1. National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huaian 223003, China
2. Jiangsu Provincial Key Laboratory of Palygorskite Science and Applied Technology, Huaiyin Institute of Technology, Huaian 223003, P. R. China
3. Institute of Green Chemistry and Process Enhancement Technology, Huaiyin Institute of Technology, Huaian 223003, P. R. China