Electrochemical sensor based on green-synthesized iron oxide nanomaterial modified carbon paste electrode for Congo red electroanalysis and capacitance performance
Electrochemical sensor based on green-synthesized iron oxide nanomaterial modified carbon paste electrode for Congo red electroanalysis and capacitance performance
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DOI：
10.1080/14328917.2022.2125694
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发表时间：
2022-09
影响因子：
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通讯作者：
Mary Sieugaing Tamwa;J. R. Njimou;B. B. Nguelo-B.;C. Nanseu-Njiki;E. Vunain;B. Tripathy;E. Ngameni
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文献类型：
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作者：
Mary Sieugaing Tamwa;J. R. Njimou;B. B. Nguelo-B.;C. Nanseu-Njiki;E. Vunain;B. Tripathy;E. Ngameni
摘要在这项研究中，一个简单的协议是用来转换非有价值的橙子皮（OP）废物到一个新的传感氧化铁橘子皮纳米材料（FeOP）。通过傅里叶变换红外光谱、X射线衍射、热重分析和扫描电子显微镜-能量色散X射线等物理化学表征证实了改性OP中氧化铁纳米粒子的存在。FeOP用于修饰碳糊电极（CPE/FeOP），其显示出比电容显著增加，达到2939 F.g-1，比在NaCl中10 m.s-1时用CPE获得的高两倍。用CPE/FeOP电分析水溶液中的刚果红（CR），在去离子水和泉水沃茨中的检测限分别为2.8 × 10−7 mol.L−1和8.2 × 10−7 mol.L−1，线性范围为5 - 55 µM。CPE/FeOP电化学传感器适用于废水中刚果的测定。
ABSTRACT In this study, a facile protocol was used to convert non-valuable orange peels (OP) waste into a new sensing iron oxide orange-peel nanomaterial (FeOP). The presence of iron oxide nanoparticles in the modified OP was confirmed by physicochemical characterisations including Fourier-transform infrared spectroscopy, X-ray diffractometry, thermogravimetry, and scanning electron microscopy-energy dispersive X-ray. FeOP was used to modify a carbon paste electrode (CPE/FeOP) which displayed a significant increase in specific capacitance of 2939 F.g−1, two folds higher than that obtained with CPE at 10 m.s−1 in NaCl. The electroanalysis of Congo red (CR) in aqueous solutions using CPE/FeOP displayed detection limits of 2.8 × 10−7 mol.L−1 and 8.2 × 10−7 mol.L−1 respectively in deionised and spring waters, in the linear range of 5 to 55 µM. CPE/FeOP electrochemical sensor is therefore suitable for the determination of Congo red in wastewater.