标题：Isothermal adsorption of alkylammonium in middle charged montmorillonite
作者：Qiu, Jun ;Liu, Dian-Biao ;Chen, Ping ;Cao, Xiao-Qiang
作者机构：[Qiu, Jun ;Liu, Dian-Biao ;Chen, Ping ;Cao, Xiao-Qiang ] College of Chemical and Environmental Engineering, Shandong University of Science and Technol 更多
来源：Gongneng Cailiao/Journal of Functional Materials
摘要：Montmorillonite/alkylammonium compound is a mineral composites with high added value, the adsorption amount was closely related to the gel performance of the composite. In this paper, on base of purification and sodium modification of the lower charged bentonite from Shandong Province, at 80°C, adsorption characteristics of octadecyl trimethyl ammonium (OTAC), cetyl trimethylammonium (CTAC) and tetradecyl trimethyl ammonium (TTAC) in montmorillonite are systematically researched. The research results are as the following: at a higher dosage in the organic system, all the three alkylamines exhibit excessive adsorption characteristics in montmorillonite interlayers, the saturated adsorption amount increases with he length of the carbon chain in the alkylammonium. The isothermal adsorption of the three alkylamines are fitted well with modified langmuir models, the fitting degree of the three alkylamines are respectively 0.992, 0.986, 0.977. Correspondingly the saturated extent of adsorption of OTAC, CTAC and TTAC are 2.101, 2.042, 1.760 mmol/g, which fit well with the experimental data.