Preparation of Ag‐Modified (B,P)‐Codoped TiO₂ Hollow Spheres with Enhanced Photocatalytic Activity

Abstract

A series of TiO 2 hollow sphere catalysts with or without nonmetal (B,P) dopants and Ag-modification were prepared through a sol-gel process with styrene-methyl methacrylate copolymer (PSMMA) microspheres as the template. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), laser Raman spectroscopy (LRS), and UV/Vis diffuse reflectance spectroscopy (UV/Vis DRS), and their photocatalytic activities were evaluated by degradation of[a] Guangxi Key 1142 methylene blue (MB). Both B and P dopants could narrow the band gap of the TiO 2 catalyst, and the loaded Ag only played the role of photoelectron transmitter. The two effects of the nonmetal dopants and the loaded Ag improved the photocatalytic activity of the TiO 2 hollow spheres. Moreover, the hollow sphere structure and oxygen vacancies were beneficial to photocatalysis. Among all the catalysts prepared, Ag-modified (B,P)-codoped TiO 2 hollow spheres exhibited the highest photocatalytic activity.

Synthesis of (Ag,F)-modified anatase TiO2 nanosheets and their enhanced photocatalytic activity

“…For the samples with different AgNO 3 amounts, the degradation rate gradually increases along with the increase of AgNO 3 , and reaches a maximum at 0.03298 min À1 (TS2F10). In accordance with the literature and our previous work, 14,15,37 the loaded Ag plays the role of a photogenerated-electron transmitter owing to the LSPR effect of Ag nanoparticles. The electron-transmitting effect of Ag delays the charge-carrier recombination and promotes the interfacial charge-transfer rate of the photogenerated carriers, which significantly enhances the photocatalytic activity.…”

Vacuum‐Treated Mo,S‐Doped TiO2:Gd Mesoporous Nanospheres: An Improved Visible‐Light Photocatalyst

“…Moreover, the photocatalytic degradation efficiency of titania could be further improved by codoping or multielements doping, which mainly involves nonmetal-nonmetal [21,22] and metal-nonmetal codoping. [23][24][25] Codoping can result in synergies to reflect the different roles of the multielements, for instance, expanding the visible-light response and minimizing recombination.…”

Silver-Doped Titanium Oxide Layers for Improved Photocatalytic Activity and Antibacterial Properties of Titanium Implants

“…Doping titanium oxides with beneficial chemistries has been shown to alter the PCA and antimicrobial responses [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. Phosphorus doping has been shown to increase the PCA of anatase or mixed phase oxides when compared to non-phosphorus-containing titanium oxide counterparts [ 31 , 32 ].…”

“…Both anatase phase and mixed anatase and rutile phase phosphorus-doped oxides exhibited approximately 50% killing efficacy against Streptococcus sanguinis following a 15 min pre-illumination with a 365 nm UVA light [ 3 ]. Silver-doped anatase phase oxide spheres have also been shown to exhibit higher PCA compared to undoped control oxide spheres [ 30 ]. Titanium oxide nanotubes with deposited silver nanoparticles showed significantly reduced numbers of attached S. sanguinis and Lactobacillus salivarius compared to anodized titanium controls and unmodified titanium [ 33 ].…”