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 Materials Science and Engineering, Tiangong University, Tianjin 300387, P. R. China
3. College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, 29 13th Avenue, TEDA, Tianjin 300457, P. R. China
4. Institute for Nanotechnology and Water Sustainability College of Science Engineering and Technology, University of South Africa, Science Campus, Florida, Johannesburg 1710, South Africa