Photocatalytic Properties of Nitrogen-Sulfur Co-Doped TiO2 Films Coated on Glass Fiber

2013 ◽  
Vol 781-784 ◽  
pp. 2237-2240 ◽  
Author(s):  
Benjamas Noophum ◽  
Lek Sikong ◽  
Kalayanee Kooptanond
Keyword(s):  
Photocatalytic Activity ◽  
Glass Fibers ◽  
Sol Gel ◽  
Dip Coating ◽  
Band Gap Energy ◽  
Fluorescent Light ◽  
Co Doping ◽  
Light Region ◽  
Microstructure Morphology ◽  
Co Doped

The photocatalytic N-S co-doped TiO2films coated on glass fibers were successfully prepared by sol-gel, dip-coating and calcination methods. The effect of doping concentration on crystalline size, microstructure, morphology, optical property and photocatalytic activity was investigated. The films were characterized by XRD, SEM, EDS, UV-vis DRS and FT-IR. The photocatalytic activity was evaluated by the degradation of methylene blue (MB). N-S co-doping has an effect on light adsorption wavelength shifted to visible light region which can lower the band gap energy of N-S co-doped due to the replacement of O atom in TiO2by N and S atoms to form Ti-O-N and Ti-O-S structures. Thiourea, a source of nitrogen and sulfur could increase viscosity of sol used for coating on glass fibers, resulting in larger particles size and more surface roughness of the doped films.TiO2films with 5 mol% N-S co-doped showed an excellent photocatalytic performance under fluorescent light irradiation.

Synthesis and Properties of Carbon and Yttrium Co-Doped TiO2 Photocatalyst

2014 ◽  
Vol 809-810 ◽  
pp. 831-836
Author(s):  
Jian Mei Liu ◽  
Xing Hua Zhou ◽  
Zhong Qi Zhu ◽  
Jin Zhang ◽  
Qing Ju Liu
Keyword(s):  
Phase Transition ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Rutile Phase ◽  
Fluorescent Light ◽  
Yttrium Nitrate ◽  
Fluorescent Lamp ◽  
Experimental Conditions ◽  
Light Region ◽  
Co Doped

TiO2photocatalysts doped with different element of C and Y were synthesized by sol-gel process using glucose, yttrium nitrate and tetrabuty ltitanate as precursors. Samples characterized by XRD, XPS, TEM, PL and UV-Vis methods. The photocatalytic activity of samples was investigated by photocatalytic degradation of methylene-blue (MB) under the irradiation of fluorescent lamp. The results indicate that C ion and Y ion are incorporated into the lattice of TiO2, and C doping accelerate phase transition from anatase to rutile phase, but Y doping inhabits the phase transition. It was also found that both C and Y doping can broaden the absorption spectrum to visible light region and inhibit the recombination of the photo-generated electron and hole pairs. The synergy effect of co-doped C and Y ions provides C-Y-TiO2sample better photocatalytic activity than that of the single-doped samples and P25 under fluorescent lamp. The photocatalytic activity of the sample with C, Y co-doped is the best under the irradiation of fluorescent light. It is 94.23% within 3 hours and significantly higher than that of Degussa P25 (44.72%) under the same experimental conditions.

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.

Photocatalytic Degradation of Humic Acid Using Fe3+ and N-Doped 3SnO2/TiO2 Thin Films Coated on Glass Fibers

2014 ◽  
Vol 608 ◽  
pp. 164-169
Author(s):  
Peerawas Kongsong ◽  
Lek Sikong ◽  
Sutham Niyomwas ◽  
Vishnu Rachpech
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Humic Acid ◽  
Glass Fibers ◽  
Sol Gel ◽  
Composite Films ◽  
Dip Coating ◽  
High Photocatalytic Activity ◽  
Coating Methods ◽  
Uv Lamp

The Fe3+ and N–doped 3SnO2/TiO2 composite thin films and undoped films coated on glass fibers were prepared by sol–gel and dip–coating methods. The films were calcined at 600°C for 2 hour and characterized by XRD, SEM, EDS and XPS. The photocatalytic activity of the coated glass fibers was determined by means of degradation of a methylene blue (MB) solution and humic acid (HA). It was found that the optimized 20N/3SnO2/TiO2composite films exhibit a high photocatalytic activity and HA could be rapidly removed from water. The main factor affecting the HA degradation of 20N/3SnO2/TiO2 films is quantity of glass fibers loading, irradiation power of UV lamp and flow rate of water.

