1. College of Chemistry and Chemical Engineering Central South University Changsha Hunan 410083 PR China
2. Engineering Research Center of Nano-geomaterials of Ministry of Education China University of Geosciences Wuhan Hubei 430074 P. R. China
3. Faculity of Materials Science and Chemistry China University of Geosciences Wuhan Hubei 430074 P. R. China
4. Key Laboratory of Functional Geomaterials in China Nonmetallic Minerals Industry China University of Geosciences Wuhan Hubei 430074 P. R. China