scholarly journals Preparation and Characterization of Ni-Doped Materials for Photocurrent and Photocatalytic Applications

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Ibram Ganesh ◽  
A. K. Gupta ◽  
P. P. Kumar ◽  
P. S. C. Sekhar ◽  
K. Radha ◽  
...  
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Measurement Techniques ◽  
Kinetic Studies ◽  
Dip Coating ◽  
Bet Surface Area ◽  
Flat Band ◽  
Bandgap Energy ◽  
Degradation Reaction ◽  
Photocurrent Measurement

Different amounts of Ni-doped TiO2( to 10%) powders and thin films were prepared by following a conventional coprecipitation and sol-gel dip coating techniques, respectively, at 400 to 800°C, and were thoroughly characterized by means of XRD, FT-IR, FT-Raman, DRS, UV-visible, BET surface area, zeta potential, flat band potential, and photocurrent measurement techniques. Photocatalytic abilities of Ni-doped TiO2powders were evaluated by means of methylene blue (MB) degradation reaction under simulated solar light. Characterization results suggest that as a dopant, Ni stabilizes TiO2in the form of anatase phase, reduces its bandgap energy, and adjusts its flat band potentials such that this material can be employed for photoelectrochemical (PEC) oxidation of water reaction. The photocatalytic activity and photocurrent ability of TiO2have been enhanced by doping of Ni in TiO2. The kinetic studies revealed that the MB degradation reaction follows the Langmuir-Hinshelwood first-order reaction relationship.

Enhancement of Photocatalytic Activity of TiO2 Thin Film Using Diethanolamine and MCM-41

2012 ◽  
Vol 712 ◽  
pp. 117-131 ◽  
Author(s):  
Ananta Kumar Karki ◽  
Nurak Grisdanurak ◽  
Siriluk Chiarakorn
Keyword(s):  
Thin Film ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
Anatase Phase ◽  
Sol Gel ◽  
Dip Coating ◽  
Bet Surface Area ◽  
Mcm 41

TiO2thin film enhanced by diethanolamine (DEA) and MCM-41 (D-TiO2/MCM-41) was successfully synthesized by sol-gel dip coating technique on glass slides. The roles of DEA and MCM-41 on physical and photocatalytic characteristics of the films were studied using various techniques such as x-ray defraction (XRD), fourier transform infrared spectroscopy (FTIR), ultra violet-visible (UV-Vis) spectrometry, Brunauer, Emmett and Teller (BET) surface area analysis and field emission scanning electron microscope (FESEM). The XRD results showed that the thin film contained almost 100% anatase phase and the crystal size of TiO2was in the range of 4-8 nm. The FTIR spectra indicated the formation of Ti-O-Si and Si-O-Si linkages due to interaction of TiO2and MCM-41. The surface area of TiO2was increased significantly when MCM-41 was added. The use DEA and MCM-41 caused slight increase in visible light absorption but UV absorption was decreased. The photocatalytic reactivity of the thin film was tested by photocatalytic degradation of methylene blue under visible light. The addition of DEA as a nitrogen source was beneficial not only for obtaining stable/smooth surface of the thin film but also for enhancing photocatalysis of methylene blue by preventing charge carrier recombination. While MCM-41 played important functions in improving porosity and hydrophilicity of the film. The photodegradation of methylene blue was obtained up to 35% of its original concentration when 1M DEA and 0.3M MCM-41 were incorporated in TiO2thin film. The overall enhancement of photocatalytic activity of the film was a result of nitrogen doping, increased surface area as well as increased hydrophilicity provided by MCM-41.

scholarly journals Preparation and characterization of Fe-doped TiO2 powders for solar light response and photocatalytic applications

2012 ◽  
Vol 6 (1) ◽  
pp. 21-36 ◽  
Author(s):  
Ibram Ganesh ◽  
Polkampally Kumar ◽  
Abhishek Gupta ◽  
Panakati Sekhar ◽  
Kalathur Radha ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Diffuse Reflectance Spectroscopy ◽  
Anatase Phase ◽  
Kinetic Studies ◽  
Band Gap Energy ◽  
Solar Light ◽  
Bet Surface Area ◽  
Flat Band ◽  
Photocatalytic Ability ◽  
Doped Tio2

