Sol–gel derived S,I-codoped mesoporous TiO2 photocatalyst with high visible-light photocatalytic activity

2010 ◽  
Vol 71 (9) ◽  
pp. 1337-1343 ◽  
Author(s):  
Changlin Yu ◽  
Dingjian Cai ◽  
Kai Yang ◽  
Jimmy C. Yu ◽  
Yang Zhou ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Mesoporous Tio2 ◽  
Tio2 Photocatalyst ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

scholarly journals BiOCl/TiO2/diatomite composites with enhanced visible-light photocatalytic activity for the degradation of rhodamine B

2019 ◽  
Vol 10 ◽  
pp. 1412-1422 ◽  
Author(s):  
Minlin Ao ◽  
Kun Liu ◽  
Xuekun Tang ◽  
Zishun Li ◽  
Qian Peng ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

A BiOCl/TiO2/diatomite (BTD) composite was synthesized via a modified sol–gel method and precipitation/calcination method for application as a photocatalyst and shows promise for degradation of organic pollutants in wastewater upon visible-light irradiation. In the composite, diatomite was used as a carrier to support a layer of titanium dioxide (TiO2) nanoparticles and bismuth oxychloride (BiOCl) nanosheets. The results show that TiO2 nanoparticles and BiOCl nanosheets uniformly cover the surface of diatomite and bring TiO2 and BiOCl into close proximity. Rhodamine B was used as the target degradation product and visible light (λ > 400 nm) was used as the light source for the evaluation of the photocatalytic properties of the prepared BTD composite. The results show that the catalytic performance of the BTD composite under visible-light irradiation is much higher than that of TiO2 or BiOCl alone. When the molar ratio of BiOCl to TiO2 is 1:1 and the calcination temperature is 400 °C, the composite was found to exhibit the best catalytic effect. Through the study of the photocatalytic mechanism, it is shown that the strong visible-light photocatalytic activity of the BTD composite results mainly from the quick migration of photoelectrons from the conduction band of TiO2/diatomite to the surface of BiOCl, which promotes the separation effect and reduces the recombination rate of the photoelectron–hole pair. Due to the excellent catalytic performance, the BTD composite shows great potential for wide application in the field of sewage treatment driven by solar energy.

scholarly journals Non-aqueous sol–gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity

RSC Advances ◽  
2014 ◽  
Vol 4 (87) ◽  
pp. 46762-46770 ◽  
Author(s):  
Mohamed Karmaoui ◽  
David M. Tobaldi ◽  
Andrijana Sever Skapin Andrijana Sever Skapin ◽  
Robert C. Pullar ◽  
Maria P. Seabra ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Low Temperature ◽  
Visible Light ◽  
Sol Gel ◽  
Solvothermal Process ◽  
One Pot ◽  
Visible Light Photocatalytic Activity ◽  
Sol Gel Synthesis ◽  
Visible Light Photocatalytic

A novel, facile method based on a non-aqueous sol–gel solvothermal process has been developed to synthesise spherical TiO2 nanoparticles (NPs) in one pot.

Facile Hydrothermal-Ion-Exchange Synthesis and Enhanced Visible Light Photocatalytic Activity of Bi4Ti3O12/Bi2S3 Heterostructure

NANO ◽  
2018 ◽  
Vol 13 (01) ◽  
pp. 1850012 ◽  
Author(s):  
Na Cao ◽  
Huiling Du ◽  
Jun Liu ◽  
Lianli Wang
Keyword(s):  
Photocatalytic Activity ◽  
Ion Exchange ◽  
Visible Light ◽  
Exchange Reaction ◽  
Sol Gel ◽  
Practical Application ◽  
Visible Light Photocatalytic Activity ◽  
Ion Exchange Reaction ◽  
Excellent Property ◽  
Visible Light Photocatalytic

