کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4415746 1307757 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photolysis of nonylphenol ethoxylates: The determination of the degradation kinetics and the intermediate products
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Photolysis of nonylphenol ethoxylates: The determination of the degradation kinetics and the intermediate products
چکیده انگلیسی

The photolysis of nonylphenol ethoxylates with an average oligomers length of ten ethoxylate units (NPEO10) in aqueous solution under UV, as well as the influence of humic acid (HA) on the photolysis was studied. A 125 W high-pressure mercury lamp was employed as the light source. The intermediate products from the photolysis were determined by LC-MS. The results indicated that NPEO10 underwent direct photolysis upon exposed to UV. The degradation pathway was complex. Besides the generally proposed degradation pathway of ethylene oxide (EO) side chains shortening, the oxidation of alkyl chain and EO chain led to intermediates having both a carboxylated (as well as carbonylated) ethoxylate and alkyl chain of varying lengths. The hydrogenation of benzene ring was also detected. The kinetics data showed that the first order reaction kinetics could be well used to describe the kinetics of NPEO10 degradation. In the presence of dissolved organic matter by HA addition, the performance of NPEO10 photodegradation was reduced. The photolysis rate decreased with increased HA concentration.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 68, Issue 2, June 2007, Pages 354–359
نویسندگان
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