Nitrogen and Carbon Nitride-Doped TiO2 for Multiple Catalysis and Its Antimicrobial Activity

Abstract

Nitrogen (N) and carbon nitride (C3N4)-doped TiO2 nanostructures were prepared using co-precipitation route. Fixed amount of N and various concentrations (0.1, 0.2, 0.3 wt%) of C3N4 were doped in TiO2 lattice. Through multiple techniques, structural, chemical, optical and morphological properties of samples were thoroughly investigated. XRD results verified anatase TiO2 presence along the substitutional doping of N, while higher degree of crystallinity as well as increased crystallite size were noticed after doping. HR-TEM study revealed formation of nanostructures incorporated on two dimensional (2D) C3N4 nanosheet surface. Elemental composition was checked out using EDS technique which confirmed the presence of dopant in product. Optical characteristics were evaluated with UV–vis spectroscopy which depicted representative redshift in absorption spectra resulted in a reduction in bandgap energy in N/C3N4-doped TiO2 samples. The formation of Ti–O–Ti bonds and different molecular vibrations were disclosed by FTIR. Trap sites and charge carrier’s migration in the materials were evaluated with PL spectroscopy. Multiple catalytic activities (photo, sono and photo-sono) were undertaken to evaluate the dye degradation performance of prepared specimen against methylene blue and ciprofloxacin. Further, antimicrobial activity was analyzed against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacteria.

The enhanced photocatalytic performance and first-principles computational insights of Ba doping-dependent TiO2 quantum dots

“…In absorption spectra, redshift is observed with Ba (2%, 4%) doping, resulting in decreased band gap energy (Eg). Tauc transformation was used to calculate Eg, as displayed in Fig 4b . The estimated Eg was 3.25 eV for TiO 2 [33], and Eg was reduced with a low and high doping concentration of Ba as 3.16 eV and 3.12 eV, respectively. The reduction of the band energy gap can be attributed to the increasing crystallite size demonstrated by the XRD measurements.…”

“…4b . The estimated E g was 3.25 eV for TiO 2 , 33 and E g was reduced with a low and high doping concentration of Ba (3.16 eV and 3.12 eV, respectively). The reduction in the band energy gap can be attributed to the increasing crystallite size, as demonstrated by the XRD measurements.…”

“…The absorption peak identified for the as-prepared TiO 2 at ∼350 nm is attributed to electron transfer from the 2p to 3d region of the VB of O 2− to the CB of Ti 3+ . 33 In the absorption spectra, a redshift is observed with Ba (2%, 4%) doping, resulting in decreased band gap energy ( E g ). Tauc transformation was used to calculate E g , as displayed in Fig.…”

Novel Ta/chitosan-doped CuO nanorods for catalytic purification of industrial wastewater and antimicrobial applications

“…The plates were inoculated aerobically overnight at 37 °C, and the inhibition areas were determined using a Vernier caliper. 43 …”

Improved catalytic activity and bactericidal behavior of novel chitosan/V2O5 co-doped in tin-oxide quantum dots

“…A variety of traditional approaches have been utilized, such as coagulation, 8 evaporation, 9 biological treatment, 10 filtration, advanced oxidation process, 11 electrochemical, photocatalysis, 12 adsorption, 13 and ion exchange 14 for the elimination of these contaminants (color dyes) from waste-water. 15 The main issue is that these traditional methods are costly as applied on large scales. Regarding this, researchers recently adopted various adsorbents, for example, zeolite, semiconductors, activated carbon, polymers, and carbon nanotube-based materials.…”