通过循环伏安法测定基于氧化镍-氮碳量子点纳米颗粒和碳结构修饰的碳浆电极的亚甲基蓝

Khalil Ibrahim Alabid, H. Nasser
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摘要

本文论述了一种测定亚甲基蓝(MB)的电化学方法,该方法的电极是由纳米氧化镍和氮碳量子点(NiO-NCQD)、氮化石墨烯-碳(g-C3N4)、还原氧化石墨烯(rGO)以及石墨粉和石蜡油作为增塑剂改性的碳浆制成的。该电极用作工作电极。 使用该电极绘制了亚甲基蓝的氧化还原曲线。这是一条准可逆曲线,在(pH =1)条件下工作,使用的最佳酸是浓度为(0.1M)的盐酸。研究还发现,其线性范围在(7.99-31.98 mg L-1)之间。氧化和还原的标准偏差(SD)和相对标准偏差(RSD%)分别为(0.361 毫克/升-1 和 0.294 毫克/升-1)和(4.52% 和 3.68%)。回溯结果表明,氧化和还原的定量限(LOQ)和检测限(LOD)分别为(99.65%;99.70%)、(0.24 mg L-1; 0.13 mg L-1)和(0.071 mg L-1; 0.039 mg L-1)。亚甲基蓝采用紫外可见分光光度法(663 纳米)进行分析。
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Determine methylene blue based on carbon paste electrode modified with nanoparticles of nickel oxide-nitrogen carbon quantum dots and carbon structures by cyclic voltammetry
This paper deals with an electrochemical method for the determination of methylene blue (MB) by fabrication of an electrode based on a carbon paste modified with nano-nickel oxide and nitrogen carbon quantum dots (NiO-NCQD), graphene-carbon nitride (g-C3N4), reduced graphene oxide (rGO), and graphite powder and paraffin oil are as a plasticizer. This electrode is used as a working electrode.  The analytical method used is cyclic voltammetry (CV), The oxidation-reduction curve of methylene blue was shown using this electrode. It is a quasi-reversible curve, and it works at (pH =1) and the best acid used is HCl a concentration of (0.1M). It was also found that the linear range is within the range of (7.99-31.98 mg L-1). The standard deviation (SD) and relative standard deviation (RSD%) were obtained at (0.361 mg L-1 and 0.294 mg L-1) and (4.52% and 3.68%) for both oxidation and reduction respectively. Retrospective, the limit of quantitative (LOQ) and limit of detection (LOD) were achieved at (99.65%; 99.70%), (0.24 mg L-1; 0.13 mg L-1), and (0.071 mg L-1; 0.039 mg L-1) for both oxidation and reduction respectively. Methylene blue was analyzed by UV-Vis spectrophotometry at (663 nm).
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