Influence of MoS2 deposition time on the photocatalytic activity of MoS2/ V, N co-doped TiO2 heterostructure thin film in the visible light region

2018 ◽  
Vol 18 (6) ◽  
pp. 737-743 ◽  
Author(s):  
Hang Nguyen Thai Phung ◽  
Nguyen Duc Truong ◽  
Phuong Ai Duong ◽  
Le Vu Tuan Hung
Keyword(s):  
Thin Film ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Deposition Time ◽  
Visible Light Region ◽  
Doped Tio2 ◽  
Light Region ◽  
Co Doped

Microwave Assisted Solvothermal Synthesis and Visible Light Photocatalytic Properties of Nb and N Co-Doped SrTiO3 Nanoparticles

2010 ◽  
Vol 63 ◽  
pp. 52-57 ◽  
Author(s):  
Uyi Sulaeman ◽  
Shu Yin ◽  
Tsugio Sato
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Solvothermal Synthesis ◽  
Solvothermal Reaction ◽  
Visible Light Region ◽  
Co Doping ◽  
Microwave Assisted ◽  
Light Region ◽  
Co Doped ◽  
Visible Light Photocatalytic

Niobium and nitrogen co-doped SrTiO3 possessing excellent visible light responsive photocatalytic activity was successfully synthesized by microwave-assisted solvothermal reaction using SrCl2.6H2O, Ti(OC3H7)4, NbCl5 and hexamethylenetetramine in KOH aqueous solution. The photocatalytic activity was determined by DeNOx ability using LED lamps with the wavelengths of 627 nm (red), 530 nm (green), 445 nm (blue) and 390 nm (UV). The photocatalytic activity of SrTiO3 for DeNOx ability in visible light region could be improved by co-doping Nb5+ and N3-. The excellent visible light photocatalytic activity of this substance may be due to the generation of a new band gap that enables to absorb visible light and decrease in the lattice defects which acts as a recombination center of photoinduced electrons and holes.

PHOTOCATALYTIC ACTIVITY UNDER VISIBLE LIGHT REGION OF Ca-MODIFIED TiO2NP FILMS PREPARED BY SPARKING OFF Ca-ELECTROPLATED Ti TIPS

2018 ◽  
Vol 25 (Supp01) ◽  
pp. 1840002 ◽  
Author(s):  
NIDCHAMON JUMRUS ◽  
ARISARA PANTHAWAN ◽  
TEWASIN KUMPIKA ◽  
WATTIKON SROILA ◽  
EKKAPONG KANTARAK ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Quartz Substrate ◽  
Ambient Air ◽  
Visible Light Region ◽  
Structural And Optical Properties ◽  
Uniform Size ◽  
Light Region ◽  
Vis Spectroscopy ◽  
Electroplating Process

In this work, calcium (Ca)-modified titanium dioxide (TiO2) nanoparticulate (NP) films were successfully prepared using sparking off Ca-electroplated Ti tips. Aqueous solution of calcium carbonate (CaCO3) was used as electrolyte in the electroplating process. The experiment was carried out using electric current of 0.02[Formula: see text]mA applied to titanium electrodes for 10[Formula: see text]min. The NP films with small and uniform size were deposited on quartz substrate using the sparking process with a high DC voltage of 4[Formula: see text]kV in ambient air. The as-deposited NP films were then annealed at 800∘C, 900∘C and 1000∘C for 3[Formula: see text]h under atmospheric pressure to improve their crystallinity. Morphology, structural and optical properties of the NP films were characterized by SEM, XRD, Raman, XPS and UV-Vis spectroscopy. The effects of annealing temperature on the properties of the as-deposited and annealed NP films were reported. Furthermore, photocatalytic activity against 10 [Formula: see text]M of methylene blue (MB) under visible light region will be discussed.

A systemic study on Gd, Fe and N co-doped TiO2 nanomaterials for enhanced photocatalytic activity under visible light irradiation

2020 ◽  
Vol 46 (15) ◽  
pp. 24744-24752 ◽  
Author(s):  
Weichao Li ◽  
Linkun Xie ◽  
Liexing Zhou ◽  
Josias Ochoa-Lozano ◽  
Chen Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Doped Tio2 ◽  
Tio2 Nanomaterials ◽  
Co Doped

Preparation of Fe/N Co-Doped TiO2 Powders by Mild Hydrothermal Method

2014 ◽  
Vol 804 ◽  
pp. 217-220 ◽  
Author(s):  
Jun Na Xu ◽  
Wen Xiu Liu ◽  
Peng Sun ◽  
Ming Guan ◽  
Wen Bin Cao
Keyword(s):  
Grain Size ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Visible Light Irradiation ◽  
Light Absorption ◽  
Visible Light Region ◽  
Light Region ◽  
One Step ◽  
Lower Temperature ◽  
Co Doped

