| Citation: |
ZHAO Ziyao, LUAN Rui, MO Huilin, et al. Construction of Se@TiO2 nanostructures on polyester surface and investigation of the photocatalytic and antibacterial properties[J]. Acta Materiae Compositae Sinica, 2024, 41(11): 6026-6035. DOI: 10.13801/j.cnki.fhclxb.20240013.002
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Surface pretreatment of polyester knitted fabric was carried out using plasma technology. Nano-TiO2 was loaded on the surface of the polyester knitted fabric, and then Se nanospheres (SeNPs) and Se nanowires (SeNWs) were grown on the surface of the TiO2/polyethylene terephthalate (PET) through molecular assembly method. Se@TiO2 binary composite structure was constructed on the surface of the PET (SeNPs@TiO2/PET and SeNWs@TiO2/PET). The crystal structure, surface morphology, chemical composition, photocatalytic and antibacterial properties of the material were characterized by SEM, XRD, XPS, UV-vis, PL, and photocatalytic and antibacterial experiments. Characterize the wetting performance of composite photocatalytic materials through contact angle testing. The results indicate that SeNPs@TiO2/PET and SeNWs@TiO2/PET composite photocatalytic materials have been successfully prepared. The photocatalytic degradation experiment shows that SeNWs@TiO2/PET has a higher degradation rate under sunlight simulation. After 90 min of degradation of the model pollutant methylene blue, the degradation rate reached 98.3%. PL spectrum indicates SeNWs@TiO2/PET separation rate of electron hole pairs is higher than SeNPs@TiO2/PET. The UV-vis spectrum indicates that relative bandgap widths of SeNPs@TiO2/PET and SeNWs@TiO2/PET are 2.8 eV and 2.7 eV, respectively. The antibacterial rates of composite materials against S. aureus and E. coli can reach over 99% and 90%, respectively.
Textiles are commonly used bulk materials in modern society's production and daily life, widely used in clothing, medical and health, civil engineering, construction, packaging, interior decoration and other fields. With the development of the economy and society and the improvement of living standards, the functional requirements for textiles are increasing. Textiles with characteristics such as UV resistance, thermal insulation, self-cleaning, and antibacterial properties are widely studied. This paper uses plasma technology to improve the bonding fastness of TiO and polyester fabrics, and develops a functional textile with photocatalytic and antibacterial properties.
The surface of PET fabric was treated with atmospheric pressure low-temperature plasma technology to improve the surface roughness of the material. At the same time, polar groups were introduced on the surface of the material to enhance its chemical reactivity. This method is energy-saving and water-saving, clean and efficient, easy to operate and control, and has low environmental pollution. Then, the impregnation method is used to load TiO onto the surface of polyester fabric. Then, Se nanospheres (SeNPs) and Se nanowires (SeNWs) were grown on the surface of TiO/PET by molecular assembly method, and constructed Se@TiO binary composite structure (SeNPs@TiO/PET and SeNWs@TiO/PET) on the surface of polyester fabric. The surface morphology, crystal structure, chemical composition, and bandgap width of the material were characterized by scanning electron microscopy (SEM), X-ray energy chromatography (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet visible absorption spectroscopy (UV-vis), and photoluminescence spectroscopy (PL). Characterize the surface wettability of composite photocatalytic materials through contact angle testing. Test the photocatalytic and antibacterial properties of the material through photocatalytic and antibacterial experiments.
The scanning electron microscopy results showed the generation of uniformly sized SeNPs and SeNWs. Combined with EDS results, it was found that SeNPs and SeNWs successfully combined with TiO and were uniformly loaded on the surface of polyester fabric. The XRD test results showed diffraction peaks of PET, rutile TiO, and trigonal phase Se. UV-vis absorption spectrum fitted the bandgap widths of SeNPs@TiO/PET and SeNWs@TiO/PET are 2.8 eV and 2.7 eV, respectively. PL spectrum indicated The separation rate of electron hole pairs in SeNWs@TiO/PET is higher than SeNPs@TiO /PET. The contact angle test results showed that the PET fabric has a contact angle of 126.4 ° and it is hydrophobic. The contact angle of SeNPs@TiO/PET and SeNWs@TiO/PET is 0 °, they are hydrophilic. The photocatalytic degradation experiment showed that SeNWs@TiO/PET has a higher degradation rate of 98.3% under sunlight simulation, after 90 minutes of degradation of the methylene blue. After repeated use and recovery three times during the methylene blue photo degradation process, the photocatalytic activity of SeNPs@TiO/PET and SeNWs@TiO/PET did not significantly decrease and remained above 90%. Antibacterial results indicated that SeNPs@TiO/PET and SeNWs@TiO/PET. Both materials have an antibacterial performance of 99% against Staphylococcus aureus and an antibacterial rate of over 90% against Escherichia coli.Conclusions: This paper used atmospheric pressure low-temperature plasma technology to treat the surface of PET fabric, loads nano TiO on the surface of PET fabric, and then constructed Se@TiO binary composite structure using Se to grow Se crystals on the surface of TiO and fabric. We have developed a functional textile with excellent photocatalytic and antibacterial properties, as well as good durability, which has opened up new ideas for the development of photocatalytic antibacterial functional textiles. The crystal structure of Se in composite photocatalytic materials is amorphous and trigonal, respectively α-Se and t-Se. The p-type semiconductor Se combines with n-type semiconductor TiO to form a p-n heterojunction, generating a potential difference. Under the action of the catalyst's own electric field, the photogenerated electrons and holes are separated. The p-type semiconductor Se with a narrow bandgap can narrow the bandgap width of the n-type semiconductor, causing a significant red shift in the absorption edge of the composite photocatalyst. The bandgap width decreases to 2.7 eV and 2.8 eV, and the photocatalytic performance is significantly improved.
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