Photocatalytic Degradation of NO2- by Fe3+-Doped TiO2 Nano Particles Prepared by Sol-Gel Method

2007 ◽  
Vol 544-545 ◽  
pp. 111-114 ◽  
Author(s):  
Ke Hui Qiu ◽  
Chun Mei Zhang ◽  
Jun Feng Li ◽  
Qun Li ◽  
Jie Zhao
Keyword(s):  
Electron Microscopy ◽  
Grain Size ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Influence Factors ◽  
Nano Particles ◽  
Photocatalytic Decomposition ◽  
Tio2 Photocatalysts ◽  
Doped Tio2

The preparation and the photocatalytic degradation NO2 - activity of Fe3+-doped TiO2 nano-sized particles is reported in this paper. The TiO2 nano particles were prepared by sol-gel method. The various influence factors about the synthesis process of the Fe3+-doped TiO2 nano photocatalyst were controlled and investigated by XRD (X-ray diffraction), SEM (scanning electron microscopy), and TEM (transmission electron microscopy) etc.. The results show that the phase compositions, crystalline grain size, crystal structure , and photocatalytic activity of the Fe3+-doped TiO2 particles prepared by the method depend on the synthesis technology parameters such as calcination temperature, holding time, Fe3+ ions concentration etc.. The influence factors of the preparation process has been discussed. The photocatalytic decomposition of NO2 - ion into N2 and O2 using Fe3+ and Ce4+-doped TiO2 photocatalysts were investigated under UV irradiation. It was fund that Fe3+-doped TiO2 photocatalysts shows much higher photocatalytic activity than that of the Ce4+-doped TiO2 . The photocatalytic decomposition effect of NO2 - ion is related to the crystalline grain size, irradiation time, and the Fe3+ ions concentration. The Fe3+-doped TiO2 nano powders exhibited the photocatalytic degradation NO2 - activity under UV light irradiation.

Influence Factors and Kinetic Study on Photocatalytic Degradation of Rhodamine B by Fe-Doped TiO2/Diatomite Composite

2012 ◽  
Vol 535-537 ◽  
pp. 2209-2213 ◽  
Author(s):  
Jun Xiong Lin ◽  
Lan Wang ◽  
Chong Sun
Keyword(s):  
Photocatalytic Degradation ◽  
Kinetic Study ◽  
Rhodamine B ◽  
Sol Gel ◽  
Influence Factors ◽  
Degradation Process ◽  
Operational Parameters ◽  
Gel Method ◽  
Doped Tio2 ◽  
Decolorization Efficiency

Supported Fe-doped TiO2 has been prepared by a sol-gel method through the use of porous diatomite. The synthesized Fe-doped TiO2/diatomite composites were characterized by SEM and EDX techniques. The composite presented in this study showed higher adsorption and photodegradation ability of Rhodamine B than TiO2/diatomite and diatomite. It was found that the decolorization efficiency were dependent on the operational parameters of pH, photocatalyst dosage and dye concentration, and about 85% of the initial 50 mg/L dye could be adsorbed and degraded in 240 min. Moreover, kinetic study indicated that the photocatalytic degradation process could be described by the Langmuir-Hinshelwood model.

Preparation and Photocatalytic Performances of F-Doped TiO2

2014 ◽  
Vol 936 ◽  
pp. 814-818 ◽  
Author(s):  
Xian Zhen Diao ◽  
Xi Li Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Doping Amount ◽  
Tio2 Photocatalysts ◽  
Infrared Spectrometer ◽  
Blue Solution ◽  
Lamp Illumination

Butyl acetate titanate as precursors, no water ethanol as solvent, pure TiO2 and different doping ratio of F/TiO2 photocatalysts were prepared through sol-gel method; And F doping amount on photocatalytic activity of TiO2 influences were analysed systematically through uv-vis spectrophotometer, infrared spectrometer, etc. Experimental results show that photocatalytic activity of TiO2 is better when the mole ratio of F is between 10% and 20%; When F doping amount is 20%, catalyst amount is 25g, the photocatalytic degradation rate of F/TiO2 can reach 85.74% in10%wt methylene blue solution under 250W high-voltage mercury lamp illumination after 2 hours and the area of illumination 6.94×10-3m2. In the same way, the photocatalytic degradation rate of pure TiO2 is just 35.39 %. It proves that F/TiO2 catalyst of doping amount 20% presents the best photocatalytic activity.

scholarly journals Photocatalytic Degradation of Rhodamine B and Methylene Orange Using TiO2-ZrO2 as Nanocomposite

