Construction of Se@TiO2 nanostructures on polyester surface and investigation of the photocatalytic and antibacterial properties
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摘要: 采用等离子体技术对涤纶针织物进行表面预处理,在涤纶针织物表面负载纳米TiO2,然后通过分子组装法在TiO2/聚对苯二甲酸乙二醇酯(PET)表面生长Se纳米球(SeNPs)和Se纳米线(SeNWs),在涤纶表面构筑Se@TiO2二元复合结构(SeNPs@TiO2/PET和SeNWs@TiO2/PET)。通过扫描电镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、紫外-可见吸收光谱(UV-vis)、光致发光光谱(PL)及光催化和抗菌实验对材料的晶体结构、表面形态、化学组成、光催化性能及抗菌性能等进行表征。通过接触角测试对复合光催化材料的表面润湿性能进行表征。光催化降解实验表明:SeNWs@TiO2/PET在模拟太阳光下具有更高的降解率,其对模型污染物亚甲基蓝降解90 min后,降解率达到98.3%。PL光谱表明,SeNWs@TiO2/PET电子-空穴对的分离率高于SeNPs@TiO2/PET。UV-vis光谱表明,SeNPs@TiO2/PET和SeNWs@TiO2/PET的相对禁带宽度分别为2.8 eV和2.7 eV。两种复合材料对金黄色葡萄球菌和大肠杆菌的抑菌率分别可达到99%和90%以上。Abstract: 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 minutes 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.
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Key words:
- TiO2 /
- Se /
- photocatalysis /
- antibacterial /
- PET
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表 1 Se@TiO2/PET材料表面各元素的相对含量
Table 1. Relative content of elements on the surface of Se@TiO2/PET materials
Sample Relative content of element/
wt%C O Ti Se PET 67.79 32.21 − − SeNPs@TiO2/PET 60.83 37.47 0.69 1.01 SeNWs@TiO2/PET 61.44 34.82 2.83 0.91 表 2 Se@TiO2/PET材料的接触角及吸水时间
Table 2. Contact angle and water absorption time of materials
Sample Contact angle Water
absorption timePET 126.4° n/a SeNPs@TiO2/PET 0° >1 s SeNWs@TiO2/PET 0° >1 s Note: n/a denotes not applicable. 表 3 SeNPs@TiO2/PET和SeNWs@TiO2/PET对大肠杆菌和金黄色葡萄球菌的抑菌率
Table 3. Antibacterial rates of SeNPs@TiO2/PET and SeNWs@TiO2/PET against E.coli and S.aureus
Sample E. coli colony/
(CFU·mL−1)Bacteriostatic rate S. aureus colony/(CFU·mL−1) Bacteriostatic
rateBlank 1.73×106 n/a 0.95×106 n/a TiO2/PET 7.06×105 59.19% 0.84×105 91.16% SeNPs@TiO2/PET 1.38×105 92.03% 1 99.99% SeNWs@TiO2/PET 0.92×105 94.68% 1 99.99% -
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