1. College of Materials Science and Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Shibei District, Qingdao 266042, P. R. China.
2. Shandong Peninsula Engineering Research Center of Comprehensive Brine Utilization, Weifang University of Science and Technology, 1299 Jinguang Street, Shouguang District, Weifang 262700, P. R. China