کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
626230 882867 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Application of ozone on the decolorization of reactive dyes — Orange-13 and Blue-19
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Application of ozone on the decolorization of reactive dyes — Orange-13 and Blue-19
چکیده انگلیسی

This study investigated the feasibility of applying ozone (O3) to reduce the color content of wastewater caused by two commercial reactive dyes (Blue-19 and Orange-13). In the bench-scale experiment, experimental parameters including pH, ozone dosage, and reaction time were evaluated in a 14-L reactor to obtain the optimal operating conditions. Results show that ozone dosage and pH dominated the effectiveness of the decolorization process. The color content could be reduced from 2000 to 200 ADMI (American Dye Manufacture Institute) values within a reaction time of 30 min with the ozone input rate of 2.66 g/h. The pH values of 3 and 10 favored decolorization of Blue-19 and Orange-13, respectively. This was due to the effects that reactive and oxidizing species of molecular ozone and hydroxyl radicals were predominant at low and high pH, respectively. Moreover, molecular ozone was more selective to certain dye structures during the oxidation process. Kinetic analyses show that decolorization of Orange-13 and Blue-19 followed first-order kinetics. The degree of decolorization was primarily proportional to the ozone dosage. Results from this study provide insights into the characteristics and mechanisms of decolorization by the O3 technique. Results will also aid in designing a system for practical application.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 249, Issue 3, 25 December 2009, Pages 1238–1242
نویسندگان
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