scholarly journals Citric Acid-Assisted Inexpensive Semi-Wet Combustion Synthesis and Characterization of Ultrafine LiFe0.95Ti0.05PO4 and LiFePO4 Polycrystalline Materials

2020 ◽  
Author(s):  
Youngil Lee ◽  
Laxman Singh ◽  
Dev Kumar Mahato ◽  
R.N. Rai ◽  
Ashok Kumar Gupta
Keyword(s):  
Citric Acid ◽  
Low Cost ◽  
Sol Gel ◽  
Metal Nitrate ◽  
Polycrystalline Materials ◽  
Quality Life ◽  
Auto Combustion ◽  
Calcination Method ◽  
Sol Gel Synthesis ◽  
Combustion Residue

Abstract A solution based economically low cost, eco-friendly and energetically advantageous alternative route for the fabrication of ultrafine LiFe0.95Ti0.05PO4 and LiFePO4, polycrystalline material by semi-wet combustion and sol-gel synthesis is presented. The thermal analysis, crystal structure, morphology and composition of the materials were investigated using different physio-chemical characterizations. TG/DTA, X-ray diffraction, TEM, SEM, EDX, and XPS. The route required auto-combustion of an aqueous metal nitrate solutions in air with the aid of citric acid and is efficient for the fabrication of high quality, LiFe0.95Ti0.05PO4 and LiFePO4 at low temperature, in the combustion residue itself. On a micro-structural studies the grain size was seen in submicron-size that was acquired in a long-established sol-gel combustion and succeeding calcination method. Consequently, the present method reported can yield the ultrafine LiFePO4 and LiFe0.95Ti0.05PO4 at moderate temperature and is look forward to be applicable for other iso-structural polycrystalline materials.

Synthesis of BiFeO3-PbTiO3 Powders by Sol-Gel Auto-Combustion Process

2007 ◽  
Vol 280-283 ◽  
pp. 609-612 ◽  
Author(s):  
Hao Sheng ◽  
Zhen Xing Yue ◽  
Zhi Lun Gui ◽  
Long Tu Li
Keyword(s):  
Citric Acid ◽  
Aqueous Solutions ◽  
Ir Spectra ◽  
Single Phase ◽  
Sol Gel ◽  
Combustion Process ◽  
Combustion Method ◽  
Metal Nitrate ◽  
Auto Combustion

BiFeO3-PbTiO3 powders were synthesized by a novel sol-gel auto-combustion method. The gels, transformed from the aqueous solutions of metal nitrate and citric acid, undergo a selfpropagatingcombustion process when being ignited and yield voluminous ashes. These ashes are single phase perovskite BiFeO3-PbTiO3 powders. The redox behaviors of the dried gels were studied by DTA-TG technique and IR spectra. The synthesized powders were characterized in terms of XRD, SEM and BET techniques.

Synthesis of Multiferroic BiFeO3 Powders by Sol-Gel Auto-Combustion

2011 ◽  
Vol 412 ◽  
pp. 99-102
Author(s):  
Xi Wei Qi ◽  
He Ji Xu ◽  
Xiao Yan Zhang ◽  
Jian Quan Qi
Keyword(s):  
Citric Acid ◽  
Ambient Temperature ◽  
Sol Gel ◽  
Combustion Method ◽  
Metal Nitrate ◽  
The Self ◽  
Carboxyl Group ◽  
Multiferroic Bifeo ◽  
Auto Combustion ◽  
Combustion Behaviors

Crystalline multiferroic BiFeO3 powders were directly synthesized by sol-gel auto-combustion method. The gels, derived from the solutions of 2-methoxyethane, metal nitrate and citric acid, exhibited the self-propagating combustion behaviors at ambient temperature when it is ignited in air. After auto-combustion, the dried gels transformed into crystalline BiFeO3 powders and no further calcination was needed. The nature of auto-combustion was ascribed to heat-induced redox between NH4NO3 and carboxyl group. The TG-DTA was carried out to study the auto-combustion of dried gels. The synthesized powders were characterized by XRD and SEM techniques.

scholarly journals The Role of Nitrate on the Sol-Gel Spread Self-Combustion Process and Its Effect on the NH3-SCR Activity of Magnetic Iron-Based Catalyst

