Usage of high frequency ultrasound in cotton finishing [Elektronski vir]
Duran, Kerim ...
Textile wet processes usually consume too much energy, water and produce enormous amounts of textile wastewater which is heavily charged with unconsumed dyes and other chemicals. In order to overcome ...these problems various, novel processes are being introduced or studied. Although several researches on ultrasound have been performed for a long time, it has started to be considered in recent years as an alternative process to the conventional methods to accelerate mass transfer in textile materials. So, same or better results are obtained than existing techniques under less extreme conditions, i.e., lower temperature and lower chemical concentrations. In this paper, the application of high frequency ultrasound on textile bleaching will be discussed. It is very interesting, because the effects of ultrasound between 279 and 817 kHz on bleaching of cotton are examined for the first time. Cotton fabrics are bleached at pH4-7-10 for 20, 40 and 60 minutes. Especially whiteness degrees are very considerable in ultrasonic bleaching without addition of hydrogen peroxide. According to variance analysis, there is significant impact of frequency and duration of processes whiteness degree. Ultrasound treatment has the potential for the use in bleaching as well due to the formation of highly concentrated oxidizing species such as hydroxyl radicals, hydrogen radicals, hydroperoxyl radicals and H2O2, and localized high temperatures and pressures. In addition to bleaching of cotton, TOC values of waste water are evaluated.
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