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Catalysts 2018, 8(1), 29; https://doi.org/10.3390/catal8010029

Construction of an Ultrasensitive and Highly Selective Nitrite Sensor Using Piroxicam-Derived Copper Oxide Nanostructures

1
Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
2
Dr. M. A. Kazi Institute of Chemistry, University of Sindh, Jamshoro 76080, Pakistan
3
Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
4
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan
*
Authors to whom correspondence should be addressed.
Received: 11 December 2017 / Revised: 2 January 2018 / Accepted: 12 January 2018 / Published: 17 January 2018
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Abstract

In this work, piroxicam-based copper oxide nanostructures (Px-CuO NSs) were synthesized via hydrothermal precipitation in the presence of ammonia. The prepared Px-CuO NSs were subjected to scanning electron microscopy (SEM) and X-ray diffraction (XRD) to obtain morphology and crystallinity, respectively. The SEM study reveals that these Px-CuO NSs are in the form of porous rose-like nanopetals with dotted particles on their surface, while the XRD study confirms their crystalline nature. The Px-CuO NS-based sensors were fabricated by drop-casting them onto the surface of a glassy carbon electrode (GCE) and they were tested for nitrite detection using voltammetry and amperometry. The results show these Px-CuO NSs to be highly stable on the GCE surface with linear amperometric (current vs. time) responses to wide range of nitrite concentrations from 100 to 1800 nM, with limits of detection (LOD) and quantification (LOQ) being 12 nM and 40 nM, respectively. Importantly, the fabricated sensor showed negligible effects for a 10-fold higher concentration of common interfering agents and exhibited excellent selectivity. It was applied successfully for nitrite detection in water samples such as river water, mineral water, and tap water. View Full-Text
Keywords: piroxicam; copper oxide nanostructures; amperometric sensor; nitrite; water samples piroxicam; copper oxide nanostructures; amperometric sensor; nitrite; water samples
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Alsalme, A.; Arain, M.; Nafady, A.; Sirajuddin. Construction of an Ultrasensitive and Highly Selective Nitrite Sensor Using Piroxicam-Derived Copper Oxide Nanostructures. Catalysts 2018, 8, 29.

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