1. Department of Chemistry and Centre of Advanced Studies
2. Panjab University
3. Chandigarh-160014
4. India
5. Department of Chemistry
6. College of Science and Arts
7. Najran University
8. P. O. Box-1988
9. Najran-11001
10. Department of Chemical Engineering, University of Hull
11. Hull
12. UK
13. Dr. S. S. Bhatnagar University Institute of Chemical Engineering and Technology