کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7703710 1496870 2017 36 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Persulfate-enhanced sonochemical degradation of naphthol blue black in water: Evidence of sulfate radical formation
ترجمه فارسی عنوان
تخریب سونوشیمی شیمیایی نارسولفاته نفتال سیاه در آب: شواهد تشکیل رادیکال سولفات
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
چکیده انگلیسی
This work explores the effect of persulfate (PS) on the sonochemical degradation of organic pollutants taking naphthol blue black (NBB), an anionic diazo dye, as a substrate model. The sonolytic experiments were conducted in the absence and presence of PS under various experimental conditions including acoustic power (10−80 W), frequency (20 and 585 kHz) and saturating gas (argon, air and nitrogen). Experimental results showed that PS decomposition into sulfate radical (SO4−) takes place by sonolysis and increasing PS concentration up to 1 g/L would result in an increase in the NBB degradation rate. It was found that the PS-enhanced effect was strongly operating parameters dependent. The positive effect of PS decreased with increasing power and the best enhancing effect was obtained for the lowest acoustic power. Correspondingly, the PS-enhanced effect was more remarkable at low frequency (20 kHz) than that observed at high frequency ultrasound (585 kHz). Nitrogen saturating gas gave the best enhanced effect of PS than argon and air atmospheres. Theoretical (computer simulation of bubble collapse) and experimental measurements of the yields of free radical generation under the different experimental conditions have been made for interpreting the obtained effects of PS on the sonochemical degradation of the dye pollutant. The experimental findings were attributed to the fact that radical-radical recombination reactions occur at faster rate than the radical-organic reaction when the concentration of free radicals is too high (at higher sonochemical conditions).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 34, January 2017, Pages 580-587
نویسندگان
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