scholarly journals Pengaruh Waktu Reaksi Terhadap Viskositas Dan Densitas Tetraetil Ortosilikat Dari Silika Abu Sekam Padi

2020 ◽  
Vol 8 (1) ◽  
pp. 72-78
Author(s):  
Dwi Rasy Mujiyanti ◽  
Hayatun Nisa ◽  
Kholifatu Rosyidah ◽  
Dahlena Ariyani ◽  
Abdullah Abdullah
Keyword(s):  
Reaction Time ◽  
Functional Groups ◽  
Rice Husk ◽  
Manufacturing Process ◽  
Rice Husk Ash ◽  
Silica Powder ◽  
Rice Husk Silica ◽  
Ftir Characterization ◽  
Al2o3 Catalyst

Tetraethyl Ortosylicate (TEOS) is a material is widely used in industrial fields. One source of silica (SiO2) is rice husk ash. In this study was determined the effect of reaction time on viscosity and density in making TEOS from silica rice husk. Silica resulting from the purification of rice husk ash is used in the TEOS manufacturing process by examining the variation of reaction time. One mole of ethanol and 0.25 mole of silica powder were added into 250 ml of round bottom flask followed by the addition of 1 gram of CuO/Al2O3 catalyst then the mixture was refluxed for 30, 35, 40, 45 and 50 hours with sufficient stirring and a temperature of 90 °C. The FTIR characterization results show that there are three main functional groups, namely the -OH, Si-O and C-O groups in the five TEOS synthesis results. Wavenumbers of the –OH functional groups obtained ranged from 3349 cm-1 - 3315 cm-1; Si-O functional groups range from 813 cm-1 - 606 cm-1 and C-O functional groups range from 1105 cm-1 - 1040 cm-1. Reaction time has no significant effect on viscosity. Reaction time has no significant effect on the density and density of the resulting TEOS.

scholarly journals Desulfurization and Denitrification Performance of Modified Rice Husk Ash-Carbide Slag Absorbent

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 68
Author(s):  
Yali Wang ◽  
Xiaoning Han ◽  
Meina Chen ◽  
Suping Cui ◽  
Xiaoyu Ma ◽  
...  
Keyword(s):  
Functional Groups ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Research Direction ◽  
Cement Industry ◽  
Hydration Process ◽  
Air Pollution Control ◽  
Large Area ◽  
Carbide Slag ◽  
High Investment

In the cement industry, SO2 and NOx are generally removed separately. There are many problems, such as large area, high investment cost, secondary pollution and so on. Desulfurization and denitrification technology have become a frontier research direction in the field of air pollution control. In this paper, rice husk ash and carbide slag were compounded and modified to prepare modified rice husk ash-carbide slag composite absorbent, and its desulfurization and denitrification performance and mechanism were studied. The results showed that the NO conversion and SO2 conversion of the modified rice husk ash-carbide slag composite absorbent increased by 44% and 2%, respectively, at 700 °C. Fibrous calcium silicate and calcium silicoaluminate hydrates were formed during the hydration process, which made the specific surface area of the absorbent larger and provided more reactive sites. The hydration process increases the content of oxygen-containing functional groups, decreases the hydroxyl/ether C–O functional groups, and increases the content of carboxyl–COO functional groups are conducive to the denitrification reaction.

scholarly journals SYNTHESIS AND CHARATERISATION OF RICE HUSK SILICA BASED BOROSILICATE (B2SiO5) CERAMIC BY SOL-GEL ROUTES

2011 ◽  
Vol 11 (1) ◽  
pp. 85-89 ◽  
Author(s):  
Simon Sembiring
Keyword(s):  
Functional Groups ◽  
Rice Husk ◽  
Boron Oxide ◽  
Chemical Resistance ◽  
Sol Gel ◽  
Gravimetric Method ◽  
Spectroscopic Technique ◽  
X Ray Diffraction ◽  
Rice Husk Silica ◽  
Hydrolysis Of

In this research, borosilicate ceramics were produced from rice husk silica. Preparation of borosilicate ceramics was conducted by mixing boron oxide sol from borax with silica sol extracted from rice husk. The boron oxide was produced by hydrolysis of borax using H2SO4 5%. The samples were synthesized with different compositions, with the ratios of silica to boron oxide are 8:1, 8:2, 8:3 and 8:4. The samples were sintered at 900 °C. Functional groups were examined using FTIR spectroscopic technique. Structural and microstructural characteristics were examined by XRD and SEM, respectively. The chemical resistance of borosilicate is evaluated by gravimetric method using H2SO4, HCl, NaOH and KOH. The FTIR study revealed that the main functional groups are Si-O-Si, B-O-B, and B-O-Si. The x-ray diffraction (XRD) study revealed that the main crystalline phases are borosilicate (B2SiO5) and boron oxide (B2O3). SEM investigations clearly demonstrated that the smaller particle size was found with increasing in boron oxide concentration. From the chemical resistance test carried out, it was obtained that the produced borosilicate possessed high resistance to acids and alkalis.

