tempo and titanium-dioxide

tempo has been researched along with titanium-dioxide* in 4 studies

Other Studies

4 other study(ies) available for tempo and titanium-dioxide

ArticleYear
Cooperative TiO
    Chemosphere, 2021, Volume: 262

    TiO

    Topics: Adsorption; Amines; Catalysis; Cyclic N-Oxides; Imines; Light; Oxidation-Reduction; Semiconductors; Succinimides; Titanium; Ultraviolet Rays

2021
Role of functional groups in the production of self-assembled microfibrillated cellulose hybrid frameworks and influence on separation mechanisms of dye from aqueous medium.
    International journal of biological macromolecules, 2020, Jul-15, Volume: 155

    Topics: Biocatalysis; Cellulose; Coloring Agents; Cyclic N-Oxides; Horseradish Peroxidase; Oxidation-Reduction; Surface Properties; Titanium; Water; Water Purification

2020
Theoretical study of absorption of 2,2,6,6-tetramethylpiperidine-1-oxoammonium cation (TEMPO) on TiO₂(110) rutile surface.
    Journal of molecular modeling, 2014, Volume: 20, Issue:3

    We present a theoretical study of the adsorption of 2,2,6,6-tetramethylpiperidine-1-oxoammonium cation (TEMPO) onto the TiO₂(110) surface rutile, investigating its bonding nature, electron properties and structural stability. Based on the results obtained with the PBE0/def2-SVP method, natural bond orbital (NBO) analysis suggests a bond order for the O--O bond in complexes 5 and 6, of 0.25 and 0.88, respectively. We also described NBOs for the main interactions of the TiO₂-TEMPO complexes.

    Topics: Adsorption; Cations; Coordination Complexes; Cyclic N-Oxides; Electrons; Hydrogen-Ion Concentration; Models, Chemical; Models, Molecular; Molecular Structure; Solutions; Surface Properties; Titanium; Water

2014
Ultraviolet irradiation of titanium dioxide in aqueous dispersion generates singlet oxygen.
    Redox report : communications in free radical research, 2001, Volume: 6, Issue:5

    We previously reported that irradiation of titanium dioxide (TiO2) in ethanol generates both singlet oxygen (1O2) and superoxide anion (O2*-) as measured by EPR spectroscopy. The present study describes the production of reactive oxygen species upon irradiation of TiO2 in aqueous suspension as determined by EPR spectroscopy using 2,2,6,6-tetramethyl-4-piperidone (4-oxo-TMP) and 5,5-dimethyl-pyrroline-N-oxide (DMPO). Photoproduction of 1O2 by suspended TiO2, detected as 2,2,6,6-tetramethyl-4-piperidone-N-oxyl (4-oxo-TEMPO), was measured in water and deuterium oxide (D2O) in the presence or absence of sodium azide (NaN3) and under air or argon atmospheres. Production of a DMPO-OH adduct was examined in 4-oxo-TMP containing medium in the presence or absence of dimethyl sulfoxide (DMSO). The signal for the DMPO spin adduct of superoxide anion was not observed in aqueous conditions. Kinetic analysis revealed that 1O2 was produced at the surface of irradiated TiO2 in aqueous suspension as was observed in ethanol. Kinetic analysis revealed that the formation of DMPO-OH adduct reflects oxidation of DMPO by 1O2 rather than the trapping of the hydroxyl radical produced by the reaction of photo-exited TiO2 and water. The production of large amounts of 1O2 by TiO2 in aqueous suspension as compared to those in ethanol and possible formation of hydroxyl radical in aqueous suspension but not in alcohol, suggest that irradiation of TiO2 in aqueous environments is biologically more important than that in non-aqueous media.

    Topics: Antioxidants; Cyclic N-Oxides; Electron Spin Resonance Spectroscopy; Hydrogen Peroxide; Photosensitizing Agents; Piperidones; Reactive Oxygen Species; Spin Labels; Spin Trapping; Superoxides; Titanium; Ultraviolet Rays

2001