Bi4Ti3O[Formula: see text]/Bi2S3 heterostructures with enhanced visible light photocatalytic activity are successfully synthesized via a two-step synthesis route based on a sol–gel hydrothermal method and a subsequent hydrothermal-ion exchange reaction technique. The structures, composition, morphologies and light absorption capability of Bi4Ti3O[Formula: see text]/Bi2S3 heterostructures are verified by XRD, XPS, SEM, TEM and UV-Vis diffuse reflectance spectra, respectively. Results indicated that Bi2S3 nanorods are grown on the surface of the spherical structure assembled by criss-cross nanosheets of Bi4Ti3O[Formula: see text] after ion exchange reaction. The photocatalytic tests reveal that the Bi4Ti3O[Formula: see text]/Bi2S3 heterostructures showed much higher photocatalytic activity than pure Bi4Ti3O[Formula: see text] or Bi2S3. The tight interconnection between the two semiconductors will facilitate the photoinduced carriers’ separation. Owing to the easy preparation and excellent property, the obtained Bi4Ti3O[Formula: see text]/Bi2S3 heterostructures may be promising photocatalysts for practical application.

scholarly journals Enhanced Visible Light Photocatalytic Activity of Mesoporous AnataseTiO2Codoped with Nitrogen and Chlorine

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Xiuwen Cheng ◽  
Xiujuan Yu ◽  
Zipeng Xing ◽  
Lisha Yang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Light Absorption ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Visible Region ◽  
X Ray ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

Anatase mesoporous titanium dioxide codoped with nitrogen and chlorine (N-Cl-TiO2) photocatalysts were synthesized through simple one-step sol-gel reactions in the presence of ammonium chloride. The resulting materials were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflection spectrum (UV-vis DRS). XRD results indicated that codoping with nitrogen and chlorine could effectively retard the phase transformation of TiO2from anatase to rutile and the growth of the crystallite sizes. XPS revealed that nitrogen and chlorine elements were incorporated into the lattice of TiO2through substituting the lattice oxygen atoms. DRS exhibited that the light absorption of N-Cl-TiO2in visible region was greatly improved. As a result, the band gap of TiO2was reduced to 2.12 eV. The photocatalytic activity of the as-synthesized TiO2was evaluated for the degradation of RhB and phenol under visible light irradiation. It was found that N-Cl-TiO2catalyst exhibited higher visible light photocatalytic activity than that of P25 TiO2and N-TiO2, which was attributed to the small crystallite size, intense light absorption in visible region, and narrow band gap.

scholarly journals Surface-Plasmon-Induced Visible Light Photocatalytic Activity of Fe3O4/TiO2 Nanocomposite

2020 ◽  
Author(s):  
Narjes Esmaeili ◽  
Azadeh Ebrahimian Pirbazari ◽  
Ziba Khodaee
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Plasmon ◽  
Resonance Effect ◽  
Sol Gel ◽  
Analytical Techniques ◽  
Visible Light Photocatalytic Activity ◽  
Structure Morphology ◽  
Gel Technique ◽  
Visible Light Photocatalytic

In this research, first a binary nanocomposite of magnetic recyclable photocatalyst Fe3O4/TiO2, was synthesized by sol gel technique. Then, in order to enhance the photocatalytic activity of the synthesized nanocomposite, it was deposited by silver nanoparticles for using in degradation of organic pollutants 2, 4-dichlorophenol (2, 4-DCP) under visible light. A range of analytical techniques including XRD, FESEM/EDX, DRS, VSM and N2 physisorption were employed to reveal the crystal structure, morphology and property of the nanocomposites. We obtained 32% and 55% degradation of 2, 4-DCP under visible light after 180 min irradiation in the presence of Fe3O4/TiO2 and Fe3O4/TiO2/Ag respectively. Thus, the excellent visible light photocatalytic activity of Fe3O4/TiO2/Ag sample can be attributed to the surface plasmon resonance effect of Ag nanoparticles deposited on Fe3O4/TiO2 nanocomposite.

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