title: Formation of intercalation compound of kaolinite-glycine via displacing guest water by glycine.
abstract: The kaolinite-glycine intercalation compound was successfully formed by displacing intercalated guest water molecules in kaolinite hydrate as a precursor. The microstructure of the compound was characterized by X-ray diffraction, Fourier Transform Infrared Spectroscopy and Scanning Electron Microscope. Results show that glycine can only be intercalated into hydrated kaolinite to form glycine-kaolinite by utilizing water molecules as a transition phase. The intercalated glycine molecules were squeezed partially into the ditrigonal holes in the silicate layer, resulting in the interlayer distance of kaolinite reaching 1.03nm. The proper intercalation temperature range was between 20°C and 80°C. An intercalation time of 24h or above was necessary to ensure the complete formation of kaolinite-glycine. The highest intercalation degree of about 84% appeared when the system was reacted at the temperature of 80°C for 48h. There were two activation energies for the intercalation of glycine into kaolinite, one being 21kJ/mol within the temperature range of 20-65°C and the other 5.8kJ/mol between 65°C and 80°C. The intercalation degree (N) and intercalation velocity (v) of as a function of intercalation time (t) can be empirically expressed as N=-79.35e(-)(t)(/14.8)+80.1 and v=5.37e(-)(t)(/14.8), respectively.
authors.affiliation: State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. Electronic address: zhengwan@zju.edu.cn.
authors.forename: Wan
authors.initials: W
authors.lastname: Zheng
authors.affiliation: State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. Electronic address: zw3080103176@zju.edu.cn.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. Electronic address: 21226113@zju.edu.cn.
authors.forename: Zhenqian
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: China Kaolin Clay Company, Suzhou 215151, China. Electronic address: 379327257@qq.com.
authors.forename: Likun
authors.initials: L
authors.lastname: Chen
authors.affiliation: China Kaolin Clay Company, Suzhou 215151, China. Electronic address: 358414371@qq.com.
authors.forename: Zhongfei
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: China Kaolin Clay Company, Suzhou 215151, China. Electronic address: 463202887@qq.com.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Zhejiang University Hospital, Hangzhou 310027, China. Electronic address: mse-dupy@zju.edu.cn.
authors.forename: Ning
authors.initials: N
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. Electronic address: dupy@zju.edu.cn.
authors.forename: Piyi
authors.initials: P
authors.lastname: Du
keywords: Formation; Guest displacement; Hydrated kaolinite; Intercalation; Kaolinite–glycine; Mechanism