Yellow colored anatase Fe/N co-doped TiO2powders have been successfully synthesized by one step hydrothermal method at a lower temperature. The grain size was about 10 nm and the specific surface area of the powders ranged from 160 to 166 m2/g. The light absorption of Fe/N co-doped TiO2powders was enhanced in the visible light region of 400~500 nm and a new absorption peak at about 470 nm appeared when the Fe/Ti ratio exceeded 0.5%. The visible light photoactivity of Fe/N co-doped TiO2powders has been greatly improved than that of un-doped TiO2powders under visible light irradiation.

Investigation of Electronic Structures of F-Doped TiO2 by First-Principles Calculation

2009 ◽  
Vol 620-622 ◽  
pp. 647-650 ◽  
Author(s):  
Ying Cui ◽  
Hao Du ◽  
Li Shi Wen
Keyword(s):  
Photocatalytic Activity ◽  
First Principles ◽  
Electronic Structures ◽  
Lower Energy ◽  
Anatase Tio2 ◽  
First Principles Calculation ◽  
Visible Light Region ◽  
Doped Tio2 ◽  
Light Region ◽  
Calculation Results

F-doped TiO2 has exhibited superior photocatalytic activity. However, its electronic structures and photocatalysis mechanism are still unclear. In the present work, the structural optimization and electronic structure of F-doped anatase TiO2 have been investigated by means of the first-principles pseudopotential total energy method. It has been demonstrated that F doping would modify the valence band at the lower energy direction in the F-doped TiO2. Calculation results confirm that doping of fluorine would not shift the absorption edge into the visible light region. Instead, we attributed its photocatalytic activity to the enhancement of the oxidative power of F-doped TiO2.

Characterization and activity of visible-light driven TiO2 photocatalyst doped with tungsten

2010 ◽  
Vol 62 (9) ◽  
pp. 2128-2133 ◽  
Author(s):  
T. Putta ◽  
M. C. Lu ◽  
J. Anotai
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Anatase Phase ◽  
Sol Gel ◽  
Light Illumination ◽  
Visible Light Region ◽  
Light Region ◽  
Acid Type ◽  
Visible Light Driven ◽  
Amorphous Tio2

This research aimed to expand the activity of TiO2 down to the visible light region by modifying the sol-gel conditions and doping with tungsten. The optimum conditions for calcination temperature, acid type, and heating rate were 200°C, HNO3, and 1°C/min, respectively. The undoped TiO2 synthesized under these conditions could significantly absorb the visible light whereas the commercial Degussa P-25 could not. The absorptivity decreased sequentially as the wavelength increased from 400 to 700 nm. Within 6 h of 2-W blue-light illumination, 23% of 0.1 mM 2-chlorophenol was removed. The XRD result showed that the crystalline was anatase phase. The visible-light absorption property of the TiO2 became even better when doped with tungsten. At the optimum W to TiO2 ratio of 0.5%, the degradation of 0.1 mM 2-chlorophenol increased to 53% indicating a higher photocatalytic activity. Both crystalline and amorphous TiO2 could exhibit the photocatalytic activity under the visible light region.

Synthesis of Mn-N-Codoped TiO2 Photocatalyst and its Photocatalytic Reactivity under Visible Light Irradiation

2009 ◽  
Vol 620-622 ◽  
pp. 683-686 ◽  
Author(s):  
Yun Hu ◽  
Xia Zhang ◽  
Chao Hai Wei
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Doping Concentration ◽  
Synthesis Method ◽  
Light Irradiation ◽  
Doped Tio2 ◽  
Codoped Tio2 ◽  
Light Region ◽  
Optimal Value

Visible-light responsible Mn-N-codoped TiO2 nanocrystal photocatalysts were synthesized for the first time by a simple hydrothermal synthesis method. X-ray powder diffraction (XRD) measurement indicated that all of the photocatalysts have an anatase crystallite structure and the increase of the doping concentration had less effect on the structure and particle size. Comparing to N-doped TiO2, a shift of the absorption edge of Mn-N-codoped TiO2 to a lower energy and a stronger absorption in the visible light region were observed. The Mn-N-codoped TiO2 showed a higher photocatalytic reactivity than undoped TiO2 and N-doped TiO2 for the photodegradation of rhodamine B (RhB) under visible light irradiation. The doping concentration had an optimal value, according to the highest photocatalytic activity. This suggested that Mn and N codoping has important effects on the improvement of visible-light responsible photocatalytic activity.

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