Efficient preparation of two-dimensional vermiculite flakes based on thermal expansion-ultrasonic stripping method
Two-dimensional vermiculite sheets(2D-V)have shown great application potential in the fields of envi-ronmental governance,energy storage and catalysis due to their excellent thermal stability,adsorption performance and ion exchange capacity.In this paper,the optimum conditions for the preparation of 2D-V by thermal expansion-ultrasonic stripping method were discussed.The expanded and exfoliated vermiculite were characterized by scanning electron microscopy,physical adsorption test,X-ray diffraction and other methods.The results show that the opti-mum thermal expansion temperature is 700℃and the expansion time is 300 s.At this time,the expansion rate of vermiculite can reach 6.32 times of the original volume,which provide a good structural basis for ultrasonic stripping.After high-speed stirring for 30 min,ultrasonic treatment for 180 min,and standing precipitation for 12 h,2D-V is successfully prepared with a yield of 22.5%.The prepared 2D-V has ultra-thin thickness,large specific surface area and mesoporous structure.The research results provide an economical and feasible new method for the efficient prepa-ration of 2D-V.
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