Abstract
A novel Pt/ACF (Pt supported on activated carbon fibers) electrode was successfully prepared with impregnation and electrodeposition method. Characterization of the electrodes indicated that the Pt/ACF electrode had a larger effective area and more active sites. Electrochemical degradation of ethylenediaminetetra-acetic acid (EDTA) in aqueous solution with Pt/ACF electrodes was investigated. The results showed that the 3% Pt/ACF electrode had a better effect on EDTA removal. The operational parameters influencing the electrochemical degradation of EDTA with 3% Pt/ACF electrode were optimized and the optimal removal of EDTA and chemical oxygen demand (COD) were 94% and 60% after 100 min on condition of the electrolyte concentration, initial concentration of EDTA, current density and initial value of pH were 0.1 mol/L, 300 mg/L, 40 mA/cm2 and 5.0, respectively. The degradation intermediates of EDTA in electrochemical oxidation with 3% Pt/ACF electrode were identified by gas chromatography-mass spectrum (GC-MS).
Highlights
The main purpose for considering the use of the decontamination techniques in the nuclear installation out of commission is removing the contamination from equipment and to reduce dose levels
There is a sharp decrease in CO uptake with an increase of Platinum sheet (Pt) loading from 3 to 5%, implying that more active sites are present on 3% Pt/Activated carbon fibers (ACF)
The electrochemical degradation of Ethylenediaminetetra-acetic acid (EDTA) over Pt/ACF electrodes was investigated in this study
Summary
The main purpose for considering the use of the decontamination techniques in the nuclear installation out of commission is removing the contamination from equipment and to reduce dose levels. Ethylenediaminetetra-acetic acid (EDTA) is an efficient chelating agent widely used in industrial, agricultural and pharmaceutical applications, among others. It is an important decontaminating agent in the nuclear industry. The presence of EDTA in radioactive liquid waste made it difficult to treat because: (1) EDTA of ionic state will form to complex with radioactive nuclide and this made it difficult to be separated. (2) The existence of EDTA in the radioactive wastewater reduced chemisorption of radioactive nuclide and accelerated its migration rate in ground water, soil and surface water [1]. The conventional methods to treat EDTA in radioactive wastewater such as incineration, pyrolysis, Fenton oxidation, wet oxidation [3], ultraviolet light and ozone oxidation [4], are low efficiency and require complicated devices. Electrochemical oxidation systems have been proven to be very effective to treat a variety of organic wastewaters [5,6,7]
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