Hawaiah Imam Maarof
* Corresponding Author
Fax: +604-5941013

Bassim H. Hameed
Fax: +604-5941013

Abdul Latif Ahmad
School of Chemical Engineering, Engineering Campus University Science Malaysia, Seri Ampangan, Nibong Tebal, 14300 Seberang Perai Selatan, Pulau Pinang, Malaysia