Titanium dioxide (TiO2) and ferric-doped TiO2 (Fe-TiO2) thin films were synthesized on the surface of 304 stainless steel sheets using a simplified sol-gel preparation method. The Fe-TiO2 thin films were prepared with weight-to-volume ratios of /TiO2 of 0.3%, 0.5%, and 0.7%, respectively. The crystalline phase structures of the prepared TiO2 and Fe-TiO2 thin films were entirely anatase. The measured optical band gaps of the TiO2, 0.3% Fe-TiO2, 0.5% Fe-TiO2, and 0.7% Fe-TiO2 thin films were 3.27, 3.28, 3.22, and 2.82 eV, respectively. The grain sizes and other physical properties of the prepared thin films were also reported. The kinetics of the photocatalytic processes under a UV-LED light source could be explained by the Langmuir-Hinshelwood kinetic model with the specific rates of , , , and  , for TiO2, 0.3% Fe-TiO2, 0.5% Fe-TiO2, and 0.7% Fe-TiO2, respectively. An increase in dopant concentration could enhance the photocatalytic activity of toluene decomposition as a result of lower optical band gaps, smaller grain size, and higher surface area.

/pdf/photocatalytic-activity-of-toluene-under-uv-led-light-with-2kbtc4g90j.pdf

Photocatalytic Activity of Toluene under UV-LED Light with TiO2 Thin Films

Titanium dioxide (TiO2) thin films were prepared using a sol–gel process and applying between two and five coating layers onto the surface of borosilicate glass slides and 304 stainless steel sheets. The physical properties of the multilayer TiO2 thin films on both of the substrates under the same fabrication process were systematically compared. Our results indicate that the crystalline phase structure of the prepared TiO2 thin film was entirely composed of anatase with an optical band gap of 3·27 eV. The grain sizes of the TiO2 crystals in the films on the glass slides and the stainless steel sheets were in the ranges of 15–100 nm and 20–250 nm respectively. The results suggested that at least three layers of coating were required to produce the TiO2 thin film with the desired range of properties.

Properties of TiO2 thin films prepared using sol–gel process

TiO2:Au-based photocatalysis represents a promising alternative to remove contaminants of emerging concern (CECs) from wastewater under sunlight irradiation. However, spherical Au nanoparticles, generally used to sensitize TiO2, still limit the photocatalytic spectral band to the 520 nm region, neglecting a high part of sun radiation. Here, a ligand-free synthesis of TiO2:Au nanostars is reported, substantially expanding the light absorption spectral region. TiO2:Au nanostars with different Au component sizes and branching were generated and tested in the degradation of the antibiotic ciprofloxacin. Interestingly, nanoparticles with the smallest branching showed the highest photocatalytic degradation, 83% and 89% under UV and visible radiation, together with a threshold in photocatalytic activity in the red region. The applicability of these multicomponent nanoparticles was further explored with their incorporation into a porous matrix based on PVDF-HFP to open the way for a reusable energy cost-effective system in the photodegradation of polluted waters containing CECs.

/pdf/size-effect-in-hybrid-tio2-au-nanostars-for-photocatalytic-3dtux41g.pdf

Size Effect in Hybrid TiO2:Au Nanostars for Photocatalytic Water Remediation Applications

Highly ordered TiO2 nanotube array (TNA) films were fabricated by anodic oxidation of Ti foil. Au nanoparticles (NPs) are decorated onto the top of TNA films with the aid of ion-sputtering and thermal annealing. The steady-state photoluminescence (PL) spectra, as well as x-ray photoelectron spectroscopy (XPS) and Raman analysis, confirm the presence of Ti3+ valence states in the prepared TNA films. The UV–vis absorption spectra show that the photo-response of as-prepared samples is extended from UV to the visible light region. From the nanosecond time-resolved transient photoluminescence (NTRT-PL) spectra, Ti3+-related PL intensity is observed to vary distinctly with the deposition time of Au NPs. Such a phenomenon could be explained by considering the modulation of oxygen vacancy densities and charge states in TNA films by surface loading Au NPs. The enhanced visible-light photocatalytic activities of the Au-TNA composite were evaluated through the photodegradation of methyl orange (MO) in aqueous solution by UV–vis absorption spectrometry. The decoration of Au NPs plays an essential role in enhancing visible-light photocatalytic activity, because energetic photoelectrons are able to inject to the conduction band of TiO2 owing to the surface plasmon resonance (SPR) effect. It is hoped that our current work will provide a simple strategy to synthesize defect-related composite for photocatalytic applications.

https://iopscience.iop.org/article/10.1088/2053-1591/1/4/045033/pdf

Optically modulated charge transfer in TiO2-Au nano-complexes

In this study, a new brookite TiO2/monolayer Ti3C2Tx MXene/Au composite was developed for photocatalytic synthesis of hydrogen peroxide (H2O2). The optimal ratios of MXene and Au were found to be...

Boosting Hydrogen Peroxide Production of Brookite TiO2 with Au and MXene Co-catalysis under UV Light

Fabrication of a TiO2/Au Nanorod Array for Enhanced Photocatalysis

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Fabrication of a TiO2/Au Nanorod Array for Enhanced Photocatalysis