scholarly journals Preliminary Study on Functional Groups Characteristics of Asphalt Containing Rice Husk Silica

2019 ◽  
Vol 1 (1) ◽  
pp. 61-66
Author(s):  
Simon Sembiring
Keyword(s):  
Functional Groups ◽  
Rice Husk ◽  
Functional Group ◽  
Rice Husk Silica ◽  
Preliminary Study ◽  
Xrd Studies ◽  
Group Characteristics

In this research, asphalt composite was produced by combining asphalt and rice husk silica. The ratio of asphalt and silica were 1:1.5; 1:1.7; and 1:1.9 respectively and calcined at temperature of 150 oC. Functional group characteristics of asphalt composites were examined by FTIR and XRD. The FTIR and XRD studies revealed that the main Functional groups are Si-O-Si, C-H, and structure amorph of silica.

scholarly journals Sintesis dan karakterisasi magnetit terlapis dimerkaptosilika

2019 ◽  
Vol 4 (2) ◽  
pp. 81-88
Author(s):  
Abdurrazaq Habib ◽  
Ngatijo ◽  
Diah Riski Gusti
Keyword(s):  
Sodium Silicate ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Sol Gel ◽  
Silica Coating ◽  
Oh Groups ◽  
Gel Method ◽  
Ftir Characterization ◽  
Wave Numbers ◽  
Mercapto Groups

Synthesis of dimerkaptosilica coated magnetite was carried out in several stages, namely synthesis of magnetite from FeCl3.6H2O and FeSO4.7H2O by coprecipitation method. Extraction of sodium silicate from rice husk ash as a source of silica. Coating magnetite by dimerkaptosilica using 2,3-dimercapto-1-propanol as a source of mercapto groups and sodium silicate as sources of silica. Coating is done by the sol-gel method. FTIR characterization showed the appearance of uptake at wave numbers 894,04 cm-1, 2951,22 cm-1 and 3655,26 cm-1 from several absorbances which also appeared in magnetite material spectra indicating ―SH, ―CH2 and ―OH groups. XRD characterization was characterized by the appearance of a peak at 2θ, which was 35,43° and SEM characterization showed that the material Fe3O4―DMS had a morphological shape in the form of round clumps forming gray-colored aggregates.

scholarly journals Penentuan pH Optimum Gel Metasilikat Sekam Padi sebagai Media Tumbuh Kristal Tunggal Kalsium Tartrat Tetrahidrat (CaC4H4O6.4H2O)

2019 ◽  
Vol 20 (2) ◽  
pp. 195
Author(s):  
Yunanda FR ◽  
Suriati Eka Putri ◽  
Hasri Hasri ◽  
Ramdani Ramdani
Keyword(s):  
Single Crystal ◽  
Functional Groups ◽  
Sodium Silicate ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
White Crystal ◽  
Ph Optimum ◽  
Calcium Tartrate ◽  
Optimum Ph

