1. Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, P. R. China
2. College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518071, P. R. China
3. Yiyang Hongyuan Rare Earth Co., Ltd, Yiyang 413001, P. R. China