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1035
Author(s):  
Víctor Ruíz-Santoyo ◽  
Virginia F. Marañon-Ruiz ◽  
Rafael Romero-Toledo ◽  
Oscar Arturo González Vargas ◽  
Alejandro Pérez-Larios
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Photoelectron Spectroscopy ◽  
Anatase Phase ◽  
Structural Defects ◽  
Kinetics Parameters ◽  
Doped Tio2 ◽  
X Ray

The present research reports the synthesis of ZrO2-doped TiO2 photocatalysts at different ZrO2 contents (1, 3 and 5% wt.) synthesized by the sol–gel method. The samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction, attenuated total reflectance-Fourier transform infrared, ultraviolet–visible, X-ray photoelectron spectroscopy and N2 adsorption–desorption analysis. The photocatalytic activity of the ZrO2-doped TiO2 was investigated against the dyes methyl orange and rhodamine B through mineralization studies. The ZrO2-doped TiO2 samples presented a semiglobular-ovoid agglomerate shape around 500–800 nm. The samples presented high crystallinity of the TiO2 anatase phase, XPS suggested the formation of Zr–O–Ti bonds and the samples were classified as mesoporous materials with slight changes in the optical features in comparison with pure TiO2. Our study shows that the ZrO2-doped TiO2 composites exhibited a higher photocatalytic activity than just utilizing the synthetized TiO2 and a commercial P25. The different degradation behaviors are attributed to differences in the textural properties, and to the different optical absorptions of the samples due to structural defects created by the level of doping of Zr4+ ions into the TiO2 lattice. Reaction kinetics parameters were calculated by the Langmuir–Hinshelwood model, and a third run cycle of the ZrO2-doped TiO2 at 1% wt. achieved a photocatalytic degradation of 78.1 and 75.5% for RhB and MO, respectively.

Preparation and Photocatalytic Activity of Fe-Doped TiO2 Nanopowders

2009 ◽  
Vol 610-613 ◽  
pp. 248-252
Author(s):  
Bai Xiang Ren ◽  
Hong Hui Teng
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Crystal Violet ◽  
Phase Transfer ◽  
Size Structure ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Doped Tio2 ◽  
Degradation Ratio ◽  
Tio2 Nanopowders

(0-2%) Fe-doped TiO2 nanopowders were prepared by sol-gel method. The Size, structure, appearance, the light absorption and hydroscopicity properties were characterized by XRD, TEM, UV-Vis and FTIR. The photocatalytic degradation of crystal violet under UV over catalyst was used as a probe reaction to evaluate their photocatalytic activity, the dependence of photocatalytic properties on Fe doping content and roasting temperature were also discussed. The results show that the process of phase transfer of TiO2 from anatase to rutile was promoted by doping Fe, 1.5% Fe3+-doped TiO2 nanoparticles formed many defects at grain boundaries, inhibited effectively the recombination of the photoproduced e-/h+, improved the efficiency of photons, enhanced the absorbing water function of catalyst, and 1.5% Fe3+-doped TiO2 revealled strongly absorption in UV and widened obviously absorption in Vis. Photocatalytic degradation ratio of crystal violet (4mg/L) on 1.5% Fe3+-doped TiO2 was increased 30% than pure TiO2.

Comparative Study on the Effect of Preparation of TiO2 and the Photocatalytic Degradation of Phenol Based on the Biological Template

2014 ◽  
Vol 908 ◽  
pp. 195-198
Author(s):  
Jing Wang ◽  
Li Da Sun ◽  
Zi Jing Li ◽  
Yan Hua Tang
Keyword(s):  
Photocatalytic Activity ◽  
Comparative Study ◽  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Degradation Rate ◽  
Sol Gel ◽  
Catalytic Performance ◽  
High Photocatalytic Activity ◽  
Template Method ◽  
Tio2 Photocatalysts

This study combines the template method and sol-gel method, prepares TiO2 photocatalytic materials with the cotton, leaves and towel gourd as the template, and then makes degradation of phenol in ultraviolet light with the prepared TiO2 photocatalysts. The results show that all the photocatalyst prepared with three kinds of templates have high photocatalytic activity, among which, the catalytic performance of cotton is better, leaves secondly, and towel gourd’s relatively poor. With cotton as templates for the preparation of TiO2 under UV irradiation for 6h, the degradation rate was 80%, leaves as template for the preparation of TiO2 under UV irradiation for 6h, the degradation rate was 63%, and with towel gourd as template for the preparation of TiO2 under UV irradiation for 6h, the degradation rate was 52%.

scholarly journals Enhanced Photocatalytic Activity of CuWO4 Doped TiO2 Photocatalyst Towards Carbamazepine Removal under UV Irradiation

