کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8091039 | 1521989 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photodegradation in natural waters of nitrosamines and nitramines derived from CO2 capture plant operation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Photodegradation in natural waters of nitrosamines and nitramines derived from CO2 capture plant operation Photodegradation in natural waters of nitrosamines and nitramines derived from CO2 capture plant operation](/preview/png/8091039.png)
چکیده انگلیسی
Amine solvents used in post combustion CO2 capture (PCCC) plants react with NOx, forming carcinogenic nitrosamine and nitramine compounds. These can be emitted to the atmosphere, undergoing deposition to aquatic and terrestrial environments. In the current study, the hydrolytic and photolytic degradation of nine nitramines and nitrosamines identified as possible degradation products of 2-monoethanolamine and piperazine solvents are studied. Nitrosamines and nitramines are generally resistant to hydrolysis, although nitrosopiperazine and piperazine nitramine both undergo up to 50% degradation at 50 °C and pH 7, but not at lower temperatures or other pH values. Owing to absorbance at â¼340 nm, the nitrosamines degrade rapidly in aqueous solution when exposed to sunlight (half-lives in the range 6-11 min), whilst nitramines are photolytically stable. Light screening by natural organic matter (1-100 mg/L) lead to an â¼3-fold decrease in nitrosodiethanolamine (NDELA; 1 mg/L) degradation rate. A theoretical study indicates environmentally relevant concentrations of NDELA may be persistent due to competition with NOM for photons. The main photodegradation products are identified for each nitrosamine, and degradation mechanisms suggested.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Greenhouse Gas Control - Volume 32, January 2015, Pages 106-114
Journal: International Journal of Greenhouse Gas Control - Volume 32, January 2015, Pages 106-114
نویسندگان
Lisbet Sørensen, Kolbjørn Zahlsen, Astrid Hyldbakk, Eirik Falck da Silva, Andy M. Booth,