Synthesis and Characterization of Nano-Wollastonite from Rice Husk Ash and Limestone

2013 ◽  
Vol 756 ◽  
pp. 43-47 ◽  
Author(s):  
Hamisah Ismail ◽  
Roslinda Shamsudin ◽  
Muhammad Azmi Abdul Hamid ◽  
Azman Jalar
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Sol Gel ◽  
Synthesis And Characterization ◽  
Mixed Solution ◽  
Minor Phase ◽  
Calcination Process ◽  
Major Phase ◽  
Nano Size

Wollastonite, CaSiO3 material was prepared from rice husk ash, as the source for SiO2 and limestone, source for CaO using sol-gel method. Rice husk ash and CaO powder was mixed together in 100ml distilled water with the rice husk ash/CaO ratios of 45:55 and 40:60. The mixed solution was place in the autoclave and heated at 135°C for 4 hours and calcined at 950°C for 1 and 2 hours. From the XRD results,ratio of 45:55 exhibited that b-wollastonite is the major phase and the minor phase is only contributed by cristoballite and by calcining the mixture for 2hrs would yield better crystallinity. Both of the rice husk ash:CaO ratios produced wollastonite materials in cylinder structures. Wollastonite with nano size grain was obtained for an hour calcination and 2 hrs of calcination would increase the grain size over 100 nm for ratio, 45:55 and 40:60.Therefore in order to get the nano size of wollastonite material, period of calcination process has to be controlled.

Synthesis and characterization of red mud and rice husk ash-based geopolymer composites

2013 ◽  
Vol 37 ◽  
pp. 108-118 ◽  
Author(s):  
Jian He ◽  
Yuxin Jie ◽  
Jianhong Zhang ◽  
Yuzhen Yu ◽  
Guoping Zhang
Keyword(s):  
Rice Husk ◽  
Red Mud ◽  
Rice Husk Ash ◽  
Synthesis And Characterization ◽  
Geopolymer Composites

scholarly journals Synthesis and Characterization of Microwave Sintered Silica Xerogel Produced from Rice Husk Ash

2016 ◽  
Vol 739 ◽  
pp. 012059 ◽  
Author(s):  
I N Sudiana ◽  
S Mitsudo ◽  
T Nishiwaki ◽  
P E Susilowati ◽  
L Lestari ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Silica Xerogel ◽  
Synthesis And Characterization

Synthesis and Characterization of Antibacterial Silver Nanoparticle-Impregnated Rice Husks and Rice Husk Ash

2013 ◽  
Vol 47 (10) ◽  
pp. 5276-5284 ◽  
Author(s):  
Di He ◽  
Atsushi Ikeda-Ohno ◽  
Daniel D. Boland ◽  
T. David Waite
Keyword(s):  
Rice Husk ◽  
Silver Nanoparticle ◽  
Rice Husk Ash ◽  
Synthesis And Characterization ◽  
Rice Husks

Synthesis and Characterization of Nanoparticulate Sols of TiO2 Doped with Erbium (III) for Photoinduced Applications

2012 ◽  
Vol 1442 ◽  
Author(s):  
M. Borlaf ◽  
R. Moreno ◽  
M. T. Colomer
Keyword(s):  
Band Gap ◽  
Isoelectric Point ◽  
Direct Evidence ◽  
Sol Gel ◽  
Common Method ◽  
Synthesis And Characterization ◽  
Major Phase ◽  
Point Increase

ABSTRACTColloidal sol-gel is a common method used for the preparation of stable and homogeneous nanoparticulate sols. In this work, TiO2 and Er3+ doped-TiO2 sols (1, 2 and 3 mole % Er3+) have been prepared. The peptization time, viscosity and isoelectric point increase at higher Er3+ concentration indicating that erbium (III) delays the peptization process, increases the viscosity and adsorbs onto the surface of the TiO2 nanoparticles. When the sols of TiO2 are doped with Er3+ lower values of the band gap are obtained. After drying, in all cases, anatase was obtained as major phase although traces of brookite are also detected. The microstructure was observed by TEM and shows direct evidence that the xerogels are polycrystalline.

scholarly journals Synthesis and Characterization of Titania-Rice Husk Silica Composites as Photocatalyst

2015 ◽  
Vol 15 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Posman Manurung ◽  
Rudy Situmeang ◽  
Ediman Ginting ◽  
Indra Pardede
Keyword(s):  
Rice Husk ◽  
Sol Gel ◽  
Bet Surface Area ◽  
Synthesis And Characterization ◽  
Ultraviolet Rays ◽  
X Ray Diffraction ◽  
Titanium Butoxide ◽  
X Ray ◽  
Scanning Electron

This article describes the synthesis of titania-silica composites by a sol-gel method using a mixture of silica of rice husk and titanium butoxide sols. Microstructures were examined at calcination temperature in the range of 500 to 700 °C, with temperatures interval of 50 °C. The sintered catalysts were subsequently tested for photodegradation of methylene blue (MB) under ultraviolet and sunlight rays. Physical characteristics were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDS), and Brunauer-Emmett-Teller (BET). The XRD results did not show the presence of silica crystal phase in each sample. The results showed that the highest BET surface area of samples was obtained at the temperature of 650 °C. In sample calcined 500 °C, the activity of the catalyst on MB was relatively similar in both sunlight and ultraviolet rays.

scholarly journals Preparation and Photocatalytic Characterization of Modified TiO2/Nd/rice Husk Ash Nanomaterial for Rifampicin Removal in Aqueous Solution

2021 ◽  
Author(s):  
Thuy Dang Thi Ngoc ◽  
Ha Nguyen Thi ◽  
Anh Ngo Van ◽  
Sen Nguyen Thi ◽  
Dung Nguyen Duc ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Sol Gel ◽  
Solar Irradiation ◽  
Photocatalytic Decomposition ◽  
Structure Characteristic ◽  
Lower Efficiency ◽  
Residue Decomposition ◽  
First Order Kinetics

Abstract The neodymium doping of titanium dioxide with content of Nd varying from 0.01 to 0.8% was conducted by the sol-gel hydrothermic method. TiO2/Nd is then coated on rice husk ash to produce modified TiO2/Nd/rice husk ash material using Nd content of 0.36% w/w. The materials’ structure characteristic and photocatalytic properties have been analyzed by the XRD, EDX, TEM, SEM, forbidden zone energy (Eg) and specific surface area (BET). TiO2/Nd material shows a higher photocatalytic decomposition capacity in comparison to TiO2 and depended on the Nd content. The Rifampicin removal efficiency of TiO2/Nd materials with Nd contents ranged from 0.36 to 0.80% had an increase of about 40% higher than that of TiO2/Nd containing Nd from 0.01 to 0.28%. This new photocatalytic TiO2/Nd/rice husk ash material is used to decompose Rifampicin. Within 90 minutes under sunlight, the Rifampicin decomposed efficiency of TiO2/Nd and TiO2/Nd/rice husk ash material reached about 86 and 75%, respectively. Even lower efficiency was obtained, the latter material was chosen for Rifampicin residue decomposition in the water under sunlight through photocatalytic process because it has some advantages such as smaller amount was needed and easily to be recovered. Rifampicin removal process, k values were found matching more to zero and first order kinetics. Especially, for powder TiO2/Nd and TiO2/Nd/Rice husk ash under solar irradiation the R2 reached about 0.98.

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