MWCNT-OH/石墨烯复合传感器非酶检测农业样品中对氧磷乙基

IF 5.5 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Budi Riza Putra, Elda Nurwidayanti, Siti Fadilah, Munawar Khalil, Erus Rustami, Wulan Tri Wahyuni
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引用次数: 0

摘要

在这项研究中,我们开发了基于羟基化多壁碳纳米管(MWCNT-OH)和石墨烯复合材料的电化学传感器,用于检测农产品中农药残留对氧磷乙基。采用化学处理方法从原始MWCNT中生产MWCNT- oh,随后使用FTIR、拉曼光谱、FESEM-EDX、TEM和XPS技术对其与石墨烯的复合材料进行了表征。将MWCNT-OH/石墨烯复合材料作为电极改性剂涂在玻碳电极(GCE)表面,利用差分脉冲伏安法(DPV)和电化学阻抗谱(EIS)技术研究了其电分析性能。结果表明,在pH为7时,MWCNT-OH与石墨烯的最佳配比为2:8。这可能是由于MWCNT-OH/石墨烯复合材料的电催化活性增强,对氧磷乙基浓度线性范围为0.1-100µM,检测限低至10 nM,灵敏度为1.60µaµM cm−2。此外,该传感器在包括其他农药在内的10种不同干扰物存在下均表现出良好的重现性、稳定性和选择性。最后,对该传感器进行了测试,以确定青苹果和卷心菜作为农产品样品中的对氧磷乙基浓度。该传感器测得的对氧磷乙基浓度与标准分光光度法无显著差异,表明该传感器平台可作为农产品中农药残留的快速检测手段进一步发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
MWCNT-OH/graphene composite sensor for nonenzymatic detection of paraoxon-ethyl in agricultural samples

In this study, we developed electrochemical sensors based on the composite of hydroxylated multiwalled carbon nanotubes (MWCNT-OH) and graphene for paraoxon-ethyl detection as pesticide residues in agricultural products. Chemical treatment was employed to produce MWCNT-OH from pristine MWCNT and its composite with graphene was subsequently characterized using FTIR, Raman spectroscopy, FESEM-EDX, TEM, and XPS techniques. The MWCNT-OH/graphene composite was employed as an electrode modifier on the glassy carbon electrode (GCE) surface, and its electroanalytical performances were studied using differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) techniques. It was revealed the optimum composition ratio between MWCNT-OH and graphene was 2:8, for paraoxon-ethyl detection at pH 7. This could be attributed to the enhanced electrocatalytic activity in the MWCNT-OH/graphene composite which displayed a linear range of paraoxon-ethyl concentration as 0.1–100 µM with a lower detection limit of 10 nM and a good sensitivity of 1.60 µA µM cm−2. In addition, the proposed sensor shows good reproducibility, stability, and selectivity in the presence of 10 different interfering compounds including other pesticides. Ultimately, this proposed sensor was tested to determine the paraoxon-ethyl concentrations in green apples and cabbage as samples of agricultural products. The obtained concentrations of paraoxon-ethyl from this proposed sensor show no significant difference with standard spectrophotometric techniques suggesting this sensing platform might be further developed as a rapid detection of pesticide residue in agricultural products.

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来源期刊
Carbon Letters
Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
7.30
自引率
20.00%
发文量
118
期刊介绍: Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.
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