Abstract
Different chitosan-titanium oxide (CS-TiO2-x, with x = TiO2 loadings of 1, 5, 10,15 and 20 wt%) nanocomposite fibers were prepared and kept separately in each salt solution of CuSO4, CoNO3, AgNO3 and NiSO4 to adsorb Cu2+, Co2+, Ag+, and Ni+ ions, respectively. The metal ions loaded onto CS-TiO2 fibers were reduced to their respective zero-valent metal nanoparticles (ZV-MNPs) like Cu0, Co0, Ag0 and Ni0 by treating with NaBH4. The CS-TiO2 fibers templated with various ZV-MNPs were characterized and investigated for their catalytic efficiency. Among all prepared ZV-MNPs, Cu0 nanoparticles templated on CS-TiO2-15 fibers exhibited high catalytic efficiency for the reduction of dyes (methyl orange (MO), congo red (CR), methylene blue (MB) and acridine orange (AO)) and nitrophenols (4-nitrohphenol (4-NP), 2-nitrophenol (2-NP), 3-nitrophenol (3-NP) and 2,6-dinitrophenol (2,6-DNP)). Besides the good catalytic activities of Cu/CS-TiO2-15 fibers, it could be easily recovered by simply pulling the fiber from the reaction medium.
Highlights
NP), 2-nitrophenol (2-NP), 3-nitrophenol (3-NP) and 2,6-dinitrophenol (2,6-DNP))
We investigated the catalytic activity of Cu/CS-TiO2-15 in the catalytic reduction of congo red (CR), methylene blue (MB) and acridine orange (AO) dyes
We report a simplistic approach to synthesis zero-valent Metals nanoparticles (MNPs) on a supporting nanocomposite material of chitosan and TiO2
Summary
Figure SI-1a–d and SI-2a–e exhibited the UV-vis spectra of MO reduction by NaBH4 as a function of time in the presence of different MNPs templated on CS-TiO2-15 and Cu-NPs loaded on different wt% of TiO2 in CS-TiO2 nanocomposite, respectively. The regular decrease in time was observed by increasing the amount of TiO2 in the nanocomposite, which suggest that TiO2 play its role in the uptake of metal ions This was ascribed to the enhance in the active sites for the uptake of MNPs which were responsible for MO dye reduction[80]. We get better results for the catalytic conversion of 4-NP in the presence of Cu-NPs templated on CS-TiO2-15 as compared to other loaded MNPs on various wt% nanocomposite, which suggest that Cu-NPs are more active towards nitrophenols reduction as compared to other MNPs (Fig. 10a,b). Such a decrease in the catalytic performance might be due to the oxidation of Cu-NPs during handling and their slight release to the solution matrix
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