The accessibility of cotton to dyes /
Abstract: The adsorption of two non-ionic dyes by cotton and viscose fibres has been studied, with the objective of measuring the area of accessible cellulose in the fibres. Earlier work had shown that direct dye adsorption can occur by formation of a'-Trtono layer, followed by multilayer sorpt...
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| Resumo: | Abstract: The adsorption of two non-ionic dyes by cotton and viscose fibres has been studied, with the objective of measuring the area of accessible cellulose in the fibres. Earlier work had shown that direct dye adsorption can occur by formation of a'-Trtono layer, followed by multilayer sorption. The ionic charge of these dyes made the calculation of accessible surface uncertain. The solubility of CI Solvent Red 1 was substantially increased by addition of 200 g litre 1 urea and 10 g litre 1 Dyapol G, and adsorption isotherms for cotton and viscose plotted. In the case of CI Disperse Black 1, 100 g litre * phenol was used to increase solubility. The isotherms all showed evidence of monolayer formation and the 2 -1 corresponding accessible areas were calculated (29.93 and 43.45 m g 2 -1 for cotton and 57.56 and 49.20 m g for viscose rayon for CI Solvent Red 1 and CI Disperse Black 1 respectively). The experimental difficulties were considerable and reproducibility was not always satisfactory but the results provide more evidence that initial dye sorption on cellulosic fibres is related to accessible surface area. |
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