Polyaniline-Supported Nickel Oxide Flower for Efficient Nitrite Electrochemical Detection in Water.

Content Provider	Europe PMC
Author	Al-Kadhi, Nada S. Hefnawy, Mahmoud A. Alamro, Fowzia S. Pashameah, Rami Adel Ahmed, Hoda A. Medany, Shymaa S.
Editor	Tsou, Chi-Hui
Copyright Year	2023
Abstract	AbstractA modified electrode with conducting polymer (Polyaniline) and NiO nanoflowers was prepared to detect nitrite ions in drinking water. A simple method was used to prepare the NiO nanoflower (NiOnF). Several techniques characterized the as-prepared NiOnF to determine the chemical structure and surface morphology of the NiO, such as XRD, XPS, FT-IR, and TGA. The activity of the electrode toward nitrite sensing was investigated over a wide range of pH (i.e., 2 to 10). The amperometry method was used to determine the linear detection range and limit. Accordingly, the modified electrode GC/PANI/NiOnf showed a linear range of detection at 0.1–1 µM and 1–500 µM. At the same time, the limit of detection (LOD) was 9.7 and 64 nM for low and high concentrations, respectively. Furthermore, the kinetic characteristics of nitrite, such as diffusion and transport coefficients, were investigated in various media. Moreover, the charge transfer resistance was utilized for nitrite electrooxidation in different pH values by the electrochemical impedance technique (EIS). The anti-interfering criteria of the modified surfaces were utilized in the existence of many interfering cations in water (e.g., K+, Na+, Cu2+, Zn2+, Ba2+, Ca2+, Cr2+, Cd2+, Pd2+). A real sample of the Nile River was spiked with nitrite to study the activity of the electrode in a real case sample (response time ~4 s). The interaction between nitrite ions and NiO{100} surface was studied using DFT calculations as a function of adsorption energy.
Journal	Polymers
Volume Number	15
PubMed Central reference number	PMC10097154
Issue Number	7
PubMed reference number	37050419
e-ISSN	20734360
DOI	10.3390/polym15071804
Language	English
Publisher	MDPI
Publisher Date	2023-04-06
Access Restriction	Open
Rights License	Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2023 by the authors.
Subject Keyword	nitrite sensing electrochemical sensor conducting polymer NiO nano-flowers
Content Type	Text
Resource Type	Article
Subject	Chemistry Polymers and Plastics