1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
2. Department of Physics, University of Lahore, 53700 Lahore, Pakistan
3. Department of Chemistry, University of Education Lahore, 53700 Lahore, Pakistan
4. School of Sciences, Tianjin University, China
5. Chemistry Department, Faculty of Science, King Khalid University, P. O. Box 9004, Abha, 61413, Saudi Arabia
6. Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
7. School of Chemical Engineering, Birmingham University, Birmingham, UK
8. Department of Physics, University of Education, Lahore, Punjab 54770, Pakistan