کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1265158 972197 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sonochemical and hydrodynamic cavitation reactors for laccase/hydrogen peroxide cotton bleaching
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Sonochemical and hydrodynamic cavitation reactors for laccase/hydrogen peroxide cotton bleaching
چکیده انگلیسی


• We exploit cotton bleaching with laccase–hydrogen peroxide assisted by ultrasound.
• We increased whiteness level and reduced oxidant agent concentration.
• The amount of hydrogen peroxide was reduced 50% and the operating time was reduced 90 min.
• Laccase nanoemulsions were able to increase bleaching efficiency.

The main goal of this work is to develop a novel and environmental-friendly technology for cotton bleaching with reduced processing costs. This work exploits a combined laccase–hydrogen peroxide process assisted by ultrasound. For this purpose, specific reactors were studied, namely ultrasonic power generator type K8 (850 kHz) and ultrasonic bath equipment Ultrasonic cleaner USC600TH (45 kHz). The optimal operating conditions for bleaching were chosen considering the highest levels of hydroxyl radical production and the lowest energy input. The capacity to produce hydroxyl radicals by hydrodynamic cavitation was also assessed in two homogenizers, EmulsiFlex®-C3 and APV-2000. Laccase nanoemulsions were produced by high pressure homogenization using BSA (bovine serum albumin) as emulsifier. The bleaching efficiency of these formulations was tested and the results showed higher whiteness values when compared to free laccase. The combination of laccase–hydrogen peroxide process with ultrasound energy produced higher whiteness levels than those obtained by conventional methods. The amount of hydrogen peroxide was reduced 50% as well as the energy consumption in terms of temperature (reduction of 40 °C) and operating time (reduction of 90 min).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 21, Issue 2, March 2014, Pages 774–781
نویسندگان
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