scholarly journals Pengaruh Laju Penginjeksian Doping Fluor terhadap Aktivitas Fotokatalis Nanotitania Menggunakan Metode Sol Gel

2020 ◽  
Vol 8 (2) ◽  
pp. 209-218
Author(s):  
Sri Rahayu ◽  
◽  
Posman Manurung ◽  
Roniyus Marjunus ◽  
◽  
...  
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Tween 80 ◽  
Ammonium Fluoride ◽  
Sintered Sample ◽  
Titanium Isopropoxide ◽  
Injection Rate ◽  
Particle Sizes ◽  
Fluorine Doping ◽  
Transmission Electron

The titania synthesis of fluorine doping (F-TiO2) was carried out through the sol-gel method. Titanium isopropoxide (TTIP), tween-80, isopropanol and ammonium fluoride (NH4F) as sources of doping fluorine were used as the main ingredients. This research aimed to study the effect of fluorine doping injection rate using injection pumps on F-TiO2 photocatalyst activity. Four fluorine doping samples were prepared with the respective penetration rate of 0.4 ml / 30 minutes; 0.4 ml / 60 minutes; 0.4 ml / 90 minutes and 0.4 ml / 120 minutes. The titania powder was calcined at 450 oC for 5 hours. The sintered sample was tested for photodegradation of remazol yellow under UV light. Physical characteristics were analyzed using transmission electron microscopy (TEM) and Uv-Vis spectrophotometer. The results of the UV-Vis spectrophotometer showed that the particle size of samples with an injection rate of 0.4 ml / 90 minutes showed higher photocatalyst activity with particle sizes of (14 nm ± 4 nm).

scholarly journals Pengaruh Laju Penginjeksian Doping Sulfur terhadap Aktivitas Fotokatalis Nanotitania Menggunakan Metode Sol Gel

2019 ◽  
Vol 7 (2) ◽  
pp. 223-230
Author(s):  
Delfi Oktavia Amrani ◽  
◽  
Posman Manurung ◽  
Pulung Karo Karo ◽  
◽  
...  
Keyword(s):  
Sol Gel ◽  
Tween 80 ◽  
Titanium Isopropoxide ◽  
Injection Rate ◽  
Raw Material ◽  
Tio2 Photocatalyst ◽  
Sulfur Doping ◽  
Injection Pump ◽  
Transmission Electron ◽  
Doped Titania

Synthesis of sulfur doped titania (S-TiO2) was carried out through sol-gel method. Titanium isopropoxide (TTIP), tween-80, isopropanol and sulfuric acid (H2SO4) as a source of sulfur doping were used as raw material. The aimed of this research is to study the effect of the rate of sulfur doping injection by using an injection pump toward S-TiO2 photocatalyst activity. Four sulfur doping samples were prepared with rate injection of 4 ml/30; 4 ml/60; 4 ml/90 and 4 ml/120 minutes respectively. Titania powder was calcined at temperatur of 450 oC for 5 hours. The sintered samples were tested for photodegradation of remazol yellow under UV irradiation. Physical characteristics were analyzed using transmission electron microscopy (TEM) and UV-Vis Spectrophotometer. The result of the UV-Vis spectrophotometer showed that sample with an injection rate of 4 ml/30 minutes showed higer photocatalyst activity with the particle size is (7,1 nm ± 1,9 nm)

scholarly journals Bactericidal Activity of TiO2on Cells ofPseudomonas aeruginosaATCC 27853

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
J. L. Aguilar Salinas ◽  
J. R. Pacheco Aguilar ◽  
S. A. Mayén Hernández ◽  
J. Santos Cruz
Keyword(s):  
Electron Microscopy ◽  
Pseudomonas Aeruginosa ◽  
Uv Light ◽  
Light Exposure ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Gel Technique ◽  
Short Time

The photocatalytic activity of semiconductors is increasingly being used to disinfect water, air, soils, and surfaces. Titanium dioxide (TiO2) is widely used as a photocatalyst in thin films, powder, and in mixtures with other semiconductors or metals. This work presents the antibacterial effects of TiO2and light exposure (at 365 nm) onPseudomonas aeruginosaATCC 27853. TiO2powder was prepared from a mixture of titanium isopropoxide, ethanol, and nitric acid using a green and short time sol-gel technique. The obtained gel annealed at 450°C was characterized by X-ray diffraction, Raman spectroscopy, ultraviolet-visible spectroscopy, diffuse reflectance, scanning electron microscopy, and transmission electron microscopy. The nanocomposite effectively catalyzed the inactivation ofPseudomonas aeruginosa. Following 90 minutes exposure to TiO2and UV light, logarithm of cell density was reduced from 6 to 3. These results were confirmed by a factorial design incorporating two experimental replicates and two independent factors.