Different amounts of Fe-doped TiO2 (with 0.1 to 10 wt.% Fe) powders were prepared at temperatures in the range of 400 and 800?C following a conventional co-precipitation technique and were thoroughly characterized by means of X-ray diffraction (XRD), Fourier-transform infrared (FT-IR), Fourier-transform Raman (FT-Raman), diffuse reflectance spectroscopy (DRS), BET surface area, zeta potential and flat band potential measurements. Photocatalytic ability of Fe-doped TiO2 powders was evaluated by means of methylene blue (MB) degradation experiments conducted under the irradiation of simulated solar light. Characterization results suggested that as a dopant Fe stabilized TiO2 in the form of anatase phase, reduced its band gap energy and adjusted its flat band potentials in such a way that these powders can be employed for photoelectrolysis of water into hydrogen and oxygen in photoelectrochemical (PEC) cells. The 0.1 wt.% Fe-doped TiO2 exhibited highest activity in the photocatalytic degradation of MB. The kinetic studies revealed that the MB degradation reaction follows the Langmuir-Hinshelwood first order reaction rate.

Nanocrystalline Thin Films TiO2 Prepared by Different Concentration of Organic Acid and their Photocatalytic Activity

2011 ◽  
Vol 233-235 ◽  
pp. 363-368
Author(s):  
Nitikarn Fangern ◽  
Sudjit Sanguanruang ◽  
Chamorn Chawengkijwanich
Keyword(s):  
Thin Films ◽  
Surface Area ◽  
Anatase Phase ◽  
Sol Gel ◽  
Dip Coating ◽  
Bet Surface Area ◽  
Glass Substrates ◽  
Vis Spectroscopy ◽  
Coating Method ◽  
Dip Coating Method

In this work, TiO2thin films were deposited on borosilicate glass substrates by sol-gel dip coating method and calcined at 500 °C for 15 min(heating rate3°C/min). The TiO2sol was prepared by fixing concentration of titaniumtetraisopropoxide(TTIP), TritonX-100 surfactant, ethanol and conc hydrochloric acid but amounts of acetyl acetone (Acac ) were various as 4, 6 and 8 mole respectively. After calcination process, all the TiO2thin films were homogeneous and transparent. Several techniques , such as X-ray diffraction (XRD), UV-Vis spectroscopy, Environment Scanning Electron Microscope (E-SEM), atomic force microscopy (AFM) and BET surface area analysis were used to characterize the prepared TiO2thin film. Spectra of XRD showed that the crystal structure was anatase phase with the crystal sizes of 9.05 – 12.57 nm. According to BET surface area analysis, the surface area , pore volume and pore size of TiO2were in the range of 66.35-82.53 m2/gm , 0.1194-0.1301 cm3/g and 57-71 A0respectively. The photodegradation of Reactive Blue 19 by the prepared TiO2thin films showed decomposition rate of 97.58% , 95.03 % and 94.48% for the thin films prepared by using 4, 6 and 8 mole AcAc respectively.

scholarly journals Synthesis and Characterization of TiO2/SiO2 Monoliths as Photocatalysts on Methanol Oxidation

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Rigoberto Regalado-Raya ◽  
Rubí Romero-Romero ◽  
Osmín Avilés-García ◽  
Jaime Espino-Valencia
Keyword(s):  
Thin Film ◽  
Methanol Oxidation ◽  
Immersion Time ◽  
Film Formation ◽  
Anatase Phase ◽  
Sol Gel ◽  
Packed Bed ◽  
Dip Coating ◽  
Packed Bed Reactor ◽  
Titanium Butoxide

Photocatalytic materials based on silica-titania (SiO2-TiO2) were synthesized by sol-gel and dip-coating method. TEOS and titanium butoxide were used as precursors of the silica-titania, respectively. A thin film with anatase phase was obtained on the surface of the support. The effect of variables as dispersion mechanism, immersion time, and number of treatment cycles were studied. The materials were characterized using X-ray diffraction, scanning electron microscopy, energy dispersion scanning, and N2 adsorption-desorption. The highest crystallinity of TiO2 on silica, high specific surface area in TiO2-SiO2 materials, and thin film formation were obtained by using a stirring plate and minimum immersion time. The so synthesized catalyst allowed the production of formaldehyde from the photocatalyzed methanol oxidation in a packed-bed reactor.

