1. Chemistry Department, Ekiti state University, Ado-Ekiti, Nigeria
2. Industrial Chemistry Department, Federal University Oye-Ekiti, Oye-Ekiti, Nigeria
3. Mechanical Engineering Department, Ekiti State University, Ado-Ekiti, Nigeria
4. Institute of Technische Chemie, TU-Clausthal, Clausthal-Zellefeld, Germany