Functionalization and stable synthesis of PET-AuNPs nanocomposites by sonochemistry and electrochemical quantitative and qualitative studies with modified AuNPs-PET / CNT / Au electrode

Polyethylene terephthalate is used in various industries, but due to the lack of functional groups on the surface, it is limited in use and needs surface modification to improve the application. In this study, the surface of PET fibers was first functionalized with carboxylic acid groups. Then, in an alkaline medium, gold nanoparticles were synthesized sonochemically on their surface, and the effect of parameters affecting the size and density of nanoparticles was investigated and optimized (temperature, power of ultrasonic device, and pH). The ability of PET-AuNPs nanocomposites to remove industrial dyes from the environment was used, and the removal and measurement of methyl orange dye from aqueous media were used. The effect of initial dye concentration, time, and pH was investigated and optimized. In quantitative electrochemical dye measurements, the modified AuNPs-PET / CNT / Au electrode had a linear response in the range of 20 to 60 μM. The detection limit of this electrode was 55 μM, and the effect of potential scanning speed on peak flow and the effect of solution pH were investigated. Adsorption equation studies have shown that adsorption follows the obedience isotherm.