| Preparation of Black Amorphous
Silica from Rice Husks |
R. V. Krishnarao, J. Subrahmanyam and T. Jagadishkumar
Pages : 95-99
DOI:10.1080/0371750X.2001.10799976 |
| Abstract |
| The formation of black (carbon containing) amorphous silica from
rice husks has been studied in detail. Three parameters, viz., (i)
purity, (li) temperature of calcination and (iii) rate of heating have
been found to affect the formation of black silica. The formation
of black silica is higher in untreated rice husks than that in acid
treated rice husks. The tendency to form black silica in"creases
with the increase in the heating rate and the temperature of calcination
of untreated rice husks. By treating with 3N HCI acid
the formation of black silica can be avoided. Using a dopant/
catalyst, black amorphous silica stable in air up to 1000°C was
prepared from acid treated rice husks. |
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