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Kinetics of Ozonation of Typical Sulfonamides in Water.pdf
BiomedEnvironSci,2011;24(3):255—260 255
OriginalArticle
KineticsofOzonationofTypicalSulfonamidesinWater*
SUIM ingHao ,XINGSiChu ,ZHUChunYan,SHENG Li,LU KeXiang,andGAONaiYun
,.StateKeyLaboratory ofPollution ControlandResourceReuse,SchooloJE‘nvironmentalScienceand
Engineering,ron~iUniversity,Shanghai200092China,2.SchoolofMechanicalandInstrumentalEngineering,
Xi’anUniversityofTechnology,Xi’an71004Shanxi,China
Abstract
Objective Toinvestigatethekineticrateconstantsozoneandhydroxylradicalstowardstwogroupsof
antimicrobials--sulfadiazine(SD)andsulfamethoxazole(SMX).
M ethods Thesoluteconsumptionmethodwasusedtodetecttherateconstantsofozonealonewith
sulfadiazineandsulfamethoxazole,andtertiarybutano1wasselectedasascavengingagentandpHwas
adjustedto2.5byaddingorthophosphatebuffers(0B)jandthecompetitionkineticsstudying
methodwithnitrobenzeneasareferencewasappliedtomeasuretherateconstantsofhydroxvIradicaIs
towardssuIfadiazineandsulfamethoxazole,andpHwasadiustedto7.0byadding0B.
Results TherateconstantsofSDandSMXwithozonealonewere261mol~ ·dm ·s一and303otol一 ·
dm3 ·s bycalcuIatinginIow reactionsystem .TherateconstantsofhydroxyIradicalswithSDandSMX
were2.2x1010mol~ ·dm ·s~and2.7×1010mol一-dm。·s~,respectively.Moreover,therateconstants
ofhydroxyIradicaIswithSMXwerefoundtohaveincreasedfr0m 3.6×109mol一 ·dm ·s一to2.8×1010
mol~·dm ·s。withpHvaluerisingfrOm 5.0to7.8.
Conclusion SMXandSDarebothrefractorytoozoneoxidationalone,andareliabletobedegradedby
hydroxylradicals,andtherateconstantsofSMXwiththehydroxylradicalslightlyincreaseswithpHrise.
Key words:Antibiotics;Sulfadiazine;Sulfamethoxazole;Kinetics;Rate constant;Ozone;Hydroxyl
radicals
BiomedEnvironSci,2011;24(3):255—260 doi:lO.3967/0895—3988
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