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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），表面和形貌分析，以及用于电化学测定的电化学测定铈（III）的研究（pH 4.0±0.05）

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Trace determination of radioactive waste, especially Ce ~(3+) , 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 μM. Furthermore, electrochemical studies revealed that the GNB-modified-CF electrode was (i) stable even after fifteen cycles, (ii) reproducible, (iii) selective towards Ce ~(3+) , (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 × 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Ce〜（3+）的测定，很少尝试。 Ce〜（3+）是（i）荧光猝灭剂，（ii）反霉素，和（iii）是超导体，它已被掺入快速闪烁体，LED磷光体和荧光灯中。虽然由于其特定的性质，但在许多行业中已经在许多行业中使用了CE〜（3+），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，使用无表面活性剂1,8-二氨基萘（Dan） - 官能化石墨烯量子点（DAN-GQDS）通过电化学研究确定Ce〜（3+）的Ce〜（3+）。制作电极，石墨烯纳米（GNB）制碳毡（CF）是通过简单的滴涂法开发的，用于乙酸盐缓冲溶液（ABS，pH 4.0±0.05）的Ce〜（3+）的敏感检测。在使用循环伏安法（CV）和差分脉冲伏安法（DPV）技术的扫描速率为50 mV S〜（Δ1）。 CV和DPV研究分别验证了大约+0.20和+0.93V（与SCE）的独特峰的存在，其检测限为约2.60μm。此外，电化学研究表明，即使在十五个循环之后，GNB改性-CF电极也稳定，（ii）可重复，（III）对Ce〜（3+），（IV）强烈依赖性，（ v）仅在pH 4.0±0.05时感应CE〜（3+）感测。阻抗光谱结果表明，GNB改性-CF电极更具导电（1.38×10〜（α4）的M〜（α1）），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〜（3的吸附） +）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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