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 314
Author(s):  
Xing Ning ◽  
Zhi-bo Xiong ◽  
Bin Yang ◽  
Wei Lu ◽  
Shui-mu Wu
Keyword(s):  
Nitric Acid ◽  
Citric Acid ◽  
Sol Gel ◽  
Nox Reduction ◽  
Combustion Process ◽  
Catalytic Performance ◽  
Metal Nitrate ◽  
Acid Sites ◽  
Complexing Agent ◽  
Nh3 Scr

Sol-gel spread self-combustion is the burning of the complexing agent in dried gel and the oxidant. Meanwhile, high temperature takes place during the combustion process, which is harmful to the pore structure of the catalyst. The nitrate from metal nitrate precursors as an oxidant could participate in the spread of the self-combustion process. Therefore, the influence of nitrate from metal nitrate on the spread self-combustion of an iron–cerium–tungsten citric acid gel and its catalytic performance of NOx reduction were investigated by removing nitrate via the dissolution of washing co-precipitation with citric acid and re-introducing nitric acid into the former solution. It was found that the removal of nitrate contributes to enhancing the NH3–SCR activity of the magnetic mixed oxide catalyst. The NOx reduction efficiency was close to 100% for Fe85Ce10W5–CP–CA at 250 °C while the highest was only 80% for the others. The results of thermal analysis demonstrate that the spread self-combustion process of citric acid dried gel is enhanced by re-introducing nitric acid into the citric acid dissolved solution when compared with the removal of nitrate. In addition, the removal of nitrate helps in the formation of γ-Fe2O3 crystallite in the catalyst, refining the particle size of the catalyst and increasing its pore volume. The removal of nitrate also contributes to the formation of Lewis acid sites and Brønsted acid sites on the surface of the catalyst compared with the re-introduction of nitric acid. The in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) demonstrates that both Eley–Rideal (E–R) and Langmuir–Hinshelwood (L–H) mechanisms exist over Fe85Ce10W5–CP–CA at 250 °C with E–R as its main mechanism.

A two-stage citric acid–sol/gel synthesis of ZnO/SiO2 nanocomposites: study of precursors and final products

2007 ◽  
Vol 10 (1) ◽  
pp. 107-120 ◽  
Author(s):  
Roberto Anedda ◽  
Carla Cannas ◽  
Anna Musinu ◽  
Gabriella Pinna ◽  
Giorgio Piccaluga ◽  
...  
Keyword(s):  
Citric Acid ◽  
Sol Gel ◽  
Two Stage ◽  
Sio2 Nanocomposites ◽  
Sol Gel Synthesis

Citric Acid Assisted Sol-Gel Synthesis and Photoluminescence Characteristics of CaAl1.8Y0.2-xO4: xTb Nanoparticles

2019 ◽  
Vol 33 (38) ◽  
pp. 27-31
Author(s):  
Vinod B. Taxak ◽  
Satyender P. Khatkar ◽  
Sang-Do Han ◽  
Mukesh Kumar
Keyword(s):  
Citric Acid ◽  
Sol Gel ◽  
Sol Gel Synthesis

scholarly journals Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel

2017 ◽  
Vol 12 (1) ◽  
Author(s):  
Bogdan K. Ostafiychuk ◽  
Larysa S. Kaykan ◽  
Julia S. Kaykan ◽  
Bogdan Ya. Deputat ◽  
Olena V. Shevchuk
Keyword(s):  
Citric Acid ◽  
Electrical Properties ◽  
Sol Gel ◽  
Combustion Method ◽  
Auto Combustion

The effects of surfactant in the sol–gel synthesis of CuO/TiO2 nanocomposites on its photocatalytic activities under UV-visible and visible light illuminations

2020 ◽  
Vol 44 (5) ◽  
pp. 1888-1904 ◽  
Author(s):  
T. N. Ravishankar ◽  
M. de O. Vaz ◽  
S. R. Teixeira
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Low Cost ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Photocatalytic Activities ◽  
Uv Visible ◽  
Sol Gel Synthesis ◽  
Surfactant Assisted

Effective and low-cost CuO/TiO2 nanocomposites were prepared at room temperature by a surfactant-assisted sol–gel method for photocatalytic activities under UV-visible and visible light irradiations.

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