Geopolymer Obtention Using Calcined Rice Husk Ash

2016 ◽  
Vol 881 ◽  
pp. 373-378
Author(s):  
Carlos Eduardo Pereira ◽  
André Miranda da Silva ◽  
Josiele Souza Batista Santos ◽  
Bianca Viana de Sousa
Keyword(s):  
Rice Husk ◽  
Bending Strength ◽  
Raw Material ◽  
Molar Ratio ◽  
Rice Hull ◽  
X Ray Diffraction ◽  
Rice Hull Ash ◽  
Hydrated Calcium Silicate ◽  
Irregular Shapes ◽  
Xrd Patterns

This study aimed to synthesize geopolymer materials using the ash of burned rice husk. The material was prepared from bauxite slurry, rice hull ash was calcined at 600 °C, metakaolin and sodium hydroxide 12 M solution. The material was cured at 60 °C for 6 h and then at ambient temperature for up to 28 days. We used the same mixture of experimental design to synthesize geopolymer. Through techniques spectroscopy energy dispersive X rivers and X-ray diffraction, it appears that the silica and alumina contents of the identified raw material meets the conditions laid down as minimum for precursors with geopolymer activation potential, as evidenced by the molar ratio Si/Al sample. Geopolymer obtained from the XRD patterns showed characteristic peaks of hydrated calcium silicate. It was found that the particles had irregular shapes and sizes, and the presence of voids affecting the strength of the material. The geopolymeric material obtained showed improvements in the bending strength in a curing time of 28 days.

scholarly journals Isolation and characterization of cellulose from rice husk waste and sawdust with chemical method

2020 ◽  
Vol 20 (1) ◽  
pp. 6-9
Author(s):  
RIZKI ANDALIA ◽  
RAHMI RAHMI ◽  
JULINAWATI JULINAWATI ◽  
HIRA HELWATI
Keyword(s):  
Rice Husk ◽  
Chemical Method ◽  
Raw Material ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Bleaching Process ◽  
Cellulose Structure ◽  
Isolation And Characterization ◽  
Sem Micrograph ◽  
Xrd Patterns

Cellulose had been isolated from rice husk waste and sawdust with chemical method through hydrolysis with HCl 2.5 N and bleaching process with  H2O23%.The yields were 13,45% and 22,75% (w/w) of cellulose from rice husk waste and sawdust, respectively. The chemical treatment caused partial removal of lignin and hemicellulose from raw material showed by FTIR spectrum.  Structure and morphology of cellulose from rice husk waste and sawdust were investigated using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The XRD patterns showed cellulose structure converted from amorphous to crystalline form after bleaching process while SEM images showed that the isolated cellulose from rice husk waste had rougher surface than cellulose from sawdust. The SEM micrograph also showed that the isolated cellulose from rice husk was in the form of aggregates.

Performance of B-Doped SrTiO3/ Ni Sheet for Supercapacitor Material Application

2020 ◽  
Vol 851 ◽  
pp. 25-31
Author(s):  
Markus Diantoro ◽  
Ahmad Al Ittikhad ◽  
Thathit Suprayogi ◽  
Nasikhudin ◽  
Joko Utomo
Keyword(s):  
Electrode Materials ◽  
Solid State Reaction Method ◽  
Raw Material ◽  
Molar Ratio ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Energy Storage Devices ◽  
Xrd Pattern ◽  
X Ray ◽  
Storage Devices

The development of energy storage devices encourages the sustainability of research on basic materials of supercapacitor technology. SrTiO3 is one of metal oxide called as titanate alkali metal ATiO3 (A = Ba, Sr, Ca). This material shows an excellent dielectric constant, thus expected to be potential as raw material of supercapacitor. In this work, boron was used as a dopant on the SrTiO3 system to modify its local structure and enhance the electrical properties. Synthesis SrTi1-xBxO3 was carried out using a solid-state reaction method followed by the sintering process in various molar ratio. The microstructure of SrTi1-xBxO3 compound was identified by X-ray Diffraction with Cu-Kα. XRD pattern identified the presence of SrTi1-xBxO3 phase with a slight change in the lattice parameters. I-V measurement confirmed that the electrical conductivity increased gradually up to 16.04 Ω-1cm-1. For investigating their application for electrode materials, CV was employed and it presents that the specific capacitance and energy density of x = 0.08 were 5.488 Fg-1 and 0.110 Jg-1.

