Highly Efficient Visible-Light-Induced Photocatalytic Activity of Nanostructured AgI/TiO₂ Photocatalyst

Abstract

Nanostructured AgI/TiO(2) photocatalyst was synthesized by a feasible approach with AgNO(3), LiI, and Ti(OBu)(4) and characterized by X-ray diffraction, transmission electron microscopy, angle-dependent X-ray photoelectron spectroscopy, diffusive reflectance UV-vis spectroscopy, Raman spectroscopy, photoluminescence, and the Brunauer-Emmett-Teller technique. The results of characterization reveal that the nanostructured AgI/TiO(2) has a novel core/shell/shell nanostructure of AgI/Ag-I(2)/TiO(2). Compared with TiO(2) (P25) supported AgI, the formation of the nanostructure results in substantial shifting of the absorption edge of AgI to red, enhancement of the absorption intensity, and the appearance of a strong tail absorption above 490 nm, which is assigned to the absorption of I(2) and Ag. Photocatalytic tests show that the nanostructured AgI/TiO(2) photocatalyst exhibited very high visible-light-induced photocatalytic activity for the photodegradation of crystal violet and 4-chlorophenol, which is 4 and 6 times higher than that of P25 titania supported AgI, respectively. The highly efficient visible-light-induced photocatalytic activity of the nanostructured AgI/TiO(2) is attributed to its strong absorption in the visible region and low recombination rate of the electron-hole pair due to the synergetic effect among the components of AgI, Ag, I(20, and TiO(2) in the nanostructured AgI/TiO(2).

Effect of calcination temperature on structural properties and photocatalytic activity of Mn-C-codoped TiO2

“…The PL emission spectra has been widely used to disclose the efficiency of charge carrier trapping, immigration, and transfer, and to understand the fate of electrons and holes in semiconductor since PL emission results from the recombination of free carriers [34][35][36][37] . Fig.…”

Enhanced Photodegradation of Toxic Pollutants on Plasmonic Au–Ag–AgI/Al2O3 Under Visible Irradiation

“…This results in an overall increase in charge circulation. The reduction potential of the CB of AgI is -0.15 V. Therefore, an electron in the CB of plasmon-induced metal NPs can reduce oxygen to O 2 •- [27]. ESR studies were performed with DMPO to determine O 2…”

Magnetically Separable Fe3O4/AgBr Hybrid Materials: Highly Efficient Photocatalytic Activity and Good Stability

“…Up to now, most of the silver oxide and silver halide have attracted much attention because of their strong visible light absorption performance [1][2][3][4][5][6][7]. Particularly, AgBr, which has a band gap of 2.6 eV, is well known as a photosensitive material and has been extensively applied to photographic films, which demonstrated excellent performance in degradation of dye pollutants and decomposition of water [8][9][10].…”