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

2011 ◽  
Vol 509 (13) ◽  
pp. 4557-4562 ◽  
Author(s):  
Kangle Lv ◽  
Jiaguo Yu ◽  
Longzhe Cui ◽  
Shulin Chen ◽  
Mei Li
Keyword(s):  
Photocatalytic Activity ◽  
Anatase Tio2 ◽  
Thermally Stable ◽  
Tio2 Photocatalyst

First-Principles Study on Electronic and Optical Properties in Pr-Doped Anatase TiO2

2014 ◽  
Vol 924 ◽  
pp. 260-268 ◽  
Author(s):  
Hao Chen ◽  
Lan Fang Yao ◽  
Song Lin Yang ◽  
Ya Qin Wang ◽  
Xing Liang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photocatalytic Activity ◽  
First Principles ◽  
Energy Gap ◽  
Impurity Band ◽  
Anatase Tio2 ◽  
Electron Hole ◽  
Light Region ◽  
Overlap Population ◽  
Calculation Results

The crystal structures, band structures, density of states, charge density, overlap population and optical properties of pure anatase TiO2 and Pr-doped anatase TiO2 were studied by using the plane-wave pseudopotential method based on the first-principles. After Pr doping, the valence band and the conduction band moved down and became dense, energy gap became narrow and a impurity band which consists of Pr 4f states appeared. And the dipole moment got improved, which is good for the separate of the electron-hole pairs. These effectively overcome two huge shortcomings of TiO2. Besides, Pr-doped anatase TiO2 produced more carriers which have good transport properties and the absorption spectra of Pr-O bond appear in the region that the wavelength is longer. The calculation results of optical properties show that the absorption edge occured red shift, which means the photocatalytic activity of anatase TiO2 got remarkable improved during visible-light region. This conforms to the previous analysis. So the photocatalytic activity of anatase TiO2 got remarkable improved after Pr doping.

The sol-gel synthesis and photocatalytic activity of Gd-SiO2-TiO2 photocatalyst

2019 ◽  
Vol 733 ◽  
pp. 136676 ◽  
Author(s):  
Hongwei Feng ◽  
Hui Xu ◽  
Hongtu Feng ◽  
Ying Gao ◽  
Xinyuan Jin
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Tio2 Photocatalyst ◽  
Sol Gel Synthesis

scholarly journals Synthesis and Characterization of Ag@C-TiO2 Nanocomposite for Degradation of Sasirangan Textile Wastewater

2019 ◽  
Vol 22 (6) ◽  
pp. 299-304
Author(s):  
Heny Puspita Dewi ◽  
Joko Santoso ◽  
Nur Firda Trianda ◽  
Rodiansono Rodiansono
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Textile Wastewater ◽  
Band Gap Energy ◽  
Tio2 Photocatalyst ◽  
Composite Photocatalysts ◽  
Xrd Patterns ◽  
Brookite Phase

Carbon-titanium oxide nanocomposite (denoted as @C-TiO2) was successfully synthesized via hydrothermal method at 150°C for 24 h. The C-TiO2 nanocomposite was furtherly modified by adding an Ag metal dopant (denoted as Ag@C-TiO2) to improve and applied to the photocatalytic degradation of Sasirangan textile wastewater. The composite photocatalysts were characterized by XRD and UV–Vis DRS spectroscopies. XRD patterns showed that TiO2 in @C-TiO2 mainly consisted of a brookite phase, as indicated by a series sharp diffraction peak at 2θ = 27.2° (111), 31.5° (121) and 55.9° (241). The calculated band gap energy (Eg) derived from UV-Vis DRS spectra for TiO2, @C-TiO2, and Ag@C-TiO2 were 2.95 eV, 2.54 eV, and 2.74 eV, respectively. Ag@C-TiO2 photocatalyst was found to be active for the photocatalytic degradation of Sasirangan textile wastewater, as indicated by the change of wastewater color from dark to clear. The quantitative photocatalytic activity of Ag@C-TiO2 was evaluated in the degradation of methylene blue, whereas the conversion of methylene blue was 41.3%. The addition of Ag to @C-TiO2 is believed to play an essential role in the enhancement of photocatalytic activity.

scholarly journals Enhanced photocatalytic bacterial inactivation of atomic-layer deposited anatase-TiO2 thin films on rutile-TiO2 nanotubes

2020 ◽  
Vol 19 (3) ◽  
pp. 399-405
Author(s):  
Joel Molina-Reyes ◽  
Alejandra Romero-Morán ◽  
José L. Sánchez-Salas
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Tio2 Nanotubes ◽  
Considerable Increase ◽  
Atomic Layer ◽  
Surface Modifications ◽  
Anatase Tio2 ◽  
Bacterial Inactivation ◽  
Tio2 Thin Films ◽  
Experimental Conditions

Experimental conditions to fabricate rutile-TiO2 nanotubes coated with a conformal anatase-TiO2 thin layer using ALD were reported. A considerable increase in the photocatalytic activity associated with these surface modifications was also observed.

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