1. Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences, Lahore 54792, Pakistan
2. School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an, 710072, P. R China
3. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei, People's Republic of China
4. Department of Environmental Engineering, Technical University of Denmark, DTU, 2800 Kgs. Lyngby, Denmark