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Isolation of Bio‐Mesoporous Silica from Rice Husk
Author(s) -
He JiaRung,
Kuo WeiChiao,
Su ChiShen,
Lin HongPing
Publication year - 2014
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201300658
Subject(s) - husk , hydrothermal circulation , chemistry , citric acid , mesoporous material , mesoporous silica , specific surface area , chemical engineering , nuclear chemistry , organic chemistry , botany , catalysis , engineering , biology
By using a simple and safe citric acid‐hydrothermal treatment, bio‐mesoporous silica with a high surface area (≈200 m 2 g −1 ) and pore size of around 6.0 nm can be isolated from rice husk. We found that the surface area of the isolated porous silica is dependent on the pH value, hydrothermal temperature, and reaction time but independent on the water content. At pH around 2.0‐2.5, the resulted bio‐mesoporous silica possesses the highest surface area regardless to the acid sources. Increasing hydrothermal temperature can accelerate the removal rate of the metal impurity in the rice husk. From the data of the surface areas, the required reaction time to isolate the mesoporous silica of the largest surface area (≈200 m 2 g −1 ) from rice husk increases with decreasing temperature. It takes only about 0.5 hour at 100 °C, 1.0 hour at 60 °C and 12.0 h at room temperature. This citric acid‐hydrothermal treatment can also be applied to isolate bio‐mesoporous silica from Equisetum grass.