Journal
DYES AND PIGMENTS
Volume 115, Issue -, Pages 88-95Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2014.12.018
Keywords
Clean fixation; Supercritical carbon dioxide; Phase transfer catalysis; Cotton; Reactive disperse dye; Catalytic reaction mechanism
Funding
- National Natural Science Foundation [21076133]
- Natural Science Foundation, Jiangsu province [BK2008163]
- Academic Foundation for Undergraduate of Soochow University [KY2012013Z]
- Soochow University, Jiangsu Province and National support of China [201210285026]
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A clean fixation of disperse reactive dye on cotton was investigated by employing a heterogeneous and phase transfer catalytical reaction with a phase transfer agent in a liquid-supercritical-solid triphase system, as an environmentally friendly alternative to conventional and heavy pollutional wet-chemical process. The catalytic fixation reaction was characterized by color intensity, fixation efficiency and Fourier transform infrared spectrometry (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM). The results show that the dye fixation through a nucleophilic addition at a solid cellulosic polymer substrate phase could be effectively facilitated as the transportation of the anion of OH- or CO32- by the phase transfer catalyst of FC-134 from a liquid phase to supercritical phase and then onto the solid substrate in a self-built reactor. A heterogeneous and triphase transfer catalytic reaction mechanism was also supposed for the dye fixation at the solid substrate in supercritical carbon dioxide fluid with the presence of a base. (C) 2014 Elsevier Ltd. All rights reserved.
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