A sol–gel combustion synthesis method for TiO2 powders with enhanced photocatalytic activity

2010 ◽  
Vol 57 (1) ◽  
pp. 76-85 ◽  
Author(s):  
Shyan-Lung Chung ◽  
Ching-Mei Wang
Keyword(s):  
Photocatalytic Activity ◽  
Combustion Synthesis ◽  
Sol Gel ◽  
Synthesis Method ◽  
Gel Combustion

Optimized Preparation of Fe2O3/Al2O3 Composite with Sol-Gel Combustion Synthesis Method Based on Orthogonal Experimental Design

2011 ◽  
Vol 341-342 ◽  
pp. 215-220
Author(s):  
Bao Wen Wang ◽  
Chuan Chang Gao ◽  
Hai Bo Zhao ◽  
Chu Guang Zheng
Keyword(s):  
Experimental Design ◽  
Combustion Synthesis ◽  
Ignition Temperature ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Synthesis Method ◽  
Influential Factor ◽  
Molar Ratio ◽  
Orthogonal Experimental Design ◽  
Gel Combustion

Fe2O3/Al2O3 composite at the mass ratio of 3:2 was prepared by sol-gel combustion synthesis using urea as fuel. The optimized preparation parameters were determined by the robust orthogonal experimental design (OED) method. Standard L9(34) orthogonal array was adopted, and the four factors were determined as the molar ratio of oxidizer nitrates to fuel urea Ф, relative amount of the deionized water added Rw, ignition temperature and sintering temperature. Range analysis of the relative importance of those four factors on the mean weight loss rate for the reduction of synthesized Fe2O3/Al2O3 with 50 vol% H2 indicated that the most influential factor was Ф, sintering temperature, Rw and ignition temperature in the descending order. And the optimized preparation parameters for Fe2O3/Al2O3 composite were Ф=1, Rw=7.5, ignition and sintering temperatures stabilized as 600°C and 950°C,respectively. Finally, the reaction characteristics of Fe2O3/Al2O3 prepared by SGCS and the other two reference methods (including sol-gel method and mechanical mixing method) were compared and the results verified that the optimized SGCS was the best option to synthesize Fe2O3/Al2O3 composite with good reaction performance.

Preparation of CoFe2O4 Nanocrystallite by Sol-Gel Combustion Synthesis and Evaluation of its Reaction Performance

2011 ◽  
Vol 341-342 ◽  
pp. 63-67 ◽  
Author(s):  
Bao Wen Wang ◽  
Chuan Chang Gao ◽  
Hai Bo Zhao ◽  
Chu Guang Zheng
Keyword(s):  
Combustion Synthesis ◽  
Sol Gel ◽  
Synthesis Method ◽  
Xrd Analysis ◽  
Scanning Calorimetry ◽  
Air Atmosphere ◽  
Metal Nitrates ◽  
Gel Combustion ◽  
Temperature Programmed ◽  
Sintering Resistance

Sol-gel combustion synthesis method was adopted to prepare nano-sized CoFe2O4 using urea as fuel. The as-synthesized CoFe2O4 powders were characterized through such experimental means as Fourier transform infrared spectroscopy (FTIR), TG (thermogravimetric)–DSC (differential scanning calorimetry), X-ray diffraction (XRD), field-scanning electron microscopy (FSEM). FTIR analysis and XRD analysis revealed that the dried CoFe2O4 gel was formed by the coordination of metal with O, and consisted of various phases through the hydrolysis of urea and metal nitrates along with the coordination of the various groups produced. And then, TG-DSC analysis of the dried CoFe2O4 gel under air atmosphere indicated that there are two remarkable exothermic reactions occurring, related to the redox reactions between urea and nitrates used, and as-synthesized CoFe2O4 was porous due to the emission of large amount of gases during preparation. Finally, three cycles of temperature-programmed reduction (TPR) coupled with temperature-programmed oxidization (TPO) tests were conducted on the AutoChem 2920 system to show the good reaction and sintering-resistance performance for the synthesized CoFe2O4.

