One-step accelerated synthesis of conducting polymer/silver composites and their catalytic reduction of Cr(VI) ions and p-nitrophenol

0572185 - ÚMCH 2024 RIV CH eng J - Journal Article
Minisy, Islam M. - Taboubi, Oumayma - Hromádková, Jiřina
One-step accelerated synthesis of conducting polymer/silver composites and their catalytic reduction of Cr(VI) ions and p-nitrophenol.
Polymers. Roč. 15, č. 10 (2023), č. článku 2366. E-ISSN 2073-4360
R&D Projects: GA ČR(CZ) GA21-01401S
Institutional support: RVO:61389013
Keywords : conducting polymers * composites * silver nanoparticles
OECD category: Polymer science
Impact factor: 5, year: 2022
Method of publishing: Open access
https://www.mdpi.com/2073-4360/15/10/2366

In this paper, silver nitrate was used as an oxidant to prepare polyaniline, polypyrrole, and poly(3,4-ethylene dioxythiophene)/silver composites through a simultaneous oxidation/reduction process. In addition, p-phenylenediamine was added with 1 mole% relative to the concentrations of the monomers to accelerate the polymerization reaction. The prepared conducting polymer/silver composites were characterized by scanning and transmission electron microscopies to study their morphologies, Fourier-transform infrared and Raman spectroscopies to confirm their molecular structures, and thermogravimetric analysis (TGA) to study their thermal stabilities. The silver content in the composites was estimated by energy-dispersive X-ray spectroscopy, ash analysis, and TGA. The conducting polymer/silver composites were utilized for the remediation of water pollutants through catalytic reduction. Hexavalent chromium ions (Cr(VI)) were photocatalytically reduced to trivalent chromium ions, and p-nitrophenol was catalytically reduced to p-aminophenol. The catalytic reduction reactions were found to follow the first-order kinetic model. Among the prepared composites, polyaniline/silver composite has shown the highest activity for the photocatalytic reduction of Cr(VI) ions with an apparent rate constant of 0.226 min–1 and efficiency of 100% within 20 min. Additionally, poly(3,4-ethylene dioxythiophene)/silver composite showed the highest catalytic activity towards the reduction of p-nitrophenol with an apparent rate constant of 0.445 min–1 and efficiency of 99.8% within 12 min.

Permanent Link: https://hdl.handle.net/11104/0343439