Synthesis, characterization of Cu, N co-doped TiO2 microspheres with enhanced photocatalytic activities

Abstract

The mesoporous Copper, nitrogen co-doped TiO 2 microspheres was prepared via solvothermal approach, followed by nitriding treatment under an ammonia gas flow. The crystalline structures of the as-prepared catalyst and the chemical compositions of Cu,N co-doped TiO 2 were determined using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) respectively. The photocatalytic activity of the as-prepared sample was investigated by monitoring the degradation of Rhodamine-B under visible light irradiation.Experimental results indicated that mesoporous Cu,N co-doped TiO 2 microspheres showed higher photocatalytic activity than Cu-TiO 2 microspheres and anatase TiO 2 under visible light irradiation. The higher photocatalytic activity of the mesoporous Cu,N co-doped TiO 2 microspheres sample could be attributed to the synergistic effects of large BET surface area, extended light absorption, efficient charge separation which was stabilized by the presence of oxygen vacancies. It was discovered that, valence states maintain stability after nitriding treatment. The sample synthesized from 0.1% molar quantity of Cu dopant, and nitrided at 400℃ for 30 min gave the highest photocatalytic activity.

Doping‐Assisted Phase Changing Effect on MoS2 Towards Hydrogen Evolution Reaction in Acidic and Alkaline pH

“…These observations notified the presence of N in NMSd and modified the phase [38] . Generally, the peak at ∼396 eV reflected the formation of N‐Metal‐S, which indicated the replacement of S ion by N ion [39] . The atomic percentage of all the prepared compositions were calculated and summarized from survey spectra analysis in supporting information (depicted in Table S1).…”

“…[38] Generally, the peak at ~396 eV reflected the formation of N-Metal-S, which indicated the replacement of S ion by N ion. [39] The atomic percentage of all the prepared compositions were calculated and summarized from survey spectra analysis in supporting information (depicted in Table S1). All these elemental information obtained from the survey spectra (atomic percentage value) and deconvoluted profile analysis helped to measure the probable composition of NMSd as MoS 2-x N x (x = 0.0386), MoS 2-y N y (y = 0.0738), and MoS 2z N z (z = 0.1037), respectively.…”

Dye degradation performance, bactericidal behavior and molecular docking analysis of Cu-doped TiO2 nanoparticles

“…Antimicrobial effectiveness which depends on the concentration and size displays inverse relation to the size of doped material. 27,36,38,75 Small-sized NPs generate more reactive oxygen species (ROS) which halt effectively in implants of pathogenic bacteria membrane resulting in extrusion of cytoplasmic constituents thus killing bacteria 76,77 Secondly, the strong cationic interaction of Cu ++ with negative parts of bacterial membrane results in signicant bactericidal activity at high concentrations by inducing collapse and cell lysis of bacteria (Fig. 15).…”

Synthesis and Characterization of Various Doped TiO2 Nanocrystals for Dye-Sensitized Solar Cells

“…25 increased surface area-to-volume ratio with better light absorption in the visible spectrum and thus demonstrated the improved photocatalytic activity. 26 Likewise, Mathis et al investigated the photocatalytic activity of Cu/N-TiO 2 nanoparticles. To improve the photocatalytic activity, they suggested the preparation of monodisperse microsphere of nanoparticles.…”

“…Liu et al reported the solvothermal preparation of mesoporous Cu/NT-TiO 2 microspheres. The prepared nanoparticles exhibited an increased surface area-to-volume ratio with better light absorption in the visible spectrum and thus demonstrated the improved photocatalytic activity . Likewise, Mathis et al investigated the photocatalytic activity of Cu/N-TiO 2 nanoparticles.…”