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| Decontamination of Pentachlorophenol Using Solid Fenton-like Reagents |
| Received:July 10, 2015 |
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| KeyWord:pentachlorophenol;chemical degradation;solid peroxide;iron mineral;Fenton reaction |
| Author Name | Affiliation | E-mail | | YANG Bing | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Department of Environmental Sciences, The Connecticut Agricultural Experiment Station, 123 Huntington Street, New Haven, Connecticut 06504-1106, United States | | | Pignatello Joseph J | Department of Environmental Sciences, The Connecticut Agricultural Experiment Station, 123 Huntington Street, New Haven, Connecticut 06504-1106, United States | | | QU Dong | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | dongqu@nwafu.edu.cn |
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| Abstract: |
| In this study, four types of solid peroxides(calcium peroxide, CP;sodium perborate, SPB;sodium percarbonate, SPC;urea hydrogen peroxide, UHP), H2O2, and two iron sources[Fe3(PO4)2 and FeSO4] were used to investigate pentachlorophenol(PCP) degradation in silica sand slurries by Fenton-like reactions in incubation experiment. The main factors influencing the effectiveness and sustainability of active components of Fenton-like reagents were explored. Adding CP, SPB or SPC quickly increased solution pH to 10~12 and significantly inhibited Fe(Ⅱ) effectiveness. However, H2O2 or UHP showed little effect on solution pH. The rate of PCP degradation was 22.0%, 14.6%, 17.3%, 86.5% and 83.8%, respectively, for CP, SPB, SPC, UHP and H2O2 with FeSO4 as Fe(Ⅱ) source in 24 hours, and no obvious further PCP degradation was observed from 24 to 48 hours. For treatments with Fe3(PO4)2 as a steady Fe(Ⅱ) source, however, PCP showed continuous degradation during 20 d experimental period. The PCP degradation rate on the 20th day was 30.1%, 13.6%, 8.6% and 37.0%, for CP, SPB, SPC and UHP, respectively. Applying H2O2 resulted in 55.6% degradation of PCP in 16 days in Fe3(PO4)2 Fenton reaction. The present results show that pH buffer is required for a better decontamination performance when using alkaline-inducing solid peroxides(CP, SPB and SPC) as Fenton-like reagents. UHP might be an alternative for H2O2. Solid Fenton-like reagents significantly extend active components′ life time from less than 24 hours to more than 20 days, thus possessing greater potential for soil contamination remediation. |
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