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- Title
Preparation of Potassium Ferrate from Spent Steel Pickling Liquid.
- Authors
Yu-Ling Wei; Yu-Shun Wang; Chia-Hung Liu
- Abstract
Potassium 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.
- Subjects
STEEL -- Pickling; POTASSIUM ferrate; IRON compounds; STEEL; CORROSION &; anti-corrosives; ELECTROPLATING; METAL pickling; METAL cleaning
- Publication
Metals (2075-4701), 2015, Vol 5, Issue 4, p1770
- ISSN
2075-4701
- Publication type
Article
- DOI
10.3390/met5041770