Tailoring titanium dioxide by silver particles for photocatalysis

Ibukun, Olaniyan; Jeong, Hae Kyung

doi:10.1016/j.cap.2019.10.009

Cited by 17 publications

(7 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To overcome this problem, TiO 2 must be doped with another narrow band gap photocatalyst, or the small band gap photocatalyst should be used alone in order to react effectively under visible light. There are photocatalysts with tunable band gaps that can be used, such as ZnO, 27 Cu 2 O, 28 Ag, 29 Bi 2 O 3 , 30 carbon nanotubes, 31 and others.…”

Section: Photocatalytic Membranementioning

confidence: 99%

Immobilization techniques of a photocatalyst into and onto a polymer membrane for photocatalytic activity

et al. 2021

View full text Add to dashboard Cite

show abstract

Section: Photocatalytic Membranementioning

confidence: 99%

Immobilization techniques of a photocatalyst into and onto a polymer membrane for photocatalytic activity

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Titanium dioxide is a semiconductor material with excellent light transmission, high refractive index, and good dielectric properties [1]. Because it is not harmful to the environment and humans, it has been widely studied, but more importantly, it is used in various fields, such as medicine, cosmetics, optics [2], the packaging industry, as well as pigments in paints, inks, and coatings [3], photocatalysts, and as an antibacterial agent [4].…”

Section: Introductionmentioning

confidence: 99%

“…In general, TiO 2 NPs are an important semiconductor material with a large specific surface area and special chemical properties such as easy control, limited cost, nontoxicity, and resistance [5]. They are the best photocatalytic and microbial agents because of their environmental friendliness, low cost, high oxidative capacity, and chemical and thermal safety against photocorrosion [4].…”

Section: Introductionmentioning

confidence: 99%

“…The main mechanism of heterogeneous photocatalysis is based on the illumination of the photocatalyst (TiO 2 NPs) with the light of appropriate wavelength, with an energy that is equal to or greater than the bandgap, giving rise to the creation of electron/hole (e-/h+) pairs at the conduction (CB) and valence bands (VB), respectively. The photogenerated charges can react with the adsorbed H 2 O (OH-) and O 2 molecules on the semiconductor surface where it participates in redox reactions to form OH•-and O 2 •radicals, which are the active species in the photodegradation process, for removing organic contaminants by converting them into CO 2 , H 2 O, and inorganic ions [4,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phytosynthesis of TiO2 Nanoparticles Using E. crassipes Leaf Extracts, Their Photocatalytic Evaluation and Microbicide Effect

Velázquez-Hernández

García-Rivas

Martínez-Gallegos

et al. 2022

International Journal of Photoenergy

View full text Add to dashboard Cite

In the present research work, the photocatalytic and microbicidal activities of titanium nanoparticles (TiO2 NPs) were evaluated. TiO2 NPs were obtained through the phytosynthesis process, using Eichhornia crassipes leaf extract. In order to determine whether particle size improves photocatalytic and microbicidal activities, the pH of the photosynthesized was modified to 12, 7, and 4. The TiO2 NPs modified were characterized by UV-Vis spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), and high-resolution transmission electron microscopy (HR-TEM) to reveal the crystalline and morphological nature of the phytosynthesized TiO2 NPs. UV-Vis analysis revealed that the wavelength for the TiO2 NPs was 327 nm, while FT-IR confirmed the presence of TiO2 NPs at peaks located between 536 and 532 cm-1. Finally, HR-TEM analysis showed that all nanoparticles had a TiO2 composition and a particle size ranging from 25 to 35 nm. For the photocatalytic and microbicidal tests, three concentrations of nanoparticles were used (100, 50, and 10 mg/L), and the results showed that TiO2 nanoparticles at a concentration of 10 mg·L-1 demonstrated excellent photocatalytic activity in photodegrading phenol [10 mg·L-1] up to 98.7%, while their microbicidal activity was more effective in contact with S. aureus than with E. coli, using a TiO2 NPs concentration of 100 mg·L-1.

show abstract

“…Thus, it is very common to find examples of applications of noble or rare metals (Ag-, Au-, Pt-, Ir-, etc.) that are doped onto or composited with different materials to produce highly efficient photocatalysts (Cao et al, 2020;Ibukun and Jeong, 2020;Meng et al, 2020;Xu et al, 2020) that may not be either sustainable or economically viable for most technological applications. Besides, the use of nanoparticles as catalysts is quite extended as the surface area increases when the particle size decreases, with the subsequent effect on efficiency for surface-based processes (Retamoso et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Mechanical Stability Is Key for Large-Scale Implementation of Photocatalytic Surface-Attached Film Technologies in Water Treatment

et al. 2021

View full text Add to dashboard Cite

Replacement of classical tertiary water treatment by chemical-free sunlight-driven photocatalytic units has been often proposed. Photocatalysts are required to be cost-effective, inert, chemically stable, reusable, and easy to separate and also that they are mechanically stable. The effect of mechanical stress on a photoactive TiO2 layer, and on its effectivity for degradation of phenol as a model pollutant, has been studied during photocatalytic water treatment using NUV–vis light. Sol–gel (SG) and liquid phase deposition (LPD) methods have been used to coat spherical glass beads with the photocatalyst (TiO2). Physicochemical characterization of coated glass beads has been performed by N2 adsorption–desorption isotherms, SEM, EDXS, and AFM. Phenol photocatalyzed degradation was carried out both in stirred batch and flow reactors irradiated with a medium-pressure Hg-vapor lamp (λ > 350 nm). Phenol concentration was determined by HPLC, and its photoproducts were identified using HPLC/MS. In the stirred batch reactor, all LPD-coated glass beads displayed higher catalytic activity than SG-coated ones, which increased with calcination temperature, 700°C being the most efficient temperature. Preliminary etching of the glass beads surface yielded dissimilar results; whereas, phenol photodegradation with SG-coated etched glass beads is twice faster than with unetched SG ones, the rate reduces to one-third using LPD etched instead of unetched LPD glass beads. Phenol photodegradation using LPD is similar both in stirred batch and flow reactors, despite the latter uses a lower catalyst load. LPD-etched catalyst was recovered and reused in the stirred batch reactor; its activity reduced sharply after the first use, and it also lost activity in successive runs, ca. 10% of activity after each “use and recover” cycle. In the flow reactor, activity loss after the first experiment and recycling (ca. 30%) was much larger than in the following runs, where the activity remained rather constant through several cycles. LPD is more adequate than SG for TiO2 immobilization onto glass beads, and their calcination at 700°C leads to relatively strong and reactive photocatalytic films. Still, TiO2-coated glass beads exhibited very low photoactivity compared to TiO2-P25 nanoparticles, though their separation is much easier and almost costless. The durability of the catalytic layer increases when using a flow reactor, with the pollutant solution flowing in a laminar regime through the photocatalyst bed. In this way, the abrasion of the photocatalytic surface is largely reduced and its photoactivity is better maintained.

show abstract

Tailoring titanium dioxide by silver particles for photocatalysis

Cited by 17 publications

References 47 publications

Immobilization techniques of a photocatalyst into and onto a polymer membrane for photocatalytic activity

Immobilization techniques of a photocatalyst into and onto a polymer membrane for photocatalytic activity

Phytosynthesis of TiO2 Nanoparticles Using E. crassipes Leaf Extracts, Their Photocatalytic Evaluation and Microbicide Effect

Mechanical Stability Is Key for Large-Scale Implementation of Photocatalytic Surface-Attached Film Technologies in Water Treatment

Contact Info

Product

Resources

About