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Robust ZnO/HNTs-based superhydrophobic cotton fabrics with UV shielding, self-cleaning, photocatalysis, and oil/water separation

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Abstract

In this work, robust superhydrophobic cotton fabrics with ultraviolet (UV) shielding, self-cleaning, photocatalysis, and oil/water separation were successfully prepared based on micro/nano hierarchical ZnO/HNTs (halloysite nanotubes) hybrid particles and silicone elastomer polydimethylsiloxane (PDMS). ZnO/HNTs hybrid particles were prepared by in-situ growth of ZnO nanoparticles on the surface of halloysite nanotubes (HNTs). ZnO/HNTs hybrid particles and PDMS were used to successively coat cotton fabrics by dip-coating approach. The coated cotton fabrics displayed excellent superhydrophobicity with a water contact angle (WCA) of 162.5 ± 1.0° owing to the roughness provided by micro/nano hierarchical ZnO/HNTs hybrid particles and low surface energy achieved by PDMS. After being exposed to the UV lamp for 5 h, about 90.8% of the methylene blue was degraded, indicating that the coated cotton fabrics had excellent photocatalytic activity. The as-prepared cotton fabrics also displayed outstanding self-cleaning and antifouling properties. In addition, due to both superhydrophobic and superoleophilic characteristics, the as-prepared cotton fabrics could be used to separate several oil/water mixtures and showed good recoverability. The superhydrophobic cotton fabrics also exhibited excellent UV shielding performance with a large ultraviolet protection factor (UPF) of 1643.28 due to strong ultraviolet-absorption, light scattering and frequent light reflection of ZnO nanoparticles from ZnO/HNTs composites coated on cotton fabrics. Importantly, the as-prepared cotton fabrics retained superhydrophobic performance after 2000 cycles rubbing, 90 h UV illumination, and immersing in acidic and alkali solutions with different pH values ranging from 1 to 14 for 1 h. These characteristics made multifunctional cotton fabrics a satisfactory candidate in various promising fields.

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Acknowledgments

This work was financially supported by Shanghai Natural Science Foundation (21ZR426200) and National Natural Science Foundation of China (51703123).

Funding

This work was financially supported by Shanghai Natural Science Foundation (21ZR426200) and National Natural Science Foundation of China (51703123).

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Correspondence to Lihui Xu.

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Xu, W., Xu, L., Pan, H. et al. Robust ZnO/HNTs-based superhydrophobic cotton fabrics with UV shielding, self-cleaning, photocatalysis, and oil/water separation. Cellulose 29, 4021–4037 (2022). https://doi.org/10.1007/s10570-022-04462-4

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  • DOI: https://doi.org/10.1007/s10570-022-04462-4

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