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Releases of microplastics and chemicals from nonwoven polyester fabric-based polyurethane synthetic leather by photoaging

Shi, Yanqi ; Huang, Hexinyue ; Zheng, Lezhou ; Tian, Yechao ; Gong, Zhimin ; Wang, Jiahao ; Li, Wentao ; Gao, Shixiang

The Science of the total environment, 2023-12, Vol.902, p.166584-166584, Article 166584 [Peer Reviewed Journal]

Elsevier B.V

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  • Title:
    Releases of microplastics and chemicals from nonwoven polyester fabric-based polyurethane synthetic leather by photoaging
  • Author: Shi, Yanqi ; Huang, Hexinyue ; Zheng, Lezhou ; Tian, Yechao ; Gong, Zhimin ; Wang, Jiahao ; Li, Wentao ; Gao, Shixiang
  • Subjects: Microplastic fibers ; Nonwoven polyester fabrics ; Plastic leachate ; Polyurethane synthetic leathers
  • Is Part Of: The Science of the total environment, 2023-12, Vol.902, p.166584-166584, Article 166584
  • Notes: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Description: The nonwoven PET fabrics are chemically, mechanically and thermally treated fiber aggregate without weaving, knitting or braiding, which could be used as a base to make polyurethane (PU) synthetic leather through a series of processing. Our research systematically compared the photoaging behaviors of pure non-woven PET base fabric (NPET-P) and PU synthetic leather (nonwoven PET-base fabrics with PU coating, NPET-U), and their possibilities for microplastic fibers (MPFs) generation and chemical transformation in water. NPET-U was photoaged to a higher oxidation degree with higher O/C ratios and more distinct changes in chemical structures. The amount of MPFs released from NPET-U (1.98 × 107 g/fibers) was significantly lower than that from NPET-P (4.76 × 107 g/fibers) after 360 h light irradiation (p value <0.05) with a slower degradation rate and delayed MPFs release. The lengths and diameters of released MPFs from NPET-U varied within a smaller range than that from NPET-P exposed to UV light irradiation. Natural sunlight aging of fabrics for 365 days was found to be equivalent to approximately 85.3–127.2 h UV aging in the laboratory, which indicated the lab accelerated experiments was extraordinarily intense to simulate natural sunlight aging. Furthermore, abundant calcium and sulfur-contained chemicals were detected in original fabrics and the leachate of 360 h light-aged fabrics using the inductively coupled plasma optical emission spectrometer (ICP-OES). The organic components of the leachate were separated according to their molecular weight with the changes of dissolved organic carbon (DOC), dissolved organic nitrogen (DON), and the UV response over aging time. UV stimulation aggravated the role of plastic polymers as disinfection by-product (DBP) precursors. Nevertheless, although NPET-U could produce more nitrogen-contained chemicals, it had similar formation potentials of nitrogen-containing DBPs as NPET-P. The discussion lucubrated the potential risks of the production of MPFs and chemical release in the leachate with regard to combined plastic pollution. [Display omitted] •MPFs released from nonwoven PET-based PU leather were studied under UV irradiation.•NPET-U had a higher oxidation degree but a slower degradation speed than NPET-P.•Different spinning ways of fabrics partly affected the resistance of MPFs release.•Sunlight aging of fabrics for 365 days equaled 85.3–127.2 h in the laboratory.•UV stimulation aggravated the role of plastic polymers as DBP precursors.
  • Publisher: Elsevier B.V
  • Language: English
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