In situ synthesis of silver nanoparticles on fiber matrix for preparing antibacterial paper
| Autor: | Amini, E., Mohammad Azadfallah |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Doctorat en Enginyeria Tèxtil i Paperera |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Scopus-Elsevier |
| Popis: | In this study, the preparation of antibacterial paper was carried out using in situ synthesis of silver nanoparticles (AgNPs) on bleached cellulosic fiber matrix through chemical reduction of silver nitrate (AgNO3) by two reducing agents of sodium borohydride (NaBH4) and formaldehyde (HCHO) under different molar ratio conditions. After synthesis, during the fabrication of hand-sheets, about 0.05% polyethyleneimine (PEI) was added to fiber suspension as retention aid to promote linking between fiber and nano-particles. The produced papers were then characterized by X-Ray Diffraction (XRD), UV-visible spectra analysis and scanning electron microscopy (SEM). In addition, the antimicrobial activity of AgNPs loaded papers was assessed. From the UV spectroscopy and antibacterial activity results, it was found that by increasing the molar ratio of HCHO:AgNO3 and NaBH4:AgNO3, the maximum absorption, minimum wavelength, minimum particle size, maximum amount of produced nano-silvers and maximum percentage reduction of E. coli (Gram-negative) and S. aureus (Gram-positive) can be obtained. The optimum synthesized samples were gained at 0.05:0.001 ratio in which the formation of agglomerates was minimum. According to the electron microscopy images and X-ray diffraction results, nano-silver particles were formed in a spherical shape with an average crystallite size of 10-100 nm and located mainly on the surface of the fibers. Furthermore, it was demonstrated that the formation of unstable AgNPs agglomerates makes formaldehyde inferior to sodium borohydride as an efficient reductive agent. The contribution of PEI in retention and immobilization of AgNPs against washing and drainage during synthesis and hand-sheet making process was confirmed by SEM images. Hence, it could play an important role in controlling and reducing the migration of the silver particles to the environment. The present results show that in situ synthesis of AgNPs in fiber matrix can provide an appropriate approach in developing antibacterial paper-based products |
| Databáze: | OpenAIRE |
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