Separations ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 25
Author(s):  
Chukwuka Bethel Anucha ◽  
Ilknur Altin ◽  
Emin Bacaksız ◽  
Tayfur Kucukomeroglu ◽  
Masho Hilawie Belay ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Component Part ◽  
Energy Yield ◽  
Mechanical Agitation ◽  
X Ray

Abatement of contaminants of emerging concerns (CECs) in water sources has been widely studied employing TiO2 based heterogeneous photocatalysis. However, low quantum energy yield among other limitations of titania has led to its modification with other semiconductor materials for improved photocatalytic activity. In this work, a 0.05 wt.% CuWO4 over TiO2 was prepared as a powder composite. Each component part synthesized via the sol-gel method for TiO2, and CuWO4 by co-precipitation assisted hydrothermal method from precursor salts, underwent gentle mechanical agitation. Homogenization of the nanopowder precursors was performed by zirconia ball milling for 2 h. The final material was obtained after annealing at 500 °C for 3.5 h. Structural and morphological characterization of the synthesized material has been achieved employing X-ray diffraction (XRD), Fourier transform infra-red (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) N2 adsorption–desorption analysis, Scanning electron microscopy-coupled Energy dispersive X-ray spectroscopy (SEM-EDS), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectroscopy (UV-vis DRS) for optical characterization. The 0.05 wt.% CuWO4-TiO2 catalyst was investigated for its photocatalytic activity over carbamazepine (CBZ), achieving a degradation of almost 100% after 2 h irradiation. A comparison with pure TiO2 prepared under those same conditions was made. The effect of pH, chemical scavengers, H2O2 as well as contaminant ion effects (anions, cations), and humic acid (HA) was investigated, and their related influences on the photocatalyst efficiency towards CBZ degradation highlighted accordingly.

Study on photocatalytic degradation of gaseous dichloromethane using pure and iron ion-doped TiO2 prepared by the sol–gel method

Chemosphere ◽  
2007 ◽  
Vol 66 (11) ◽  
pp. 2142-2151 ◽  
Author(s):  
Wen-Chi Hung ◽  
Ssu-Han Fu ◽  
Jeou-Jen Tseng ◽  
Hsin Chu ◽  
Tzu-Hsing Ko
Keyword(s):  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Iron Ion ◽  
Gel Method ◽  
Doped Tio2 ◽  
Sol Gel Method

scholarly journals Nickel and sulfur codoped TiO2 nanoparticles for efficient visible light photocatalytic activity

2021 ◽  
Author(s):  
Mehala Kunnamareddy ◽  
Ranjith Rajendran ◽  
Megala Sivagnanam ◽  
Ramesh Rajendran ◽  
Barathi Diravidamani
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Fourier Transforms ◽  
Phase Particle ◽  
Energy Dispersive Spectrometer ◽  
Sol Gel ◽  
Bandgap Energy ◽  
Visible Light Absorption

AbstractIn this work, Nickel (Ni) and sulfur (S) codoped TiO2 nanoparticles were prepared by a sol-gel technique. The as-prepared catalyst was characterized using X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), FT-Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectra (DRS) for investigating crystal structure, crystal phase, particle size and bandgap energy of these samples. The photocatalytic performances of all the prepared catalysts have been investigated for the degradation of methylene blue (MB) under visible light irradiation. It was noticed that Ni-S codoped TiO2(Ni-S/TiO2) nanoparticles exhibited much higher photocatalytic activity compared with pure, Ni and S doped TiO2 due to higher visible light absorption and probable decrease in the recombination of photo-generated charges. It was decided that the great visible light absorption was created for codoped TiO2 by the formation of impurity energy states near both the edges of the collection, which works as trapping sites for both the photogenerated charges to decrease the recombination process.

Synergistic Effect of Eu3+ and Sm3+ Co-Doping on Photocatalytic Activity of TiO2 Nanoparticles

2011 ◽  
Vol 197-198 ◽  
pp. 891-894 ◽  
Author(s):  
Cheng Zhi Jiang ◽  
Xu Dong Lu
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Sol Gel ◽  
Blue Shift ◽  
Nano Particles ◽  
Absorption Profile ◽  
Co Doping ◽  
The Matrix ◽  
Co Doped ◽  
The Eu

Pure TiO2, Eu3+and Sm3+co-doping TiO2composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2nano-particles increases after co-doping of Eu3+and Sm3+and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+and Sm3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+and Sm3+co-doped into TiO2nano-particles exert a synergistic effect on their photocatalytic activity.

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