scholarly journals Effect of thermal treatment on the photocatalytic behavior of TiO2 supported on zeolites

2018 ◽  
Vol 42 (14) ◽  
pp. 12001-12007 ◽  
Author(s):  
Kiros Guesh ◽  
Álvaro Mayoral ◽  
Yonas Chebude ◽  
María José López-Muñoz ◽  
Carlos Márquez-Álvarez ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Synthetic Zeolites

Photocatalysts based on TiO2 supported on two different synthetic zeolites (faujasite CBV 760: SiO2/Al2O3 = 60 and mordenite CBV 21A, SiO2/Al2O3 = 20), containing 10 wt% and 40 wt% TiO2 loading, have been synthesized using a sol–gel method without any further calcination.

The effect of thermal treatment conditions employed in sol-gel method on the structure of ZnO thin films

2009 ◽  
Vol 206 (9) ◽  
pp. 2139-2142 ◽  
Author(s):  
Takashi Ehara ◽  
Takafumi Otsuki ◽  
Junya Abe ◽  
Takaaki Ueno ◽  
Masahiro Ito ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Treatment ◽  
Sol Gel ◽  
Zno Thin Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Treatment Conditions

Stabilization of tetragonal phase of nanostructured Fex/ZrO2 system (0 ≤ x ≤ 25) prepared by modified sol-gel method

2022 ◽  
Author(s):  
Abdelaziz Abu El-fadl ◽  
Amna Eltokhey ◽  
A. A. Abu-Sehly ◽  
Amina A. Abozeed
Keyword(s):  
Thermal Treatment ◽  
Tetragonal Phase ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Degree Of Crystallinity ◽  
Gel Method ◽  
Sol Gel Method ◽  
Optical Absorbance ◽  
Single Matrix ◽  
Zro2 System

Abstract In the present study, Fex/ZrO2 (0 ≤ x ≤ 25) nanoparticles were synthesized by a facile modified Sol-Gel method. Stabilization of the tetragonal phase of ZrO2 is studied as a function of both the Fe incorporation ratios and thermal treatment. The Fe incorporation ratios are tested up to the extreme just before FeO and Fe2O3 phases are formed separately. The prepared Fex/ZrO2 nanoparticles XRD analysis depicts the formation of zirconium oxide at different Fe ratios in the nanoscale with an excellent degree of crystallinity in the tetragonal phase. The effect of thermal treatment on stabilizing the tetragonal phase of Fex/ZrO2 nanoparticles is extensively studied. The phase transition to the monoclinic phase is determined as function of Fe incorporation ratios and annealing temperatures. The optical absorbance spectra showed that the optical band gap decreased with increasing Fe ratios without the formation of doping bands which confirms the formation of Fex/ZrO2 single matrix.

scholarly journals The Effect of Thermal Treatment on Conversion to Silica of Silica / Polymethylmethacrylate Hybrid Films Prepared by Sol-Gel Method Using Perhydropolysilazane

2008 ◽  
Vol 33 (4) ◽  
pp. 993-996
Author(s):  
Junko Shimomura ◽  
Hajime Horikawa ◽  
Takashi Ogihara ◽  
Kazumi Kato ◽  
Hisao Suzuki ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Sol Gel ◽  
Hybrid Films ◽  
Gel Method ◽  
Sol Gel Method

Development of Neodymium Oxide (Nd2O3) Doped Nanocomposities Using Sol-Gel Method

2010 ◽  
Vol 159 ◽  
pp. 605-608
Author(s):  
Manisha Devi ◽  
Mukesh Kumar ◽  
A.M. Gaur
Keyword(s):  
Thermal Treatment ◽  
Growth Parameters ◽  
Sol Gel ◽  
Neodymium Oxide ◽  
Optical Microscope ◽  
The Other ◽  
Nano Composites ◽  
Metal Composites ◽  
Gel Method ◽  
Sol Gel Method

In this paper, our aim was to develop the Neodymium oxide (Nd2O3) based nano composites using sol gel method. This work is mainly focused on to study the synthesis of metal composites by sol gel method. We will also observe the morphologies and dimension of neodymium oxide doped nano composites are influenced due to alteration in growth parameters such as different composition or thermal treatment. The structure of the sample prepared was studied using optical microscope. The other objective would be to investigate the synthesis of modem oxide doped nano composites.