scholarly journals Characterization and Photocatalytic Activity of Nano-TiO2 Doped with Iron and Niobium for Turquoise Blue Dye Removal

2012 ◽  
Vol 12 (1) ◽  
pp. 34 ◽  
Author(s):  
Nhat Minh Doan ◽  
Carl Renan Estrellan ◽  
Anton Purnomo ◽  
Susan Gallardo ◽  
Chris Salim ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Anatase Phase ◽  
Sol Gel ◽  
Chemical Properties ◽  
Band Gap Energy ◽  
Blue Dye ◽  
Nano Tio2 ◽  
Co Doping ◽  
Reaction Rate Constants ◽  
Physical And Chemical

The nano-TiO2 photocatalysts doped with Iron and Niobium for dye wastewater treatment were prepared by temperature-controlled sol-gel method. The effects of these dopants on the physical and chemical properties of TiO2 were compared with the commercially available Degussa TiO2 P25. Among these characteristics are crystalline size, the presence of absolute anatase phase, band gap energy and specific surface area. The characterization data were correlated to photocatalytic activities using Turquoise blue dye (TBD) as model pollutant. Single doping (with Nb) and co-doping (Fe and Nb) catalyst reached complete decolorization within 2.5 hours and 3 hours. In addition, their kinetic reaction rate constants of apparent first-order model are 0.0258 min-1 and 0.0225 min-1, respectively. The presence of Nb as traps is considered to play a crucial key in enhancing the photocatalytic activity.

Effect of Co Doping on the Functional Properties of MnO2 Thin Films

2021 ◽  
Vol 09 (01n02) ◽  
Author(s):  
Bellal Sadouki ◽  
Hadj Benhebal ◽  
Bedhiaf Benrabah ◽  
Abdelmalek Kharroubi
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Complex Impedance ◽  
Cobalt Content ◽  
Dip Coating ◽  
Electrical Circuit ◽  
Co Doping ◽  
Glass Substrates ◽  
Coating Method ◽  
Co Doped

Thin films of Co-doped [Formula: see text]-MnO2 have been deposited on Pyrex glass substrates by the sol–gel dip-coating method with Co concentrations of 1, 3, 5 and 7 at.%. The deposited thin films were characterized for their structural, morphological, optical and electrical properties. The XRD spectra confirm that all the samples have tetragonal phase of [Formula: see text]-MnO2. FTIR spectra reveal the presence of Mn–O in all of the samples. AFM measurements indicate that the surfaces of films have been affected with cobalt content incorporation. Transmittance spectra of the undoped and Co-doped MnO2 thin films were recorded by a UV–vis spectrometer. Optical gap was found to be in the 2.60–2.51-eV scale. This decrease is due to the presence of manganese vacancies and/or oxygen defects. From the complex impedance measurements that show semicircular arcs at different cobalt contents, an equivalent parallel [Formula: see text] electrical circuit has been proposed.

FABRICATION AND PHOTOCATALYTIC PROPERTIES OF TiO2 NANOFILMS CO-DOPED WITH Fe3+ AND Bi3+ IONS

2016 ◽  
Vol 23 (02) ◽  
pp. 1550099
Author(s):  
QIONGZHI GAO ◽  
XIN LIU ◽  
WEI LIU ◽  
FANG LIU ◽  
YUEPING FANG ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Dip Coating ◽  
Photocatalytic Properties ◽  
Molar Ratio ◽  
Coating Process ◽  
X Ray ◽  
Co Doped ◽  
Scanning Electron

In this work, the titanium dioxide ([Formula: see text]) nanofilms co-doped with [Formula: see text] and [Formula: see text] ions were successfully fabricated by the sol–gel method with dip-coating process. Methylene blue was used as the target degradation chemical to study the photocatalytic properties affected by different doping contents of [Formula: see text] and [Formula: see text] ions. The samples were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and infrared (IR) spectroscopy. The results indicated that both pure [Formula: see text] nanofilms and single-doped samples possessed the photocatalytic activity in degradation of methylene blue. However, when the nanofilms co-doped with [Formula: see text] and [Formula: see text] ions were fabricated at the molar ratio of 3:1 ([Formula: see text]:[Formula: see text]), they exhibited the best photocatalytic activity after the heat treatment at [Formula: see text]C for 2[Formula: see text]h. The wettability property test indicated that the [Formula: see text] nanofilms co-doped with [Formula: see text] and [Formula: see text] ions in the molar ratio 3:1 owned an excellent hydrophilic property.

