Preparation of thermally stable anatase TiO2 photocatalyst from TiOF2 precursor and its photocatalytic activity

Lv, Kangle; Wang, Yuanyuan; Cui, Longzhe; Chen, Shulin; Li, Mei

doi:10.1016/j.jallcom.2011.01.103

Cited by 94 publications

(51 citation statements)

References 46 publications

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“…In Figure 2a,b, TiOF2 crystals displayed a mixture of the cubic image which is accords with the cubic image in [7][8][9][10][11][12][13][14][15][16][17][18]. Each individual particle crystal is about 50-300 nm and tends to aggregate, forming larger particles while-in Figure 2c,d-the NaOH-modified TiOF2 displayed a more complex network shape with network units in about 100 nm.…”

Section: Phase Structures and Morphologysupporting

confidence: 71%

“…Thus, studies on changing morphology [1][2][3], modification [1,4,5], and other methods were conducted to decrease its band gap or inhibit its electron-hole recombination. The discovery of non-titanium semiconductor photocatalysts with a narrow intrinsic energy band gap, efficiently driven by visible light, may also attract much attention [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Only a few studies focused on the photocatalytic activity of TiOF2 have been reported [7][8][9]. As usual, TiOF2 nanoparticles were synthesized via hydrothermal [10,[14][15][16][17][18] and solvothermal [7,11,12] methods from titanium (IV) isopropoxide (TIP), and have a cubic shape [7][8][9][10][11][12][13][14][15][16][17][18]. The size of TiOF2 nanocubes could be affected by alcoholysis time, alcohol kind, solvothermal temperature, different H2O production rate and amount [7,17].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of NaOH-Modified TiOF2 and Its Enhanced Visible Light Photocatalytic Performance on RhB

2017

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NaOH-modified TiOF 2 was successfully prepared using a modified low-temperature hydrothermal method. Scanning electron microscopy shows that NaOH-modified TiOF 2 displayed a complex network shape with network units of about 100 nm. The structures of NaOH-modified TiOF 2 have not been reported elsewhere. The network shape permits the NaOH-modified TiOF 2 a S BET of 36 m 2 ·g −1 and a pore diameter around 49 nm. X-ray diffraction characterization shows that TiOF 2 and NaOH-modified TiOF 2 are crystallized with a pure changed cubic phase which accords with the SEM results. Fourier transform infrared spectroscopy characterization shows that NaOH-modified TiOF 2 has more O-H groups to supply more lone electron pairs to transfer from O of O-H to Ti and O of TiOF 2 . UV-vis diffuse reflectance spectroscopy (DRS) shows that the NaOH-modified TiOF 2 sample has an adsorption plateau rising from 400 to 600 nm in comparison with TiOF 2 , and its band gap is 2.62 eV, lower than that of TiOF 2 . Due to the lower band gap, more O-H groups adsorption, network morphologies with larger surface area, and sensitization progress, the NaOH-modified TiOF 2 exhibited much higher photocatalytic activity for Rhodamine B (RhB) degradation. In addition, considering the sensitization progress, O-H groups on TiOF 2 not only accelerated the degradation rate of RhB, but also changed its degradation path. As a result, the NaOH-modified TiOF 2 exhibited much higher photocatalytic activity for RhB degradation than the TiOF 2 in references under visible light. This finding provides a new idea to enhance the photocatalytic performance by NaOH modification of the surface of TiOF 2 .

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Section: Phase Structures and Morphologysupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of NaOH-Modified TiOF2 and Its Enhanced Visible Light Photocatalytic Performance on RhB

2017

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“…Uniform ammonium oxofluorotitanate (NH 4 TiOF 3 ) mesocrystals and their conversion to mesocrystals of TiO 2 were described [18][19][20]. Titanium oxyfluoride TiOF 2 was synthesized for obtaining of thermally stable TiO 2 of high photocatalytic activity [21] and for its use as anode material for lithium-ion battery [22]. The synthesis of the above precursors from natural ilmenite and investigation of their physicochemical properties is the aim of present paper.…”

Section: Introductionmentioning

confidence: 99%

Fluoride Processing of Titanium-Containing Minerals

Laptash¹,

Maslennikova²

2012

AMPC

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Fluoride processing of natural ilmenite with the use of ammonium hydrogen difluoride (NH 4 HF 2 ) as an effective fluorinating agent is suggested. Chemistry, composition, structure, thermal and hydrolytic properties of fluorination products were investigated. Ammonium fluoro-and oxofluorotitanates are suitable for preparing of titanium dioxide as pigmentary product or as doped by nitrogen and fluorine.

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“…Titanium dioxide (TiO 2 titania) is an n-type oxide semiconductor that shows photocatalytic activity and photoconductivity [1,2]. Several various applications of TiO 2 particles have been studied in recent years, as photocatalysts and to solar cells, UV-shielding materials and electric devices [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Titanium Oxide Nanoparticles Obtained by Hydrolysis Reaction of Ethylene Glycol Solution of Alkoxide

Uekawa

Endo

Ishii

et al. 2012

Journal of Nanotechnology

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Transparent and stable sols of titanium oxide nanoparticles were obtained by heating a mixture of ethylene glycol solution of titanium tetraisopropoxide (TIP) and a NH 3 aqueous solution at 368 K for 24 h. The concentration of NH 3 aqueous solution affected the structure of the obtained titanium oxide nanoparticles. For NH 3 aqueous solution concentrations higher than 0.2 mol/L, a mixture of anatase TiO 2 nanoparticles and layered titanic acid nanoparticles was obtained. The obtained sol was very stable without formation of aggregated precipitates and gels. Coordination of ethylene glycol to Ti 4+ ions inhibited the rapid hydrolysis reaction and aggregation of the obtained nanoparticles. The obtained titanium oxide nanoparticles had a large specific surface area: larger than 350 m 2 /g. The obtained titanium oxide nanoparticles showed an enhanced adsorption towards the cationic dye molecules. The selective adsorption corresponded to presence of layered titanic acid on the obtained anatase TiO 2 nanoparticles.

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Preparation of thermally stable anatase TiO2 photocatalyst from TiOF2 precursor and its photocatalytic activity

Cited by 94 publications

References 46 publications

Synthesis of NaOH-Modified TiOF2 and Its Enhanced Visible Light Photocatalytic Performance on RhB

Synthesis of NaOH-Modified TiOF2 and Its Enhanced Visible Light Photocatalytic Performance on RhB

Fluoride Processing of Titanium-Containing Minerals

Characterization of Titanium Oxide Nanoparticles Obtained by Hydrolysis Reaction of Ethylene Glycol Solution of Alkoxide

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