کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
56488 47084 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photocatalytic removal of s-triazines: Evaluation of operational parameters
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Photocatalytic removal of s-triazines: Evaluation of operational parameters
چکیده انگلیسی

The photocatalytic degradation of atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) and simazine (2-chloro-4,6-diethylamino-1,3,5-triazine) herbicides widely used in agriculture has been investigated. Experimental design methodology was used to assess the influence of pH and TiO2 concentration and the efficiency of the process. The results indicated that in the experimental domain investigated TiO2 concentration was the most significant factor in contrast to the scarce influence shown by the initial pH. The mechanism of atrazine and simazine photocatalytic degradation was studied under the experimental conditions determined as optimal. No full mineralization of atrazine or simazine was achieved. The main intermediates occurring during the reaction were identified by high performance liquid chromatography (HPLC). Based on the concentration profile of intermediates formed during the treatment a degradation pathway is proposed for each herbicide. The toxicity along the reaction was monitored by means of luminescence bioassays using Vibrio fischeri. The inhibition percentage decreases with the irradiation times what can be associated with the formation of highly hydroxylated intermediates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 161, Issue 1, 17 March 2011, Pages 153–162
نویسندگان
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