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Formation of 0.84 Nm Hydrated Kaolinite as an Environmentally Friendly Precursor of a Kaolinite Intercalation Compound

Published online by Cambridge University Press:  01 January 2024

Jing Zhou
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Wan Zheng
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Jianfeng Xu
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Likun Chen
Affiliation:
China Kaolin Clay Company, Suzhou, Jiangsu 215151, China
Zhongfei Zhang
Affiliation:
China Kaolin Clay Company, Suzhou, Jiangsu 215151, China
Yong Li
Affiliation:
China Kaolin Clay Company, Suzhou, Jiangsu 215151, China
Ning Ma
Affiliation:
Zhejiang University Hospital, Hangzhou 310027, China
Piyi Du*
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
*
*E-mail address of corresponding author: dupy@zju.edu.cn

Abstract

Creating an environmentally friendly precursor to form a kaolinite intercalation compound is important for promoting the applications of nanohybrid kaolinite in electrochemical sensors, low- or zero-toxicity drug carriers, and clay-polymer nanocompounds. In the present study, a stable hydrated kaolinite pre-cursor with d001= 0.84 nm was prepared successfully by heating the transition phase, the as-prepared kaolinite-hydrazine intercalate, at temperatures between 40 and 70ºC. The structure of the hydrated kaolinite was characterized by X-ray diffraction and infrared spectroscopy. The morphology was examined using scanning electron microscopy. The results showed that the hydrated hydrazine of the transition phase was easy to decompose to hydrazines and water molecules in the interlayer at 40-70ºC. Hydrazine molecules de-intercalated gradually, and water molecules remained in the ditrigonal holes of the silicate layer with sufficient stability, finally forming the stable 0.84 nm hydrated kaolinite in the system with a success rate of 80–90%. The 0.84 nm hydrated kaolinite may become an excellent precursor for the preparation of other kaolinite intercalates. A degree of intercalation of ~100% was obtained for the kaolinite-ethylene glycol intercalate, and a degree of intercalation of ~80% was obtained for the kaolinite-glycine intercalate from the 0.84 nm hydrated kaolinite precursor.

Type
Article
Copyright
Copyright © Clay Minerals Society 2013

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