Abstract:A series of carbon nanotube (CNTs)-supported copper-cobalt catalysts were prepared and investigated in a slurry reactor for their ability to selectively convert syngas into higher carbon number alcohols. The 7.5Cu7.5Co/CNTs catalyst achieved superior selectivity towards the formation of ethanol (30.1%) and C 2+ alcohols (57.7%), while the 10Co5Cu/CNTs catalyst exhibited the largest alcohol space-time yield (372.9 mg g cat -1 h -1). However, the pure Cu (15Cu/CNTs) catalyst displayed negligible activity. Cobalt… Show more
“…3 c), displays two peaks of Cu 2p 3/2 and Cu 2p 1/2 which are decomposed into two peaks at 937.16 and 952.72 eV, corresponding to Cu 0 with satellite peaks appeared at higher binding energy, indicating the existence of Cu 2+ . The ratio of Cu 0 and Cu 2+ has been calculated 95:5 respectively 48 . Figure 3 X-ray photoelectron spectroscopy survey analysis ( a ) and the high-resolution spectra of Zn 2p and Cu 2p ( b ), ( c ) respectively.…”
This study focuses on synthesizing novel nanocomposites, zinc(II)tetrakis(4-phenyl)porphyrin/Cu nanoparticles (ZnTPP/Cu-NPs),with antibacterial activity, fabricated through a single-step green procedure. In this regard, the self-assembly of ZnTPP was carried out through an acid–base neutralization method to prepare ZnTPP nanoparticles. Then, the copper nanoparticles (Cu-NPs) were grown on ZnTPP nanoparticles through a visible-light irradiated photochemical procedure in the absence and presence of polyacrylic acid (PAA) as a modulator. The effect of PAA on the morphological properties of the prepared nanocomposites was evaluated. Eventually, the antibacterial activity of nanocomposites with different morphologies was investigated. In this way, the average zone of inhibition growth of diameter, minimum inhibitory concentration, and minimum bactericidal concentration values was determined. Besides, the cytotoxicity of the nanocomposites was evaluated by (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay MCF-7and (HEK-293) cell lines. The specific features of the synthesized nanocomposites identified them as antibacterial compounds which have therapeutic effects on breast cancer.
“…3 c), displays two peaks of Cu 2p 3/2 and Cu 2p 1/2 which are decomposed into two peaks at 937.16 and 952.72 eV, corresponding to Cu 0 with satellite peaks appeared at higher binding energy, indicating the existence of Cu 2+ . The ratio of Cu 0 and Cu 2+ has been calculated 95:5 respectively 48 . Figure 3 X-ray photoelectron spectroscopy survey analysis ( a ) and the high-resolution spectra of Zn 2p and Cu 2p ( b ), ( c ) respectively.…”
This study focuses on synthesizing novel nanocomposites, zinc(II)tetrakis(4-phenyl)porphyrin/Cu nanoparticles (ZnTPP/Cu-NPs),with antibacterial activity, fabricated through a single-step green procedure. In this regard, the self-assembly of ZnTPP was carried out through an acid–base neutralization method to prepare ZnTPP nanoparticles. Then, the copper nanoparticles (Cu-NPs) were grown on ZnTPP nanoparticles through a visible-light irradiated photochemical procedure in the absence and presence of polyacrylic acid (PAA) as a modulator. The effect of PAA on the morphological properties of the prepared nanocomposites was evaluated. Eventually, the antibacterial activity of nanocomposites with different morphologies was investigated. In this way, the average zone of inhibition growth of diameter, minimum inhibitory concentration, and minimum bactericidal concentration values was determined. Besides, the cytotoxicity of the nanocomposites was evaluated by (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay MCF-7and (HEK-293) cell lines. The specific features of the synthesized nanocomposites identified them as antibacterial compounds which have therapeutic effects on breast cancer.
“…Dovnar R et al [19] researched the antibacterial ability of Cu and Se, and found that Cu have significant effects on Gram positive and Gram negative microorganisms. Alloys composed of Cu and Co atoms have more unique properties and applications, such as catalytic properties [20][21][22], magnetic properties [23], and energy storage characteristics [24], etc. Therefore, it is of great interest to analyze the growth process of Co on Cu substrates.…”
The growth mechanism of Co atoms on Cu atomic substrates was studied by molecular dynamics simulation with large scale atomic/polar massively parallel simulator (LAMMPS). The embedded atom method (EAM) potential was used to investigate the growth processes of Co atoms on different Cu atom configurations. The growth process of Co on Cu substrate was carefully observed. It was found that Co atoms preferentially grow on the (100) facet on the Wulff configuration. To find out under what conditions the core-shell structure is better formed, the number of Cu atoms adsorbed on the surface and the number of Co atoms entering the interior were calculated as a function of the number of deposited atoms. The Wulff configuration was found to be more favorable for the growth of Co atoms on the Cu substrates. And the effect of the size of the Cu substrate on the growth of the Co atoms was also investigated. The results show that the larger the size of the Cu substrate, the more unfavorable the core-shell structure formation. In addition, the effect of temperature on growth was also analyzed. It was found that the higher the temperature, the more unfavorable the growth.
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