Recycling of silver nanoparticles from electronic waste via green synthesis and application of AgNPs-chitosan based nanocomposite on textile material

Abstract

The main thrust of this project is the fabrication of silver nanoparticles (AgNPs) from electronic waste (PCB board) and applying it on 100% cotton fabric as an antimicrobial agent. The nanoparticle formation of silver was done by green synthesis way using an aqueous leaf extract of Eichhornia crassipes. Furthermore, chitosan was also applied to the fabric with silver nanoparticles by coating. FTIR and SEM tests characterized the fabricated silver nanoparticles, and antimicrobial tests were followed by the disc diffusion method. The SEM analysis showed an average particle size of 76.91 nm. The FTIR analysis showed the successful reduction of silver nanoparticles and the bonding with chitosan and cellulose. Besides, the EDX reports confirmed the existence of AgNPs by indicating a strong signal in the silver region. In addition, SEM characteristics analysis confirmed the uniform deposition of silver nanoparticles. Finally, the antimicrobial property was tested against gram-positive (Staphylococcus aureus) and gram-negative (Escherichia coli) bacteria. The antimicrobial result was found satisfactory in the case of green-synthesized recycled AgNPs. However, the effectiveness was not observed to be higher than green-synthesized pure AgNPs. In this study, the zone of inhibition of AgNPs was also compared to the reference antibiotics Ciprofloxacin.

Investigating Medical Functionality of Chitosan-ZnO Nanoparticles Modified Fabric with Enhanced Properties

“…For 40 minutes, the scouring and bleaching procedure was conducted at 100 °C in temperature. This painstaking procedure guarantees that the fabric will satisfy the required standards of quality and look and will be in perfect condition for next treatments and applications [24].…”

“…Afterward, the samples were attached to the Shirley crease recovery tester for a comparable amount of time. Lastly, the value of the crease recovery angle was noted [24].…”

“…An advanced thickness gauge (meter) was used to measure the sample fabrics' thickness in compliance with ASTM-D1777 test standard [24].…”

“…The measured value is multiplied by 100 to obtain the value in g/m2. Two samples underwent the standard test procedure ASTM D 3776 (1996) to determine the mass per unit area (weight) of woven cloth [24].…”

From E-Waste to High-Value Materials: Sustainable Synthesis of Metal, Metal Oxide, and MOF Nanoparticles from Waste Printed Circuit Boards

“…In textile applications, nanoparticles play a role in providing antimicrobial properties. For instance, AgNPs-chitosan-coated cotton fabric, using AgNPs sourced from e-waste via both chemical and environmentally friendly methods while maintaining pH within the range of 7 to 12, is employed to achieve antimicrobial effects [ 130 ].…”