Abstract:In this paper, graphene/multi-walled carbon nanotubes (GM) hybrid nanostructure was synthesized by modifying GR using salicylamide. Cu -doped ZnO nanoparticles were successfully decorated on GR/MWNTs hybrids (GM). Their photocatalytic performance for the degradation of methyl orange (MO) was investigated and the results showed that the synthetic GM/ Cu -doped ZnO hybrids exhibited better photocatalytic ability than MWNTs/ Cu -doped ZnO and GR/ Cu -doped ZnO hybrids, in which the degraded rate for 20 mg/L MO so… Show more
“…Zhou et al reported that reduced graphene oxide enhanced the photocatalytic degradation of ZnO for ethylene blue [23]. Herring et al reported a simple one-step synthesis of ZnO nanopyramids supported on reduced graphene oxide nanosheets, and the ZnO-reduced graphene oxide nanocomposites showed an enhanced photocatalytic activity for the degradation of the dye over the unsupported ZnO nanopyramids [24,25].…”
In this study, the enhancement of photocatalytic activity of a graphene oxide/ZnO (GO/ZnO) nanohybrid was achieved via introducing Mg as a co-dopant element by the co-precipitation method. The Mg-doped ZnO nanoparticles were adsorbed on GO sheets. Compared with the catalyses with GO/ZnO nanohybrids, GO/Zn 1−x Mg x O nanohybrids exhibited better photocatalytic activity, in which the decomposition rate of methyl orange (MO) reached 100% within 60 min. The enhancement is attributed to Mg-doping and efficient charge transfer of the photogenerated electrons in the conduction band of ZnO to graphene.
“…Zhou et al reported that reduced graphene oxide enhanced the photocatalytic degradation of ZnO for ethylene blue [23]. Herring et al reported a simple one-step synthesis of ZnO nanopyramids supported on reduced graphene oxide nanosheets, and the ZnO-reduced graphene oxide nanocomposites showed an enhanced photocatalytic activity for the degradation of the dye over the unsupported ZnO nanopyramids [24,25].…”
In this study, the enhancement of photocatalytic activity of a graphene oxide/ZnO (GO/ZnO) nanohybrid was achieved via introducing Mg as a co-dopant element by the co-precipitation method. The Mg-doped ZnO nanoparticles were adsorbed on GO sheets. Compared with the catalyses with GO/ZnO nanohybrids, GO/Zn 1−x Mg x O nanohybrids exhibited better photocatalytic activity, in which the decomposition rate of methyl orange (MO) reached 100% within 60 min. The enhancement is attributed to Mg-doping and efficient charge transfer of the photogenerated electrons in the conduction band of ZnO to graphene.
“…When Ag 2 O is introduced into CaAlONS to form Ag 2 O-CAONCS, Ag 2 O-CAONCS exhibits a sharper decrease in the intensity of the PL peak than CaAlONS. Therefore, Ag 2 O-CAONCS exhibits fast charge transfer and enhanced separation of photo-generated carriers at the interface between Ca 5 Al 6 O 14 and Ag 2 O, which will decrease the recombination efficiency of carriers and enhance the catalytic performance [34,35]. Figure 6 PL Spectra of the CaAlONS, 0.1-Ag 2 O-CAONCS.…”
A photo-deposition method was developed to synthesise argentous oxide/calcium aluminate nanocomposites (Ag2O-CAONCS) with orthorhombic Ca5Al6O14 and cubic Ag2O phases. Micro-morphology, micro-structure, optical, and visible-light catalytic properties were investigated via different techniques. Ag2O enhances visible-light absorption performance and decreases the band gap of the Ag2O-CAONCS. About 20 mL crystal violet (CV) dye (10 mgL–1) is totally degraded using 20 mg Ag2O-CAONCS under sunlight irradiation for 20 min. The enhanced photocatalytic activity of the Ag2O-CAONCS towards CV under sunlight irradiation is ascribed to the reduction of the band gap, improvement in visible-light absorption and inhibitation role of carriers recombination by Ag2O. The high, stable visible-light catalytic activity makes Ag2O-CAONCS promising photocatalysts for removing organic pollutants.
“…Single component photocatalysts have the limitations of absorption spectrum, oxidation, and reduction ability, separation of photo-generated charge carriers. Metal doping is efficient for enhancing photocatalytic performance of photocatalysts by decreasing band gap, recombination of electronhole pairs and improving redox ability [12,13]. It is well known that Ag is an efficient doping element for improving photocatalytic performance of photocatalysts [14].…”
Ag-doped Ca aluminate with different Ag dopant content and polycrystalline structure were obtained via a direct one-step chemical approach using Ag acetate as Ag doping source. Agdoped Ca aluminate is composed of orthorhombic Ca 5 Al 6 O 14 and monoclinic CaAl 2 O 4 phases. The morphology transformation of Ag-doped Ca aluminate from nanoflakes to microscale and nanoscale particles closely depends on Ag dopant content. Ag doping effectively improves visible-light absorption ability and 8 wt% Ag-doped Ca aluminate exhibits the lowest band gap of 1.97 eV. Ag-doped Ca aluminate shows enhanced visible-light photocatalytic activity towards gentian violet than un-doped Ca aluminate under natural sunlight irradiation. 20 mL gentian violet solution (10 mg L −1 ) is totally degraded using 20 mg of 8 wt% Ag-doped Ca aluminate with sunlight irradiation for 30 min and reaction rate constant k of 0.034 min −1 . Visible-light photocatalytic activity is greatly enhanced by Ag doping owing to narrow band gap, low recombination efficiency of charge carriers, high charge transfer efficiency.
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