Comparison of Homogeneous and Heterogeneous Fenton and Sono-Fenton Decolorization of Titan Yellow: Optimization and Synergic Effects Study

سال انتشار: 1398
محل انتشار: نهمین سمینار ملی شیمی و محیط زیست ایران
کد COI اختصاصی: NSCEI09_095
زبان مقاله: انگلیسی
تعداد مشاهده: 424

نویسندگان

Department of Chemistry, Faculty of Science, Ilam University, Ilam, Iran

چکیده

Azo dyes because of their easy and cost effective synthesis have the most applications in industries. Due to their good solubility, they are common water pollutants. Wastewaters containing azo dyes absorb strongly sunlight, reduce photosynthesis of aquatic plants, reduce transparency and responsible for different human diseases. Therefore, removal of dyes from wastewaters has great environmental significance and commercial importance [1]. In this work, four Fenton processes such as homogeneous Fenton, homogeneous Sono-Fenton, heterogeneous Fenton and heterogeneous Sono-Fenton were used for decolorization of titan yellow. Experimental conditions such as H2O2 concentration, pH, time, zero valent iron dose and Fe2+ concentration were optimized by Doehlert experimental design and response surface models. In absent of ultrasonic waves, application of zero valent iron (heterogeneous Fenton) had intense effect on decolorization percent (18% → 95%) with respect to classical Fenton. Although, in this process iron consumption was higher but lower oxidant was used and decolorization time was reduced from 47 to 10 minutes. Both homogeneous and heterogeneous Sono-Fenton processes reached to decolorization percent of 100%. Optimum pH was 2.5 for two processes. In homogeneous Sono-Fenton process, iron consumption is lower but decolorization time is 30 minutes but in the heterogeneous Sono-Fenton process, consumption of H2O2 is lower and decolorization time is 10 minutes. Finally, heterogeneous Sono-Fenton process reached to 100% decolorization at better economic condition and shorter time.

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