Energy level matching for efficient charge transfer in Ag doped - Ag modified TiO2 for enhanced visible light photocatalytic activity

Nanaji, Katchala; Janardhana, Reddy Kunda Siri Kiran; Rao, Tata Narsinga; Anandan, Sambandam

doi:10.1016/j.jallcom.2019.04.283

Cited by 46 publications

(14 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Presently, the antibacterial mechanism of 316L SS is mainly based on the dissolution of Ag, Cu, or Zn ions [9][10][11][12], which is limited by several factors such as the safe range of ion concentration, competition between rates of ion dissolution and bacterial proliferation and the antibacterial period [13][14][15][16]. Photocatalysis is a highly efficient and inexpensive technique to inhibit and kill the bacteria [17][18][19][20]. It is based on the photochemical properties of semiconductor photocatalyst to generate reactive oxygen species (ROS), superoxide anion (O À 2 ) radicals under external energy such as the natural energy of sunlight [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…However, it is still restricted by the large band gap structure and very high recombination rate of photogenerated electron-hole pairs [25]. Coupling TiO 2 with Ag nanoparticle (TiO 2 @Ag) is an efficient way to improve its photocatalytic property under visible light [19,26,27]. It is well known that the photocatalytic activity depends on the utilization of light energy as well as on the separation of photogenerated electrons and holes [28].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Antibacterial properties of Ag/TiO2/PDA nanofilm on anodized 316L stainless steel substrate under illumination by a normal flashlight

Liu

et al. 2020

J Mater Sci

View full text Add to dashboard Cite

The demand of medical materials for rapid and efficient elimination of bacteria has seen a dramatic surge over the past few years. In this study, antibacterial nanofilms with reactive oxygen species were generated by photocatalysis. To prepare these nanofilms, Ag and amorphous TiO 2 nanoparticles decorated on polydopamine (PDA) were coated on three-dimensional (3D) nanopore arrays, which was fabricated on a substrate of anodized stainless steel. All the antibacterial tests were conducted with a household flashlight, which may be considered as a practical approach for antibacterial materials. The photoelectrochemical property of the 3D Ag/TiO 2 /PDA nanofilm on 316L stainless steel (Ag/TiO 2 /PDA SS) was about 15 times higher than that of the annealed Ag/ TiO 2 /PDA SS, and consequently, it exhibited higher antibacterial activity. The enhanced photoelectrochemical property is attributed to the successful separation of electrons (amorphous TiO 2 ) and holes (Ag nanoparticles). Further, when a plate containing 3D Ag/TiO 2 /PDA SS was irradiated with visible light just for 10 min, it immediately destroyed the bacteria in 10 6 CFU/mL without any bacterial colony. After five weeks, there were still no bacterial colonies in the plate corresponding to Ag/TiO 2 /PDA SS under visible light, while Ag/TiO 2 / PDA SS in dark had a negligible effect on the bacteria, i.e., the antibacterial mechanism through direct contact and ion dissolution was not efficient. The excellent antibacterial properties of 3D Ag/TiO 2 /PDA SS illuminated by flashlight provides an efficient, facile, and cost-effective technique for the development of antibacterial medical materials to meet the increasing demand of eliminating bacterial infections.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Antibacterial properties of Ag/TiO2/PDA nanofilm on anodized 316L stainless steel substrate under illumination by a normal flashlight

Liu

et al. 2020

J Mater Sci

View full text Add to dashboard Cite

show abstract

“…It was confirmed by spin-polarized density functional theory (DFT) that the substitutional Ag doped at Ti sites introduced Ag 4d states above the valence-band maximum, which might help in shifting visible-light excited electrons to the conduction band of TiO 2 [14]. The photo-induced electrons excited to the dopant Ag 4d states could be further transferred to the surface states of Ag and subsequently consumed for the reduction of oxygen via the multi-electron reduction, thus resulting in an enhancement in the photocatalytic activity of TiO 2 [15]. In addition, the oxy radicals were produced from the Ag doped TiO 2 under visible light illumination and participated in oxidation reactions to decompose organic components [16].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Properties of PET Filaments Coated with Ag-N Co-Doped TiO2 Nanoparticles Sensitized with Disperse Blue Dyes

