A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Preparation of porous silica from vermiculite by selective leaching
AbstractHigh surface area silica was obtained by selectively leaching vermiculite. The influence of acid concentration and leaching time on the porous properties of silica was studied. Leaching with 2 M HCl at 80 °C for 2 h produced a maximum value of surface area (672 m2/g) with total pore volume of 0.44 ml/g. The 29Si MAS NMR spectra of the leached products indicate mainly Q3 and Q4 structural units, assigned as layer and framework structures, respectively. The layer structure is responsible for forming micropores and the framework structure forms mesopores. The number of micropores decreased with longer leaching time, the micropores condensing to increase the framework structure. The characteristics of the porous silica obtained from vermiculite are compared with those from other clay minerals.
Preparation of porous silica from vermiculite by selective leaching
AbstractHigh surface area silica was obtained by selectively leaching vermiculite. The influence of acid concentration and leaching time on the porous properties of silica was studied. Leaching with 2 M HCl at 80 °C for 2 h produced a maximum value of surface area (672 m2/g) with total pore volume of 0.44 ml/g. The 29Si MAS NMR spectra of the leached products indicate mainly Q3 and Q4 structural units, assigned as layer and framework structures, respectively. The layer structure is responsible for forming micropores and the framework structure forms mesopores. The number of micropores decreased with longer leaching time, the micropores condensing to increase the framework structure. The characteristics of the porous silica obtained from vermiculite are compared with those from other clay minerals.
Preparation of porous silica from vermiculite by selective leaching
Temuujin, Jadambaa (author) / Okada, Kiyoshi (author) / MacKenzie, Kenneth J.D (author)
Applied Clay Science ; 22 ; 187-195
2002-12-03
9 pages
Article (Journal)
Electronic Resource
English
Preparation of porous silica from vermiculite by selective leaching
| Online Contents | 2003
Preparation of porous silica from chlorite by selective acid leaching
| Online Contents | 2005
Preparation of porous silica from chlorite by selective acid leaching
| Elsevier | 2005
| British Library Online Contents | 2008
Effect of ultrasound on preparation of porous materials from vermiculite
| Online Contents | 2005