Anenvironmentallyfriendlystrategytowardsfabricating fire-retarding, ultraviolet resistance, antibacterial and...

Cellulose-based textiles are prevalent in daily life due to their biodegradability, processability and flexibility. However, increasing their versatility through simple and green strategies remains a challenge. Herein, we propose a straightforward and environmentally benign approach combining in-situ growth and subsequent impregnation to prepare a multifunctional hemp fabric (HF) with flame-retardant, hydrophobicity, anti-ultraviolet (UV) and antibacterial properties. NH₂-UiO(Zr)-66 was first in-situ synthesized on the HF surface using a DMF-free process at room temperature, and then phosphorylated chitosan (PCS) coating was obtained on the HF surface by dip-coating method. Encouragingly, after being coated with three layers of PCS, the HF not only exhibits excellent flame retardancy but also the NH₂-UiO(Zr)-66 can still be observed, which is conducive to subsequent hydrophobic modification. Subsequently, triethoxysilane (TEOS) is used for surface treatment to endow HF with excellent hydrophobicity. The modified HF had high UV-shielding performance, and the UV protection factor achieves 78.41. The modified HF displayed exceptional fire resistance, as indicated by its self-extinguishing behavior, shorter damage length and a significantly enhanced limiting oxygen index (LOI) of 31.6 %. Relative to HF, the peak heat release rate and total heat rate of modified HF are decreased by 79.3 % and 80.43 %, correspondingly. More importantly, the modified HF showed excellent hydrophobicity with a water contact angle of 143.1° and exhibited good anti-fouling ability. Moreover, the modified HF exhibited good antibacterial activity against S. aureus and E. coli. Consequently, the modified HF exhibits extensive potential applications in firefighting gear, outdoor apparel, and both residential and public decoration.