**Author details**

Wan Azlina Wan Ab Karim Ghani1 and Azil Bahari Alias2

1 Department of Chemical and Environmental Engineering, the Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

2 Faculty of Chemical Engineering, University Technology MARA, 40450 Shah Alam, Selan‐ gor, Malaysia
