Distinct Effects of Reduced Sulfur Compounds on Pd-catalytic Hydrodechlorination of TCE in Groundwater Using Cathodic H2 under Electrochemically-induced Oxidizing Conditions Page: 4 of 46
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1 ABSTRACT Pd-catalytic hydrodechlorination of trichloroethylene (TCE) in
2 groundwater using electro-generated H2 is investigated under electrochemically-
3 induced oxidizing condition. In particular, the distinct effects of sulfide and sulfite are
4 elucidated. In an undivided electrolytic cell, TCE is hydrodechlorinated to ethane by
5 Pd and cathodic H2 even though anodic 02 is proportionally generated. In a typical
6 treatment at pH 4, TCE (26.1 mg/L) is hydrodechlorinated, in a pseudo-zero-order
7 kinetics, by 67.7% within 80 min with the accumulation of 19.2 mg/L H202. Sulfide
8 shows moderate inhibition on both TCE hydrodechlorination and H202 accumulation
9 by foiling Pd catalyst. Different from the influence under anaerobic condition, sulfite
10 at low concentrations (< 1 mM) significantly enhances TCE decay, and at high
11 concentration (3 mM) inhibits initially and enhances afterwards when sulfite
12 concentration declines to less than 1 mM. Sulfite is oxidized by chemisorbed H202
13 and -OH forming S03- and SOs5- radicals, which contributes to TCE decay through
14 oxidation in parallel to Pd-catalytic hydrodechlorination. Using a specially configured
15 three-electrode column, acidic and oxidizing conditions are automatically developed
16 in the Pd zone, wherein TCE is greatly hydrodechlorinated with certain resistance to
17 RSC foiling.
20 Contamination of groundwater by chlorinated hydrocarbon compounds (CHCs),
21 such as trichloroethylene (TCE) and perchloroethylene (PCE), continues to be a
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Yuan, S; Chen, M; Mao, X & Alshawabkeh, A N. Distinct Effects of Reduced Sulfur Compounds on Pd-catalytic Hydrodechlorination of TCE in Groundwater Using Cathodic H2 under Electrochemically-induced Oxidizing Conditions, article, June 27, 2012; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc869791/m1/4/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.