Citation: LIU Qin-Fu, ZUO Xiao-Chao, ZHANG Shi-Long, ZHANG Shuai, JI Jing-Chao. Synthesis and Possible Modeling of Kaolinite-Stearic Acid Intercalation Compound[J]. Chinese Journal of Inorganic Chemistry, ;2015, (1): 7-14. doi: 10.11862/CJIC.2015.035 shu

Synthesis and Possible Modeling of Kaolinite-Stearic Acid Intercalation Compound

1.
1. College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China;
2.
2. School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China

Corresponding author: LIU Qin-Fu,
Received Date: 29 July 2014
Available Online: 10 October 2014
Fund Project: 国家自然科学基金(No.51034006)重点项目 (No.51034006)

Kaolinite-stearic acid intercalation compound was synthesized via intercalation and displacement using kaolinite from Zhangjiakou as raw material. The new intercalation compounds were characterized by X-ray diffraction(XRD), Fourier transform infrared spectracopy(FTIR),Thermal Gravity Analysis(TG/DTG) and Transmission Electron Microscope(TEM). Experimental results show that the basal spacing of kaolinite-stearic acid intercalation compound is 4.05~4.37 nm and the intercalationrate of the product reaches to 86.9%. The intercalation time and the pHvalue of the solution have influence on the basal spacing and intercalationrate.The methoxy groups which were grafted with iner surface OH groups and the stearic acid molecules are inside the interlayers of the kaolinite.The TG/DTG Analyses were to conform that the activity of kaolinite hydroxyl increased after methanol modified. Some sheets of the kaolinite-stearic acid compound have rolled up from the edge and formed nanoscrolls which is similar with halloysite. The possible intercalation mechanism is analyzed. A model was provided by structural computation in theory. The results show that the reason about the changed spacings of the compounds in different conditions is explained by the model.
- kaolinite;stearic acid;intercalation;nanoscroll;structure
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