Please use this identifier to cite or link to this item:

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
Hydroxyl radicals
Issue date2014
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).
DescriptionArticle in press
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

Files in This Item:
File Description SizeFormat 
2013 SONOCHEMICAL AND HYDRODYNAMIC CAVITATION REACTORS FOR LACCASE-HYDROGEN PEROXIDE COTTON BLEACHING.pdfSonochemical and hydrodynamic cavitation reactors for laccase/hydrogen peroxide cotton bleaching1,08 MBAdobe PDFView/Open

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID