Studying the governing factors on the photo(electro)catalytic activity of surface-modified photocatalysts under visible light illumination

Tabari, Taymaz; Łabuz, Przemysław; Nowakowska, Anna; Kobielusz, Marcin; Pacia, Michał; Macyk, Wojciech

doi:10.1016/j.dyepig.2023.111154

Cited by 2 publications

(2 citation statements)

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“…Given the redox properties of the adsorbed (metallo)porphyrins and P25, the observed visible light-induced photocurrents may be due to electron transfer from the excited dyes to the TiO 2 conduction band. Tabari et al recorded the generation of photocurrent when surface-modified TiO 2 remained unchanged under different polarization conditions, whether negative or positive ones [68]. Upon UV irradiation in the studied potential range, pristine TiO 2 generates anodic photocurrents.…”

Section: Photolectrochemical Measurementsmentioning

confidence: 99%

“…At higher light doses, both materials as well as unmodified porphyrins generate singlet oxygen to a similar extent, suggesting that the application of PdF 2 POH to the composite material does not enhance the generation of 1 O 2 (Figure 6B). Tabari et al recorded the generation of photocurrent when surface-modified TiO2 remained unchanged under different polarization conditions, whether negative or positive ones [68]. Upon UV irradiation in the studied potential range, pristine TiO2 generates anodic photocurrents.…”

Section: Detection Of Reactive Oxygen Species In Heterogeneous Systemmentioning

confidence: 99%

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Enhancing Visible-Light Photocatalysis with Pd(II) Porphyrin-Based TiO2 Hybrid Nanomaterials: Preparation, Characterization, ROS Generation, and Photocatalytic Activity

Malec,

Warszyńska,

Repetowski

et al. 2023

Molecules

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Novel hybrid TiO2-based materials were obtained by adsorption of two different porphyrins on the surface of nanoparticles—commercially available 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS) and properly modified metalloporphyrin—5,10,15,20-tetrakis(2,6-difluoro-3-sulfophenyl)porphyrin palladium(II) (PdF2POH). The immobilization of porphyrins on the surface of TiO2 was possible due to the presence of sulfonyl groups. To further elevate the adsorption of porphyrin, an anchoring linker—4-hydroxybenzoic acid (PHBA)—was used. The synthesis of hybrid materials was proven by electronic absorption spectroscopy, dynamic light scattering (DLS), and photoelectrochemistry. Results prove the successful photosensitization of TiO2 to visible light by both porphyrins. However, the presence of the palladium ion in the modifier structure played a key role in strong adsorption, enhanced charge separation, and thus effective photosensitization. The incorporation of halogenated metalloporphyrins into TiO2 facilitates the enhancement of the comprehensive characteristics of the investigated materials and enables the evaluation of their performance under visible light. The effectiveness of reactive oxygen species (ROS) generation was also determined. Porphyrin-based materials with the addition of PHBA seemed to generate ROS more effectively than other composites. Interestingly, modifications influenced the generation of singlet oxygen for TPPS but not hydroxyl radical, in contrast to PdF2POH, where singlet oxygen generation was not influenced but hydroxyl radical generation was increased. Palladium (II) porphyrin-modified materials were characterized by higher photostability than TPPS-based nanostructures, as TPPS@PHBA-P25 materials showed the highest singlet oxygen generation and may be oxidized during light exposure. Photocatalytic activity tests with two model pollutants—methylene blue (MB) and the opioid drug tramadol (TRML)—confirmed the light dose-dependent degradation of those two compounds, especially PdF2POH@P25, which led to the virtually complete degradation of MB.

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Section: Photolectrochemical Measurementsmentioning

confidence: 99%

Section: Detection Of Reactive Oxygen Species In Heterogeneous Systemmentioning

confidence: 99%