2 research outputs found
Table1_Photocatalytic degradation of naproxen using TiO2 single nanotubes.DOCX
Herein, TiO2 single-tube (TiO2 ST-NT) powders with and without magnetite Fe3O4 nanoparticles (TiO2 ST-NT@Fe3O4NPs) are presented for the first time as excellent photocatalysts for the degradation of one of the most popular non-steroidal anti-inflammatory drugs (NSAIDs), naproxen (NPX). The TiO2 ST-NT powders were synthesized by anodization followed by etching of the double wall, bending, sonication, ultra-centrifugation, and finally annealing at 600°C. A part of the obtained TiO2 ST-NT powders was decorated with Fe3O4 nanoparticles using a simple one-step decoration process. The best photocatalytic performance of TiO2 ST-NT and TiO2 ST-NT@Fe3O4NPs powders was obtained under the white light (6.2 Ă 10â4 s-1) and the blue light (2.7 Ă 10â4 s-1), respectively. During NPX photodegradation using TiO2 ST-NT powders, three main NPX transformation products (P1, P2, and P3) were detected. Upon excitation with the blue light illumination, TiO2 ST-NT@ Fe3O4NPs powders exhibited higher performance (âŒ80%) than TiO2 ST-NT powders (âŒ23%) within 1 h, resulting in an approximately three times increased photocatalytic rate constant. Moreover, under simulated sunlight conditions, TiO2 ST-NT powders demonstrated remarkable activity, achieving a 94% NPX degradation within 1 h. TiO2 ST-NT and TiO2 ST-NT@Fe3O4NPs powders represent excellent photocatalysts for NPX degradation.</p
Ultrathin TiO<sub>2</sub> Coatings via Atomic Layer Deposition Strongly Improve Cellular Interactions on Planar and Nanotubular Biomedical Ti Substrates
This work aims to investigate the chemical and/or structural
modification
of Ti and Ti-6Al-4V (TiAlV) alloy surfaces to possess even more favorable
properties toward cell growth. These modifications were achieved by
(i) growing TiO2 nanotube layers on these substrates by
anodization, (ii) surface coating by ultrathin TiO2 atomic
layer deposition (ALD), or (iii) by the combination of both. In particular,
an ultrathin TiO2 coating, achieved by 1 cycle of TiO2 ALD, was intended to shade the impurities of F- and V-based
species in tested materials while preserving the original structure
and morphology. The cell growth on TiO2-coated and uncoated
TiO2 nanotube layers, Ti foils, and TiAlV alloy foils were
compared after incubation for up to 72 h. For evaluation of the biocompatibility
of tested materials, cell lines of different tissue origin, including
predominantly MG-63 osteoblastic cells, were used. For all tested
nanomaterials, adding an ultrathin TiO2 coating improved
the growth of MG-63 cells and other cell lines compared with the non-TiO2-coated counterparts. Here, the presented approach of ultrathin
TiO2 coating could be used potentially for improving implants,
especially in terms of shading problematic F- and V-based species
in TiO2 nanotube layers