An ambient temperature aqueous sol–gel processing of efficient nanocrystalline doped TiO2-based photocatalysts for the degradation of organic pollutants

Malengreaux, Charline; Douven, Sigrid; Poelman, Dirk; Heinrichs, Benoı̂t; Bartlett, John R.

doi:10.1007/s10971-014-3405-6

Cited by 30 publications

(65 citation statements)

References 25 publications

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“…Scans were performed at 200 and 800 nm. The UV-Vis spectra recorded in diffuse reflectance (R sample ) mode were transformed using the Kubelka-Munk function, which is based on determination of Kubelka-Munk absorption (K) and scattering (S) coefficients, using equation 8: 44,45 (8) where R ∞ is defined as R sample /R reference , with R reference as the diffuse reflectance value obtained for BaSO 4 using equation 9:…”

Section: 13mentioning

confidence: 99%

“…Indirect optical bandgap values (E gap ; eV) were obtained from a Tauc plot, (F(R ∞ )hv) 1/2 , as a function of photon energy hv, considering the intersection of the linear portion of the curve with the x-axis. 45 For FTIR, the samples were shaped into pellets using potassium bromide and spectra recorded on a PerkinElmer 100 spectrophotometer in the 4000-450 cm -1 range. Elemental composition was determined by XPS.…”

Section: 13mentioning

confidence: 99%

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Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Bezerra¹,

Cavalcante²,

Garcia³

et al. 2017

J. Braz. Chem. Soc.

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This article reports the synthesis and characterization of pure and N-, B-, and Ag-doped TiO 2 and the ability of these oxides to photodegrade methylene blue (MB) under sunlight or UV-ABC radiation. The compounds were synthesized using the sol-gel method and characterized by scanning electron microscopy, X-ray diffraction, diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. Photocatalytic efficiency was significantly increased by N-doping, resulting in 98% MB decomposition under UV-ABC irradiation for 180 min. Ag-and B-doped TiO 2 lowered MB degradation rates to 52 and 73%, respectively, compared with pure TiO 2 . The same behavior was observed with exposure to UV-Vis, with 88, 65, 60, and 42% MB removal with N-doped, pure, B-doped, and Ag-doped TiO 2 , respectively. Under visible light alone, N-doped TiO 2 exhibited higher photocatalytic efficiency than commercial P25-type TiO 2 . Photocatalysis with N-doped TiO 2 proved to be a promising alternative for MB degradation, given the potential of employing solar energy, thus minimizing operating costs.

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Section: 13mentioning

confidence: 99%

Section: 13mentioning

confidence: 99%

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Bezerra¹,

Cavalcante²,

Garcia³

et al. 2017

J. Braz. Chem. Soc.

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“…The first uses alcohol as solvent [21], while the second uses water [23,24]. For each type of synthesis, pure and MWCNT-doped (4 wt%) sols were produced.…”

Section: Preparation Of Solsmentioning

confidence: 99%

“…One motivation to choose the sol-gel process is the possibility of producing large film surfaces, quickly and at reasonable costs, which is a sine qua non condition for the development of easy-to-clean/self-cleaning coatings [3,6,7,10,[19][20][21]. Contrary to aqueous synthesis which allows the production of crystalline anatase at low temperature [23], alcoholic synthesis requires calcination to transform amorphous TiO 2 into anatase. Because TiO 2 films are calcined at around 500°C for anatase crystallisation [21,22] and the MWCNT combustion temperature is around 450°C [2,7,10,[18][19][20], various calcination temperatures of alcoholic samples are tested in this study to optimise TiO 2 crystallisation without degrading MWCNTs.…”

Section: Introductionmentioning

confidence: 99%

Doping TiO2 films with carbon nanotubes to simultaneously optimise antistatic, photocatalytic and superhydrophilic properties

Léonard

Remy

Heinrichs

2016

J Sol-Gel Sci Technol

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Pure and multiwall carbon nanotube (MWCNT)-doped titanium dioxide (TiO 2 ) films, synthesised from two sol-gel routes (alcoholic and aqueous) and deposited by dipcoating on glass, have been developed as conductive, photocatalytic and superhydrophilic materials. While already crystallised in anatase structure at low temperature when synthesised in water, samples prepared in alcohol are amorphous. Their crystallisation in air has been studied at increasing temperatures. Effective incorporation of functionalised MWCNTs is confirmed in both aqueous and alcoholic samples with a closer interaction with TiO 2 particles in the case of aqueous synthesis. In alcoholic samples, 400°C seems to be an optimised calcination temperature since 300°C does not allow crystallisation into anatase and 500°Cremoves MWCNTs through burning. The purpose of MWCNT doping is to obtain coatings that exhibit easy-toclean or self-cleaning properties. This can be achieved through an optimised combination of electrical conductivity (for antistatic property), photoactivity and superhydrophilicity. These three properties require the crystallisation of TiO 2 into anatase. MWCNT doping dramatically increases both conductivity and photocatalytic activity, especially in alcoholic samples for the former and in aqueous samples for the latter. On the other hand, MWCNT introduction does not significantly affect the (super)hydrophilicity of films, which depends solely on the crystallinity of TiO 2 . Graphical Abstract

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“…TiO 2 has several advantages, such as non-toxicity, chemical stability, and stability to photocorrosion. [1][2][3][4]. High absorbance and the high photoactivity of TiO 2 catalysts were observed upon UV light irradiation [5][6][7].…”

Section: Introductionmentioning

confidence: 96%

Preparation of gold-modified F,N-TiO2 visible light photocatalysts and their structural features comparative analysis

Shabalina

Fakhrutdinova

Chen

et al. 2015

J Sol-Gel Sci Technol

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An ambient temperature aqueous sol–gel processing of efficient nanocrystalline doped TiO2-based photocatalysts for the degradation of organic pollutants

Cited by 30 publications

References 25 publications

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Doping TiO2 films with carbon nanotubes to simultaneously optimise antistatic, photocatalytic and superhydrophilic properties

Preparation of gold-modified F,N-TiO2 visible light photocatalysts and their structural features comparative analysis

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