A Novel Method To Prepare B/N Codoped Anatase TiO₂

Abstract

Abstract：B/N co-doping is an effective way to narrow the band gap of TiO 2 to enhance the photocatalytic activity. However, traditional doping method using ammonia as N source is still unsatisfactory because of its safety risks and high cost. In this work, a benign and cost-effective method has been developed to prepare the B/N co-doped TiO 2 . First, we use TiB 2 as the raw material to prepare B-doped TiO 2 via a hydrothermal method followed by heat treatment. Then the B/N co-doped TiO 2 can be simply produced by annealing the mixture of the as-prepared B-doped TiO 2 and urea.X-ray diffraction (XRD) and scanning electron microscopy (SEM) results show that the samples present anatase structure and spherical morphology. X-ray photoelectron spectroscopy (XPS) analysis indicates that B and N atoms exist not only on the surface but also in the bulk. Moreover, the content of N atoms decreases with the depth in the sample while Ti 3+ content gradually increases with the depth. UV-vis absorption spectrum shows an extension of light absorption into the full visible region.More importantly, the B/N co-doped TiO 2 exhibits promoted photocatalytic activity under both UV and visible light than the B-doped TiO 2 .

Photocatalysis with Reduced TiO2: From Black TiO2 to Cocatalyst-Free Hydrogen Production

“…Red TiO 2 was found to absorb the full visible light spectrum and exhibited an optical E g that varied from ∼1.9 eV on the surface to 3.2 eV in the core, as a consequence of the introduced boron concentration gradient. 19,20 Interestingly, the finding did not generate follow-up work in photocatalysis.…”

BiVO4‐TiO2 Composite Photocatalysts for Dye Degradation Formed Using the SILAR Method

“…However,t he activity of TiO 2 is hindered by two factors:awide band gap, which restricts its activity to only UV light, and fast charge recombination leading to few surfacer eactions occurring. Much work hasb een devoted to overcoming both these problemsi ncluding tuning the nanostructure of TiO 2 itself, [8][9][10] doping with non-metals, [11][12][13] metals [14] andc ombinations of two [15][16][17] or even more [18] dopants, introductiono fp lasmonic metal nanoparticles [19,20] and formation of nanocomposites with conductive organic nanomaterials. [21,22] Furthermore, two or more of these methods are often combined to produce high activity photocatalysts.…”

Facile synthesis of S-doped reduced TiO 2- x with enhanced visible-light photocatalytic performance

“…Nonmetal-doped TiO2 has received much attention because the incorporation of nonmetals into TiO2 can extend its photoresponse from the ultraviolet (UV) to the visible region [5][6][7][8]. The introduction of doping agents as anions or cations to substitute Ti or/and O in the lattice of TiO2 could narrow the TiO2 electronic band gap or create localized electronic states in the band gap, which could improve its visible-light absorption and result in high visible-light photocatalytic activity.…”