Abstract
A tuneable green process of textile cleaning is being optimized. The cleaning is achieved with supercritical carbon dioxide and an aqueous suspension as co-solvent. We managed to lower the operational pressure and examine the effect of the Ca(OH)2 concentration on the cleaning result. Soil and colour migration, particle size distribution and their possible effect on the cleaning result as well as the CaCO3 particle deposition have been studied. The optimal operational pressure is 150bar at 40°C while the proposed Ca(OH)2 concentration is 5% w/w. The cleaning efficiencies reported on olive rabbit skin glue and beetroot paste are 97%, 99% and 97% respectively. No colour and/or soil migration to other parts of the textiles was observed. The optimized process has been successfully applied on textiles infected with Aspergillus Niger fungi. The combination of the exposure of the textile in a Ca(OH)2 aqueous dispersion and the exposure in scCO2 and CaCO3 particles produced in situ leads to textile⿿s disinfection. No chemical disinfectants are used nor required. The proposed, optimized process is a tuneable green cleaning process which can be easily adjusted to any type of soiling. Characterization of the soiled and cleaned textiles was performed by means of weight loss (soil removal efficiency), colour measurements, optical microscopy, XRF analysis, UV⿿vis absorption and imaging techniques.
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