Nickel and sulfur codoped TiO2 nanoparticles for efficient visible light photocatalytic activity

Abstract

In this work, Nickel (Ni) and sulfur (S) codoped TiO2 nanoparticles were prepared by a sol-gel technique. The as-prepared catalyst was characterized using X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), FT-Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectra (DRS) for investigating crystal structure, crystal phase, particle size and bandgap energy of these samples. The photocatalytic performances of all the prepared catalysts have been investigated for the degradation of methylene blue (MB) under visible light irradiation. It was noticed that Ni-S codoped TiO2(Ni-S/TiO2) nanoparticles exhibited much higher photocatalytic activity compared with pure, Ni and S doped TiO2 due to higher visible light absorption and probable decrease in the recombination of photo-generated charges. It was decided that the great visible light absorption was created for codoped TiO2 by the formation of impurity energy states near both the edges of the collection, which works as trapping sites for both the photogenerated charges to decrease the recombination process.

Visible light induced self‐cleaning performance of iron‐doped TiO2 nanoparticles for surface applications

“…Doping or codoping of metals or nonmetals into TiO 2 can modify its band gap, leading to the development of a more efficient photocatalyst that can respond to visible light. [22][23][24] The proposed technique of doping metal into TiO 2 to activate self-cleaning properties under visible light is a novel approach to address this challenge. The introduction of Fe doping into nano-TiO 2 results in the incorporation of Fe 3+ F I G U R E 1 Field emission scanning electron microscope (FESEM) images of the samples: (A) undoped TiO 2 , (B) Fe 0.01 -doped TiO 2 , (C) Fe 0.02 -doped TiO 2 , (D) Fe 0.03 -doped TiO 2 , (E) Fe 0.04 -doped TiO 2 at magnification ×100 000. ions within the crystal lattice of TiO 2 .…”

“…Currently, scientists are working toward activating the self‐cleaning ability of nanomaterials under visible light, which remains a significant challenge. Doping or co‐doping of metals or nonmetals into TiO 2 can modify its band gap, leading to the development of a more efficient photocatalyst that can respond to visible light 22–24 . The proposed technique of doping metal into TiO 2 to activate self‐cleaning properties under visible light is a novel approach to address this challenge.…”

Investigation on copper–nickel co-doped anatase titania nanospheres as an efficient material for photocatalytic and photovoltaic applications

“…Some of the earlier works are based on Cu and Ni with other metals/non-metals doped with TiO 2 and the efficiency of DSSCs is found to be 2.30%, 9.05%, 11.70% and 0.76% for Fe-Cu/TiO 2 , 40 Cu-S/TiO 2 , 41 Cu-N/TiO 2 , 42 Ni-Zn/ TiO 2 3 and Ni-N/TiO 2 . 43 Similarly, dyes such as methyl orange, methylene blue and Congo-red dye can be degraded by Cu-Zn/ TiO 2 , 44 Cu-Fe/TiO 2 45 and Ni-N/TiO 2 , 46,47 respectively.…”

Development of photocatalysts based on TiO2 films with embedded Ag nanoparticles

“…), heterojunctions with other semiconductors, and metal ion implantation. [15][16][17][18][19] It has been shown that the addition of metal nanoparticles improves the photocatalytic efficiency under different operating conditions by several possible mechanisms. 12 Different techniques have been considered for the deposition of TiO 2 onto surfaces as thin films 20,21 being the Sol-Gel techniques one of them.…”

“…To improve the photoactivity and photo‐response in the visible region of TiO 2 , different strategies have been used such as surface modification, noble metal deposition, doping with impurity elements, attach photosensitizer species (CdS, WO 3 , etc. ), heterojunctions with other semiconductors, and metal ion implantation 15–19 . It has been shown that the addition of metal nanoparticles improves the photocatalytic efficiency under different operating conditions by several possible mechanisms 12 .…”