Pedosphere 11(2): 159--166, 2001
ISSN 1002-0160/CN 32-1315/P
©2001 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Adsorption of environmental pollutants on pillared montmorillonite |
| WU Ping-Xiao1, GUO Jiu-Gao2, ZHANG Hui-Fen2 and LIAO Zong-Wen3 |
1 Department of Environmental Science and Engineering, South China University of Technology, Guangzhou 510640 (China);
2 Guangzhou Institute of Geochemistry, the Chinese Academy of Sciences, Guangzhou 510640 (China);
3 College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642 (China) |
| ABSTRACT |
| Both inorganic and organic pillared montmorillonites were used to adsorb phenol. Batch kinetics and isotherm studies were carried out to evaluate the effect of equilibrium time and pH on adsorption of phenol by montmorillonites and re-adsorbing characteristics of pillared montmorillonites. The adsorption of phenol increased with increasing solution pH values. The elimination ratio of phenol from the solution by the absorption of organic modified pillared montmorillonite (OrPMt) reached equilibrium quickly after vibrating for 5 minutes. Meanwhile for organic montmorillonite (OrMt), pillared montmorillonite (PMt) and montmorillonite (Mt), the time to reach phenol-absorption equilibrium were 20, 30 and 90 minutes, respectively. The adsorbing capacity of the pillared montmorillonite modified with surfactant improved greatly. The phenol-adsorbing capacity of pillared montmorillonites mainly depended on microporous structure and surface component of the modified clays. After calcination at 500 ℃, the pillar structure and the basal spacing (1.83 nm) were still stable. So the pillared montmorillonite could be recycled, and it was a potential material for adsorbing environmental pollutants. |
| Key Words: adsorption, phenol, pillared montmorillonite |
| Citation: Wu, P. X., Guo, J. G., Zhang, H. F. and Liao, Z. W. 2001. Adsorption of environmental pollutants on pillared montmorillonite. Pedosphere. 11(2): 159-166. |
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