1. Department of Chemical Engineering , Indian Institute of Technology Guwahati , Guwahati , Assam 781039 , India
2. Isotope and Radiation Application Division , Bhabha Atomic Research Centre , Trombay , Mumbai 400085 , India
3. Department of Chemical Engineering and Technology , Indian Institute of Technology (BHU) , Varanasi , Uttar Pradesh 221005 , India