Electrochemical organic destruction in support of Hanford tank waste pretreatment

Lawrence, W.E.; Surma, J.E.; Gervais, K.L.; Buehler, M.F.; Pillay, G.; Schmidt, A.J.

doi:10.2172/10193979

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“…The oxalate thus formed is oxidized to CO2 17 as follows 00 0-C-C-0 -2C02 + 2e [9] (Oxalate) Pt CH2OHO -611O110(ads) + H(ads) [13] moderate + HCHO [2] . slow CHOHO(ads) + OW -HCHOO + H20 + e [14] 00CC112 CH2COO fast H(ads) + OW -H0 + e [15] The number of electrons participating in the initial EDTA oxidation reaction was determined by electrolyzing EDTA solution under constant current conditions and Formate is generally less electroactive than other organic species and can be expected to be oxidized to CO2 according to the reaction18 measuring the CO2 content in the alkaline solution using TIC analysis. According to Eq.…”

Section: Resultsmentioning

confidence: 99%

Anodic Oxidation of Ethylenediaminetetraacetic Acid on Platinum Electrode in Alkaline Medium

Pakalapati

Popov

White

1996

J. Electrochem. Soc.

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The anodic oxidation of ethylenediaminetetraacetic acid (EDTA) was studied in alkaline medium on a smooth platinum electrode. Bulk electrolysis indicated that stable organic intermediates (formaldehyde and glyoxal) are formed during the oxidation of EDTA and that complete oxidation to CO2 can be achieved. The proposed pathway suggests that the acetate groups in EDTA are initially oxidized, generating formaldehyde and ethylenediamine. The rest potential of EDTA (0.066to 0.164 V vs. Hg/HgO) was observed to be higher than for other organic species. In alkaline medium, very little EDTA oxidation was found to occur on bare platinum. Limiting-current behavior due to PtO formation was observed immediately positive of the rest potential. Tafel behavior (Tafel slope 120 mV/dee) was observed in the potential region positive of the cessation of the bulk of oxide film formation and negative of the onset of °2evolution. The reaction order of EDTA was determined to be -0.5, and that of OW was close to zero. The reaction mechanism consistent with the experimental data involves Temkin-type adsorption and a first-electron-transfer rate-determining step.

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