Continuous synthesis of fine MgFe2O4 nanoparticles by supercritical hydrothermal reaction |
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| Affiliation: | 1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;2. Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China;3. College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China;4. School of Business, Central South University, Changsha 410083, PR China |
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| Abstract: | We produced magnesium ferrite (MgFe2O4) nanoparticles by hydrothermal synthesis in supercritical water. Suspensions containing varying ratios of Mg(OH)2 and Fe(OH)3 at room temperature were pressurized to 30 MPa, fed into a tubular reactor by high-pressure pump, and rapidly heated to reaction temperature by mixing with supercritical water. The MgFe2O4 phase forms at 460 °C. The Mg/Fe molar ratio was varied from 0.5 to 1.5 with the goal of obtaining single-phase MgFe2O4. At the stoichiometric ratio for MgFe2O4, Mg/Fe = 0.5, the product contains both MgFe2O4 and α-Fe2O3. At Mg/Fe = 1.0 and 1.5, the product is the desired single-phase MgFe2O4. The synthesized MgFe2O4 nanoparticles, with particle size of about 20 nm, exhibit superparamagnetic behavior. |
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