Enhancement of TiO2 Photocatalytic Activity by N- Doping Using the Gas Phase Impregnation Method

2009 ◽  
Vol 1217 ◽  
Author(s):  
Chennan Li ◽  
Sesha Srinivasan ◽  
Nikolai Kislov ◽  
Mark Schmidt ◽  
Lee Stefanakos ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Reaction Time ◽  
Nitrogen Source ◽  
Gas Phase ◽  
Threshold Concentration ◽  
Impregnation Method ◽  
Photocatalytic Efficiency ◽  
Doping Amount ◽  
Photocatalytic Effect ◽  
N Doping

AbstractThis paper investigated an inexpensive way to improve the overall photocatalytic activity of TiO2 by N- doping using anhydrous ammonia as the nitrogen source. Doping amount could be further optimized by controlling the reaction time. Experiments showed that photocatalytic effect has one threshold concentration. Lower or higher reaction will decrease the photocatalytic efficiency. Experiments showed that the suitable reaction temperature should be lower than 650oC.

Study on Photocatalytic Properties of Graphene/TiO2 Composite Prepared by Impregnation Method

2014 ◽  
Vol 881-883 ◽  
pp. 533-539
Author(s):  
Zhi Feng Wang ◽  
Yan Hui Zhang ◽  
Hua Fang ◽  
Jian Zhong Wang ◽  
Bao Sen Sun
Keyword(s):  
Reaction Time ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Diffuse Reflection ◽  
Photocatalytic Properties ◽  
Impregnation Method ◽  
Photocatalytic Efficiency ◽  
Initial Concentration ◽  
Alkaline Conditions ◽  
Degradation Degree

Impregnation method was used to prepare of graphene/TiO2composite. Its microstructure, phase and diffuse reflection properties were characterized by using of SEM, XRD and DRS. And the photocatalytic properties of graphene/TiO2composite changed with the reaction time, composite quantity added, X3B initial concentration and pH were investigated. The results show that the degradation degree of graphene/TiO2composite on X3B increases with reaction time increasing. Graphene/TiO2composite of GR3 has the best photocatalytic performance when the introduction of graphene was 0.4mg/g(TiO2). Degradation efficiency of GR3 on X3B increases with the quantity of GR3 added to the solution increasing. And the photocatalytic efficiency is the highest when GR3 is 0.15g. With increasing of X3B initial concentration, the solution degradation rate is decreased. And it is beneficial for graphene/TiO2composite to play its photocatalytic properties in the weak alkaline conditions.

Constructing and enhanced degradation rate of N-AZO/TiO2 core/shell nanocomposite by idiopathic molecular cladding process

2015 ◽  
Vol 08 (06) ◽  
pp. 1550072 ◽  
Author(s):  
Ya-Juan Deng ◽  
Jian-Dong Wang ◽  
Jin-Ku Liu ◽  
Qin Tong ◽  
Jiang-Jie Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Rhodamine B ◽  
Composite Structure ◽  
Degradation Rate ◽  
Core Shell ◽  
Photocatalytic Efficiency ◽  
Photocatalytic Effect ◽  
Photogenerated Electrons ◽  
Core Shell Structure ◽  
Enhanced Degradation

The N - AZO / TiO 2 heterogeneous nanocomposite with core/shell structure revealed a better photocatalytic activity than the single N - AZO nanocrystals (NCs) even though it has a good photocatalytic effect. The recombination degree of photo-induced electrons and holes reduced significantly after molecular TiO 2 layer composited on the surface of N - AZO NCs. From the experiment of degrading rhodamine B solution (2 × 10-5 g/L) under solar light, the optimum photocatalytic efficiency was the N - AZO / TiO 2 composite prepared by idiopathic molecule-cladding (IMC) process and the best proportion of Zn / Ti was 2:1 in our research, which improved by 67% than pure N - AZO . Moreover, the N - AZO / TiO 2 composite prepared by IMC process achieved a molecular combination level between the two components, which not only can improve the immobility of composite structure, but also can make the photogenerated electrons and holes transport easier.

The Experimental Research on Treatment of Cr (VI) -Containing Wastewater by N-Doped Nano-TiO2

2012 ◽  
Vol 610-613 ◽  
pp. 1497-1500 ◽  
Author(s):  
Shu Qin Wang ◽  
Ding Lin Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Experimental Research ◽  
Sol Gel ◽  
Doping Amount ◽  
Reduction Mechanisms ◽  
N Doping ◽  
Photocatalytic Reactions ◽  
Rate Controlling Step ◽  
Lamp Illumination