Synthesis and Characterization of SiO2@Y2MoO6:Eu3+ Core–Shell Structured Spherical Phosphors by Sol–Gel Process

2016 ◽  
Vol 16 (4) ◽  
pp. 3914-3920 ◽  
Author(s):  
G. Z Li ◽  
F. H Liu ◽  
Z. S Chu ◽  
D. M Wu ◽  
L. B Yang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Annealing Temperature ◽  
Uv Light ◽  
Sol Gel ◽  
Spherical Shape ◽  
Core Shell ◽  
X Ray ◽  
Transmission Electron ◽  
Sol Gel Process ◽  
Average Size

SiO2@Y2MoO6:Eu3+ core–shell phosphors were prepared by the sol–gel process. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectra (EDS), transmission electron microscopy (TEM), photoluminescence (PL) spectra as well as kinetic decays were used to characterize the resulting SiO2@Y2MoO6:Eu3+ core–shell phosphors. The XRD results demonstrated that the Y2MoO6:Eu3+ layers on the SiO2 spheres crystallized after being annealed at 700 °C and the crystallinity increased with raising the annealing temperature. The obtained core–shell phosphors have spherical shape with narrow size distribution (average size ca. 640 nm), non-agglomeration, and smooth surface. The thickness of the Y2MoO6:Eu3+ shells on the SiO2 cores could be easily tailored by varying the number of deposition cycles (70 nm for four deposition cycles). The Eu3+ shows a strong PL emission (dominated by 5D0–7F2 red emission at 614 nm) under the excitation of 347 nm UV light. The PL intensity of Eu3+ increases with increasing the annealing temperature and the number of coating cycles.

scholarly journals Nanocrystalline TiO2 Powder Prepared by Sol-Gel Method for Dye-Sensitized Solar Cells

2016 ◽  
Vol 61 (2) ◽  
pp. 833-836 ◽  
Author(s):  
L. A. Dobrzański ◽  
M. M. Szindler ◽  
M. Szindler ◽  
K. Lukaszkowicz ◽  
A. Drygała ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Nanocrystalline Structure ◽  
Titanium Isopropoxide ◽  
Thin Layers ◽  
Nanocrystalline Tio2 ◽  
Transmission Electron ◽  
Dioxide Powder ◽  
Titanium White

Abstract In this study titanium dioxide nanopowder has been manufactured and examined. Nanocrystalline TiO2 powder has been obtained by hydrolysis and peptization of a solution of titanium isopropoxide and isopropanol. Subsequently, produced powder has been subjected to structural analysis by using a transmission electron microscope, X-ray diffractometer, and Raman spectrometer. For comparison purposes, a commercially available titanium dioxide powder (i.e. titanium white) was also used. Thin layers have been made from this powder and further have been examined by using a UV/VIS spectrometer. Completed research shows the nanocrystalline structure of obtained layers and their good properties such as absorbance at the range of wavelength equal 200 - 1000 nm.

scholarly journals Effective Photocatalytic Degradation of Nitrobenzene by Magnetite Modified Titania Composite

2021 ◽  
Vol 33 (6) ◽  
pp. 1319-1324
Author(s):  
E.S. Kunarti ◽  
R. Roto ◽  
S. Sutarno ◽  
I.S. Budi ◽  
M. Mardiansyah
Keyword(s):  
Reaction Rate ◽  
Uv Light ◽  
Sol Gel ◽  
Solid Material ◽  
Reaction Rate Constant ◽  
Magnetic Photocatalyst ◽  
Uv Light Irradiation ◽  
Transmission Electron ◽  
Uv Visible ◽  
Co Precipitation

