Preparation of Potassium Ferrate from Spent Steel Pickling Liquid
AbstractPotassium ferrate (K2FeO4) is a multi-functional green reagent for water treatment with considerable combined effectiveness in oxidization, disinfection, coagulation, sterilization, adsorption, and deodorization, producing environment friendly Fe(III) end-products during the reactions. This study uses a simple method to lower Fe(VI) preparation cost by recycling iron from a spent steel pickling liquid as an iron source for preparing potassium ferrate with a wet oxidation method. The recycled iron is in powder form of ferrous (93%) and ferric chlorides (7%), as determined by X-ray Absorption Near Edge Spectrum (XANES) simulation. The synthesis method involves three steps, namely, oxidation of ferrous/ferric ions to form ferrate with NaOCl under alkaline conditions, substitution of sodium with potassium to form potassium ferrate, and continuously washing impurities with various organic solvents off the in-house ferrate. Characterization of the in-house product with various instruments, such as scanning electron microscopy (SEM), ultraviolet-visible (UV-Vis), X-ray diffraction (XRD), and X-ray absorption spectroscopy (XAS), proves that product quality and purity are comparative to a commercialized one. Methylene blue (MB) de-colorization tests with in-house potassium ferrate shows that, within 30 min, almost all MB molecules are de-colorized at a Fe/carbon mole ratio of 2/1. View Full-Text
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Wei, Y.-L.; Wang, Y.-S.; Liu, C.-H. Preparation of Potassium Ferrate from Spent Steel Pickling Liquid. Metals 2015, 5, 1770-1787.
Wei Y-L, Wang Y-S, Liu C-H. Preparation of Potassium Ferrate from Spent Steel Pickling Liquid. Metals. 2015; 5(4):1770-1787.Chicago/Turabian Style
Wei, Yu-Ling; Wang, Yu-Shun; Liu, Chia-Hung. 2015. "Preparation of Potassium Ferrate from Spent Steel Pickling Liquid." Metals 5, no. 4: 1770-1787.