1. Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
2. Department of Chemical Science, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia
3. Department of Applied Chemistry & Chemical Engineering, University of Rajshahi, Rajshahi 6205, Bangladesh