surface and materials scientists, and engineers. Electrocatalysis provides the unique international forum solely dedicated to the exchange of novel ideas in electrocatalysis for academic, government, and industrial researchers. Quick publication of new results, concepts, and inventions made involving Electrocatalysis stimulates scientific discoveries and breakthroughs, promotes the scientific and engineering concepts that are critical to the development of novel electrochemical technologies. Electrocatalysis publishes original submissions in the form of letters, research papers, review articles, book reviews, and educational papers. Letters are preliminary reports that communicate new and important findings. Regular research papers are complete reports of new results, and their analysis and discussion. Review articles critically and constructively examine development in areas of electrocatalysis that are of broad interest and importance. Educational papers discuss important concepts whose understanding is vital to advances in theoretical and experimental aspects of electrochemical reactions.
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