scholarly journals Characterization of Algerian kaolins for utilization as a raw material in electrical insulators

Cerâmica ◽  
2019 ◽  
Vol 65 (374) ◽  
pp. 267-273
Author(s):  
M. Laraba
Keyword(s):  
Bending Strength ◽  
Dielectric Strength ◽  
Raw Material ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
X Ray Diffraction ◽  
Electrical Insulator ◽  
X Ray ◽  
Three Samples ◽  
Porcelain Insulators

Abstract The aim of this investigation was to characterize three samples of kaolin (DD1, DD2 and DD3) collected from Djebel Debbagh deposit (East of Algeria) to be used in electrical porcelain insulators. Grain-size analysis, X-ray fluorescence, X-ray diffraction, scanning electron microscopy and thermal analysis (TG-DTA) were performed. Each sample was mixed with feldspar and silica to obtain three porcelain formulations. The obtained results indicated that the three kaolins were composed by kaolinite and halloysite with variable contents of MnO and Fe2O3 as associated impurities. It was found that the DD1 was the appropriate kaolin as raw material for making the high-voltage electrical insulator which had the highest electrical and mechanical properties (dielectric strength, bending strength and bulk density), while DD2 and DD3 were less suitable due to their lower properties caused by the presence of impurities which must be removed.

Research on Correlation between Formula of Steel Slag Ceramic (CaO-MgO-Al2O3-SiO2 System) and Macro Property

2011 ◽  
Vol 374-377 ◽  
pp. 1220-1225
Author(s):  
Li Hua Zhao ◽  
Wei Wei ◽  
Chao Lian ◽  
Xian Cong Zhao ◽  
Hao Bai ◽  
...  
Keyword(s):  
Bending Strength ◽  
Converter Slag ◽  
Steel Slag ◽  
Raw Material ◽  
National Standard ◽  
New Approach ◽  
Ceramic Synthesis ◽  
All Ceramic ◽  
System Phase Diagram ◽  
Xrd Patterns

This paper demonstrated a new approach to the utilization of steel slag and provided a pattern for steel slag ceramic synthesis. Based on previous research on steel slag (converter slag) applied as raw material of ceramic and directed at content of steel slag CaO-MgO-Al2O3(5wt%)-SiO2 system phase diagram was utilized in steel slag ceramic formula designing and augite region was selected. Bending strength of sample could reach 62.26MPa which was higher than national standard. When the content of steel slag was 40wt%, the steel slag ceramic would perform rather high bending strength. Through XRD patterns demonstrated the dominated crystal phases of all ceramic samples were pyroxene group crystals, akermanite existed in some samples also. But bending strengths of ceramics containing akermanite were lower than of samples containing pyroxene purely. Hence, diopside could be considered as the factor of improving ceramic bending strength.

scholarly journals Synthesis of Rosin Acid Starch Catalyzed by Lipase

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Rihui Lin ◽  
He Li ◽  
Han Long ◽  
Jiating Su ◽  
Wenqin Huang
Keyword(s):  
Rosin Acid ◽  
Cassava Starch ◽  
Raw Material ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mild Conditions ◽  
Pine Trees ◽  
Thermal Stability Of

Rosin, an abundant raw material from pine trees, was used as a starting material directly for the synthesis of rosin acid starch. The esterification reaction was catalyzed by lipase (Novozym 435) under mild conditions. Based on single factor experimentation, the optimal esterification conditions were obtained as follows: rosin acid/anhydrous glucose unit in the molar ratio 2 : 1, reaction time 4 h at 45°C, and 15% of lipase dosage. The degree of substitution (DS) reaches 0.098. Product from esterification of cassava starch with rosin acid was confirmed by FTIR spectroscopy and iodine coloration analysis. Scanning electron microscopy and X-ray diffraction analysis showed that the morphology and crystallinity of the cassava starch were largely destroyed. Thermogravimetric analysis indicated that thermal stability of rosin acid starch decreased compared with native starch.

