1. Faculty of Chemical and Natural Resources Engineering, University Malaysia Pahang-UMP, Lebuhraya Tun Razak, 26300 Gambang, Kuantan, Malaysia E-mail: nour2000_99@yahoo.com
2. Faculty of Industrial Sciences and Technology, University of Malaysia Pahang-UMP, Lebuhraya Tun Razak, 26300 Gambang, Kuantan, Malaysia