Preparation and characterization of Co3O4 by wet precipitation-thermal decomposition with oxalate
LI Hui-ying1,WANG Wen-xiang1,LIU Ying1,YAN Ying-yan1,LIU Zhi-hong2
(1. Department of Heavy Metal Pollution Control and Comprehensive Utilization of Resources Key Laboratory,Guangdong Polytechnic of Environmental Protection Engineering,Foshan 528216,China 2. School of Metallurgy and Environment,Central South University,Changsha 410083,China)
Abstract:The cobalt oxide precursor was prepared by wet precipitation method with cobalt chloride as cobalt source,ammonium oxalate as precipitating agent,and Tween-80 as surfactant. The Co3O4 powder was obtained by thermal decomposition method. The morphology,crystal structure and thermal decomposition of precursor particles and Co3O4 powder were characterized by scanning electron microscope,X-ray diffractometer and thermal analyzer. Results show that the precursor of cobalt oxide prepared with oxalate as precipitant is CoC2O4·2H2O. Relatively pure Co3O4 powder can be obtained when the precursor is calcined at 600 ℃ for 4 h. The Co3O4 powder basically maintains the original shape of precursor,which are still needle (rod) shape and the edge of the particles become smooth.
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