Comportements Thermique Et Photochimique Du Paracétamol Et De L’aspirine Par La Goethite en Solution Aqueuse en Phase Hétérogène

الموضوعات

علوم بحتة وطبيعية

الملخص

The photodegradation of two pharmaceuticals (PP), paracetamol (PC) and aspirin (ASP), inducedby an iron (III) oxyhydroxide (Goethite) was studied in aqueous solution in heterogeneous phase.The phototransformation of the substrates was followed by spectrophotometry and HPLC invarious mixtures namely: PP-Goethite, PP-Goethite-H2O2 and PP-Goethite-carboxylic acid.In absence of light both substrates showed different behavior with regard to Goethite in aqueoussolution. Indeed, no interaction was observed in the case of the PC whereas a particular reactionwas highlighted in the case of the ASP.Under irradiation, photodegradation of PP induced by Goethite shows slow kinetics and isdependent on several parameters such as pH, substrate concentration and catalyst. Fe (II) formedexclusively in the ASP-Goethite mixture shows the photocatalytic dissolution of Goethite.The mechanistic study reveals that hydroxyl radicals are not involved in the photocatalytic processof PC, however they govern on the photodegradation mechanism of ASP.The addition of hydrogen peroxide in the PP-Goethite mixture improves significantly the rate ofdisappearance of the substrates following a large production of ●OH radicals generated by aheterogeneous photo Fenton reaction. Different parameters have been studied, the effect of pH, aswell as the concentration of H2O2.The addition of carboxylic acid to the PP-Goethite system has also been studied and shows thatoxalic acid has the most important photoactivity following the involvement of the heterogeneouslike-Fenton process resulting from the photoreductive dissolution of the complex surface formedbetween Fe (III) of Goethite and oxalic acid.The following of the mineralization shows that the life of intermediates reaction is much greaterthan the starting product.In order to verify the feasibility of the photochemical process in the environment, the same systemswere studied under solar irradiation. The results show that such systems operate with kinetics ofthe same order as those observed in artificial irradiations. These results provide some knowledgeabout the fate of PP in the aquatic environment as well as the photocatalytic treatment with oxy(hydroxides) of Fe (III). These results are very promising for the application of this system underpH conditions close to those met in the environment.

روابط وملفات

التعريف والنوع

رقم الوثيقة

f39a96fc-b9dc-445b-ba0b-e3535120a18e

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

790804_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":" Nadra Debbache","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":" Yazid Mameri","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

French

المصدر والدورية

اسم المصدر

Comportements Thermique Et Photochimique Du Paracétamol Et De L’aspirine Par La Goethite en Solution Aqueuse en Phase Hétérogène

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

Nadra Debbache

الإعداد

Yazid Mameri

الاقتباسات الببليوغرافية