Sensitive and selective colorimetric nitrite ion assay using silver nanoparticles easily synthesized and stabilized by AHNDMS and functionalized with PABA.

Autor: Ibrahim MH; Key Laboratory of Bioelectrochemistry & Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University Lanzhou 730070 P. R. China xzhlab@hotmail.com luxq@nwnu.edu.cn.; Department of Chemical Engineering, Faculty of Engineering and Technical Studies, University of Kordofan El-Obeid Sudan., Xue Z; Key Laboratory of Bioelectrochemistry & Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University Lanzhou 730070 P. R. China xzhlab@hotmail.com luxq@nwnu.edu.cn., Abdu HI; Key Laboratory of Bioelectrochemistry & Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University Lanzhou 730070 P. R. China xzhlab@hotmail.com luxq@nwnu.edu.cn., Shinger MI; Department of Chemistry, International University of Africa Khartoum Sudan., Idris AM; Key Laboratory of Bioelectrochemistry & Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University Lanzhou 730070 P. R. China xzhlab@hotmail.com luxq@nwnu.edu.cn., Edris MM; Key Laboratory of Bioelectrochemistry & Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University Lanzhou 730070 P. R. China xzhlab@hotmail.com luxq@nwnu.edu.cn., Shan D; Key Laboratory of Bioelectrochemistry & Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University Lanzhou 730070 P. R. China xzhlab@hotmail.com luxq@nwnu.edu.cn., Lu X; Key Laboratory of Bioelectrochemistry & Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University Lanzhou 730070 P. R. China xzhlab@hotmail.com luxq@nwnu.edu.cn.
Jazyk: angličtina
Zdroj: Nanoscale advances [Nanoscale Adv] 2018 Dec 24; Vol. 1 (3), pp. 1207-1214. Date of Electronic Publication: 2018 Dec 24 (Print Publication: 2019).
DOI: 10.1039/c8na00146d
Abstrakt: Nitrite ions (NO 2 - ), as one of the important inorganic anions, exhibit considerable effects towards the environment and human health. Moreover, over intake of this anion may cause dangerous diseases. Herein, we successfully fabricated silver nanoparticles (AgNPs) using 4-amino-5-hydroxynaphthalene-2, 7-disulphonic acid monosodium salt (AHNDMS) and functionalized them with p -aminobenzoic acid (PABA), and used the functionalised AgNPs as a sensitive and selective colorimetric sensor for nitrite ions. The structure of the as-prepared pure AgNPs was experimentally characterized by different characterizations methods, namely, UV-vis, FT-IR, CV, DPVs, SEM, TEM, and XRD. Additionally, the nitrite ion sensitively and selectively changes the brownish yellow color of the dispersed AgNPs to pinkish red, indicating aggregation of AgNPs, with a detection limit of 0.016 ppm (0.348 μM) and 0.0069 ppm (0.149 μM) by the naked-eye and by UV-vis spectroscopy, respectively. The color change suggested that the aggregation of AgNPs was induced by nitrite-selective diazo-coupling. UV-vis spectra show the disappearance of the absorbance at 474 nm and appearance of a new peak at 532 nm, presumably due to the conversion of AgNPs to silver ions. Moreover, the studies of interference in the proposed sensor confirm its selectivity in the presence of anions as well as cations. Furthermore, linearity was observed between the absorption and the concentration of nitrite ions. More importantly, the proposed sensor was practicably applied for the determination of nitrite in different water samples, such as distilled water, river water, and tap water.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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