The Photocatalytic Activity of Titania Coatings Produced by Electrochemical and Chemical Oxidation of Ti6Al4V Substrate, Estimated According to ISO 10678:2010

Abstract

The last twenty years have been a period of intense investigations of materials based on titanium dioxide, which have unique properties and functionalities, and which can be used in various areas of medicine. As a part of this issue, the results of our works for the assessment of the photocatalytic activity of titanium dioxide nanocoatings of different nanoarchitecture (nanoporous, nanotubular, nanosponge-like and nanofibrous examples), which were earlier checked in terms of their biocompatibility and usability for the modification of medical devices’ surfaces, are presented. The studied materials were produced on the surface of Ti6Al4V substrates using electrochemical and chemical oxidation methods. The activity of produced titania materials was studied on the base of the methylene blue (MB) degradation effect, in accordance to ISO 10678:2010. In our works, we have focused on the analysis of the correlation between the photocatalytic activity of nanoarchitecturally different TiO2 coatings, their morphology and structure. The obtained results prove that all studied coatings, both amorphous and amorphous containing crystalline domains, revealed photocatalytic activity in the photoinduced degradation of the organic pollution standard. This activity may be an additional advantage of medical device coatings, being adequate for use in sterilization processes applying UVA light.

Oxo-Titanium(IV) Complex/Polymer Composites—Synthesis, Spectroscopic Characterization and Antimicrobial Activity Test

“…The photocatalytic activity of the (PA + TOCs) systems, with TOCs ( 1 )–( 4 ), was estimated on the basis of the photodecolorization process of the methylene blue (MB) solution irradiated in the UVA range, according to the ISO 10678:2010 procedure [ 38 , 39 ]. The changes of MB concentrations versus irradiation times for the studied (PMMA + TOCs) composites and the reaction observed rate constants are presented in Figure 7 and Table 5 .…”

“…The photocatalytic activity of PMMA + TOCs foils (TOCs = (1)-( 4)) was studied by monitoring the degradation processes of MB aqueous solution according to ISO 10678:2010 procedure and, also, Rhodamine B (RhB) solution [38][39][40]. Foil samples of sizes 10 × 10 mm were preconditioned by exposure to UVA or Vis light for 30 h. In the next step, foils were placed in quartz cuvettes with both dye solutions (V = 3.5 cm 3 and C = 2.0 × 10 −5 M).…”

Indoor Air Photocatalytic Decontamination by UV–Vis Activated CuS/SnO2/WO3 Heterostructure

“…Its main advantage is complete on-site pollutant mineralization without requiring additional storage equipment. The use of singlecomponent photocatalysts such as TiO 2 [17,18], SnO 2 [19], CuO [20,21], and Ag 2 O [22,23], induce limitations in terms of light absorbance spectrum or chemical stability. Studies have shown that heterostructures such as TiO 2 /MnO 2 [24], Cu x O/TiO 2 [25], TiO 2 /SiO 2 [26,27], Ag 2 O/TiO 2 [28], and ZnO/WO 3 [29] are able to efficiently separate the charge carriers in order to reduce recombination, increase charge mobility and use an extended light spectrum.…”

Evaluation of the Cathodic Electrodeposition Effectiveness of the Hydroxyapatite Layer Used in Surface Modification of Ti6Al4V-Based Biomaterials

“…All experiments were carried out using Ti6Al4V alloy (marked as T, grade 5, 99.7% purity) (Strem Chemicals Inc., Bischheim, France), a foil of 0.2 mm thickness, as a base substrate, which was cut into strips of 6 mm wide and 100 mm long. In the first stage, the surface of T substrates was modified by manufacturing TiO 2 nanoporous (T5) coatings and TiO 2 nanofiber (TNF6 and TNF72), and titanate (T5-S and T-S) types, according to methods previously described (all acronyms used in this article are consistent with those used to mark samples in earlier works) [ 10 , 11 , 38 , 39 , 40 ]. Before the next stages of the research, the samples were structurally and morphologically characterized.…”