Magnetic photocatalyst of magnetite modified titania composite Fe3O4/TiO2 was prepared by co-precipitation and sol-gel methods followed by calcination at 450 ºC. The produced material was confirmed by XRD, FTIR spectrophotometer, vibrating sample magnetometer and transmission electron microscope. The solid material was tested as a photocatalyst for degradation of nitrobenzene under UV light irradiation. The progress of degradation of nitrobenzene was monitored by using a UV-visible spectrophotometer. The photodegradation of nitrobenzene could be best realized at a medium pH of 7 and 120 min of irradiation. The reaction rate constant of nitrobenzene degradation catalyzed by TiO2 and Fe3O4/TiO2 solids were found to be 0.0058 min-1 and 0.0092 min-1, respectively. The photocatalyst was recoverable by use of a magnetic bar and reusable.

scholarly journals REMOVAL OF NORFLOXACIN BY TiO2-SBA-15 PHOTOCATALYST

2020 ◽  
Vol 58 (3A) ◽  
pp. 13
Author(s):  
Nguyễn Thị Thu Trang ◽  
Trần Quang Vinh ◽  
Nguyễn Thành Đồng ◽  
Phạm Tuấn Linh ◽  
Nguyễn Viết Hoàng ◽  
...  
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Surface Areas ◽  
Pluronic P123 ◽  
Adsorption Capacities ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
Adsorption Desorption ◽  
Synthesized Materials

Ordered SBA-15 mesoporous silica support was synthesized by a sol-gel method using triblock copolymer Pluronic P123 and immobilized with different amounts of photocatalyst TiO2. The synthesized composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and N2 adsorption-desorption isotherms. The synthesized materials possessed specific surface areas SBET of 768 m2/g, 544 m2/g, 421 m2/g and 333 m2/g at the TiO2:SiO2 ratio of 0, 0.25, 1.0 and 5.0, respectively. The adsorption capacities and photocatalytic activities under UV light irradiation of these materials were evaluated for Norfloxacin degradation. Experimental results indicate that the highest activity was observed on the sample with TiO2:SiO2 ratio of 1.

Photo-Degradation of Acid Red 18 by Using TiO2/SO42- Nanoparticles under UV Light

2012 ◽  
Vol 189 ◽  
pp. 52-57 ◽  
Author(s):  
Jian Feng Wang ◽  
Jin Hai Zhao ◽  
Xue Xue Liu ◽  
Shou Heng Zhang ◽  
Dong Yan Wei ◽  
...  
Keyword(s):  
Uv Light ◽  
Irradiation Time ◽  
Sol Gel ◽  
Pure Titanium ◽  
Titanium Isopropoxide ◽  
Hydrolysis Rate ◽  
Bet Surface Area ◽  
Solution Ph ◽  
Photo Degradation ◽  
Degradation Temperature

Photocatalyst TiO2/SO42- nanoparticles were synthesized by sol-gel method via hydrolysis of pure titanium isopropoxide in n-propanol and acetylacetone solution. The hydrolysis rate and condensation rate of titanium isopropoxide were controlled by concentrated sulfuric acid. Its catalytic activities on the photo-degradation of acid red 18 which is acid azo dyes were studied experimentally and theoretically. The catalysts were characterized by XRD (X-ray diffraction), IR (infrared radiation), BET surface area and SEM (scanning electron microscope). The effects of various catalytic degradation factors of nanocrystalline TiO2/SO42- were discussed in the present paper, which included solution pH, initial concentration of acid red 18, UV irradiation time and the reaction temperature. The results showed that the photo-catalytic activity of this material was obvious significantly when pH is 7.0; degradation temperature is 25 °C and irradiation time is 90 minutes for different concentration acid red 18 solutions.

scholarly journals Obtaining and Characterization of TiO2-GO Composites for Photocatalytic Applications

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
D. K. Calvo Ramos ◽  
M. Vega González ◽  
R. A. Esparza Muñóz ◽  
J. Santos Cruz ◽  
F. J. De Moure-Flores ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Uv Radiation ◽  
Uv Light ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Transmission

