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Stability and prospect of UV/H_2O_2 activated titania films for biomedical use

机译：UV / H_2O_2活化二氧化钛生物医学薄膜的稳定性和前景

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摘要

Biomedical implants and devices that penetrate soft tissue are highly susceptible to infection, but also accessible for UV induced decontamination through photocatalysis if coated with suitable surfaces. As an on-demand antibacterial strategy, photocatalytic surfaces should be able to maintain their antibacterial properties over repeated activation. This study evaluates the surface properties and photocatalytic performance of titania films obtained by H_2O_2-oxidation and heat treatment of Ti and Ti-6Al-4V substrates, as well as the prospect of assisting photocatalytic reactions with H_2O_2 for improved efficiency. H_2O_2-oxidation generated a nanoporous coating, and subsequent heat treatment above 500 ℃ resulted in anatase formation. Tests using photo-assisted degradation of rhodamine B showed that prior to heat treatment, an initially high photocatalytic activity (PCA) of H_2O_2-oxidized substrates decayed significantly with repeated testing. Heat treating the samples at 600 ℃ resulted in stable yet lower PCA. Addition of 3% H_2O_2 during the photo-assisted reaction led to a substantial increase in PCA due to synergetic effects at the surface and H_2O_2 photolysis, the effect being most notable for non-heat treated samples. Both heat treated and non-heat treated samples showed stable PCA through repeated tests with H_2O_2-assisted photocatalysis, indicating that the combination of H_2O_2-oxidized titania films, UV light and added H_2O_2 can improve efficiency of these photocatalytic surfaces.
机译：穿透软组织的生物医学植入物和设备极易受到感染，但如果涂有合适的表面，则也可通过光催化进行紫外线诱导的去污。作为一种按需的抗菌策略，光催化表面应能够在反复激活后保持其抗菌特性。本研究评估了通过H_2O_2氧化和Ti和Ti-6Al-4V基板的热处理获得的二氧化钛薄膜的表面性能和光催化性能，以及通过H_2O_2辅助光催化反应以提高效率的前景。 H_2O_2-氧化生成纳米多孔涂层，随后在500℃以上进行热处理导致形成锐钛矿。使用罗丹明B光辅助降解的测试表明，在进行热处理之前，H_2O_2氧化的底物最初的高光催化活性（PCA）随着重复测试而显着降低。在600℃下对样品进行热处理可得到稳定但较低的PCA。在光辅助反应过程中添加3％H_2O_2会导致PCA的大幅增加，这是由于表面的协同效应和H_2O_2的光解作用所致，这种影响在未经热处理的样品中最为明显。经过H_2O_2辅助光催化的重复测试，热处理和未热处理的样品均显示出稳定的PCA，表明H_2O_2氧化的二氧化钛膜，紫外线和添加的H_2O_2的组合可以提高这些光催化表面的效率。

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  • 来源
    《Applied Surface Science》 |2013年第ptab期|317-323|共7页
  • 作者

    Erik Unosson; Ken Welch; Cecilia Persson; Haekan Engqvist;

  • 作者单位

    Division of Applied Materials Science, Department of Engineering Sciences, The Aengstroem Laboratory, Uppsala University, Box 534, 75121 Uppsala, Sweden;

    Division of Nanotechnology and Functional Materials, Department of Engineering Sciences, The Aengstroem Laboratory, Uppsala University, Box 534, 75121 Uppsala, Sweden;

    Division of Applied Materials Science, Department of Engineering Sciences, The Aengstroem Laboratory, Uppsala University, Box 534, 75121 Uppsala, Sweden;

    Division of Applied Materials Science, Department of Engineering Sciences, The Aengstroem Laboratory, Uppsala University, Box 534, 75121 Uppsala, Sweden;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    TiO_2; Heat treatment; Photocatalysis; Hydrogen peroxide photolysis; Synergy;

    机译：TiO_2;热处理;光催化;过氧化氢光解;协同作用;

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