1. Ph.D. Student, Dept. of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
2. Assistant Professor, Dept. of Chemistry, Univ. of Gondar, Gondar 196, Ethiopia.
3. Ph.D. Student, Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
4. Professor, Dept. of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
5. Professor, Dept. of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India (corresponding author).