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Closed-loop recycling of colored regenerated cellulose fibers from the dyed cotton textile waste

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Abstract

Worldwide, 45 million tons of waste cotton textiles are produced annually, of which 75% is burned and buried, leading to serious environmental pollution. In this study, a method for directly preparing colored regenerated cellulose fibers (CRCFs) from dyed cotton textile waste (DCTW) was demonstrated. The tensile strength of CRCFs reached 226 MPa, which was equivalent to that of commercial viscose fibers. CRCFs exhibited excellent color fastness and hydrophilicity. In addition, CRCFs can be reprocessed into secondary CRCFs. The tensile strength of secondary CRCFs was 14.64% less than that of the primary CRCFs due to the reduction in the polymerization degree of secondary CRCFs; however, it also can be woven into fabrics. The exploration of the secondary utilization of CRCFs provides an experimental basis for prolonging the service life of DCTW. This approach of preparing CRCFs achieves closed-loop recycling of waste colored cellulose textiles and prevents environmental pollution caused by decoloring and dyeing.

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Funding

The authors acknowledge the financial support from National Natural Science Foundation of China (No. 52073224), Textile Vision Basic Research Program of China (No. J202110), Advanced Manufacturing Technology Project of Xi’an Science and Technology Bureau (No. 21XJZZ0019), Key Research and Development Program of Xianyang Science and Technology Bureau, China (No. 2021ZDYF-GY-0035), Natural Science Foundation of Shaan Province, China (No. 2021JQ-685), Key Research and Development Program of Shaanxi Province, China (No. 2022SF-470, 2022GY-377, 2022GY-283), the China Postdoctoral Science Foundation (2021M690847), National Natural Science Foundation of China (31901372), and Natural Science Foundation of Jiangsu Province (BK20200775 and BK20190758), Scientific Research Project of Shaanxi Provincial Education Department, China (No. 22JC035).

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Contributions

HL: conceptualization, methodology, data curation, formal analysis, investigation, writing—original draft. WF: conceptualization, project administration, resources, visualization, conceptualization, validation, writing—review and editing. YM: methodology, data curation, formal analysis, investigation. HD: visualization, conceptualization, validation. YS: validation. SW: visualization, validation. XZ: formal analysis. LH: validation. XY: conceptualization. SSL: formal analysis. SG: data curation, investigation.

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Correspondence to Wei Fan.

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The authors have no relevant financial or non-financial interests to disclose.

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Liu, H., Fan, W., Miao, Y. et al. Closed-loop recycling of colored regenerated cellulose fibers from the dyed cotton textile waste. Cellulose 30, 2597–2610 (2023). https://doi.org/10.1007/s10570-022-05002-w

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  • DOI: https://doi.org/10.1007/s10570-022-05002-w

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