Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 319, Issue -, Pages 130-136Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.12.020
Keywords
Ferrate; Sponge iron; Oxidation; Coagulation; Removal
Categories
Funding
- Jilin Provincial Science & Technology Department [20130413046GH]
- Science and Technology Department of Jilin City [2015334006]
- Education Department of Jilin Province [2014105]
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Ferrate(VI) ((FeO42-)-O-VI, Fe(VI)) is a greener oxidant in the treatment of drinking water and wastewater. The electrochemical synthesis of Fe(VI) may be considered environmentally friendly because it involves one-step process to convert Fe(0) to Fe(VI) without using harmful chemicals. Electrolysis was performed by using a sponge iron as an anode in NaOH solution at different ionic strengths. The cyclic voltammetric (CV) curves showed that the sponge iron had higher electrical activity than the grey cast iron. The optimum current density was 0.054 mA cm(-2) in 10 M NaOH solution, which is much lower than the electrolyte concentrations used in other electrode materials. A comparison of current efficiency and energy consumption was conducted and is briefly discussed. The generated ferrate solution was applied to degrade phenol in water at two levels (2 mg L-1 and 5 mg L-1). The maximum removal efficiency was similar to 70% and the optimum pH for phenol treatment was 9.0. Experiments on phenol removal using conventional coagulants (ferric chloride (FeCl3) and polyaluminium chloride (PAC)) were performed independently to demonstrate that removal of phenol by Fe(VI) occurred mainly by oxidative transformation. A combination of Fe(VI) and coagulant may be advantageous in enhancing removal efficiency, adjusting pH, and facilitating flocculation. (C) 2015 Elsevier B.V. All rights reserved.
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