Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
576234 | Journal of Hazardous Materials | 2015 | 8 Pages |
Abstract
The application of calcium peroxide (CaO2) activated with ferrous ion to stimulate the degradation of trichloroethylene (TCE) was investigated. The experimental results showed that TCE could be completely degraded in 5Â min at a CaO2/Fe(II)/TCE molar ratio of 4/8/1. Probe compound tests demonstrated the presence of reactive oxygen species HO and O2â in CaO2/Fe(II) system, while scavenging tests indicated that HO was the dominant active species responsible for TCE removal, and O2â could promote TCE degradation in CaO2/Fe(II) system. In addition, the influences of initial solution pH and solution matrix were evaluated. It suggested that the elevation of initial solution pH suppressed TCE degradation. Clâ had significant scavenging effect on TCE removal, whereas HCO3â of high concentration showed favorable function. The influences of NO3â and SO42â could be negligible, while natural organic matter (NOM) had a negative effect on TCE removal at a relatively high concentration. The results demonstrated that the technique of CaO2 activated with ferrous ion is a highly promising technique in in situ chemical oxidation (ISCO) remediation in TCE contaminated sites.
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Authors
Xiang Zhang, Xiaogang Gu, Shuguang Lu, Zhouwei Miao, Minhui Xu, Xiaori Fu, Zhaofu Qiu, Qian Sui,