In this paper, CuO nanoparticles have been electrodeposited onto the film of multiwalled carbon nanotubes (MWCNTs) modified carbon paste electrode (MWCPE), which fabricated a sensitive nano-copper oxide coated multi-walled carbon nanotubes modified carbon paste electrode (CuO_nano/MWCPE) to detect nitrite. Scanning electron microscope (SEM) image have indicated that copper oxide nanoparticles desposited on MWCPE are homogeneous. The CuO_nano/MWCPE has been used to detect nitrite by square wave voltammetry and cyclic voltammetry techniques. The sensor has exhibited outstanding performance for the electrocatalysis of nitrite. Electrocatalytic oxidation of nitrite at the surface of CuO_nano/MWCPE has been remarkably improved compared to the unmodified CPE and the MWCPE. Under optimum conditions, the oxidation current is linear with the concentration of nitrite ion in the range of 5 μM – 1000 μM. The detection limit has evaluated to be 1.25 μM (S/N = 3). The sensor has been successfully used to determine nitrite in water samples with excellent recoveries.

中文翻译：

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CuO纳米粒子对多壁碳纳米管修饰碳糊电极的表面装饰，用于亚硝酸盐的电催化氧化

本文将CuO纳米粒子电沉积在多壁碳纳米管（MWCNTs）修饰碳糊电极（MWCPE）的膜上，从而制备了敏感的纳米铜氧化物涂层的多壁碳纳米管修饰碳糊电极（CuO _nano / MWCPE ）以检测亚硝酸盐。扫描电子显微镜（SEM）图像表明，沉积在MWCPE上的氧化铜纳米颗粒是均匀的。CuO_纳米/ MWCPE已用于通过方波伏安法和循环伏安法检测亚硝酸盐。该传感器在亚硝酸盐的电催化方面表现出出色的性能。CuO_纳米表面亚硝酸盐的电催化氧化。与未改性的CPE和MWCPE相比，/ MWCPE已得到显着改善。在最佳条件下，氧化电流与亚硝酸根离子浓度在5μM– 1000μM范围内呈线性关系。检测限估计为1.25μM（S / N = 3）。该传感器已成功用于测定水样中的亚硝酸盐，回收率极高。