Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/45448
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dc.contributor.authorLiang, C.J.en_US
dc.contributor.author梁振儒zh_TW
dc.contributor.authorHuang, C.F.en_US
dc.contributor.authorChen, Y.J.en_US
dc.date2008zh_TW
dc.date.accessioned2014-06-06T08:15:05Z-
dc.date.available2014-06-06T08:15:05Z-
dc.identifier.issn0043-1354zh_TW
dc.identifier.urihttp://hdl.handle.net/11455/45448-
dc.description.abstractThe present study focused on evaluation of activated persulfate (PS) anion (S2O82-) oxidative degradation of benzene, toluene, ethylbenzene, and xylene (constituents of gasoline and known collectively as BTEX) contamination. The results indicated that BTEX were effectively oxidized by PS in aqueous and soil slurry systems at 20 degrees C. PS can be activated thermally, or chemically activated with Fe2+ to form the sulfate radical (SO(4)radical anion) with a redox potential of 2.4V. The degradation rate constants of BTEX were found to increase with increased persulfate concentrations. For two PS/BTEX molar ratios of 20/1 and 100/1 experiments, the observed aqueous phase BTEX degradation half-lives ranged from 3.0 to 23.1 days and 1.5 to 20.3 days in aqueous and soil slurry systems, respectively. In the interest of accelerating contaminant degradation, Fe and chelated Fe2+ activated persulfate oxidations were investigated. For all iron activation experiments, BTEX and persulfate degradations appear to occur almost instantaneously and result in partial BTEX removals. It is speculated that the incomplete degradation reaction may be due to the cannibalization of SO(4)radical anion in the presence of excess Fe2+. Furthermore, the effects of various chelating agents including, hydroxylpropyl-beta-cyclodextrin (HPCD), ethylenediaminetetraacetic acid (EDTA), and citric acid (CA) on maintaining available Fe2+ and activating PS for the degradation of benzene were studied. The results indicated that HPCD and EDTA may be less susceptible to chelated Fe2+. In contrast, CA is a more suitable chelating agent in the iron activated persulfate system and with a PS/CA/Fe2+/B molar ratio of 20/5/5/1 benzene can be completely degraded within a 70-min period. (C) 2008 Elsevier Ltd. All rights reserved.en_US
dc.language.isoen_USzh_TW
dc.relationWater Researchen_US
dc.relation.ispartofseriesWater Research, Volume 42, Issue 15, Page(s) 4091-4100.en_US
dc.relation.urihttp://dx.doi.org/10.1016/j.watres.2008.06.022en_US
dc.subjectIn situ chemical oxidationen_US
dc.subjectSulfate radicalen_US
dc.subjectGasoline hydrocarbonsen_US
dc.subjectCitric aciden_US
dc.subjectActivationen_US
dc.subjectin-situ remediationen_US
dc.subjectferrous ionen_US
dc.subjectoxidationen_US
dc.subjecttceen_US
dc.subjecttrichloroethyleneen_US
dc.subjectperoxydisulfateen_US
dc.subjectcomplexationen_US
dc.subjectkineticsen_US
dc.subjectironen_US
dc.titlePotential for activated persulfate degradation of BTEX contaminationen_US
dc.typeJournal Articlezh_TW
dc.identifier.doi10.1016/j.watres.2008.06.022zh_TW
item.languageiso639-1en_US-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
item.openairetypeJournal Article-
item.fulltextno fulltext-
item.grantfulltextnone-
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