1. State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes TianGong University Tianjin 300387 P. R. China
2. School of Textile Science and Engineering TianGong University Tianjin 300387 P. R. China
3. School of Mathematical Sciences TianGong University Tianjin 300387 P. R. China