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Potassium Ferrite (KFeO2): Synthesis, Decomposition, and Application for Removal of Metals

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Potassium ferrite (KFeO2) was synthesized by a new simple thermal process from natural waste ferrihydrite and KNO3 precursors. The synthesized KFeO2 showed considerable instability when it was in contact with water and CO2 of the humid air. The decomposition of KFeO2 followed first-order kinetics with rate constants as 0.93 × 10–1 h–1 and 1.86 × 10–1 h–1 at relative humidity of 30–35% and 65–70%, respectively. The products of decomposition, crystalline KHCO3 and nanocrystalline iron(III) oxides in the molar ratio of 2:1, were characterized in detail by X-ray powder diffraction, low-temperature and in-field 57Fe Mössbauer spectroscopy, magnetization (SQUID) measurements, thermal analysis, and scanning and transmission electron microscopy. Washing and subsequent air drying of the decomposed products of KFeO2 yielded monodisperse superparamagnetic maghemite (γ-Fe2O3) nanoparticles, which turned out to be efficient as magnetic sorbents for removing Cu2+ in water. A direct addition of solid KFeO2 into water containing Cu2+ ions yielded rapid coagulation of iron(III) oxyhydroxides, which subsequently removed Cu2+ more efficiently compared to its sorption on the pre-formed maghemite nanoparticles.
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Keywords: ADSORPTION; MÖ MAGNETIC MATERIALS; METAL REMOVAL; NANOSTRUCTURES; POTASSIUM IRON(III) OXIDE; SSBAUER SPECTROSCOPY; THERMAL SYNTHESIS

Document Type: Research Article

Publication date: 01 March 2015

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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