1. Department of Environmental Engineering, North China Electric Power University, 689 Huadian Road, Baoding, Hebei 071003, P. R. China
2. Department of Chemical Engineering, University of New Brunswick, 15 Dineen Drive, Fredericton E3B 5A3, Canada
3. Guangxi Key Lab of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning, Guangxi 530004, P. R. China