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Metals 2015, 5(4), 1770-1787; doi:10.3390/met5041770

Preparation of Potassium Ferrate from Spent Steel Pickling Liquid

Department of Environmental Science and Engineering, Tunghai University, Taichung 40704, Taiwan
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Academic Editors: Suresh Bhargava and Rahul Ram
Received: 31 July 2015 / Revised: 7 September 2015 / Accepted: 18 September 2015 / Published: 24 September 2015
(This article belongs to the Special Issue Hydrometallurgy)
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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. View Full-Text
Keywords: potassium ferrate; wet oxidation method; steel pickling liquid; ferrous chloride; ferric chloride; Fe k-edge XAS potassium ferrate; wet oxidation method; steel pickling liquid; ferrous chloride; ferric chloride; Fe k-edge XAS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wei, Y.-L.; Wang, Y.-S.; Liu, C.-H. Preparation of Potassium Ferrate from Spent Steel Pickling Liquid. Metals 2015, 5, 1770-1787.

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