Department of Chemistry;
Faculty of Science;
University of Malaya;
Kuala Lumpur 50603;
Malaysia;
Department of Chemical Engineering;
Faculty of Engineering;
University of Malaya;
Kuala Lumpur 50603;
Malaysia;
Department of Chemical Engineering;
Faculty of Engineering;
Dawood University of Engineering and Technology;
MA Jinnah Road;
Karachi 74800;
Pakistan;