纳米TiO2光催化技术因其安全性受到广泛关注,无毒和持久的性能。然而,传统的纳米TiO2由于其宽禁带只能被紫外光(λ<387nm)激活,极大地限制了其应用。在本文中,采用自掺杂法制备了纳米TiO2。合成的纳米TiO2是单一的锐钛矿晶型,粒径为10nm,尺寸均匀。此外,纳米TiO2具有较高的稳定性和良好的分散性。更重要的是,纳米TiO2表现出优异的可见光(400-780nm)活性,由于带隙从3.20eV降低到1.80eV(小于2.0eV),并且在纳米颗粒的表面上存在大量的羟基。在抗菌试验中,在家用低功率LED灯照射下,大肠杆菌和金黄色葡萄球菌的抗菌率接近100%,表现出优异的抗菌性能,表明所制备的纳米TiO2在杀菌和抑菌领域具有广阔的应用前景。
Nano-TiO2 photocatalysis technology has attracted wide attention because of its safety, nontoxicity and long-lasting performance. However, traditional nano-TiO2 has been greatly limited in its application because its wide band gap can only be activated by ultraviolet light (λ < 387 nm). In this paper, nano-TiO2 was prepared by self-doping method. The synthesized nano-TiO2 was a single anatase crystal type with a particle size of 10 nm and uniform size. In addition, nano-TiO2 has high stability and good dispersion. More importantly, nano-TiO2 exhibits excellent visible light (400-780 nm) activity due to the decrease of bandgap from 3.20 eV to 1.80 eV (less than 2.0 eV) and the presence of a large number of hydroxyl groups on the surface of the nanoparticles. In the antibacterial test, the antibacterial rate of both E.coli and S.aureus was close to 100 % under the irradiation of household low-power LED lamps, showing excellent antibacterial performance, indicating that the prepared nano-TiO2 has broad application prospects in the field of bactericidal and bacteriostatic.