scholarly journals UTILIZATION OF RICE HUSK AS RAW MATERIAL IN SYNTHESIS OF MESOPOROUS SILICATES MCM-41

2011 ◽  
Vol 11 (3) ◽  
pp. 279-284 ◽  
Author(s):  
Suyanta Suyanta ◽  
Agus Kuncaka
Keyword(s):  
Ftir Spectroscopy ◽  
Sodium Silicate ◽  
Rice Husk ◽  
Hydrothermal Process ◽  
X Ray Diffraction ◽  
Rice Husk Silica ◽  
X Ray ◽  
Silica Source ◽  
Significant Difference ◽  
Mcm 41

The research about synthesis and characterization of MCM-41 from rice husk has been done. Silica (SiO2) was extracted from rice husk by refluxing with 3M hydrochloric solution at 80 °C for 3 h. The acid-leached rice husk was filtered, washed, dried and calcined at 650 °C for 6 h lead the rough powder of rice husk silica with light brown in color. Characterization was carried out by X-ray diffraction (XRD) and FTIR spectroscopy method. Rice husk silica was dissolved into the sodium hydroxide solution leading to the solution of sodium silicate, and used as silica source for the synthesis of MCM-41. MCM-41 was synthesized by hydrothermal process to the mixture prepared from 29 g of distilled water, 8.67 g of cetyltrimethyl ammonium bromide (CTMAB), 9.31 g of sodium silicate solution, and amount mL of 1 M H2SO4. Hydrothermal process was carried out at 100 °C in a teflon-lined stainless steel autoclave heated in the oven for 36 h. The solid phase was filtered, then washed with deionised water, and dried in the oven at 100 °C for 2 h. The surfactant CTMAB was removed by calcination at 550 °C for 10 h with heating rate 2 °C/min. The as-synthesized and calcined crystals were characterized by using FTIR spectroscopy, X-ray diffraction and N2 physisorption methods. In order to investigate the effect of silica source, the same procedure was carried out by using pure sodium silicate as silica source. It was concluded that silica extracted from rice husk can be used as raw materials in the synthesis of MCM-41, there is no significant difference in crystallinity and pore properties when was compared to material produced from commercial sodium silicate.

Free Na and Less Fe Compositions of SiO2 Extracted from Rice Husk Ash as the Silica Source for Synthesis of White Mineral Trioxide Aggregate

2020 ◽  
Vol 840 ◽  
pp. 311-317
Author(s):  
Muhamad Ghadafi ◽  
Sri Juari Santosa ◽  
Yuichi Kamiya ◽  
Nuryono Nuryono
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Mineral Trioxide Aggregate ◽  
Deionized Water ◽  
X Ray Diffraction ◽  
X Ray ◽  
Silica Source ◽  
Tricalcium Aluminate ◽  
White Mineral

In this research, we report the use of free sodium and less Fe ion silica (SiO2) for preparation of White Mineral Trioxide Aggregate (WMTA). SiO2 was extracted from rice husk ash (RHA) using NaOH 2 M and HCl 37% (v/v) and removal of Na was performed by washing the extracted SiO2 using deionized water with various volumes and techniques. Before extraction, RHA was calcined at a temperature of 700 °C for 3 h. Preparation of WMTA began with mixing the extracted SiO2 20%, CaO 60%, Al2O3 2%, and Bi2O3 18% (w/w). The mixture was calcined at temperatures of 1100 °C for 4 h, grounded to produce WMTA 200 mesh in size and then was characterized using Fourier Transformed Infrared (FTIR) spectrophotometer, X-ray Diffraction (XRD) and Scanning Electron Microscopy-Energy Dispersion X-ray (SEM-EDX). The WMTA characteristics were compared to that of the commercial WMTA ProRoot. The result shows that the silica that was potential as the silica source for WMTA preparation was extracted from RHA involving sonication and washing with 360 mL of deionized water per 10 g of RHA. It contained SiO2 of 94.2%, Fe2O3 of 0.03%, no Na2O, and the particle size of 1.51±0.46 µm. The characterization of WMTA shows that produced WMTA contained tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C3A) and BiO2, which is comparable to the commercial WMTA ProRoot.

New Routes Study for Synthesis of Molecular Sieves Type Al-MCM-41 and Al-SBA-15

2012 ◽  
Vol 727-728 ◽  
pp. 1222-1227
Author(s):  
Rafaela Pereira Roque de Miranda ◽  
José Otávio Peroba Nascimento Santos ◽  
José Jailson Nicácio Alves ◽  
Romildo Pereira Brito ◽  
Bianca Viana de Sousa
Keyword(s):  
Molecular Sieves ◽  
X Ray Diffraction ◽  
X Ray ◽  
Catalytic Application ◽  
Silica Source ◽  
New Synthesis ◽  
Different Temperatures ◽  
Synthesis Routes ◽  
Mcm 41 ◽  
Great Development

The areas of research, synthesis and catalytic application of zeolites as molecular sieves are a field of great development and prominence in recent decades. Needs of the industries of petrochemical and fine chemicals have been encouraging specific studies for the application of molecular sieves looking for technological, commercial, and more recently sustainable developments. In this work molecular sieves type Al-MCM-41 and Al-SBA-15 has been synthesized using new synthesis routes by replacing the silica source conventionally used by rice husk. The molecular sieves obtained were confirmed by X-ray diffraction. Through the thermograms the decomposition of the driver at different temperatures was noticed. According to SEM micrographs can be observed that the material shows an aggregate of relatively uniform short particles.

