Preliminary investigation on the physicochemical properties of calcium ferrate(VI) |
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| Affiliation: | 1. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P.R. China;2. Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, P.R. China;3. International Joint Research Center for Sustainable Urban Water System, Tongji University, Shanghai, 200092, P.R. China;4. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P.R. China |
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| Abstract: | Calcium ferrate(VI) powders were synthesized from potassium ferrate(VI), and characterized by titration analysis, elemental analyzer, SEM, XRD, IR, TG and DSC. The results showed that the synthesized sample mainly consists of calcium ferrate(VI), and calcium ferrate(VI) may exist as CaFeO4 · 2H2O with a highest obtained purity of 74.9%. The relatively higher Fe(III) impurity and crystalloid water might be responsible for the poor stability of the calcium ferrate(VI) sample. The results of galvanostatic discharge experiments indicated that the calcium ferrate (VI) sample displays better intrinsic rate discharge capability and larger discharge capacity at lower temperatures (⩽15 °C). |
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