1. Department of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
2. Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, P. R. China
3. Department of Chemical Engineering, University of Cape Town, Corner of Madiba Circle and South Lane Rondebosch, Cape Town 7701, South Africa