N-doping TiO2 was prepared by sol-gel method. The XRD, BET and UV techniques were used to characterize the crystalline structure.The photocatalytic effects of Cr (VI) were studied with the fluorescence lamp illumination. The visible light-induced photocatalytic reduction mechanisms of Cr (VI) were discussed. The results showed that N-doping nano-TiO2 increased the visible-light responsive photocatalytic activity because of the increase of the surface area and decrease the band gap. There are the optima of the dosage and pHvalue. The removal efficiency of Cr (VI) was greater than 95% when the doping amount of N was 28%, dosage was 1.5g and pH was 2.5. The photocatalytic reactions of Cr (VI) included two parts─adsorption and reduction which was the rate-controlling step. The results provide some references for the Cr (VI) control and further application of TiO2.

scholarly journals Formation and Photocatalytic Activity of BaTiO3Nanocubes via Hydrothermal Process

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Xinrun Xiong ◽  
Ruoming Tian ◽  
Xi Lin ◽  
Dewei Chu ◽  
Sean Li
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Photocatalytic Activity ◽  
Reaction Time ◽  
Hydrothermal Process ◽  
Photocatalytic Decomposition ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Methylene Orange ◽  
Hydrothermal Approach

We reported a facile hydrothermal approach to synthesize BaTiO3nanocubes with controlled sizes for degradation of methylene blue (MB). The nanocubes with reaction time of 48 hours exhibited the highest photocatalytic efficiency, owing to their narrower size distribution and better crystallinity compared to those of 24 hours and, at the meantime, smaller particle size than those of 72 hours. This work also demonstrated the degradation of methylene orange (MO) using BaTiO3nanocubes synthesized for 48 hours. Compared with the removal of MB, BaTiO3had lower photocatalytic activity on MO, mainly due to the poorer absorption behavior of MO on the surface of BaTiO3nanocubes. The degradation efficiency for each photocatalytic reaction was calculated. The possible mechanism of the photocatalytic decomposition on MB has been addressed as well.

scholarly journals Photocatalytic activity of Pr-modified TiO2 for the degradation of bisphenol A

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Denise S. Cordeiro ◽  
Fernando L. Cassio ◽  
Larissa Ciccotti ◽  
Thiago L. R. Hewer ◽  
Paola Corio ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Bisphenol A ◽  
Pore Diameter ◽  
Sol Gel ◽  
Bandgap Energy ◽  
Photocatalytic Efficiency ◽  
Average Pore ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Adsorption Desorption

AbstractPraseodymium doped TiO2 nanoparticles were successfully prepared by the sol–gel method and characterized by X-ray powder diffraction, N2 adsorption–desorption isotherm, and UV–vis spectroscopy. The effects of the dopant on the crystallite size, specific surface area, average pore diameter, pore volume, and bandgap energy were investigated. The photocatalytic activity of the catalysts was evaluated by bisphenol A degradation and mineralization, which is a representative endocrine disruptor. Furthermore, under visible light irradiation the Pr-modified TiO2 photocatalysts exhibited higher photocatalytic efficiency than unmodified TiO2. When praseodymium was loaded (1.0–5.0%) onto the surface of TiO2, the rates of degradation and mineralization were increased 3–5 times.

scholarly journals Facile Preparation of Efficient WO3Photocatalysts Based on Surface Modification

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Min Liu ◽  
Hongmei Li ◽  
Yangsu Zeng
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Impregnation Method ◽  
Light Spectra ◽  
Simple Strategy ◽  
Visible Light Active ◽  
Efficient Charge ◽  
Surface Modified

Tungsten trioxide (WO3) was surface modified with Cu(II) nanoclusters and titanium dioxide (TiO2) nanopowders by using a simple impregnation method followed by a physical combining method. The obtained nanocomposites were studied by scanning electron microscope, X-ray photoelectron spectroscopy spectra, UV-visible light spectra, and photoluminescence, respectively. Although the photocatalytic activity of WO3was negligible under visible light irradiation, the visible light photocatalytic activity of WO3was drastically enhanced by surface modification of Cu(II) nanoclusters and TiO2nanopowders. The enhanced photocatalytic activity is due to the efficient charge separation by TiO2and Cu(II) nanoclusters functioning as cocatalysts on the surface. Thus, this simple strategy provides a facile route to prepare efficient visible-light-active photocatalysts for practical application.

Effect of Vanadia Doping and Its Oxidation State on the Photocatalytic Activity of TiO2 for Gas-Phase Oxidation of Ethene

2008 ◽  
Vol 112 (48) ◽  
pp. 19102-19112 ◽  
Author(s):  
K. Bhattacharyya ◽  
S. Varma ◽  
A. K. Tripathi ◽  
S. R. Bharadwaj ◽  
A. K. Tyagi
Keyword(s):  
Photocatalytic Activity ◽  
Gas Phase ◽  
Oxidation State ◽  
Phase Oxidation ◽  
Gas Phase Oxidation
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