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

Abstract

Nitrite ions (NO2−), as one of the important inorganic anions, exhibit considerable effects towards the environment and human health.

The Aggregation and Dissolution of Citrate−Coated AgNPs in High Ammonia Nitrogen Wastewater and Sludge from UASB−Anammox Reactor

“…At a low Cl/Ag ratio, Cl − reacted with Ag + and deposited a solid AgCl layer on the surface of AgNPs, which induces aggregation by its inter−particle bridging effect [ 28 , 49 , 50 ]. The NO 2 − was proven to be able to induce aggregation through the selective diazo−coupling strategy [ 51 ]. The carbonate and sulfate have a high affinity to silver (8.46 × 10 −12 M 2 , 1.2 × 10 −5 M 2 ) and form layers of Ag 2 CO 3 and Ag 2 SO 4 , respectively [ 52 ], resulting in less negative ζ−potential and aggregation.…”

Recent Advances in Designing Colorimetric Probes for Nitrite Ions

“…[56] A study on the development of a sensitive and precise colorimetric nitrite ion sensor based on silver nanoparticles (AgNPs) functionalized with p-aminobenzoic acid (PABA) and 4-amino-5-hydroxynaphthalene-2,7-disulphonic acid monosodium salt (AHNDMS) has been published. [57] The system exhibited high sensitivity and selectivity for the nitrite ion, and the brownish-yellow colour of the scattered silver nanoparticles (AgNPs) turned to a pinkish-red hue upon exposure to nitrite ions, suggesting the aggregation of AgNPs (Figure 19). À by silver nanoparticles prepared by using 4-amino-5-hydroxynaphthalene-2,7-disulphonic acid monosodium salt.…”

The synthesis of a chemically reactive and polymeric luminescent gel

“…In the recent past, different nanomaterials, including carbon dots, [76][77][78][79] dye-doped silica nanoparticles, 60 polyethyleneiminecapped CdS quantum dots, 75 4-aminothiophenol modified gold nanorods, 80 graphite-like carbon nitride nanomaterial, 81 ophenylenediamine-BODIPY probe, 82 inorganic complexes like iron and manganese pyridoxal-based complexes, 83 polymeric matrices, [84][85] metal-organic frameworks, 86 functionalized gold and silver nanoparticles etc. [87][88][89][90][91] were developed for colorimetric and fluorescence-based detection of NO2ions. However, over the time, the aggregation of nanomaterials in the solution phase is likely to lead to ambiguity in the measurement of the respective optical signals at practically relevant diverse settings.…”

“…In comparison, uorescence spectrometric and colorimetric methods have emerged as more convenient techniques for nitrite detection. In the recent past, various nanomaterials, including carbon dots, [76][77][78][79] dye-doped silica nanoparticles, 60 polyethyleneimine-capped CdS quantum dots, 75 4aminothiophenol-modied gold nanorods, 80 a graphite-like carbon nitride nanomaterial, 81 an o-phenylenediamine-BODIPY probe, 82 inorganic complexes such as iron and manganese pyridoxal-based complexes, 83 polymeric matrices, 84,85 metal-organic frameworks, 86 and functionalized gold and silver nanoparticles [87][88][89][90][91] have been developed for the However, over time, the aggregation of nanomaterials in the solution phase is likely to lead to ambiguity in the measurement of the respective optical signals in various practically relevant settings. Therefore, despite signicant progress, the design of a portable and stable sensor for nitrite detection has remained a practical challenge.…”