1. Department of Chemical Engineering, Tsinghua University, 100084, Beijing, P. R. China, Department of Applied Chemistry, Iwate University, 3-5, Ueda 4, Morioka-shi, Iwate, 020-8551, Japan, Tianjin University of Science and Technology, College of Marine Science of Technology, Street 13, No. 29, 300457, TEDA, Tianjin, P. R. China, and Department of Chemical Technology, Lappeenranta University of Technology, P.O. Box 20, FI-53851, Lappeenranta, Finland