Sol-Gel Preparation, Characterization and Photocatalytic Activity of Co Doped Nano-TiO2

2010 ◽  
Vol 177 ◽  
pp. 54-57 ◽  
Author(s):  
Li Na Meng ◽  
Wen Yuan Xu ◽  
Ting Xu
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Sol Gel ◽  
Inhibitory Effect ◽  
Pure Tio2 ◽  
Tio2 Thin Films ◽  
Doped Tio2 ◽  
Co Doping ◽  
Co Doped

Co doped TiO2 nanoparticles and thin films were prepared from Ti(OC4H9)4 by sol-gel method. The influence of Co-doping and its content on the crystallite structure and phase composition of TiO2 was systematically investigated by SEM and XRD, the precursor was analysed by TGA. The photocatalytic activity of nanocomposites was investigated in the photocatalytic degradation of methyl orange. The results indicated that the inhibitory effect of Co-doping on the phase transformation of TiO2 from anatase to rutile receded obviously when the calcination temperature was changed to 650°C from 550°C. Under the ultraviolet light radiation, the favourite Co-doping concentration was 1% and the obtained Co doped TiO2 thin films exhibited higher photocatalytic activity than nanoparticles and pure TiO2 in the photodegradation of methyl orange.

scholarly journals Enhancing the photoactivity of TiO2/SiO2 monolithic catalyst and its reusability for wastewater treatment

2019 ◽  
Vol 268 ◽  
pp. 07005
Author(s):  
Ngoc Diem Trinh Huynh ◽  
Kieu Duyen Vo ◽  
Thao Vy Nguyen ◽  
Minh Vien Le
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Dip Coating ◽  
Molar Ratio ◽  
Coating Process ◽  
Visible Light Region ◽  
Molar Ratios ◽  
Calcination Temperatures ◽  
Light Region

A series of TiO2/SiO2 photocatalysts were successfully synthesized by the sol-gel method. The TiO2/SiO2 monolith was also synthesized by dip-coating process. The crystalline structure of TiO2/SiO2 powders was identified as pure anatase. The photocatalytic activity of the TiO2/SiO2 powders was evaluated by photodegradation of 20 ppm methylene blue (MB) using a 26W lamp which has the wavelength in the visible light region under different Ti: Si molar ratios and calcination temperatures. The TiO2/SiO2 powders which have Ti: Si molar ratio of 85:15 (TS15) and calcined at 550tC showed the highest photodegradation yield of 84 % after 3h irradiation. Furthermore, the 550˚C calcined TS15 monolith performed the MB degradation yield of 88.9 % after 3h irradiation and its photoactivity still remained after 4 recycle times. The results of this study demonstrated that the TS15 monolith photocatalyst has a reasonable efficiency in the degradation of methylene blue, it could be a promising photocatalyst for removal and degradation of organic pollutants.

Influence of Sm3+ and Gd3+ Co-Doping on Photocatalytic Activity of TiO2

2011 ◽  
Vol 239-242 ◽  
pp. 1045-1048
Author(s):  
Xu Dong Lu ◽  
Cheng Zhi Jiang
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Phase Transformation ◽  
Photocatalytic Activity ◽  
Degradation Rate ◽  
Sol Gel ◽  
Nano Particles ◽  
Co Doping ◽  
The Matrix ◽  
Co Doped

Pure TiO2, Sm3+and Gd3+co-doping TiO2have been prepared by sol-gel method and characterized by the techniques such as XRD and SEM. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate Pure TiO2, Sm3+and Gd3+co-doping TiO2photocatalytic activity. The matrix distortion of TiO2increases after co-doping of Sm3+and Gd3+are clearly observed. The results show that co-doping of Sm3+and Gd3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. When the co-doped amounts for Sm3+and Gd3+are 0.1% and 0.2%, its degradation rate reaches 99%.

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