1. Department of Environmental Sciences; Fatima Jinnah Women University; Rawalpindi 46000 Pakistan
2. Nanoscience and Technology Department; National Centre for Physics, Quaid-i-Azam University Campus; Islamabad 44000 Pakistan
3. Department of Chemistry; Quaid-i-Azam University; Islamabad 44000 Pakistan
4. Department of Chemistry; Government Post Graduate College (GPGC); Jhelum 49600 Pakistan