Characterization of Nanoscaled TiO2 Produced by Simplified Sol–Gel Method Using Organometallic Precursor

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
Perica Paunović ◽  
Anita Grozdanov ◽  
Andrej Češnovar ◽  
Petre Makreski ◽  
Gennaro Gentile ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Treatment ◽  
Sol Gel ◽  
Rutile Phase ◽  
Gravimetric Analysis ◽  
Titanium Tetraisopropoxide ◽  
Gel Method ◽  
Sol Gel Method ◽  
Organometallic Precursor ◽  
Transmission Electron

This work is concerned with development of sol–gel method for preparation of nanoscaled TiO2 using organometallic precursor—titanium tetraisopropoxide (TTIP) and determination of the present crystalline phases depending on the temperature of further thermal treatment. The characteristic processes and transformations during the thermal treatment were determined by means of thermal gravimetric analysis and/or differential thermal analysis (TGA/DTA) method. The crystalline structure and size of the TiO2 crystallites were analyzed by means of Raman spectroscopy and X-ray powder diffraction (XRPD) method. At 250 °C, cryptocrystalline structure was detected, where amorphous TiO2 is accompanied with crystalline anatase. The anatase crystallite phase is stable up to 650 °C, whereas at higher temperature rutile transformation begins. It was observed that at 800 °C, almost the whole TiO2 is transformed to rutile phase. According to XRPD analysis, the increase of the temperature influences on the increase of the size of the crystalline particles ranging from 6 nm at 250 °C to less than 100 nm at 800 °C. The size and shape of the TiO2 crystalline particles were observed by transmission electron microscopy (TEM). The shape of the studied samples changes from nanospheres (250, 380, and 550 °C) to nanorods (650 and 800 °C). Morphology of the formed TiO2 aggregates was observed by scanning electron microscopy (SEM).

scholarly journals Synthesis of Mn(II)-Loaded TixSi1-xO4 Composite Acting as a Visible-Light Driven Photocatalyst

2015 ◽  
Vol 15 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Misriyani Misriyani ◽  
Eko Sri Kunarti ◽  
Masahide Yasuda
Keyword(s):  
Thermal Treatment ◽  
Visible Light ◽  
Sol Gel ◽  
Ion Concentration ◽  
Molar Ratio ◽  
Titanium Tetraisopropoxide ◽  
Gel Method ◽  
Sol Gel Method ◽  
Visible Light Driven ◽  
Diffuse Reflectance Spectrometry

The synthesis and characterization of Mn-loaded TixSi1-xO4 (x= 0.4-0.8) composites and a preliminary study of an activity testing their ability to work as photocatalysts for the degradation of methylene blue (MB) have been studied. Synthesis was conducted by the sol-gel method at room temperature using tetraethyl orthosilicate, titanium tetraisopropoxide, and manganese(II) chloride as precursors followed by thermal treatment at 500 °C. The characterizations were performed by X-ray diffraction, FT-IR spectrometry, UV-Vis diffuse reflectance spectrometry and a surface area analyzer. The photocatalytic activity test of composites for degradation of MB was carried out in a closed reactor equipped with UV and visible lights. In this test, the effects of ratio of Ti/Si composites, Mn2+ ion concentration, pH, and time of irradiation on the effectiveness of photodegradation of MB were studied. The results indicated that Mn-Ti0.6Si0.4O4 composite could be synthesized through the sol-gel method followed by thermal treatment with a molar ratio of Ti/Si=60/40 and the optimum concentration of manganese was 2.5 wt%. The Mn-Ti0.6Si0.4O4 composite significantly increased the photodegradation of MB at pH 10, with a percent degradation of 84.41% for 30 min under irradiation of visible light. The percent degradation of Ti0.6Si0.4O4 was only 18.23% under irradiation of visible light.

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