Effects of Ag⁰-modification and Fe³⁺-doping on the structural, optical and photocatalytic properties of TiO₂

Abstract

The reasons for the photocatalytic activity of 1% Ag–TiO2 > pure TiO2 > 1% Ag/1% FeTiO2 > 1% Fe–TiO2 are investigated systematically.

Investigation of photocatalytic activity of Ag‐rutile heterojunctions

“…XRD, TEM and XPS results testify that metallic Ag particles deposit on the rutile surface. Although high content of Ag addition can inhibit the recombination of photogenerated electrons and holes, it will cover the surface of rutile and hinder the absorption of light source and adsorption of RhB molecules, resulting in the decrease of photocatalytic activity [11, 22].…”

Fabrication, characterization and high photocatalytic activity of Ag–ZnO heterojunctions under UV-visible light

“…The decrease cannot be attributed to the formation of new recombination centers due to the addition of excess Ag because the PL peak intensity of 3%Ag-ZnO and 5%Ag-ZnO is still lower than that of 1%Ag-ZnO. It was conrmed that Ag particles are loaded on the ZnO surface and excess Ag particles will hinder the absorption of light, [51][52][53] thus causing a drop in the photocatalytic activity. Table 1 lists the photocatalytic performance data reported in literature.…”

Iron Modified Titanate Nanotube Arrays for Photoelectrochemical Removal of E. coli

“…Hence, we confirmed the state of Fe in Fe/TNAs is Fe 3+ instead of Fe 0 as the findings in Figure 3 c. Figure 3 d shows that O has a characteristic peak at 530 eV, which represents the formation of Ti or Fe oxides [ 43 ]. Figure 3 e shows that the characteristic peaks of Ti at 458 eV and 464 eV correspond to Ti 2p 3/2 and Ti 2p 1/2 respectively, confirming that Ti exists in the form of Ti 4+ [ 44 ]. Table 2 shows the element percentage of Fe/TNAs-0.2 and Fe/TNAs-0.5 by XPS analysis.…”