Sonochemical and hydrodynamic cavitation reactors for laccase/hydrogen peroxide cotton bleaching

作者：Goncalves Idalina; Martins Madalena; Loureiro Ana; Gomes Andreia; Cavaco Paulo Artur^*; Silva Carla

来源：Ultrasonics Sonochemistry, 2014, 21(2): 774-781.

DOI：10.1016/j.ultsonch.2013.08.006

• Homogenization
• Sonication
• Cavitation
• Hydroxyl radicals
• Bleaching

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 (R)-C3 and APV-2000. Laccase nano-emulsions 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 degrees C) and operating time (reduction of 90 min).

• 出版日期2014-3