Microwave-Assisted Preparation of Sodium Silicate as Biodiesel Catalyst from Rice Husk Ash

2017 ◽  
Vol 751 ◽  
pp. 461-466 ◽  
Author(s):  
Jaturon Kumchompoo ◽  
Wasinee Wongwai ◽  
Ratchadaporn Puntharod
Keyword(s):  
Sodium Silicate ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Biodiesel Production ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted ◽  
Flame Atomic Absorption ◽  
Flame Atomic Absorption Spectrophotometer ◽  
Infrared Spectrophotometer

In this research, sodium silicate (Na2SiO3) was prepared by rice husk ash reacted with 10 M sodium hydroxide. The mixtures were heated by microwave at 400, 600, and 800 watt for 5 and 10 minutes. The formation of sodium silicate was characterized by Fourier transform infrared spectrophotometer. The vibrations of (Na)O–Si–O(Na) and O–Si–O were observed at 595 and 1023-986 cm-1, respectively, except at 800 watt disappeared those vibrations. The results of flame atomic absorption spectrophotometer provided the mole ratio of sodium and silicon was 2:1 as heating the product at 600 watt for 5 and 10 minutes. The phase of sodium silicate was characterized by X-ray diffraction. Sodium silicate could be used as catalyst as in biodiesel production from palm oil. The percentage of yield was 81 by volume.

scholarly journals A STUDY ON SYNTHESIS OF MCM-41 MESOPOROUS MATERIAL WITH SOURCE OF SODIUM SILICATE SOLUTION FROM RICE HUSK ASH

2017 ◽  
Vol 126 (1C) ◽  
pp. 37
Author(s):  
Hoàng Văn Đức
Keyword(s):  
Sodium Silicate ◽  
Rice Husk ◽  
Mesoporous Material ◽  
Rice Husk Ash ◽  
Hydrothermal Process ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Molar Ratio ◽  
Ctab Concentration ◽  
Mcm 41

<p>In the present paper, a synthesis of MCM-41 mesoporous material with the sodium silicate solution prepared from the rice husk ash as a silica source by the hydrothermal process was demonstrated. The influence of synthesized conditions such as CTAB concentration, SiO<sub>2</sub>/CTAB molar ratio, stirring time and hydrothermal time were investigated. The samples were characterized by XRD, FT–IR and N<sub>2</sub> adsorption–desorption measurement. The obtained results showed that the samples possessed highly ordered hexagonal mesostructure with uniform mesopore size distribution in a large range of CTAB concentration (1,98-4,81% mass) and the SiO<sub>2</sub>/CTAB molar ratio (4-15). The sample had a high surface area (1071 m<sup>2</sup>/g) and large pore diameter (33,5 Å) with the molar ratio of CTAB: SiO<sub>2</sub>: H<sub>2</sub>O = 1: 6: 1000.</p><p>Keywords: MCM-41, sodium silicate solution, rice husk ash</p>

scholarly journals Adsorption of reactive blue BF-5G dye on MCM-41 synthesized from Chocolate clay

Cerâmica ◽  
2020 ◽  
Vol 66 (379) ◽  
pp. 269-276
Author(s):  
L. N. R. de Paula ◽  
G. M. de Paula ◽  
M. G. F. Rodrigues
Keyword(s):  
Adsorption Equilibrium ◽  
Acid Leaching ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Order Model ◽  
Freundlich Model ◽  
X Ray ◽  
Silica Source ◽  
Pseudo Second Order ◽  
Mcm 41

Abstract The efficiency of as-synthesized and calcined mesoporous silica, using clay as a silica source, to remove the reactive blue BF-5G dye was investigated. The materials were characterized by X-ray diffraction (XRD) analysis, energy-dispersive X-ray fluorescence (ED-XRF), and Fourier-transform infrared spectroscopy. The kinetic and adsorption isotherms were also studied. The XRD and ED-XRF results showed that the Chocolate clay is rich in SiO2 (69.4%) and has a large amount of other oxides, which can be eliminated by acid leaching. According to the characterization results, the MCM-41 synthesis was effective and produced a highly-ordered material. The kinetic study showed the adsorption corresponded predominantly to the pseudo-second order model. Adsorption equilibrium was reached after 3 h, and the data were better fitted to the Freundlich model. Furthermore, both samples obtained satisfactory removal results, being potential adsorbents having reduced cost due to the use of an alternative silica source.