et al. 2020

View full text Add to dashboard Cite

In this study, the effects of disperse blue dye-sensitization on the photocatalytic properties of the Ag-N co-doped TiO2 nanoparticles loaded on polyethylene terephthalate (PET) filaments are investigated under visible light irradiation. The microstructure and photocatalytic properties of the as-synthesized TiO2 nanocomposites, as well as the as-prepared PET filaments, are systematically characterized. The photocatalytic performance of the PET filaments coated with the Ag-N co-doped TiO2 nanoparticles sensitized with disperse blue dyes is evaluated via its capacity of photo-degrading methyl orange (MO) dyes under visible light irradiation. It is found that the holes are the predominant reactive radical species and the hydroxyl and superoxide radicals play a subordinate role in the photocatalytic reaction process. The reaction rate constant of the photocatalytic composite filaments is nearly 4.0 times higher than that of the PET filaments loaded solely with TiO2 nanoparticles. The resultant photocatalytic composite filaments are evident to be capable of repeatedly photo-degrading MO dyes without losing its photocatalytic activity significantly.

show abstract

“…Photocatalysis is known as a green method, especially for a series of environmental applications like the removal of organic dyes from the wastewater. In this method, semiconducting photocatalysts, such as TiO 2 , ZnO, SnO 2 and SrTiO 3 , can produce reactive and oxidizing free radicals from the oxygen and the water by means of UV light, which succeed in a high degradation for organic dye pollutants [9,10]. The specified photocatalysts have many advantages such as high photocatalytic activity, stability in aqueous medium, low cost and reusability.…”

Section: Introductionmentioning

confidence: 99%

“…Photoinduced electrons in the conduction band and photoinduced holes in the valence band possess high reduction power and oxidation power, respectively. The presence and the amount of the photoexcited charge carriers are significant prerequisites to realize the photocatalysis successfully [9]. In literature, metal ions possessing similar properties to elements of the photocatalyst have been studied since they are able to substitute elements in the photocatalyst during the doping process [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Iron Doping on Photocatalytic Activity of Boron Oxide Processed Using Polyvinyl Borate Precursor

Köysüren

2019

Journal of Boron

View full text Add to dashboard Cite

In this study, boron oxide (B 2 O 3 ) powder has been synthesized by the pyrolysis of polyvinyl borate precursor in air. For this purpose, polyvinyl borate precursor was synthesized through the condensation reaction of polyvinyl alcohol and boric acid, and then the polymeric precursor was pyrolyzed at 500°C. The as-prepared B 2 O 3 particles were doped with iron (Fe) ions using the wet impregnation method. The photocatalytic activity of both undoped B 2 O 3 and iron doped B 2 O 3 (Fe-B 2 O 3 ) powders was studied by investigating the degradation of the model dye, methylene blue, under UV light irradiation. It was pointed out that iron doped B 2 O 3 powder exhibited enhanced photocatalytic activity compared to undoped one. In addition, various techniques of characterization such as FTIR, XRD, FESEM, EDX and UV-Vis spectroscopy were performed to confirm the synthesis of B 2 O 3 particles and the presence of iron ions in the crystal structure of the prepared photocatalyst. The novelty of this study was to research the photocatalytic performance of both B 2 O 3 and Fe-B 2 O 3 photocatalysts.

show abstract

Energy level matching for efficient charge transfer in Ag doped - Ag modified TiO2 for enhanced visible light photocatalytic activity

Cited by 46 publications

References 68 publications

Antibacterial properties of Ag/TiO2/PDA nanofilm on anodized 316L stainless steel substrate under illumination by a normal flashlight

Antibacterial properties of Ag/TiO2/PDA nanofilm on anodized 316L stainless steel substrate under illumination by a normal flashlight

Enhanced Photocatalytic Properties of PET Filaments Coated with Ag-N Co-Doped TiO2 Nanoparticles Sensitized with Disperse Blue Dyes

Effect of Iron Doping on Photocatalytic Activity of Boron Oxide Processed Using Polyvinyl Borate Precursor

Contact Info

Product

Resources

About