Synthesis and Characterization of Phosphoric Silica Catalyst from Bamboo Leaves for Production of Triacetin

2022 ◽  
Vol 54 ◽  
pp. 129-137
Author(s):  
Renita Manurung ◽  
Muhammad Dedi Anggreawan ◽  
Alwi Gery Agustan Siregar
Keyword(s):  
High Performance ◽  
Catalytic Amount ◽  
Raw Material ◽  
Molar Ratio ◽  
Solid Catalyst ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bamboo Leaves ◽  
Bamboo Leaf Ash

In this research, the bamboo leaf shows promise as an alternative raw material for silica production. This study investigated the performance of heterogeneous catalyst prepared from silica derived bamboo leaf ash after that impregnated with phosphoric acid at ratio various. The catalyst was characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope Energy Dispersive X-Ray Spectroscopy (SEM-EDS), Brunauer Emmet Teller (BET) and Barrett, Joyner and Halenda (BJH) method and triacetin product analyzed by GC-MS. The optimum condition phosphoric silica catalyst was obtained at phosphoric silica molar ratio of 1:2 and employed in the acetylation of glycerol, respectively. As result, 24 % selectivity for triacetin was obtained in the presence of catalytic amount 5%, molar ratio 1:9 at 100 °C for 4 hours. Bamboo leaf derived phosphoric silica calcined showed high potential to be used as an easy to prepare and high-performance solid catalyst for industrial scale.

Influence of S⁄La Molar Ratio on the Morphology and Optical Property of La2S3 Microcrystalline Prepared by Microwave Hydrothermal

2012 ◽  
Vol 512-515 ◽  
pp. 223-226
Author(s):  
Ye Zhang ◽  
Li Yun Cao ◽  
Jian Feng Huang ◽  
Jian Peng Wu
Keyword(s):  
Ultraviolet Light ◽  
Room Temperature ◽  
Molar Ratio ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Microwave Hydrothermal ◽  
Irregular Shapes ◽  
Light Excitation

The La2S3 microcrystalline were prepared by microwave hydrothermal method (M–H). The influences of different S⁄La molar ratio on the phase composition, and morphology of the La2S3 microcrystalline were particularly investigated. The obtained samples were characterized by X–ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet and visible–spectroscopy (UV–vis) and photoluminescence spectroscopy (PL) at room temperature. XRD results show that the decrease of S⁄La molar ratio from 6⁄3 to 6⁄6, the improving in crystallization of the obtained microcrystalline is observed with the decrease in S⁄La molar ratio. The morphology of prepared La2S3 transforms from irregular shapes to quasi-sphere structure. The as-prepared microcrystalline show excellent absorbency of ultraviolet light and are almost transparent to visible light to exhibit stable violet-blue photoluminescence properties under the ultraviolet light excitation at room temperature.

scholarly journals Synthesis of geopolymer spheres with photocatalytic activity

2019 ◽  
Vol 268 ◽  
pp. 04007
Author(s):  
Patricia Isabel Bravo ◽  
Roy Alvin Malenab ◽  
Eiza Shimizu ◽  
Derrick Ethelbhert Yu ◽  
Michael Angelo Promentilla
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Property ◽  
Porous Matrix ◽  
Raw Material ◽  
Rice Hull ◽  
Rice Hull Ash ◽  
Environmental Application ◽  
Methylene Blue Degradation ◽  
Alkaline Activator ◽  
Alkali Activated

