1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, P.O. Box 35, No. 15 Bei San Huan Dong Road, Beijing 100029, China
2. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, No. 15 Bei San Huan Dong Road, Beijing 100029, China
3. Department of Chemical & Process Engineering, Moi University, Eldoret 3900-30100, Kenya