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首页> 外文期刊>RSC Advances >Surface and morphology analyses, and voltammetry studies for electrochemical determination of cerium(iii) using a graphene nanobud-modified-carbon felt electrode in acidic buffer solution (pH 4.0 +/- 0.05)
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Surface and morphology analyses, and voltammetry studies for electrochemical determination of cerium(iii) using a graphene nanobud-modified-carbon felt electrode in acidic buffer solution (pH 4.0 +/- 0.05)

机译：在酸性缓冲溶液中使用石墨烯纳米改性 - 碳毡电极（pH 4.0 +/- 0.05）的表面和形貌分析和用于电化学测定的电化学测定铈（III）的伏安测定

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摘要

Trace determination of radioactive waste, especially Ce3+, by electrochemical methods has rarely been attempted. Ce(3+)is (i) a fluorescence quencher, (ii) an antiferromagnet, and (iii) a superconductor, and it has been incorporated into fast scintillators, LED phosphors, and fluorescent lamps. Although Ce(3+)has been utilized in many industries due to its specific properties, it causes severe health problems to human beings because of its toxicity. Nanomaterials with fascinating electrical properties can play a vital role in the fabrication of a sensor device to detect the analyte of interest. In the present study, surfactant-free 1,8-diaminonaphthalene (DAN)-functionalized graphene quantum dots (DAN-GQDs) with nanobud (NB) morphology were utilized for the determination of Ce(3+)through electrochemical studies. The working electrode, graphene nanobud (GNB)-modified-carbon felt (CF), was developed by a simple drop-coating method for the sensitive detection of Ce(3+)in acetate buffer solution (ABS, pH 4.0 +/- 0.05) at a scan rate of 50 mV s(-1)using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. CV and DPV studies validated the existence of distinctive peaks at approximately +0.20 and +0.93 V (vs.SCE), respectively, with a limit of detection of approximately 2.60 mu M. Furthermore, electrochemical studies revealed that the GNB-modified-CF electrode was (i) stable even after fifteen cycles, (ii) reproducible, (iii) selective towards Ce3+, (iv) strongly pH-dependent, and (v) favored Ce(3+)sensing only at pH 4.0 +/- 0.05. Impedance spectroscopy results indicated that the GNB-modified-CF electrode was more conductive (1.38 x 10(-4)S m(-1)) and exhibited more rapid electron transfer than bare CF, which agrees with the attained Randles equivalent circuit. Microscopy (AFM, FE-SEM, and HR-TEM), spectroscopy (XPS and Raman), XRD, and energy-dispersive X-ray (EDX) analyses of the GNB-modified-CF electrode confirmed the adsorption of Ce(3+)onto the electrode surface and the size of the electrode material. Ce(3+)nanobuds increased from 35-40 to 50-55 nm without changing their morphology. The obtained results provide an insight into the determination of Ce(3+)to develop an electrochemical device with low sensitivity.
机译：通过电化学方法追踪放射性废物，特别是Ce3 +的测定，已经很少尝试。 Ce（3+）是（i）荧光猝灭剂，（ii）反霉菌和（iii）超导体，并已掺入快速闪烁体，LED磷光体和荧光灯中。虽然CE（3+）由于其特定性质而在许多行业中使用，但由于其毒性，它会对人类产生严重的健康问题。具有迷人电性能的纳米材料可以在制造传感器装置中发挥重要作用以检测感兴趣的分析物。在本研究中，使用具有纳米（Nb）形态的无表面活性剂1,8-二氨基萘（Dan） - 官能化石墨烯（Dan-GQD）通过电化学研究测定Ce（3+）。工作电极，石墨烯纳米（GNB）制碳毡（CF）是通过用于乙酸盐缓冲溶液（ABS，pH 4.0 +/- 0.05的Ce（3+）的Ce（3+）的敏感检测。 ）使用循环伏安法（CV）和差分脉冲伏安法（DPV）技术以50mV S（-1）的扫描速率。 CV和DPV研究分别验证了大约+0.20和+ 0.93V（Vs.SCE）的独特峰的存在，其中检测约为2.60μm。此外，电化学研究表明，GNB改性-CF电极（i）即使在十五个循环后稳定，（ii）可重复，（iii）选择性地朝Ce3 +，（iv）强烈依赖于pH依赖性，并且（v）仅在pH 4.0 +/- 0.05时感测到Ce（3+）。阻抗光谱结果表明，GNB改性-CF电极更具导电（1.38×10（-4））M（-1）），并且表现出比裸CF更快速的电子转移，这与达到的Randles等效电路同意。显微镜（AFM，FE-SEM和HR-TEM），光谱学（XPS和拉曼），XRD和能量 - 分散X射线（EDX）分析的GNB改性-CF电极的分析证实了CE的吸附（3+ ）在电极表面和电极材料的尺寸上。 CE（3+）纳米队伍从35-40增加到50-55纳米，而不会改变它们的形态。所得结果提供了对Ce（3+）的测定的洞察，以开发具有低灵敏度的电化学装置。

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  • 来源
    《RSC Advances》 |2020年第61期|共10页
  • 作者

    Ravi Pavithra V.; Thangadurai Daniel T.; Nehru Kasi; Lee Yong Ill; Nataraj Devaraj; Thomas Sabu; Kalarikkal Nandakumar; Jose Jiya;

  • 作者单位

    Anna Univ Sri Ramakrishana Engn Coll Dept Nanosci &

    Technol Coimbatore 641022 Tamil Nadu India;

    Anna Univ Sri Ramakrishana Engn Coll Dept Nanosci &

    Technol Coimbatore 641022 Tamil Nadu India;

    Anna Univ Bharathidasan Inst Technol Dept Chem Tiruchirappalli 620024 Tamil Nadu India;

    Changwon Natl Univ Dept Chem Chang Won 641773 South Korea;

    Bharathiar Univ Dept Phys Coimbatore 641046 Tamil Nadu India;

    Mahatma Gandhi Univ Int &

    Interuniv Ctr Nanosci &

    Nontechnol Kottayam 686560 Kerala India;

    Mahatma Gandhi Univ Int &

    Interuniv Ctr Nanosci &

    Nontechnol Kottayam 686560 Kerala India;

    Mahatma Gandhi Univ Int &

    Interuniv Ctr Nanosci &

    Nontechnol Kottayam 686560 Kerala India;

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