Titanium dioxide (TD) and graphene oxide (GO) were synthesized by sol-gel and improved Hummers method, respectively. This study shows the results of the incorporation through four different conditions (sol-gel, sol-gel and ultrasonic, annealed, and UV radiation, C1 to C4, respectively). It was observed that a homogeneous incorporation of TD on sheets of GO was obtained satisfactorily. The composites of TiO2/GO were characterized using different techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDS), Raman spectroscopy, and infrared spectroscopy (IR). The photocatalytic activity of the composites was determined from the degradation of the dye azo tartrazine using UV and solar radiation. The best incorporation of TD nanoparticles on GO was obtained with condition C3 (thermal incorporation method) at a temperature of 65°C. This shows a uniformity in the size and shape of the TD as well as an excellent adherence to the sheet of GO. This addition is accomplished by ionic bonding in the presence of electrostatic Coulomb forces. The C3 composite degraded the tartrazine dye using UV radiation and sunlight. With the latter, the degradation time was three times faster than using UV light.

scholarly journals Lanthanum Doped Strontium Titanate Nanomaterial for Photocatalytic and Supercapacitor Applications

2020 ◽  
Vol 32 (8) ◽  
pp. 2013-2020 ◽  
Author(s):  
V.V. Deshmukh ◽  
H.P. Nagaswarupa ◽  
C.R. Ravikumar ◽  
M.R. Anil Kumar ◽  
T.R. Shashi Shekhar ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Malachite Green ◽  
Strontium Titanate ◽  
Uv Light ◽  
Sol Gel ◽  
Galvanostatic Charge ◽  
X Ray ◽  
Transmission Electron ◽  
20 Nm ◽  
Charge Discharge

We report the synthesis of lanthanum doped strontium titanate (Sr1-xLaxTiO3,x=0.1) by sol-gel method. The physical properties of the as-synthesized sample were systematically studied through X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDAX). Diffraction peaks in XRD supported the cubic formation of perovskite-type crystal structure. The image analysis of nanomaterial by SEM and TEM techniques disclosed aggregates of nanoparticles with grain size about 20 nm. The study by UV-DRS exposed the band energy gaps (Eg) of 3.4 eV for strontium titanate nanoparticles, respectively. The degradation studies for three days were carried out for three dyes. Malachite green and rhodamine blue, strontium titanate nanoparticles showed utmost photocatalytic activity for rhodamine blue under UV light irradiation (from 0 to 80 min) as compared to malachite green. Properties of electrochemistry were looked into by cyclic voltammetry and galvanostatic charge/discharge in 1M KCl electrolyte. The Sr0.9La0.1TiO3 electrode displayed maximal specific capacitance of 306.74 F g-1 at current 1mA from galvanostatic charge-discharge curve. The rare earth doped perovskite Sr0.9La0.1TiO3 nanomaterial exhibited increased surface area with superior supercapacitance property.

Transmission Electron Microscopy Study of the Porous Structure of Aluminas Synthesized by Non-Ionic Surfactant Templating Route

2003 ◽  
Vol 68 (10) ◽  
pp. 1937-1948 ◽  
Author(s):  
Isabel Díaz ◽  
Verónica González-Peña ◽  
Carlos Márquez-Alvarez ◽  
Joaquín Pérez-Pariente
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Chemical Modification ◽  
Porous Structure ◽  
Sol Gel ◽  
Aqueous Media ◽  
Ammonium Fluoride ◽  
Ionic Surfactant ◽  
Synthesis Conditions ◽  
Transmission Electron

Organized mesoporous and microporous aluminas have been synthesized by a sol-gel route in non-aqueous media using poly(oxyethylene) block polymers as directing agents. Gel compositions adjusted to obtain direct micelles (in 1,4-dioxane solution) and reverse micelles (in cyclohexane solution) were tested. The influence of synthesis conditions, such as temperature, solvent, use of additives or chemical modification of the precursor, on the alumina porous structure has been analysed by transmission electron microscopy (TEM). Mesoporous aluminas with a pore structure originated by the cross-linking of corrugated oxide-hydroxide platelets of nanometric size were obtained using aluminum sec-butoxide as precursor. The addition of ammonium fluoride or amines to the synthesis gel, as well as higher calcination temperatures, caused a decrease in the surface area due to the condensation of the crystallites into a dense porous structure composed of small polycrystalline agglomerates. Microporous aluminas with higher density and a disordered but isotropic porous structure were obtained by chemical modification of the alkoxide precursor with chelating agents such as ethyl acetoacetate or triethanolamine.

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