کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
584842 877899 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
UV light induced photodegradation of malachite green on TiO2 nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
UV light induced photodegradation of malachite green on TiO2 nanoparticles
چکیده انگلیسی
The photodegradation of malachite green (MG), a cationic triphenylmethane dye, is examined both under different pH values and amounts of TiO2. After 15 W UV-365 nm irradiation for 4 h, ca. 99.9% of MG was degraded with addition of 0.5 g L−1 TiO2 to solutions containing 50 mg L−1 of the MG dye. The HPLC-PDA-ESI-MS technique was used to obtain a better understanding on the mechanistic details of this TiO2-assisted photodegradation of the MG dye with UV irradiation. Five intermediates of the process were separated, identified, and characterized for the first time. The results indicated that the N-de-methylation degradation of MG dye took place in a stepwise manner to yield mono-, di-, tri-, and tetra-N-de-methylated MG species generated during the processes. Under acidic conditions, the results indicated that the photodegradation mechanism is favorable to cleavage of the whole conjugated chromophore structure of the MG dye. Under basic conditions, the results showed that the photodegradation mechanism is favorable to a formation of a series of N-de-methylated intermediates of the MG dye.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 141, Issue 3, 22 March 2007, Pages 520-528
نویسندگان
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