1. Key Laboratory of Green and High-end Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, PR China
2. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, Qinghai 810008, PR China
3. University of Chinese Academy of Sciences, Beijing 100049, PR China
4. School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, PR China