Synthesis, characterization, and photocatalytic activity of TiO2−xNx nanocatalyst

Wang, Y.Q.; Yu, Xin; Sun, Dezhi

doi:10.1016/j.jhazmat.2006.10.033

Cited by 81 publications

(45 citation statements)

References 34 publications

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“…Titanium dioxide (TiO 2 ) is an effective photocatalyst, which is widely studied for the degradation of organic pollutants in water after the discovery of the TiO 2 -photoassisted electrochemical splitting of water reported by Fujishima and Honda in 1972 [1]. TiO 2 exists in nature in three polymorphic forms (anatase, rutile, and brookite), which differ only in the arrangement of their TiO 6 octahedra; anatase (tetragonal) consists of octahedral shearing vertices; rutile (tetragonal) is connected by edges; and in brookite (orthorhombic), both edges and vertices are connected.…”

Section: Introductionmentioning

confidence: 99%

“…X-ray diffraction (XRD) patterns of control and doped TiO 2 powders were recorded with Phillips PW 1710 diffractometer using monochromatic high intensity Cu Kα radiations (λ = 0.15418 nm) at a scanning rate of 0.03°/sec and in the scanning range from 10 to 80°. The crystallite size (D) was estimated using the Scherrer equation (1), and the rutile phase content was calculated using (2) [20]. The peak intensity of [101] of anatase and [110] of rutile reflections located at 25.4°and 27.4°on 2θ (degrees) x-axis was used.…”

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confidence: 99%

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Chelated Nitrogen-Sulphur-Codoped TiO₂: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies

Khan

Swati

Younas

et al. 2017

International Journal of Photoenergy

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This study presents in detail the physicochemical, photoluminescent, and photocatalytic properties of carboxylic acid chelated nitrogen-sulphur-codoped TiO 2 . From the Fourier transform infrared spectroscopic study, it was revealed that the formate group formed bidentate bridging linkage while the acetate group coordinated in a bidentate chelating mode with a titanium precursor. In compliance with X-ray diffraction data, the anatase to rutile transformation temperature was extended due to carboxylic acid chelation and NS codoping. Raman analysis indicated four Raman peaks at 146, 392, 512, and 632 cm −1 for the precalcined chelated TiO 2 ; on incorporation with NS dopants, an increase in Raman intensity for these peaks was recorded, indicating the structure stability of the anatase phase. Furthermore, X-ray photoelectron spectroscopic study revealed the presence of anionic doping of nitrogen and cationic doping of sulphur in the lattice of TiO 2 . When evaluating the UV-visible photodegradation rate of 4-chlorophenol, the modified TiO 2 (NS 0.06 -TFA) showed the highest photocatalytic activity. In connection with the activity tests, several scavenger agents were employed to elucidate the significance of the different reactive oxidizing species during the photocatalytic process. Moreover, the transfer pathways of photogenerated carriers and the photocatalytic reaction mechanism of modified TiO 2 were also explained in detail.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Chelated Nitrogen-Sulphur-Codoped TiO₂: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies

Khan

Swati

Younas

et al. 2017

International Journal of Photoenergy

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“…The product powder was dried and calcined at 350 8C. [34] Surface fluorinated TiO 2 (FÀTiO 2 ) was prepared by adding 10 mm NaF to an aqueous TiO 2 suspension. [25,35] Surface platinized TiO 2 (Pt/TiO 2 ) with a typical Pt loading of 1 wt % was prepared using a photodeposition method as described elsewhere.…”

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confidence: 99%

Fullerol–Titania Charge‐Transfer‐Mediated Photocatalysis Working under Visible Light

Park

Singh

Kim

et al. 2009

Chemistry A European J

105

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The development of visible-light-active photocatalysts is being investigated through various approaches. In this study, C(60)-based sensitized photocatalysis that works through the charge transfer (CT) mechanism is proposed and tested as a new approach. By employing the water-soluble fullerol (C(60)(OH)(x)) instead of C(60), we demonstrate that the adsorbed fullerol activates TiO(2) under visible-light irradiation through the "surface-complex CT" mechanism, which is largely absent in the C(60)/TiO(2) system. Although fullerene and its derivatives have often been utilized in TiO(2)-based photochemical conversion systems as an electron transfer relay, their successful photocatalytic application as a visible-light sensitizer of TiO(2) is not well established. Fullerol/TiO(2) exhibits marked visible photocatalytic activity not only for the redox conversion of 4-chlorophenol, I(-), and Cr(VI), but also for H(2) production. The photoelectrode of fullerol/TiO(2) also generates an enhanced anodic photocurrent under visible light as compared with the electrodes of bare TiO(2) and C(60)/TiO(2), which confirms that the visible-light-induced electron transfer from fullerol to TiO(2) is particularly enhanced. The surface complexation of fullerol/TiO(2) induced a visible absorption band around 400-500 nm, which was extinguished when the adsorption of fullerol was inhibited by fluorination of the surface of TiO(2). The transient absorption spectroscopic measurement gave an absorption spectrum ascribed to fullerol radical cations (fullerol(*+)) the generation of which should be accompanied by the proposed CT. The theoretical calculation regarding the absorption spectra for the (TiO(2) cluster+fullerol) model also confirmed the proposed CT, which involves excitation from HOMO (fullerol) to LUMO (TiO(2) cluster) as the origin of the visible-light absorption.

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“…The beneficial effect of nitrogen on the photocatalytic activity of TiO 2 was first described by Asahi et al [6]. Subsequent studies reported that nitrogen doped TiO 2 exhibits absorption in the visible region and shows an enhanced photocatalytic activity under visible light irradiation [7][8][9]. Recently, studies about the hydrogen production via photocatalysis, using N-TiO 2 materials were reported in literature [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Pt/N–TiO2 Aerogel Composites Used for Hydrogen Production Via Photocatalysis Process

et al. 2014

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Synthesis, characterization, and photocatalytic activity of TiO2−xNx nanocatalyst

Cited by 81 publications

References 34 publications

Chelated Nitrogen-Sulphur-Codoped TiO₂: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies

Chelated Nitrogen-Sulphur-Codoped TiO₂: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies

Fullerol–Titania Charge‐Transfer‐Mediated Photocatalysis Working under Visible Light

Pt/N–TiO2 Aerogel Composites Used for Hydrogen Production Via Photocatalysis Process

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Synthesis, characterization, and photocatalytic activity of TiO2−xNx nanocatalyst

Cited by 81 publications

References 34 publications

Chelated Nitrogen-Sulphur-Codoped TiO2: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies

Chelated Nitrogen-Sulphur-Codoped TiO2: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies

Fullerol–Titania Charge‐Transfer‐Mediated Photocatalysis Working under Visible Light

Pt/N–TiO2 Aerogel Composites Used for Hydrogen Production Via Photocatalysis Process

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Chelated Nitrogen-Sulphur-Codoped TiO₂: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies

Chelated Nitrogen-Sulphur-Codoped TiO₂: Synthesis, Characterization, Mechanistic, and UV/Visible Photocatalytic Studies