Decomposition of Ethylenediaminetetraacetic Acid Using He‐Ar‐O₂ Dielectric Barrier Discharge

Abstract

Summary: DBD generated by mid‐frequency AC (30 kHz) at atmospheric pressure was used for the degradation of EDTA in aqueous solution. The concentration of EDTA was measured by HPLC and TOC analysis. More than 90% of EDTA (initial concentration of 0.2 wt.‐%) was decomposed by DBD degradation, and the TOC content was reduced to below 60% of the initial value within one hour. The reaction was faster at high plasma generation voltages. At an applied voltage of 14 kV, 50% of EDTA was degraded by DBD degradation in only 10 min.

Novel Cu(II)–EDTA Decomplexation by Discharge Plasma Oxidation and Coupled Cu Removal by Alkaline Precipitation: Underneath Mechanisms

“…Excess EDTA dosage would result in the presence of free EDTA molecules in the solutions. It was reported that EDTA could be efficiently decomposed by electrical discharge plasma . Thus, the free EDTA molecules could compete with Cu–EDTA for the produced reactive species, and thus depressed Cu–EDTA decomplexation.…”

“…It was reported that EDTA could be efficiently decomposed by electrical discharge plasma. 13 Thus, the free EDTA molecules could compete with Cu−EDTA for the produced reactive species, and thus depressed Cu−EDTA decomplexation. Previous researches reported that Cu− peroxide could be generated via reaction of H 2 O 2 and Cu 2+ , leading to enhanced generation of •OH radicals, as shown in Reactions 1 and 2, which then promoted organic pollutant degradation.…”

“…13−18 Previous works indicated that organic chelating agents such as EDTA could be efficiently decomposed by discharge plasma. 13 It was reported discharge plasma could achieve simultaneous dyes degradation and Cr 6+ conversion in a solution where the dyes and Cr 6+ coexisted without complexation between them. 15,16 It was worth noting that (CH 3 COO) 2 Pb, which was a noncomplex and simple compound, was destructed by discharge plasma and then Pb 2+ was released, which was advantageous for the removal of Pb 2+ by traditional chemical precipitation.…”

“…Simultaneously, several physical actions including UV radiation, shock waves, and cavitation effects would also generate in the electrical discharge plasma process. Under the synergistic effects of these active species and physical actions, chemical bonds of the organic compounds would be ruptured or valence state of the heavy metal ions would be changed. − Previous works indicated that organic chelating agents such as EDTA could be efficiently decomposed by discharge plasma . It was reported discharge plasma could achieve simultaneous dyes degradation and Cr 6+ conversion in a solution where the dyes and Cr 6+ coexisted without complexation between them. , It was worth noting that (CH 3 COO) 2 Pb, which was a noncomplex and simple compound, was destructed by discharge plasma and then Pb 2+ was released, which was advantageous for the removal of Pb 2+ by traditional chemical precipitation .…”

Degradation of Aniline Wastewater Using Dielectric Barrier Discharges at Atmospheric Pressure

“…The species •OH, •H, •O 2 H and O 3 exhibit a strong oxidizing ability, which enables them to participate in the contaminant decomposition processes. NTP processes can rapidly and efficiently degrade various organic compounds, including 2,4-dinitrophenol [9] , phenol and its derivatives [10,11] , acetophenone [12] , ethylenediaminetetraacetic acid [13] , and organic dyes [14,15] . DBD is considered an effective discharge source for generating NTP because of its advantages of easy operation, stable and micro-discharge, as well as large treatment area.…”