1 School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia. chsclow@usm.my.
2 Center of Excellence for Green Energy and Environmental Nanomaterials (CE@GrEEN), Nguyen Tat Thanh University, 300A Nguyen Tat Thanh, District 4, Ho Chi Minh City, 755414, Vietnam.
3 Department of Chemical Engineering, College of Engineering, Qatar University, Doha, P.O. Box 2713, Qatar.
4 Faculty of Chemical & Process Engineering Technology, Universiti Malaysia Pahang Al- Sultan Abdullah, Lebuhraya Persiaran Tun Khalil Yaakob, 26300 Gambang, Kuantan, Pahang, Malaysia.