Degradation d’un polluant organique (herbicide) photocatalysee par des materiaux inorganiques vierges et dopes par la lumiere artificielle et solaire en solution aqueuse

الموضوعات

علوم بحتة وطبيعية

روابط وملفات

التعريف والنوع

رقم الوثيقة

ecbb4015-4d40-48d0-90fc-3fc6ab0a2bf6

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

790921_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":" Hind Mechakra","title_ar":"اعداد","title_en":"Preparation"},{"name_ar":"Sehili Tahar","title_ar":"اشراف","title_en":"Supervision"}]

اللغة

French

المصدر والدورية

اسم المصدر

Degradation d’un polluant organique (herbicide) photocatalysee par des materiaux inorganiques vierges et dopes par la lumiere artificielle et solaire en solution aqueuse

المحتوى والصفحات

عدد الصفحات

0

ترجمة الملخص

This doctoral work focused on the study of the elimination of an herbicide, the linuron, inaqueous phase, using various degradation processes especially iron oxides. The aim is toapply these methods for the depollution of aqueous effluents related to the fabrication and the use of pesticides. Analytical tools for the mineralization decomposition kinetics and theidentification of by-products of degradation have been used. Hydrogen peroxide andcarboxylic acids addition significantly improves the degradation and mineralization due to the production of strong oxidizing radicals. Moreover, the implication of radical species has been demonstrated in the studied systems as evidenced by the addition of radical inhibitor(isopropanol). In the first part, the degradation of linuron was carried out in a homogeneousmedium. The speed degradation constants were determined for the different processes (UV,H2O2 / UV, H2O2 / Fe2+ / UV). In the second part, the heterogeneous systems using a naturaliron oxide were studied. The main photoproducts were identified by UHPLC / MS and theirkinetics were drawn. Mineralization has been followed and degradation mechanisms havebeen proposed. These mechanisms primarily involve (i) the hydroxylation of the aromatic ring with or without simultaneous dechlorination, (ii) the N-demethylation of N-methylurea and (iii) the N-demethoxylation of substituted-N-methoxyurea. Finally, linuron degradation by natural iron oxide (NIO) was compared with the photocatalytic system involving a labsynthesized nanoscale iron oxide (NPs). It appeared that the degradation in NIO H2O2/ UV and NPs/ H2O2/ UV systems is effective in acid while the pH does not play an important role in NIO/ UV and NPs/ UV system.

إشراف وإعداد

الإشراف

Sehili Tahar

الإعداد

Hind Mechakra

الاقتباسات الببليوغرافية