Cu2O/Ag co-deposited TiO2 nanotube array film prepared by pulse-reversing voltage and photocatalytic properties

In this experiment, Cu₂O/Ag co-deposition TiO₂ nanotube array (Cu₂O-Ag-TNT) film was prepared on pure Ti substrate with the method of combining anodic oxidation and electrodeposition by pulse-reversing voltage power supply in the electrolyte of NH₄F, ethylene glycol, CuNO₃ · 3H₂O and AgNO₃. The morphology, phase, chemical composition, photocatalytic property and mechanism of the nanotube array film were studied by means of scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction, x-ray photoelectron spectroscopy, transmission electron microscopy, UV-vis diffuse reflectance spectra, photoluminescence and photocatalytic degradation under visible light. The results showed that the depositional Cu₂O and Ag existed in two forms, being the small-particle dispersion and large-particle sedimentary phase in the nanotube arrays: Cu₂O-Ag-TNTs for different doping amounts of Ag could be prepared by adjusting the concentration of AgNO₃ and the reverse voltages; with changing of the doping amount of Ag, the band gap and photo-generated electron-hole pair recombination rate also changed, and under the conditions of annealing and the optimized process parameter, the band gap of the nanotube arrays narrowed 0.49 eV and the rate of electron and pair recombination decreased noticeably; the nanotube array film for the concentration of 0.5 cm² ml^-1 degraded the methylene blue of 8 mg L^-1, and the degradation rate reached above 98%. The co-deposition Cu₂O-Ag-TNT film prepared by the one-step method performed well in the field of photocatalysis under visible light.

Fabrication and characterization of Ag2CO3/SnS2 composites with enhanced visible-light photocatalytic activity for the degradation of organic pollutants

The efficient charge transfer at the interfaces of the Ag₂CO₃/SnS₂ composite due to the inner established electric field (E), which effectively facilitated interfacial charge transfer and improved photogenerated electron–hole pairs separation.

Influence of interface combination of reduced graphene oxide/P25 composites on their visible photocatalytic performance

0.75 wt% RGO/P25 composite possesses a photodegradation rate of 100% after 120 and 150 minutes of irradiation under UV and visible light, respectively.