Please use this identifier to cite or link to this item: https://hdl.handle.net/1822/26648

TitleSonochemical and hydrodynamic cavitation reactors for laccase/hydrogen peroxide cotton bleaching
Author(s)Gonçalves, Idalina
Martins, Madalena A.
Loureiro, Ana
Gomes, A. C.
Paulo, Artur Cavaco
Silva, Carla Manuela Pereira Marinho da
KeywordsHomogenization
Cavitation
Hydroxyl radicals
Bleaching
Sonication
Issue date2014
PublisherElsevier
JournalUltrasonics Sonochemistry
Abstract(s)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).
TypeArticle
DescriptionArticle in press
URIhttps://hdl.handle.net/1822/26648
DOI10.1016/j.ultsonch.2013.08.006
ISSN1350-4177
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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