| Abstrakt: |
This work presents the valorization of Millettia laurentii carpentry sawdust waste into sustainable natural dye for ecological dyeing and functional finishing of wool textiles. A simple aqueous extraction method was used to isolate natural dye, then the extracted bio-dye was subjected to different qualitative and quantitative analyses. Wool yarns were dyed in conjunction with different metal salts (aluminum sulfate, ferrous sulfate, copper sulfate, and zinc sulfate) and their binary combinations (Al/Fe, Al/Cu, Al/Zn, Fe/Cu, Fe/Zn, and Cu/Zn) as mordants. Practically, 11 different eco-friendly shades were developed of varying hues and tones employing 75% (o.w.f.) of M. laurentii sawdust. The antibacterial action against E. coli and S. aureus, free radical scavenging power, and UV protection properties of dyed wool yarns were recorded. The introduction of different metal salts and their combinations enhanced the color properties with a semi-durable antimicrobial and antioxidant finish. Statistical analysis of the color parameters of binary mixed metal combinations confirms the synergetic contribution of individual metal ions in each combination. The amount of individual mordant adsorbed (weight percentage) from a particular combination was further assessed by EDX analysis of mordanted dyed wool yarns. Overall, the results suggest that copper sulfate and ferrous sulfate pre-treatment were the best combinations (Fe/Cu) for wool yarns in conjunction with 75.0% (o.w.f.) M. laurentii sawdust, considering the color fastness, antimicrobial, and antioxidant properties. The results provide ample scope for the upcycling of timber industry waste into a natural dye for the eco-friendly coloration of wool textiles. [ABSTRACT FROM AUTHOR] |
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