Sol-gel Combustion Synthesis of Merwinite and its Biomedical Applications

2021 ◽  
pp. 130108
Author(s):  
Subhashree Praharaj ◽  
Senthil Kumar Venkatraman ◽  
R. Vasantharaman ◽  
Sasikumar Swamiappan
Keyword(s):  
Combustion Synthesis ◽  
Biomedical Applications ◽  
Sol Gel ◽  
Gel Combustion

Sol–gel (combustion) synthesis and characterization of different alkaline earth metal (Ca, Sr, Ba) stannates

2012 ◽  
Vol 64 (3) ◽  
pp. 643-652 ◽  
Author(s):  
Andrius Stanulis ◽  
Simas Sakirzanovas ◽  
Marlies Van Bael ◽  
Aivaras Kareiva
Keyword(s):  
Combustion Synthesis ◽  
Alkaline Earth ◽  
Sol Gel ◽  
Earth Metal ◽  
Synthesis And Characterization ◽  
Alkaline Earth Metal ◽  
Gel Combustion

La and Co substituted M-type barium ferrites processed by sol–gel combustion synthesis

2013 ◽  
Vol 48 (11) ◽  
pp. 4449-4453 ◽  
Author(s):  
Wangchang Li ◽  
Xiaojing Qiao ◽  
Mingyu Li ◽  
Ting Liu ◽  
H.X. Peng
Keyword(s):  
Combustion Synthesis ◽  
Sol Gel ◽  
Gel Combustion ◽  
Barium Ferrites

Photocatalytically Active Cotton Fabrics Produced with Anatase Synthesized Using a Low-Temperature Sol-Gel Process

2018 ◽  
Vol 762 ◽  
pp. 408-412
Author(s):  
Raivis Eglītis ◽  
Gundars Mežinskis
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Sol Gel ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Sol Gel Process ◽  
Anatase Nanoparticles ◽  
Pre Treatment

In this work two different hydrosols were used to impregnate a commercially available cotton fabric with anatase nanoparticles to give it photocatalytic activity. To increase the activity, different pre-treatment methods were applied. The nanoparticle size was determined using dynamic light scattering and x-ray diffraction and the fabrics were examined using scanning electron microscopy. Photocatalytic activity was measured using the degradation of methyl-orange while irradiating the samples with UV light. The synthesis method allowed to produce anatase with an average particle size of 32 to 37 nm depending on the synthesis method used.

Characteristics and Photocatalytic Activity of Sm Doped ZnO Nanoparticles

2019 ◽  
Vol 799 ◽  
pp. 179-184 ◽  
Author(s):  
Pavels Rodionovs ◽  
Dzidra Jankovica ◽  
Jānis Grabis
Keyword(s):  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Zno Nanoparticles ◽  
Sol Gel ◽  
Spherical Shape ◽  
Order Rate Constant ◽  
X Ray Diffraction ◽  
First Order ◽  
Microwave Assisted ◽  
Gel Combustion

Sm2O3/ZnO nanoparticles were prepared via microwave-assisted hydrothermal and sol-gel combustion synthesis. Characteristics of obtained samples were compared in dependence of Sm2O3 content and calcination temperature. Prepared nanostructures were characterized with scanning electron microscopy and X-ray diffraction. Nanoparticles prepared via microwave-assisted hydrothermal and sol-gel method have flower-like and spherical shape respectively. The photocatalytic activity of samples under solar light simulated illumination was found to be affected by content of Sm2O3, calcination temperature and preparation method. The first-order rate constant of MB solution degradation of samples prepared via microwave-assisted hydrothermal method approximately three times exceeds that of sol-gel samples.

Sol-Gel Combustion Synthesis of Silica/ Carbon Black Pigment

2012 ◽  
Vol 554-556 ◽  
pp. 636-639
Author(s):  
Qi Fu Bao ◽  
Wei Xia Dong ◽  
Qi Bing Chang ◽  
Jian Er Zhou
Keyword(s):  
High Temperature ◽  
Carbon Black ◽  
Combustion Synthesis ◽  
Raw Materials ◽  
Sol Gel ◽  
Black Pigment ◽  
Prepared Sample ◽  
Gel Combustion ◽  
Combustion Technique

A green silicon-containing carbon black pigment was synthesized via a sol-geo combustion technique using TEOS and black ink as raw materials. The obtained black pigment was characterized by XRD, TEM and UV-vis absorption spectrophotometer. The results show that the silicon coated with carbon black pigment can be formed at pH ≥ 2 and the black pigment does not change its color after calcinations at 1300 °C in air implying the carbon black is coated completely with SiO2. When pH is 4, the properties of as-prepared sample are similar with the conventional high-temperature pigment. XRD and SEM further confirm that silicon coats with carbon black fully. The silica/ carbon black pigment may represent an opportunity for the applications in the decoration of the high-temperature ceramic.

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