1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P. R. China
2. Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, P. R. China
3. Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, Guangxi University, Nanning 530004, P. R. China