Adsorption thermodynamics of long chain alkylammoniums in the interlayer of montmorillonite

作者：Lü Xianjun; Chen Ping

来源：Journal of the Chinese Ceramic Society, 2011, 39(10): 1553-1558.

DOI：CNKI:11-2310/TQ.20110927.1349.005

• Adsorption temperature
• Adsorption thermodynamics
• Alkylammonium
• Interaction mechanisms
• Isothermal adsorption
• Langmuir adsorption model
• Langmuirs
• Long carbon chains
• Long chains
• Montmorillonite interlayer
• Na-montmorillonite
• Physical adsorption
• Quaternary ammonium
• Surface films

Octadecyltrimethyl ammonium (OTA) was intercalated into Na-montmorillonite samples. The adsorption thermodynamics and interaction mechanism of the long carbon chain alkyl quaternary ammonium onto montmorillonite were discussed, based on the investigation of the isothermal adsorption of OTA in the interlayer of montmorillonite at different temperatures. The results indicate that the isothermal adsorption of OTA can be described by the Langmuir and modified Langmuir adsorption models, and the adsorption is a spontaneous exothermic reaction. The adsorption exhibited a physical adsorption. The amount of alkylammonium adsorbed in the montmorillonite interlayer spacing decreased with increasing the adsorption temperature. The analysis by X-ray diffraction shows that the state of the adsorbed OTA evolves from "surface film"to "partition phase"when the loading increases.

• 出版日期2011
• 单位山东科技大学