ABSTRAK Penelitian ini bertujuan untuk mengetahui pH optimum sintesis gel metasilikat sekam padi sebagai media tumbuh kristal tunggal kalsium tartrat tetrahidrat (CaTT). Tahapan penelitian ini meliputi preparasi sampel, pembentukan gel metasilikat, sintesis kristal CaTT dan karakterisasi gel metasilikat. Abu sekam padi yang digunakan mengandung SiO2 sebesar 98,45% berpotensi untuk membentuk filtrat natrium silikat (Na2SiO3). Filtrat natrium silikat direaksikan dengan asam tartrat (C4H6O6) menghasilkan gel metasilikat pada pH 5,00; 5,25; 5,50; 5,75 dan 6,00. Supernatan kalsium klorida (CaCl¬2) berdifusi ke dalam gel membentuk kristal CaTT berwarna putih jernih sebanyak 0,2649 g pada pH optimum 5,25. Analisis gugus fungsi gel metasilikat menggunakan spektroskopi FTIR memberikan serapan yang khas untuk gugus fungsi –OH pada 3400,05 cm-1 dan 920,05 cm-1, gugus fungsi C=O pada 1622,13 cm-1 dan C-O pada 1346,31 cm-1, serta gugus Si-O-Si pada 1064,71 cm-1. Karakterisasi gel metasilikat menggunakan XRD mengindikasikan bahwa struktur gel metasilikat hasil sintesis tersusun atas garam Na2C4H4O6.2H2O, senyawa SiO2 dan C-grafit. Berdasarkan analisis gugus fungsi menggunakan FTIR dan karakterisasi menggunakan XRD, dapat disimpulkan bahwa sekam padi berpotensi untuk dijadikan gel metasilikat sebagai media tumbuh kristal tunggal CaTT. Kata kunci: Sekam padi, Natrium Silikat, Gel metasilikat, Kalsium tartrat tetrahidrat ABSTRACT The aims of this study was to determine the optimum pH of metasilicate gel rice husk as medium to grow single crystal of calcium tartrate tetrahydrate (CaC4H4O6.4H2O). This research was carried out inseveral stage namely sample preparation, metasilicate gel synthesis, crystal CaTT synthesis, and metasilicate gel characterization. Rice husk ash that used content SiO2 of 98.45 %, it was potential to be a sodium silicate filtrate. Filtrate of sodium silicate was reacted with tartrat acid (C4H6O6) and produce metasilicate gel with pH 5,00; 5,25; 5,50; 5,75 and 6,00. The supernatant of calcium chloride (CaCl¬2) diffuse into the gel and formed the clear white crystal CaTT as much as 0,2649 g at the optimum pH 5,25. Analysis of functional groups of metasilicate gel by FTIR provides the specific absorption of –OH group at 3400.05 cm-1 and 920.05 cm-1, C=O group at 1622.13 cm-1 and C-O group at 1346.31 cm-1, and the Si-O-Si group at 1064.71 cm-1. Characterization of gel metasilicate by XRD indicated that metasilicate gel produced formed on Na2C4H4O6.2H2O, compound of SiO2 and C-Grafit. Based on the analysis of functional groups by FTIR and characterization by XRD, it was concluded that the rice husk was potentially to be a sources of metasilicate gel as medium to grow single crystal of CaTT. Keywords: Rice Husk, Sodium Silicate, Gel metasilicate, Calcium tartrate tetrahydrate

scholarly journals Flow Behavior and Mixing Characteristics of Rice Husk/Silica Sand/Rice Husk Ash

2016 ◽  
Vol 54 (4) ◽  
pp. 533-542
Author(s):  
Bo Hwa Kim ◽  
Myung Won Seo ◽  
Jin Woo Kook ◽  
Hee Mang Choi ◽  
Ho Won Ra ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Flow Behavior ◽  
Silica Sand ◽  
Rice Husk Silica ◽  
Mixing Characteristics ◽  
Sand Rice

scholarly journals Investigation of negative effects of rice husk silica on komatsuna growth using three experiments

2019 ◽  
Vol 8 (S1) ◽  
pp. 311-319
Author(s):  
Ryoko Sekifuji ◽  
Le Van Chieu ◽  
Masafumi Tateda
Keyword(s):  
Plant Growth ◽  
Field Experiment ◽  
Brassica Rapa ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Pot Experiment ◽  
Negative Effects ◽  
Rice Husk Silica ◽  
Plant Cultivation ◽  
Optimal Quantity

Abstract Purpose This study aims to evaluate the potential negative effects of rice husk as a source of fertilizer on plant growth. Methods Growth tests were conducted on komatsuna (Brassica rapa var. perviridis) using three types of experiment. A pot experiment was conducted to compare different fertilizers on an individual basis. A second pot experiment was conducted to compare different mixtures of fertilizers. Finally, a field experiment was performed to determine the effects of the application of different quantities of silica. Results The results showed that komatsuna grew better with the application of silica mixed with fertilizer, and that there was an optimal quantity of silica to be used, when used on its own. It was found that, in all cases, the silica in the rice husk ash did not have any measurable negative effects on the growth of the komatsuna. Conclusions We, therefore, conclude that rice husk silica can undoubtedly be used for plant cultivation.

Stabilization of colluvial soil using rice husk ash and micro silica powder

2020 ◽  
Vol 32 ◽  
pp. 819-823
Author(s):  
Sachin Verma ◽  
Vidya Sagar Khanduri ◽  
Anupam Mittal
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Silica Powder ◽  
Colluvial Soil ◽  
Micro Silica
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