Abstract
Three different Ti6Al4V surface oxidation methods have been applied to obtain three types of titania materials of different nanoarchitecture. Electrochemical oxidation of titanium alloy allowed for obtaining titania nanotubes (TNT), chemical oxidation led to obtain titania nanofibers (TNF), and thermal oxidation gave titania nanowires (TNW). My earlier investigations of these nanomaterials were focused mainly on the estimation of their bioactivity and potential application in modern implantology. In this article, the comparative analysis of the photocatalytic activity of produced systems, as well as the impact of their structure and morphology on this activity, are discussed. The activity of studied nanomaterials was estimated basis of UV-induced degradation of methylene blue and also acetone, and it was determined quantitatively according to the Langmuir–Hinshelwood reaction mechanism. The obtained results were compared to the activity of Pilkington Glass ActivTM (reference sample). Among analyzed systems, titania nanofibers obtained at 140 and 120 °C, possessing anatase and anatase/amorphous structure, as well as titania nanowires obtained at 475 and 500 °C, possessing anatase and anatase/rutile structure, were better photocatalyst than the reference sample. Completely amorphous titania nanotubes, turned out to be an interesting alternative for photocatalytic materials in the form of thin films, however, their photocatalytic activity is lower than for Pilkington Glass ActivTM.
Highlights
The use of modern materials in different technologies requires detailed knowledge on the impact of the structure, morphology, and the physicochemical properties of produced systems on their adequate activity: photocatalytic, optical or biological one
The electrochemical oxidation of titanium alloy (Ti6Al4V), carried out with the use of defined potentials allowed for the formation of TiO2 nanotubular architecture (TNT) on the surface of this substrate
Analysis of scanning electron microscope (SEM) images of samples anodized at higher potentials, of morphologically their arrangement oni.e., the40–60V, surface.indicate
Summary
The use of modern materials in different technologies requires detailed knowledge on the impact of the structure, morphology, and the physicochemical properties of produced systems on their adequate activity: photocatalytic, optical or biological one. TiO2 materials and nanomaterials, are often used in various applications, such as self-cleaning surfaces [1,2,3], anti-fogging mirrors [4,5], antimicrobial coatings, [6,7,8,9] electrochromic devices [10,11,12], rechargeable batteries [13,14], and sensors [15,16] They can be applied in medicine [17,18,19,20], automotive [21,22], and in photocatalytic environmental cleaning of water and air [23,24,25,26]. The crystalline form of TiO2 (anatase and rutile) are mostly used and additional density functional theory (DFT) calculations, which are intended to define the electronic
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