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Preparation and Comparison of Magnetic Nanoparticles and Magnetic Nanoparticles Doped with Cobalt for Photodegradation of Methyl Orange
摘要： This paper describes a study in which magnetic nanoparticles were fabricated via co-precipitation approach. These nanoparticles were then coated with cobalt as a means of enhancing their photocatalytic activity. A variety of different instruments were used to characterize the magnetic nanoparticles including transmission electron microscopy, X-ray diffraction analysis, and scanning electron microscope. They were then tested to determine the extent to which they could effectively degrade harmful dyes in the form of was methyl orange under UV lamp irradiation (365 nm). The performance of standard magnetic nanoparticles was compared with those coated with cobalt in terms of removal of methyl orange to determine the extent to which Co-doped magnetic nanoparticles can more effectively facilitate the photocatalytic degradation of methyl orange in comparison to standard magnetic nanoparticles.
关键词： Nanoparticles,Photocatalyst,Photocatalytic degradation,Methyl orange,Co-doped Fe3O4
更新于2025-09-04 15:30:14
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Optimization of CdS/TiO2 Nanotube-Array Composite Photocatalysts Prepared by Electrodeposition
摘要： Titania nanotube arrays were prepared by titanium anodizing, then CdS/TiO2 nanotube arrays composite photocatalysts were prepared by an AC electrodeposition method for different times. The morphology and crystal structure of the CdS/TiO2 composite photocatalysts were characterized by SEM and XRD. The photoelectrochemical properties of the composites were investigated by means of UV-visible absorption spectra and photocurrent measurements. The photocatalytic activity was evaluated by the degradation of methyl orange under UV-visible light irradiation. The results show that there is an optimum deposited time for the highest photocatalytical activity of the CdS/TiO2 composite photocatalysts under UV-visible light irradiation and the optimum deposited time is determined to 3 min.
关键词： Electrodeposition,Nanotube array,Composite photocatalyst,Methyl orange,CdS/TiO2
更新于2025-09-04 15:30:14
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Bi <sub/>5</sub> O <sub/>7</sub> NO <sub/>3</sub> and Ag/Bi <sub/>5</sub> O <sub/>7</sub> NO <sub/>3</sub> composites: one-step solution combustion synthesis, characterization and photocatalytic properties
摘要： In the present study, Bi5O7NO3 and Ag/Bi5O7NO3 composites, as novel efficient photocatalysts, were synthesized via a one-step solution combustion synthesis (SCS) using bismuth nitrate (Bi(NO3)3·5H2O) as an oxidant, tartaric acid (C4H6O6) as a fuel, and silver nitrate (AgNO3) as an Ag source. The amount of Ag in the composite was tailored by varying the AgNO3 content during the SCS process. The orthorhombic Bi5O7NO3 crystal structure was confirmed by XRD, FT-IR and XPS. It was found by EDS and TEM that in the Ag-containing composite, Ag was uniformly distributed on the Bi5O7NO3 matrix. The Ag decoration improved the Bi5O7NO3 photocatalytic efficiency for methyl orange (MO) degradation, likely owing to the relatively low recombination rates of electrons and holes. The 5 mol% Ag/Bi5O7NO3 composite exhibited the best photocatalytic performance (95% in 60 min), which was 1.5 times higher compared to that of pure Bi5O7NO3. In addition, a mechanism of the photocatalytic MO degradation reaction was proposed, which the reactive species O2? played an important role in degrading pollutants.
关键词： Bi5O7NO3,methyl orange degradation,Ag/Bi5O7NO3 composites,solution combustion synthesis,photocatalytic properties
更新于2025-09-04 15:30:14