Laser-Induced Silver Nanoparticles on Titanium Oxide for Photocatalytic Degradation of Methylene Blue

Abstract

Silver nanoparticles doped on titanium oxide (TiO2) were produced by laser-liquid interaction of silver nitrate (AgNO3) in isopropanol. Characteristics of Ag/TiO2 (Ag doped TiO2) nanoparticles produced by the methods presented in this article were investigated by XRD, TEM, SEM, EDX, and UV-Vis. From the UV-Vis measurements, the absorption of visible light of the Ag/TiO2 photocatalysts was improved (additional absorption at longer wavelength in visible light region) obviously. The photocatalytic efficiency of Ag/TiO2 was tested by the degradation of methylene blue (MB) in aqueous solution. A maximum of 82.3% MB degradation is achieved by 2.0 wt% Ag/TiO2 photocatalyst under 2 h illumination with a halogen lamp.

Enhanced photocatalytic degradation of Safranin-O by heterogeneous nanoparticles for environmental applications

“…However, the UV-band means that the nanostructure Ag-TiO 2 still has the properties of pure TiO 2 nanoparticles. A similar spectral characteristic was also observed by Whang et al [26].…”

Photocatalytic degradation of methylene blue under visible light using PVP-capped ZnS and CdS nanoparticles

“…Since the most part of the solar energy is in the visible region, semiconductors with suitable band gap, flat band potential/energy levels and good adsorption properties in the visible region are more efficient in this aspect. CdS with a direct band gap of $2.4 eV is a promising material to absorb visible light and its photocatalytic activity may be improved by activating with ZnS that has higher negative redox potentials of excited electrons (Maji et al, 2011;Whang et al, 2009). Especially in nano-scale region, the reactivities of these materials are often enhanced due to size-dependent changes in their redox potentials and high density of active surface states for chemical reactions and photon absorption associated with high surface to volume ratio.…”

A Review on TiO2 Nanotubes: Influence of Anodization Parameters, Formation Mechanism, Properties, Corrosion Behavior, and Biomedical Applications

“…Among the various nanostructured oxide materials, special attention has been directed to TiO 2 nanotubes (TNT) due to its enhanced properties, cost-effective construction, and higher surface-to-volume ratio [6]. The TNT with high-specific surface area, ion-exchangeable ability, and photocatalytic property has been considered for various potential applications as catalyst in pool boiling [7], photocatalysis [8][9][10][11][12][13][14][15][16][17] [41,42], and especially in the biomedical field [43][44][45][46][47][48][49]. Figure 1 shows the above-mentioned applications schematically.…”