Synthesis of hexagonal β-Co(OH)2 nano-platelets with high catalytic activity via a low-temperature precipitation method |
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| Authors: | ZhenZhen Xu ZhongLin Chen Yue Ben JiMin Shen |
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| Affiliation: | 1. Department of Energy and Material Sciences, Faculty of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;2. Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8569, Japan;1. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, PR China;2. Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, PR China;3. Beijing Key Laboratory of Radioactive Waste Treatment, INET, Tsinghua University, Beijing 100084, PR China;1. State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China;2. National and Provincial Joint Engineering Laboratory of Wetland Ecological Conservation, Heilongjiang Academy of Science, Harbin 150040, PR China |
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| Abstract: | Large-scale β-Co(OH)2 hexagonal nano-platelets have been synthesized successfully at 70 °C using only CoCl2 and NaOH as reactants. The physicochemical features of the β-Co(OH)2 hexagonal nano-platelets were characterized by X-ray diffraction (XRD), thermal gravimetric analysis (TGA), scanning electron microscopy (SEM) and nitrogen absorption–desorption. Results showed that the β-Co(OH)2 obtained consisted of thin, regular, hexagonal nano-platelets with diameters and thicknesses of 50–300 nm and 30–80 nm, respectively. A transformation from β-Co(OH)2 to Co3O4 was observed in the temperature range 160–220 °C. The average pore-size and the Brunauer–Emmet–Teller (BET) surface area of the synthesized β-Co(OH)2 were 16.76 nm and 29.45 m2/g. The prepared product had a significant effect on the catalytic decomposition of ozone. |
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