Geopolymer is an emerging “green” cementitious material which has a potential to valorize waste such as rice hull ash (RHA). Geopolymer is a kind of alkali-activated material which forms from the reaction of alumino-silicates in an alkaline solution. This study uses RHA as the raw material for alkaline activator while metakaolin (MK) serves as a geopolymer precursor to synthesize the so-called geopolymer sphere. Then its capacity as a porous matrix was explored upon incorporation of TiO2 nanomaterial using horizontal vapor phase growth (HVPG) technique to enhance its photocatalytic property. Indication suggests that the synthesized MK-geopolymer spheres activated with RHA-based water glass solution (WGS) were comparable to that of commercial WGS. Furthermore, the geopolymer spheres were successfully coated with TiO2 in the form of nanocrystals. Its photocatalytic activity was evaluated in terms of methylene blue degradation. This material’s potential environmental application for water purification and wastewater treatment will be investigated for future works.

Influence of Composition and Isothermal Sintering on the Properties of Hydroxyapatite Bioceramic Bodies

2014 ◽  
Vol 979 ◽  
pp. 347-350
Author(s):  
Rungsarit Koonawoot ◽  
Cherdsak Saelee ◽  
Sakdiphon Thiensem ◽  
Sittiporn Punyanitya
Keyword(s):  
High Efficiency ◽  
Bending Strength ◽  
Strength Properties ◽  
Raw Material ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

This work reports the influence of chemical composition and sintering schedule on the properties of sintered bodies of hydroxyapatite (HA) bioceramic. The method of preparing sintered bodies by solid state reaction and uniaxial pressing. The raw material used calcium carbonate (CaCO3) and ammonium dihydrogen phosphate (NH4H2PO4) powder as precursors. These powders were mixed at CaCO3: NH4H2PO4 mass ratio of 1:0.697, 1:0.692, 1:0.689, 1:0.685 and 1:0.68, respectively. The compositions in the temperatures range of 800-1300 °C for 3 hour. The sintered bodies were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR). Properties including phase, microstructures, porosity and bending strength of the samples. The results show that green bodies can be sintered at 1150 °C for 3 hours. This temperature found that crystals growth, highest of HA phase content in sintered bodies, good density and high efficiency strength properties.

Evolution of Microstructures and Properties of the AlxCrCuFeNi2 High-Entropy Alloys

2013 ◽  
Vol 745-746 ◽  
pp. 706-714 ◽  
Author(s):  
Sheng Guo Ma ◽  
Zhao Di Chen ◽  
Yong Zhang
Keyword(s):  
Phase Transformation ◽  
Cast Alloy ◽  
Alloy System ◽  
Molar Ratio ◽  
High Entropy Alloys ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Entropy ◽  
Heat Treated ◽  
Xrd Patterns

The microstructure and Vickers hardness of the AlxCrCuFeNi2(x=0.5, 1.0, and 2.0 in molar ratio) high-entropy alloys with as-cast and heat-treated states were investigated. X-ray diffraction (XRD) patterns suggested that for the Al0.5 alloy annealed at 900,an incomplete phase transformation from FCC to BCC occurred, while for the Al2.0 alloy as heated at 500 and 700, a converse phase transformation from BCC to FCC was obtained. Compared with the as-cast dendrites, after heat treatment, the microstructure of the alloys was obviously coarsened or spheroidized or homogenized, whereas the resultant hardness has almost not decreased even at high heating temperatures, which indicated the probability of ordering for this alloy system and thus effectively compensating the stress and structural relaxations. The Al2.0 alloy reached the maximum hardness value of 610 HV by annealing at 1100, which might be ascribed to the worm-like nanoprecipitations and the enhanced fraction of B2-ordered precipitations. By cold rolling, the Al0.5 alloy is able to reach the yield strength of 1055 MPa and the fracture strength of 1179 MPa, which was a significant improvement in comparison with the as-cast alloy.

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