1. Key Lab New Processing Technology for Nonferrous Metals & Materials Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
2. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
3. College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, P. R. China