Ag nanoparticles incorporated onto flour (F)/polyvinyl alcohol (PVA) were performed by green synthesis using gamma irradiation to form (F/PVA/Ag) bio‐based nanocomposite hydrogel. The effect of the hydrogel composition and irradiation dose on the gelation percent was investigated. Characterization of (F/PVA) and (F/PVA/Ag) by Fourier transform infrared spectroscopy and thermogravimetric analysis was was investigated. The formation of Ag nanoparticles in (F/PVA/Ag) was confirmed by UV–Vis spectra, X‐ray diffraction, and transmission electron microscopy. The (F/PVA/Ag) nanocomposite exhibited excellent antibacterial activity against the gram‐positive bacteria Staphylococcus aureus (ATCC 29213) and moderate activity against the gram‐negative bacteria Escherichia coli (ATCC 25922). It exhibited excellent antifungal activity against Candida albicans (ATCC 10231). The results proved that this novel developed (F/PVA/Ag) naocomposite has a great potential for use in biomedical applications such as wound dressing hydrogel.
A high yield of graphene oxide (GO) was chemically synthesized from graphite powder utilizing adjusted Hummer's method. The contents of acidic functional groups in GO were determined using potentiometric titration. Composite hydrogels dependent on graphene oxide/poly(2‐acrylamido‐2‐methylpropanesulfonic acid)/polyvinyl alcohol (GO/PAMPS/PVA) were synthesized utilizing a 60Co gamma irradiation source at different doses. The synthesized graphene oxide and composite hydrogels were portrayed via X‐ray diffraction, thermogravimetric analysis, and Fourier transform infrared analysis. The morphology of composite hydrogels was characterized by scanning electron microscope. The gel % and swelling % for the prepared hydrogel demonstrated that the swelling % of hydrogel increased with raising AMPS content. Whereas the increment of GO and increasing the irradiation dose lead to a reduction in the swelling %. The influences of pH, GO percentage, initial dye concentration, the adsorbent dosage, contact time, and temperature on the adsorption of basic blue 3 dye were evaluated and the adsorption capacity was 194.6 mg/g at optimum conditions; pH = 6, GO/PAMPS/PVA composite hydrogels with 5 wt% of GO, initial dye concentration = 200 mg/L, adsorbent dose = 0.1 g, solution volume = 50 mL after 360 min at room temperature (25°C). The adsorption of dye onto the GO/PAMPS/PVA composite hydrogels follows Pseudo‐second‐order adsorption kinetics, fits the Freundlich adsorption isotherm model.
In this study, the copolymer hydrogel was prepared by copolymerization of gum arabic (GA), Poly (vinyl alcohol) (PVA) using gamma irradiation. The factors affecting the preparation conditions of (GA/PVA) copolymer hydrogels such as copolymer composition, copolymer concentration and irradiation dose were investigated. The swelling property of the prepared hydrogels was studied and the results showed that the swelling percent increased with increasing concentration of GA in feed solution and reached to the equilibrium state at 6 h. The obtained hydrogels were characterized using thermal gravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR). The morphology of the prepared hydrogels was examined by Scanning Electron Microscopy (SEM). The mechanical properties of copolymer hydrogel [tensile strength (TS), elongation at break (Eb) and compressive test (CS)] were measured using an Instron testing machine. The prepared hydrogels were investigated for the removal of Cu 2+ , Co 2+ , Pb 2+ and Cd 2+ ions from industrial wastewater. The parameters influencing the metal uptake, for example, pH, time, GA content and temperature were investigated. The adsorption of metal ions by hydrogel increases as follows Pb 2+ > Cu 2+ > Co 2+ > Cd 2+ . The prepared copolymer hydrogel possessed a good affinity towards the adsorption of metal ions, which makes them acceptable for the treatment of industrial Wastewater from such metal ions.
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