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Photocatalysis as an advanced reduction process (ARP): the reduction of 4-nitrophenol using titania nanotubes-ferrite nanocomposites
摘要： TiO2 photocatalysis is an advanced process, employed worldwide for the oxidation of organic compounds, that leads to significant technological applications in the fields of health and environment. The use of the photocatalytic approach in reduction reactions seems very promising and can open new horizons for green chemistry synthesis. For this purpose, titanium dioxide nanotubes (TNTs) were developed in autoclave conditions using TiO2 P25 as a precursor material. Based on these nanotubular substrates, TiO2/CoFe2O4 (TCF) nanocomposites were further obtained by wet impregnation method. The materials were thoroughly characterized and their structural, textural, vibrational, optoelectronic and magnetic properties were determined. The composite materials combine absorbance in the visible optical range and high BET surface area values (~100 m2/g), showing extremely high yield in the photocatalytic reduction of 4-nitrophenol (4-NP), exceeding 94% within short illumination time (only 35 min). The developed nanocomposites were successfully reused in consecutive photocatalytic experiments and were easily removed from the reaction medium using magnets. Both remarkable recycling ability and high-performance stability in the photocatalytic reduction of nitrophenol were observed, thus justifying the significant economic potential and industrial perspectives for this advanced reduction process.
关键词： Cobalt ferrite,4-nitrophenol reduction.,Nanocomposite photocatalyst,TiO2 nanotubes
更新于2025-09-23 15:23:52
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Synthesis and Characterization of Graphene Oxide/Zinc Oxide (GO/ZnO) Nanocomposite and Its Utilization for Photocatalytic Degradation of Basic Fuchsin Dye
摘要： In this study, graphene oxide/zinc oxide (GO/ZnO) nanocomposite was prepared by the decoration of expanded and chemically oxidized graphite oxide nanosheets with zinc oxide (ZnO) nanoparticles synthesized via two-step sol-gel deposition method and used as an effective photocatalyst for degradation of basic fuchsin (BF) dye. Structural properties of GO/ZnO nanocomposite were characterized with X-Ray Diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) methods, and Brunauer-Emmett-Teller (BET) surface area measurement. It was found that the GO/ZnO nanocomposite formed a two-dimensional (2D) structure having a composition of 0.54GO/0.46ZnO (w/w) and average ZnO particle size of 25–30 nm. The band gap of ZnO nanoparticles onto GO nanosheets was found to be 3.25 eV while that of bulk ZnO nanoparticles was determined as 3.70 eV. Photocatalytic degradation works were performed into a UV-chamber by following the concentration of BF dye. Degradation reaction was modeled with the Langmuir-Hinshelwood pseudo first-order kinetic model. GO/ZnO nanocomposite increased the apparent reaction rate constant (k) about three times compared to bulk ZnO nanoparticles under UV light.
关键词： Nanocomposite,Photocatalyst,Graphene oxide,Zinc oxide
更新于2025-09-23 15:23:52
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Boosted photocatalytic performance of uniform hetero-nanostructures of Bi2WO6/CdS and Bi2WO6/ZnS for aerobic selective alcohol oxidation
摘要： A two-dimensional hierarchical structural photocatalyst based on Bi2WO6 was obtained via a hydrothermal method and modified using ZnS and CdS and characterized by physico-chemical techniques XRD, FTIR, SEM, EDAX, and DRS. Their photocatalytic performance toward aerobic oxidation of primary alcohols was performed under incident visible light. In optimal condition, the photocatalytic conversion by modified Bi2WO6 was boosted from 25 to 68% in comparison to bare Bi2WO6 while in all cases the selectivities were as high as 99%. This such high photocatalytic activity was confirmed by PEC and photoluminescence (PL) spectroscopy studies which are related to the improvement of charge recombination and potential energy levels of photogenerated electrons-holes pairs. A plausible mechanism was suggested using a series of scavengers during photocatalytic oxidation reactions. Also, this heterogeneous photocatalyst was reused and recovered several times without loss photocatalytic activity. So, these series of catalysts were synthesized using the green and facial method in water solvent with significant advantages of high photocatalytic reactivity in presence O2 as oxidant upon incident visible light.
关键词： Mechanism,Nanocomposite,Photocatalyst conversion,Alcohol oxidation
更新于2025-09-10 09:29:36