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Chi-Jung Chang,Yu-Chieh Kao,Jem-Kun Chen,Hao-Cheng Zhang,Shu-Yii Wu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
Since a large amount of waste polyester-cotton blended textiles can cause environmental pollution problems,it is crucial to develop sustainable technology for recycling textile wastes and producing valueaddedproducts. In this research, regenerated cellulose and polyester were obtained from thepolyester-cotton jean wastes by a sustainable process through the selective dissolving of cellulose fibersusing an ionic liquid (ILs), 1-butyl-3-methylimidazolium chloride ([Bmim]Cl). We developed an environmentallybenign decoloration approach without the bleaching or leaching processes. Instead, cellulose,polyester, and ILs were recycled from the selective degradation of indigo carmine (IC) or indigo dye inthe dye/ILs solution using the Bi11VO19 photocatalyst without impairing the dissolution capability ofILs. The selective decoloration of dye solution extracted from waste textiles involves interactions amongphotocatalysts, colorants, fibers, and media (ILs). The changes of dye and ILs molecules during the photocatalysisreaction were analyzed. FTIR and Raman spectra of the recycled ILs reveal that the chemicalstructure of ILs remains unchanged after the photocatalytic decoloration process. The ILs and photocatalystscan be recycled for repeated production of regenerated cellulose from waste jeans.