US EPA

1322267 

Journal Article 

Effects of nitrate on the advanced UV photolysis of di(2-ethylhexyl) phthalate degradation in aqueous solution 

Park, CG; Kim, JC 

2012 

Yes 

Desalination and Water Treatment
ISSN: 1944-3994
EISSN: 1944-3986 

DESALINATION PUBL 

HOPKINTON 

47 

1-3 

163-170 

English 

10.1080/19443994.2012.696811 

WOS:000308996900021 

https://search.proquest.com/docview/1778061512?accountid=171501
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One of the objectives of this study was to delineate the
effect of nitrate on the oxidation of di (2-ethylhexyl) phthalate (DEHP) by conducting bench-
scale UV/H2O2 operations under a variety of UV doses and initial concentrations of H2O2 and NO3
--N. Also, this study evaluated the two processes, UV alone and UV/H2O2, for DEHP oxidation. DEHP
separation and quantification were performed using liquid chromatography-electrospray ionization
tandem mass spectrometry system (LC-ESI-MS/MS). It was found that the UV photolysis of H2O2 is a
more effective method of DEHP oxidation than the direct UV photolysis. It was observed that the
DEHP oxidation efficiency of about 85.0% or higher could be achieved at a UV dose of 800 mJ/cm(2)
with an initial H2O2 concentration of more than 30mg/L in the absence of nitrate. Nitrate
hindered the DEHP oxidation by acting as (OH)-O-center dot scavengers. The adverse effect by
nitrate in the UV/H2O2 process was significantly greater than that in the UV oxidation-alone, and
its oxidation was almost reduced to half by nitrate under some operating condition. However, it
is noted that the DEHP oxidation efficiency of more than 70% could be expected at a UV dose of
600 mJ/cm(2) with an initial H2O2 concentration of 50mg/L while considering the nitrate
scavenging effect. 

DEHP; Hydroxyl radical; Nitrate; Scavenger; UV/H2O2