surangkana wannapop

Heterostructure Pt/Bi2MoO6nanocomposites containing different weight contents of Pt nanoparti-cles were successfully synthesized by an effective microwave-assisted deposition method. Theeffect of Pt contents loaded on the Bi2MoO6nanoplates was investigated through the photodegra-dation of rhodamine B (RhB) illuminated by visible radiation. Face-centered cubic (FCC) metallicPt nanoparticles were supported on the surface of orthorhombic Bi2MoO6nanoplates with verygood distribution by a microwave-assisted deposition method. The photocatalytic performance ofBi2MoO6nanoplates was increased with increasing the loaded Pt nanoparticles from 1% to 10%.Upon further increasing the loaded Pt nanoparticles to 15%, the photocatalytic performance forthe degradation of RhB was significantly reduced. In this research, 10% Pt/Bi2MoO6nanocom-posites have the highest photocatalytic activity because Pt nanoparticles are very good electricalconductors that play the role of enhancing photocatalytic reaction rate.

Z-scheme plasmonic photocatalytic Ag/AgBr/Bi2MoO6 nanocomposites were synthesized by precipitation deposition method and followed by sonochemical deposition method. Phase, morphology, chemical structure, surface area and optical properties of the products were characterized by different techniques. The analytical results reveal that the Z-scheme plasmonic nanocomposites were the co-existence of AgBr, Ag/AgBr and Bi2MoO6 to form heterostructure AgBr/Bi2MoO6 and Ag/AgBr/Bi2MoO6 nanocomposites. The surface of Bi2MoO6 nanoplates were fully covered with 10–15 nm spherical AgBr and Ag/AgBr nanoparticles. The DRS spectra were excellent absorption of visible light with absorption edges of 457 nm, 470 nm and 484 nm for Bi2MoO6, AgBr/Bi2MoO6 and Ag/AgBr/Bi2MoO6 nanocomposites, respectively. The visible-light harvest of Ag/AgBr/Bi2MoO6 nanocomposites was the highest due to the synergistic effect of Z-scheme Ag/AgBr/Bi2MoO6 heterojunctions and surface plasmon resonance (SPR) effect of metallic Ag nanoparticles. The photocatalytic activities were investigated through the photodegradation of rhodamine B (RhB) under visible radiation (λ ≥ 420 nm). Among the three different photocatalysts, Ag/AgBr/Bi2MoO6 nanocomposites have the highest decolorization efficiency of 97.37% within 80 min because of the formation of Z-scheme Ag/AgBr/Bi2MoO6 nanocomposites and excellent visible-light harvest.

Bi2WO6 synthesized by hydrothermal method and heterostructure 1-10wt% Pt/Bi2WO6 nanocomposites synthesized by Sono chemical-assisted deposition method were studied for photocatalysis. The as-synthesized samples were characterized by X-Ray Diffraction (XRD), Fourier Transform InfraRed (FT-IR) spectroscopy, Raman spectrometry, X-ray Photoelectron Spectroscopy (XPS), Transmission Electron Microscopy (TEM) and UV-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS). The analytical results certified that metallic Pt nanoparticles were loaded on orthorhombic Bi2WO6 thin nanoplates and the visible light absorption of the nanocomposites was improved. The photocatalytic activities of the as-synthesized samples in degrading Rhodamine B (RhB) were investigated under visible light for 180 min. The photodegradation efficiencies were 35.33%, 66.18%, 86.91%, and 94.58% for 0%, 1%, 5%, and 10% Pt/Bi2WO6 samples, respectively. The 10% Pt/Bi2WO6 nanocomposites have the highest photocatalytic activity because the Pt nanoparticles have the highest activity in harvesting visible light and the strongest Surface Plasmon Resonance (SPR) effect. A possible mechanism for photocatalysis, main active radicals of the photodegradation process, and recyclability of the heterostructure Pt/Bi2WO6 nanocomposites were also investigated in this research.