1. Research Center for Ultrafine Powder Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
2. School of Chemistry and Materials Engineering, Huizhou University, Huizhou 516007, P. R. China
3. Guangdong Province Key Laboratory of Rare Earth Development and Application, Institute of Resources Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangzhou 510651, P.R. China
4. School of Marine Sciences Sun Yat-Sen University Zhuhai 519082, P. R. China