scholarly journals Synthesis and characterization of asphalt composite precursors using amorphous rice husk silica

Cerâmica ◽  
2019 ◽  
Vol 65 (374) ◽  
pp. 194-199 ◽  
Author(s):  
S. Sembiring ◽  
R. Situmeang ◽  
Z. Sembiring
Keyword(s):  
Rice Husk ◽  
Xrd Analysis ◽  
Decomposition Temperature ◽  
X Ray Diffraction ◽  
Rice Husk Silica ◽  
X Ray ◽  
Roof Material ◽  
Silica Addition ◽  
Potential Use

Abstract In this research, asphalt composites were produced by mixing asphalt with silica extracted from rice husk, with a ratio of asphalt to silica of 1:0, 1:1.7 and 1:2, and calcined at 150 °C. Development of structures was characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), followed by differential thermal analysis (DTA/TGA). The FTIR results showed the presence of Si-OH, C=O, and C-H functional groups, which were associated with asphaltene, carbon, and silica, according to the XRD analysis. The results obtained also indicated the significant effect of rice husk silica addition on phase transformation of asphaltene into silica and carbon, while asphaltene molecules were practically undetected. The presence of silica and carbon resulted in increased decomposition temperature of the sample. Based on these characteristics, the samples were considered as a roof material, suggesting their potential use as a substitute for lightweight steel roof devices.

Chemical and Mineralogical Properties of Rice Husk Ash (RHA)

2014 ◽  
Vol 70 (5) ◽  
Author(s):  
Jamo Usman Hassan ◽  
Mohamad Kamal Zaky Noh ◽  
Zainal Arifin Ahmad
Keyword(s):  
Electron Microscopy ◽  
Rice Husk ◽  
Cellular Structure ◽  
Rice Husk Ash ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Silica Source ◽  
Microscopic Techniques ◽  
Scanning Electron

Rice husk ash (RHA) as a silica source was studied, resulting from burning at a temperature of       700oC in an electric furnace. RHA consists of inorganic, incombustible matter in the rice husk that has been fused into an amorphous structure. Microscopic techniques, such as X-ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to observe the surface and internal structure of the RHA. The results among other things revealed that RHA consist of mainly SiO2, with amorphous structure, Microscopic examination showed that has a porous cellular structure and consists of irregular-shaped particles.   

Optimization of Processing Conditions on the Yield of Nano SiC Powder from Rice Husk

2011 ◽  
Vol 341-342 ◽  
pp. 103-107 ◽  
Author(s):  
N. Kavitha ◽  
M. Balasubramanian ◽  
Y.Deval Vashistha
Keyword(s):  
Silicon Carbide ◽  
Rice Husk ◽  
Process Parameters ◽  
Pyrolysis Temperature ◽  
Silica Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Silica Source ◽  
Factor Effect ◽  
Husk Rice

Nanoparticles of silicon carbide were produced through direct pyrolysis of stoichiometerically balanced rice husk. Rice husk used in this study was treated with different type and amount of silica source in order to enhance the silica/carbon ratio and thereby increase the yield. The synthesis was carried out in argon atmosphere. To increase the yield, different process parameters were identified and experiments were conducted at various levels using Taguchi design. The process parameters optimized using this design include silica source, pyrolysis temperature, silica content and heating rate. Silicon carbide produced from rice husk was analyzed using X - ray diffraction to identify the phase. From taguchi factor effect diagram it has been found that pyrolysis temperature and silica source plays major role in improving the yield.

scholarly journals Use of rice husk ash as only source of silica in the formation of mesoporous materials

Cerâmica ◽  
2013 ◽  
Vol 59 (349) ◽  
pp. 181-185 ◽  
Author(s):  
A. J. Schwanke ◽  
D. M. A. Melo ◽  
A. O. Silva ◽  
S. B. C. Pergher
Keyword(s):  
Mesoporous Materials ◽  
Rice Husk ◽  
Molecular Sieves ◽  
Rice Husk Ash ◽  
X Ray Diffraction ◽  
Scanning Electronic Microscopy ◽  
X Ray ◽  
Type Iv ◽  
Heating Treatment ◽  
Mcm 41

This paper reports the synthesis of molecular sieves similar to MCM-41 using rice husk ash as only source of silica. For comparison purposes, a standard synthesis was performed using aerosil 200 commercial silica. The rice husk silica was obtained by heating treatment at 600 ºC and leaching for 2 h in reflux with HCl 1mol.L-1 and used in the synthesis. The samples prepared were characterized by N2 adsorption, X-ray diffraction (XRD), scanning electronic microscopy (SEM) and thermogravimetric analysis (TG). By type-IV adsorption isotherms, the formation of mesoporous materials was observed. XRD showed the formation of hexagonal unidirectional pore materials similar to MCM-41. By SEM, it could be observed that the rice husk has fibrous aspect and that synthesis using calcined and leached rice husk did not react entirely because silica was only partially dissolved.

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