The Doping of Ag+ Enhanced the Antibiocorrosive Effect of Titania in Seawater under Visible Light

2009 ◽  
Vol 79-82 ◽  
pp. 1103-1106
Author(s):  
Hai Xia Hong ◽  
Yan Sheng Yin ◽  
Hong Feng Wang ◽  
Shou Gang Chen ◽  
Tao Liu ◽  
...  
Keyword(s):  
Tio2 Film ◽  
Anatase Phase ◽  
Sol Gel ◽  
Dip Coating ◽  
Tio2 Thin Films ◽  
Sulfate Reducing ◽  
Potentiodynamic Polarization Curves ◽  
Coating Method ◽  
Dip Coating Method ◽  
Reducing Bacteria

Sol-gel TiO2 thin films undoped and doped with Ag-ions have been formed on 304ss by dip-coating method respectively. The Ag/TiO2 films are compact and have anatase phase with stable crystal structure and have a thickness of 50 nm approximately. The bactericidal rate of the Ag/TiO2 film against sulfate-reducing bacteria (SRB) strains reaches 97.1% when doping Ag+ with a percentage of 3%. The analysis of potentiodynamic polarization curves illustrates Ag/TiO2 film decreases the corrosion rate obviously.

scholarly journals Application of Novel C-TiO2-CFA/PAN Photocatalytic Membranes in the Removal of Textile Dyes in Wastewater

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 909
Author(s):  
Amkelwa Mpelane ◽  
David M. Katwire ◽  
Henry H. Mungondori ◽  
Pardon Nyamukamba ◽  
Raymond T. Taziwa
Keyword(s):  
Anatase Phase ◽  
Coal Fly Ash ◽  
Sol Gel ◽  
Environmental Water ◽  
Textile Dyes ◽  
Bet Surface Area ◽  
Carbon Doped ◽  
Phase Inversion Technique ◽  
Golden Yellow ◽  
Sol Gel Synthesis

The existence of dye effluent in environmental water bodies is becoming a growing concern to environmentalists and civilians due to negative health effects. In this study, a novel poly(acrylonitrile)-membrane-supported carbon-doped titanium dioxide–coal fly ash nanocomposite (C-TiO2-CFA/PAN) was prepared and evaluated in the removal of textiles dyes (methyl orange and golden yellow) in water. The C-TiO2-CFA nanocomposite was prepared via sol-gel synthesis and immobilized on PAN membrane prepared via phase inversion technique. The photocatalyst was characterized by FTIR, XRD, BET surface area analysis, SEM, EDX, and DRS. FTIR analysis confirmed the existence of the expected functional groups, and XRD revealed that the C-TiO2 was predominantly in the anatase phase, which exhibited the highest photocatalytic activity. The optimum C-TiO2-CFA photocatalyst load on the PAN membrane was 2% w/w, and it achieved degradation efficiencies of 99.86% and 99.20% for MO and GY dyes, respectively, at pH 3.5, using a dye concentration of 10 ppm, under sunlight irradiation, in 300 min. The novel 2% C-TiO2-CFA/PAN photocatalytic membrane proved to be very effective in the removal of textile dyes’ water. Three reusability cycles were carried out, and no significant changes were observed in the photocatalytic efficiencies. Immobilization on PAN membrane allowed easy recovery and reuse of the photocatalyst.

scholarly journals Photocatalytic Antibacterial Performance of Glass Fibers Thin Film Coated with N-DopedSnO2/TiO2

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Peerawas Kongsong ◽  
Lek Sikong ◽  
Sutham Niyomwas ◽  
Vishnu Rachpech
Keyword(s):  
Glass Fibers ◽  
Anatase Phase ◽  
Sol Gel ◽  
Composite Films ◽  
Salmonella Typhi ◽  
Dip Coating ◽  
Water Disinfection ◽  
E Coli ◽  
Antibacterial Performance ◽  
Coating Methods

Both N-doped and undoped thin films of 3SnO2/TiO2composite were prepared, by sol-gel and dip-coating methods, and then calcined at 600°C for 2 hours. The films were characterized by FTIR, XRD, UV-Vis, SEM, and XPS, and their photocatalytic activities to degrade methylene blue in solution were determined, expecting these activities to correlate with the inactivation of bacteria, which was confirmed. The doped and undoped films were tested for activities against Gram-negativeEscherichia coli(E. coli) andSalmonella typhi(S. typhi), and Gram-positiveStaphylococcus aureus(S. aureus). The effects of doping on these composite films included reduced energy band gap, high crystallinity of anatase phase, and small crystallite size as well as increased photocatalytic activity and water disinfection efficiency.

