Abstract
Herein, a green, room temperature-based fabrication of conducting polymer-poly aminobenzene boronic acid or PAPBA, impregnated colloidal gold nanoparticles (AuNPs) is reported. 3-Aminobenzeneboronic acid (ABBA), was used as the reducing agent, while hydrophilic polymers aqueous blend (PVA and HPMC) was used as stabilizer or dispersant, to facilitate the successful fabrication of the colloidal nanocomposite (Au/PAPBA/PVA-HPMC). Gold salt (Au3+) could act as an oxidant for ABBA and thus polymerize it to PAPBA, while (Au3+) was simultaneously reduced to AuNPs. The colloidal nanocomposite showed absorption maximum at 295 and 535 nm, which are for the π-π* transition of PAPBA and small sized stable and dispersed AuNPs, respectively. The nanocomposite was extensively characterized using various equipment to the emphasize successful reduction of gold salt to Au zero. The nanocomposite exhibited good stability, owing to the semi-interpenetrating polymer network of PAPBA in (PVA-HPMC) blend, on which, the in-situ generated AuNPs were attached. Using the boronic acid-cyanide binding affinity, (Au-PAPBA/PVA-HPMC), was successfully applied as an optical nanoprobe for cyanide ion (CN−) detection in solution. The sensor showed linear range within 0.50–25.0 & 25.0–300.0 μM, and a LOD of 95.8 nM. The sensor was applied to CN− detection in environmental samples, with recovery in the range of (95.2–102.4) %. Moreover, the catalytic properties of (Au-PAPBA/PVA-HPMC), was demonstrated towards the reduction of 4 nitrophenol (4-NP) and methylene blue (MB), with excellent performances, which further attested to the multifunctional applications of the fabricated (Au-PAPBA/PVA-HPMC).
Published Version
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