Journal
RSC ADVANCES
Volume 5, Issue 75, Pages 60849-60856Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra07655b
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Funding
- National Natural Science Foundation of China [41373094, 51208199]
- China Postdoctoral Science Foundation [2015M570341]
- Fundamental Research Funds for the Central Universities [22A201514057]
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In this study, the degradation performance of 1,1,1-trichloroethane (TCA) involving both oxidation and reduction processes was investigated with an application of the persulfate-ZVI (zero-valent iron) system, in which it is generally believed that SO4-center dot-induced oxidation was responsible for pollutant removal. The study was conducted with persulfate and un-pretreated ZVI through batch experiments. The results showed that TCA was stable in the presence of ZVI alone within 12 h and degraded with the addition of persulfate. TCA degradation efficiency was found to increase with increasing persulfate concentration, but to decrease with increasing ZVI dosage. A two-stage process involving persulfate oxidation and ZVI reduction was developed during TCA degradation. The addition of isopropanol and tert-butyl alcohol proved the existence of sulfate and hydroxyl radicals during the 1st-stage (0-2 h), which were absent in the 2nd-stage (2-12 h) when persulfate was exhausted. The degradation performance of carbon tetrachloride, a reduction probe compound, was evidence of the persulfate-ZVI system involving an enhanced ZVI reduction, and which was mainly responsible for TCA degradation in the 2nd-stage. 1,1-Dichloroethane was the only confirmed intermediate emerging during the 2nd-stage.
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