کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1269686 1496882 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydroxyl radical formation in batch and continuous flow ultrasonic systems
ترجمه فارسی عنوان
تشکیل رادیکال هیدروکسیل در سیستم های اولتراسونیک جریان پیوسته و پیوسته
کلمات کلیدی
سونوگرافی، دسته ای، جریان مداوم، شاخ دونات، رادیکال هیدروکسیل، دوزیمتری تترفاتال
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
چکیده انگلیسی


• Amplitude and sonication time was proportional to OH formation in batch systems.
• Residence time was more important than energy densities in continuous flow systems.
• Air and Helium sparging resulted lower OH compared to without gas sparging.

The creation of free radicals by ultrasonic cavitation is the main mechanism that leads to chemical degradation of target pollutants and the process is considered an alternative advanced oxidation technology. The goal of this study was to compare the effects of batch and continuous flow ultrasonic systems on the formation of hydroxyl radicals. Ultrasonic batch experiments were conducted in two reactors (small and large) using a standard 20 kHz catenoidal titanium horn at varying amplitudes and sonication times. The effect of saturating gas was also investigated by introducing helium and air at 1 L min−1 into the larger 100 mL reactor. In the continuous flow system, the experiments were conducted with a 20 kHz, 3.3 kW ultrasonic systems using a titanium “donut” horn at varying volumetric flow rates and amplitudes. Formation of hydroxyl radicals was determined using terephthalic acid dosimetry measurements. At the same energy densities, higher hydroxyl radical concentrations were formed in the batch system than in the continuous flow system. Sonication time appeared to be the main factor that influenced the results in batch and continuous flow systems. The two gases (helium and air) did not increase the hydroxyl radical formation at any amplitude or sonication time tested.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 22, January 2015, Pages 600–606
نویسندگان
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