Faculty of Science, University of Douala, Cameroon and Industrial Filtration and Water Treatment (Chemical Engineering) Group, Department of Process Engineering, ENSAI, University of Ngaoundere, Cameroon

Department of Chemical and Mining Engineering, University of Dar es Salaam, Tanzania

Department of Physics, Faculty of Science, Egerton University, Kenya.

School of Education, Social Work and Community Education, University of Dundee, Dundee, Scotland

Department of Science and Technology Education, University of Lagos, Akoka-Yaba, Lagos, Lagos State, Nigeria