کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4411304 1307588 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of oxygen on chemical dechlorination of dieldrin using iron sulphides
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
The effect of oxygen on chemical dechlorination of dieldrin using iron sulphides
چکیده انگلیسی

The degradation of dieldrin by ferric sulphide (FeS2) in aqueous solution was investigated when shielded against sunlight. An oxidative dechlorination process was observed under aerobic and anaerobic conditions; oxygen volume changed the degradation rate of dieldrin and the generation rate of reaction products. The dechlorination rate under microaerophilic conditions was fastest among the anaerobic to air oxygen concentrations. For this experiment, over 99% of the dieldrin was degraded, and 90% of the released chloride was detected after 30 d under 10 μmol oxygen. The major reaction products were different depending on the dose of oxygen. In the case of aerobic conditions, low molecular weight organic acids, such as formic acid, lactic acid, and oxalic acid, were generated as major reaction products. However, under anaerobic conditions, C16H22O4 (dibutyl phthalate) and C6H13ClO (3-chloro-4-methyl-2-pentanol) were detected as reaction intermediates, and small amounts of succinic acid, malonic acid, and formic acid were also generated. These reactions proceed by FeS2 interface reactions with H2O under anaerobic condition, or O2 under aerobic condition.

Research highlights
► The degradation of dieldrin by ferric sulphide in aqueous solution was observed.
► Oxygen effect on the degradation rate and the generation of reaction products.
► Low molecular weight organic acids were mainly generated under aerobic condition.
► Reaction intermediates were accumulated under low O2 condition.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 82, Issue 9, February 2011, Pages 1308–1313
نویسندگان
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