Photocatalytic activity of TiO2 doped with boron and vanadium

Bettinelli, Marco; Dallacasa, V.; Falcomer, Daniele; Fornasiero, Paolo; Gombac, Valentina; Montini, Tiziano; Romano, Lucia; Speghini, Adolfo

doi:10.1016/j.jhazmat.2007.04.053

Cited by 174 publications

(107 citation statements)

References 48 publications

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“…According to Bettinelli et al [21], boron used as a titania dopant could favor the transformation of anatase to rutile. On the other hand, Finazzi et al [26] reported that B atoms in the anatase crystal could occupy different positions and promote changes in the electronic structure of boron-doped TiO 2 that is in accordance to the results of density functional theory. In general, previous results on borondoped titania nanoparticles suggest that preparation method highly impacts on material properties, but simultaneous decrease of bandgap energy value is not always observed.…”

Section: Introductionsupporting

confidence: 72%

Optimization of boron-doping process of titania nanotubes via electrochemical method toward enhanced photoactivity

Szkoda

Lisowska-Oleksiak

Siuzdak

2016

J Solid State Electrochem

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In this work, we were focused on the development of the electrochemical approach resulting in a stable boron doping of titania nanotubes. The doping procedure concerns anodic polarization of as-anodized titania in a H 3 BO 3 solution acting as n boron precursor. The series of attempts were taken in order to elaborate the most beneficial doping conditions. The parameters of electrochemical doping allowing to obtain boron-doped titania characterized by the highest photoconversion efficiency are as follows: reaction voltage 1.8 V, process duration 0.5 h, and the concentration of boric acid 0.5 M. Spectroscopy techniques such as UV-vis, X-ray diffraction, photoluminescence emission, and X-ray photoelectron spectroscopy were used to characterize the absorbance capability and the crystalline phase, to confirm the presence of boron atoms and to study the nature of chemical compounds, respectively. The well-ordered structure of titania and resistance of its morphology toward electrochemical treatment in H 3 BO 3 were confirmed by scanning electron microscopy images. However, cyclic voltammetry and electrochemical impedance spectroscopy studies showed the significant difference in conductivity and capacitance between doped and pristine titania. Moreover, the photocurrent densities of the B-doped sample were about seven times higher in comparison with those generated by the pure titania nanotube electrode.

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Section: Introductionsupporting

confidence: 72%

Optimization of boron-doping process of titania nanotubes via electrochemical method toward enhanced photoactivity

Szkoda

Lisowska-Oleksiak

Siuzdak

2016

J Solid State Electrochem

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“…Both strategies have already been followed and conductivity as high as 1 S cm -1 has been reached [24], noteworthy most of the time at the expense of the specific surface area. Different cations such as Nb, V or Ta [24][25][26][27][28][29][30] have already been used as dopant in TiO 2 .…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Doped TiO 2 aerogels as alternative catalyst supports for proton exchange membrane fuel cells: A comparative study of Nb, V and Ta dopants

Beauger

Testut

Berthon‐Fabry

et al. 2016

Microporous and Mesoporous Materials

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Nb, Ta and V-doped TiO 2 aerogels and xerogels have been synthesized as possible new alternatives to carbon blacks for Proton Exchange Membrane Fuel Cells catalyst supports. A comparative study of different dopants was realized in a single study. Nb, Ta and V showed different behaviors with respect to the final material structure and morphology, composition and electronic conductivity. They are all prone to surface segregation, to different extents. V-doped TiO 2 apart, the rutile structure could only be obtained after calcination in a reducing atmosphere at 800 °C for Nb or Ta-doped TiO 2 . The electronic conductivity exhibited a maximum at 10 at.% for Nb and Ta, 5 at.% for V. Nb revealed to be the most appropriate dopant to increase the electronic conductivity of TiO 2 , followed by Ta and V.4 to 5 orders of magnitude were gained after Nb doping for xerogels conductivity to reach almost 0.1 S cm -1 . The role of point defects was discussed to account for phase transition and evolution of conductivity.

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“…Among transition metal ions, vanadium ion is attractive as dopant because it will generate an intermediate band so that absorption will happen in the visible region. Various methods have been selected to prepare V doped doped TiO 2 photocatalysts, such as a hydrothermal method [16], electro spinning technique [17], wet chemical method [14,18], sol-gel method [19,20], flame spray pyrolysis technique [21], and anodic oxidation [22].…”

Section: Introductionmentioning

confidence: 99%

Effect of V Dopant on Physicochemical Properties of Vanadium-Doped Anatase Synthesized via Simple Reflux Technique

2016

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Abstract. Mesoporous pure TiO 2 (M-TiO 2 ) and mesoporous-vanadium-doped TiO 2 (M-V-doped TiO 2 ) were successfully synthesized via a facile and simple reflux technique. The purpose of this research was to study the effect of vanadium dopant on the physicochemical properties of all materials obtained. Characterization of the prepared materials was carried out using X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) and N 2 -adsorptiondesorption analysis. The presence of Ti and O elements in M-TiO 2 and of Ti, V and O elements in M-V doped TiO 2 could be detected by SEM-EDS, while the patterns of X-ray diffraction of all the prepared samples had a well-crystalline surface of anatase type. All mesoporous vanadium-doped TiO 2 (M-V-doped TiO 2 ) materials performed in a highly transparent mode in the visible region at 554 nm (E g = 2.24 eV) and 588 nm (E g = 2.12 eV) for 3.3 and 4.9 wt% V doped TiO 2, respectively. The Rietveld refinement method was applied to extract the structural parameters of the M-TiO 2 and M-V-doped TiO 2 using the Fullprof program in the WinPlotr package. The prepared materials were refined in the crystal system and space group of anatase (tetragonal, I4 1 /amd (141)). The vanadium ion was successfully doped into TiO 2 . The isotherm type of M-TiO 2 and 2.3 wt% V doped TiO 2 were of type IV, with a profile of type H2 hysteresis loops, while the 3.3 and 4.9 wt% vanadium-doped TiO 2 reflected isotherm type III. The Brunauer-Emmett-Teller (BET) results showed a significant reduction in surface area due to increased concentrations of vanadium. The highest values of BET-specific surface area, pore volume and average pore size of M-TiO 2 were 46 m 2 /g, 18.45 nm and 0.2572 cm 3 /g respectively.

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Photocatalytic activity of TiO2 doped with boron and vanadium

Cited by 174 publications

References 48 publications

Optimization of boron-doping process of titania nanotubes via electrochemical method toward enhanced photoactivity

Optimization of boron-doping process of titania nanotubes via electrochemical method toward enhanced photoactivity

Doped TiO 2 aerogels as alternative catalyst supports for proton exchange membrane fuel cells: A comparative study of Nb, V and Ta dopants

Effect of V Dopant on Physicochemical Properties of Vanadium-Doped Anatase Synthesized via Simple Reflux Technique

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