1. Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, Doha, Qatar
2. College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, P.O. Box 5825, Doha, Qatar
3. Chemical Engineering Department, College of Engineering & Mines (CEM), University of North Dakota, Grand Forks, ND, USA