Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/45422
DC FieldValueLanguage
dc.contributor.authorLiang, C.J.en_US
dc.contributor.author梁振儒zh_TW
dc.contributor.authorSu, H.W.en_US
dc.date2009zh_TW
dc.date.accessioned2014-06-06T08:15:03Z-
dc.date.available2014-06-06T08:15:03Z-
dc.identifier.issn0888-5885zh_TW
dc.identifier.urihttp://hdl.handle.net/11455/45422-
dc.description.abstractThermal activation can induce persulfate (S(2)O(8)(2-)) degradation to form sulfate radicals (SO(4)(-)center dot) that can undergo radical interconversion to form hydroxyl radicals (HO center dot) under alkaline conditions. The radicals SO(4)(-)center dot/HO center dot can be present either individually or simultaneously in the persulfate oxidation system. To identify the active radical species, a chemical probe method was developed. An excess of probe compounds was added to the system, and differences between the reactivity of the probes and the potential radical species were observed. The usage of various probes, including tert-butyl alcohol, phenol, and nitrobenzene (NB), for simultaneously identifying SO(4)(-)center dot/HO center dot was investigated. NB can only react with radicals: it cannot react with persulfate. The reaction rate of NB with HO center dot is 3000-3900 times greater than that of NB with SO(4)(-)center dot, which is a good candidate for use as a probe for differentiating between SO(4)(-)center dot/HO center dot reactivity. Furthermore, the effects of pH on the formation Of SO(4)(-)center dot/HO center dot were demonstrated by the degradation kinetics of NB at varying pH values. The results indicated that SO(4)(-)center dot is the predominant radical at pH <7; both SO(4)(-)center dot and HO center dot are present at pH 9; HO center dot is the predominant radical at a more basic pH (i.e., pH 12). The use of chemical probe NB is a suitable compound for differentiating HO center dot/SO(4)(-)center dot reactivity.en_US
dc.language.isoen_USzh_TW
dc.relationIndustrial & Engineering Chemistry Researchen_US
dc.relation.ispartofseriesIndustrial & Engineering Chemistry Research, Volume 48, Issue 11, Page(s) 5558-5562.en_US
dc.relation.urihttp://dx.doi.org/10.1021/ie9002848en_US
dc.subjectelectron-spin-resonanceen_US
dc.subjectrate constantsen_US
dc.subjectaqueous-solutionen_US
dc.subjectorganic-compoundsen_US
dc.subjectpulse-radiolysisen_US
dc.subjectchloride-ionsen_US
dc.subjectoxidationen_US
dc.subjectmechanismen_US
dc.subjectkineticsen_US
dc.subjectso4en_US
dc.titleIdentification of Sulfate and Hydroxyl Radicals in Thermally Activated Persulfateen_US
dc.typeJournal Articlezh_TW
dc.identifier.doi10.1021/ie9002848zh_TW
item.openairetypeJournal Article-
item.fulltextno fulltext-
item.cerifentitytypePublications-
item.grantfulltextnone-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.languageiso639-1en_US-
Appears in Collections:環境工程學系所
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