Arpan Sarkar1, Biswajit Paul2. 1. Department of Environmental Science & Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, Jharkhand, India. 2. Department of Environmental Science & Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, Jharkhand, India. Electronic address: dr.bpaul@gmail.com.