Sulfonated rice husk ash (RHA-SO3H) as a highly efficient and reusable catalyst for the synthesis of some bis-heterocyclic compounds

RSC Advances ◽  
2013 ◽  
Vol 3 (46) ◽  
pp. 24046 ◽  
Author(s):  
Mohadeseh Seddighi ◽  
Farhad Shirini ◽  
Manouchehr Mamaghani
Keyword(s):  
Rice Husk ◽  
Heterocyclic Compounds ◽  
Rice Husk Ash ◽  
Reusable Catalyst ◽  
Highly Efficient

Preparation and characterization of a RHA/TiO2 nanocomposite: introduction of an efficient and reusable catalyst for chemoselective trimethylsilyl protection and deprotection of alcohols and phenols

RSC Advances ◽  
2016 ◽  
Vol 6 (28) ◽  
pp. 23564-23570 ◽  
Author(s):  
Mohadeseh Seddighi ◽  
Farhad Shirini ◽  
Omid Goli-Jolodar
Keyword(s):  
Rice Husk ◽  
Amorphous Silica ◽  
Rice Husk Ash ◽  
Anatase Phase ◽  
Natural Source ◽  
Titania Nanoparticles ◽  
Reusable Catalyst

In this work, rice husk ash (RHA), as a natural source of amorphous silica, was used as a support for the synthesis of anatase-phase titania nanoparticles leading to the RHA/TiO2 nanocomposite.

Mechanoactivation Of Rice Husk Ash In Laboratory Conditions

2019 ◽  
pp. 20-26
Keyword(s):  
Mechanical Activation ◽  
Rice Husk ◽  
Amorphous Silica ◽  
Silicon Oxide ◽  
Rice Husk Ash ◽  
Pozzolanic Activity ◽  
Maximum Solubility ◽  
Laboratory Conditions ◽  
Before And After ◽  
Mineral Additive

In many rice producing countries of the world, including in Vietnam, various research aimed at using rice husk ash (RHA) as a finely dispersed active mineral additive in cements, concrete and mortars are being conducted. The effect of the duration of the mechanoactivation of the RHA, produced under laboratory conditions in Vietnam, on its pozzolanic activity were investigated in this study. The composition of ash was investigated by laser granulometry and the values of indicators characterizing the dispersion of its particles before and after mechanical activation were established. The content of soluble amorphous silicon oxide in rice husk ash samples was determined by photocolorimetric analysis. The pizzolanic activity of the RHA, fly ash and the silica fume was also compared according to the method of absorption of the solution of the active mineral additive. It is established that the duration of the mechanical activation of rice husk ash by grinding in a vibratory mill is optimal for increasing its pozzolanic activity, since it simultaneously results in the production of the most dispersed ash particles with the highest specific surface area and maximum solubility of the amorphous silica contained in it. Longer grinding does not lead to further reduction in the size of ash particles, which can be explained by their aggregation, and also reduces the solubility of amorphous silica in an aqueous alkaline medium.

Desalination Technology of Water by using Rice Husk Ash

2014 ◽  
Vol 27 (2) ◽  
pp. 148-160
Author(s):  
Hassan K. Hassan ◽  
Najla J. Al-Amiri ◽  
Mohammed M. Yassen
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Desalination Technology

Adsorption of Cr(VI) by material synthesized from red mud and rice husk ash

2018 ◽  
Vol 60 (4) ◽  
pp. 3-7
Author(s):  
Thi To Yen Nguyen ◽  
Phung Anh Nguyen ◽  
Thi Thuy Van Nguyen ◽  
Tri Nguyen ◽  
Ky Phuong Ha Huynh ◽  
...  
Keyword(s):  
Rice Husk ◽  
Red Mud ◽  
Rice Husk Ash
Sign in / Sign up

Export Citation Format

Share Document