Study on Microstructure Variation Laws of Al-Pillared Montmorillonite
| Periodical | Advanced Materials Research (Volume 158) |
|---|---|
| Main Theme | Powder Technology and Application III |
| Edited by | Xianjun Lu and Jun Qiu |
| Pages | 248-255 |
| DOI | 10.4028/www.scientific.net/AMR.158.248 |
| Citation | Gui Fang Wang et al., 2010, Advanced Materials Research, 158, 248 |
| Online since | November, 2010 |
| Authors | Gui Fang Wang, Xian Jun Lu, Shuai Zhang, Shao Jian Ma, Jun Qiu, Jin Lin Yang |
| Keywords | Al-Pillared Montmorillonite, Microstructure, Porosity, Specific Surface-Area |
| Price | US$ 28,- |
Al3+/clay ratio is one of the important factors influencing microstructure of Al-pillared montmorillonite. Microstructure variation laws of Al-pillared montmorillonite prepared under the condition of different Al3+/clay ratio are systematically studied by XRD, FTIR, specific surface area and pore size analysis. The results show that the interlayer spacing and BET specific surface area of Al-pillared montmorillonite are remarkably affected by the Al3+/clay ratio. The interlayer spacing d(001) value and BET specific surface area of Al-pillared montmorillonite increase firstly and then decrease with the increases of the Al3+/clay ratio, and they reach to maximum when the Al3+/clay ratio is 10mmol/g. Besides, the BJH porous volume distribution of Al-pillared montmorillonite is the most probable distribution, and the most probable pore size is about 2 nm, which is attributed to mesopore. The porous structure of hydroxy-Al pillared montmorillonite is characterized as parallel plate slit or “house-of-cards” wedge-shaped pore which is formed by novel meso-microporous delaminated structure and fragments. With the increase of the Al3+/clay ratio, BJH total porous volume and mesoporous volume of hydroxy-Al pillared montmorillonite decreases, while the proportion of microporous volume in the total porous volume increases. The proportion of microporous specific surface area of all the hydroxy-Al pillared montmorillonite samples is about 62% and is much larger than that of Na-M and those of mesopore and macropore, indicating the main action of intercalation of hydroxy-Al pillaring solution into montmorillonite interlayer is to increase the micropore amount.
