关键词: 黑滑石;酸活化;Zn置换;晶格重建;抗菌能力

Abstract: Black talc is a common layered silicate.Calcined black talc from Guangfeng, Jiangxi was activated by 2 mol·L-1 HCl solutions at 80 ℃ hydrothermal conditions with solid/liquid ratio of 1∶10.XRD results indicated that the crystal structures of enstatite and wollastonite were destroyed by the acid treatment.During the acid activation, Mg2+ in the octahedral structure of enstatite was replaced by H+.The surface morphology was eroded and the erosion depth increased with activation time.The acid activated talc was subsequently treated by ZnSO4 solutions.The relative intensities of peaks of enstatite and wollastonite increased gradually, and the crystal parameters such as full width at half maximum also gradually recovered.It is suggested that the crystal structure of calcined talc has been reconstructed by the incorporation of Zn2+ ions into the octahedral lattice.The Zn-reconstructed product exhibited enhanced antibacterial performance against Staphylococcus aureus and Escherichia colifurther with respect to the original calcined talc.This study provided a potential method to prepare functional talc materials, which could greatly extend the potential applications of black talc.

Key words: black talc;acid activation;Zn2+-substitution;lattice reconstruction;antibacterial activity