Preparation and Characterization of Activated Carbon Fiber Supported Nano-TiO2

2012 ◽  
Vol 503-504 ◽  
pp. 646-649
Author(s):  
Xiao Ling Guo ◽  
Xiang Dong Wang ◽  
De Ping Ben
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Surface Area ◽  
Anatase Phase ◽  
Sol Gel ◽  
Activated Carbon Fiber ◽  
Bet Surface Area ◽  
Tetrabutyl Titanate ◽  
Nano Tio2 ◽  
Mean Size

Nano-TiO2 powders were synthesized by a sol-gel method using tetrabutyl titanate as the precursor, and then the composites of ACF(activated carbon fiber) supported nano-TiO2 was prepared by impregnating method. Tests of the amount of loaded TiO2 showed that three impregnating times was adequate. The Nano-TiO2 powders and composites were characterized by XRD, SEM, and BET surface area method. XRD tests showed that nano-TiO2 powders prepared by this way are anatase phase, and the mean size of the particles is about 11.5nm, when the calcination temperature is 673K. BET results showed that compared with original ACF, the surface area of the composites decreased slightly, indicating the impregnating process did not change the porous structure of original ACF. SEM result indicated that most of the nano-TiO2 particles as the size of 10-20nm were homogeneously dispersed on the surface of ACF.

scholarly journals The synthesis of transparent TiO2 photoelectrodes assisted by rheological agent (triton x-100, PVP and F-127) for dye sensitized solar cells

2018 ◽  
Vol 83 (2) ◽  
pp. 181-198 ◽  
Author(s):  
Miranda Reyes ◽  
Ramírez Morales ◽  
Romo Carrillo ◽  
Murillo García ◽  
la de ◽  
...  
Keyword(s):  
Solar Cells ◽  
Anatase Phase ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Average Energy ◽  
Dip Coating ◽  
Dye Sensitized ◽  
Vis Spectroscopy ◽  
Triton X ◽  
Sensitized Solar Cells

In this work, the transparent TiO2 photoelectrodes have been synthesized by the sol?gel method and the dip-coating technique, incorporating three rheological agents as porous template ? Triton X-100, polivinilpirrolidone (M.W. 10000) and Pluronic F-127 into the TiO2 sol for the application in dye- -sensitized solar cells. Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, m-lines and UV?Vis spectroscopy analyses were carried out to examine the chemical composition, structure, morphology, thickness and optical transmittance of the TiO2 photoelectrodes. Impedance spectroscopy was carried out to analyze the cells? behaviour. An average energy conversion efficiency of 1.04 % was achieved using triton as a modifier of the transparent TiO2 film, obtaining a thickness about 1.21 ?m, a crystallite size of about 7 nm in the anatase phase and the porosity of about 53.4 %. Triton proved to be efficient for obtaining transparent and porous semiconductor films, while increasing the photoelectrochemical device?s performance.

scholarly journals TiO2 waveguides thin films prepared by sol-gel method on glass substrates with and without ZnO underlayer

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Y. Bouachiba ◽  
A. Taabouche ◽  
A. Bouabellou ◽  
F. Hanini ◽  
C. Sedrati ◽  
...  
Keyword(s):  
Thin Films ◽  
Glass Sample ◽  
Anatase Phase ◽  
Sol Gel ◽  
Single Mode ◽  
Dip Coating ◽  
Glass Substrates ◽  
Diffraction Peaks ◽  
Xrd Patterns

AbstractTiO2 thin films have been deposited on glass substrates with and without ZnO underlayer by sol-gel dip coating process. XRD patterns show the formation of anatase phase with the diffraction lines (1 0 1) and (2 0 0) in TiO2/glass sample. In TiO2/(ZnO/glass) sample, TiO2 is composed of anatase phase with the diffraction line (2 0 0) but the diffraction peaks of ZnO wurtzite are also well-defined. The determination of the refractive index and the thickness of the waveguiding layers has been performed by m-lines spectroscopy. The thickness of TiO2 thin films deduced by Rutheford Backscattering Geometry (RBS) agrees well with that obtained by m-lines spectroscopy. TiO2/glass sample exhibits one guided TE0 and TM0 polarized modes. In TiO2/(ZnO/glass) sample, only, TE0 single mode has been excited due to cutoff condition.

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