[1] Indian Inst Technol BHU, Dept Chem Engn & Technol, Varanasi 221005, Uttar Pradesh, India
[2] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India
[3] Indian Inst Technol BHU, Dept Chem, Varanasi, Uttar Pradesh, India
[4] Univ Delhi, PGDAV Coll, Dept Environm Studies, Delhi 110065, India
[5] Sam Higginbottom Inst Agr Technol & Sci, Dept Biol Sci, Allahabad 221007, Uttar Pradesh, India