1. Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
2. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co, Ltd, Panzhihua 617000, P. R. China
3. Analytical & Testing Centre, Sichuan University, Chengdu 610064, P. R. China