1. Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China
2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, P. R. China
3. School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, P. R. China