Using photolabile protecting groups for the controlled release of bioactive volatiles

Herrmann, Andreas

doi:10.1039/c1pp05231d

Cited by 86 publications

(111 citation statements)

References 88 publications

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“…51,52 Thus, this electron transfer may destroy the regular distribution of conjugated bonds within the dye molecule, and cause its decolourisation, but not its mineralisation. 53,54 The photocatalytic tests in liquid-solid phase, were assessed by monitoring the degradation of MB (Aldrich), using a spectrometer (Shimadzu UV 3100, JP).…”

Section: Evaluation Of Photocatalytic Activity (Pca)mentioning

confidence: 99%

Non-aqueous sol–gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity

et al. 2014

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A novel, facile method based on a non-aqueous sol-gel solvothermal process has been developed to synthesise spherical TiO 2 nanoparticles (NPs) in one pot. The reaction between titanium (IV) tert-butoxide (Ti[OC(CH 3 ) 3 ] 4 ) and benzyl alcohol is a simple procedure, that resulted in the formation of highly crystalline titania NPs with a small size of only 6 nm, and with a correspondingly high surface area. The chemical formation mechanism of the metal oxide NPs has been proposed, and the degree of surface hydroxyls (-OH groups) examined. The products of the synthesis were characterised by X-ray powder diffraction (XRPD) including the advanced whole powder pattern modelling (WPPM) method, high-resolution transmission electron microscopy (HR-TEM), thermo-gravimetric analysis (TGA), UV-visible diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FT-IR), and nuclear magnetic resonance (NMR). The photocatalytic activity (PCA) was evaluated both in liquidsolid phase, by monitoring the degradation of an organic dye (methylene blue (MB)) under UV-light irradiation, and in gas-solid phase, by following the degradation of 2-propanol, under UV-and visible-light exposure. The synthesized titania powders showed themselves to be excellent photocatalysts in liquid-solid phase (under UV irradiation), but also to possess a superior PCA in gas-solid phase, under visible-light exposure. The effects on the PCA of the very small crystalline domain size, surface composition and the presence of organic molecules from the synthesis process of the TiO 2 NPs were shown to account for this behaviour.

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Section: Evaluation Of Photocatalytic Activity (Pca)mentioning

confidence: 99%

Non-aqueous sol–gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity

et al. 2014

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“…Photocatalysis is very often used for water cleaning, namely to decompose organic contaminants present in water [1].…”

Section: Introductionmentioning

confidence: 99%

Influence of water temperature on the photocatalytic activity of titanium dioxide

Janus

Kusiak-Nejman

Morawski

2012

Reac Kinet Mech Cat

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In this study, it was shown that a possible explanation of increasing photocatalytic activity with temperature may be the fact that with increasing water temperature, the amount of hydroxyl radicals in water also increases, because the ionic product of water increases with an increase in temperature. For measurements of the amount of hydroxyl radicals, the fluorescence technique was used. Terephthalic acid was used as a hydroxyl radical scavenger. After inducing of TiO 2 , positive holes in the valance band may react with OH ions and produce• OH radicals, a strong oxidizing agent.

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“…Here, the degradation percentage s is defined as s ¼ ð1 À C=C 0 Þ Â 100%, it is also called conversion in some articles. 42 When comparing the curves of different flow rates, one can see that high flow rate leads to a low degradation percentage. This is because faster flow causes shorter residence time in the reaction chamber (and thus shorter reaction time).…”

Section: Effects Of Light Source Intensity and Temperaturementioning

confidence: 99%

Microfluidic reactors for visible-light photocatalytic water purification assisted with thermolysis

Wang¹,

Tan²,

Wan³

et al. 2014

Biomicrofluidics

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Photocatalytic water purification using visible light is under intense research in the hope to use sunlight efficiently, but the conventional bulk reactors are slow and complicated. This paper presents an integrated microfluidic planar reactor for visible-light photocatalysis with the merits of fine flow control, short reaction time, small sample volume, and long photocatalyst durability. One additional feature is that it enables one to use both the light and the heat energy of the light source simultaneously. The reactor consists of a BiVO 4 -coated glass as the substrate, a blank glass slide as the cover, and a UV-curable adhesive layer as the spacer and sealant. A blue light emitting diode panel (footprint 10 mm Â 10 mm) is mounted on the microreactor to provide uniform irradiation over the whole reactor chamber, ensuring optimal utilization of the photons and easy adjustments of the light intensity and the reaction temperature. This microreactor may provide a versatile platform for studying the photocatalysis under combined conditions such as different temperatures, different light intensities, and different flow rates. Moreover, the microreactor demonstrates significant photodegradation with a reaction time of about 10 s, much shorter than typically a few hours using the bulk reactors, showing its potential as a rapid kit for characterization of photocatalyst performance.

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Using photolabile protecting groups for the controlled release of bioactive volatiles

Cited by 86 publications

References 88 publications

Non-aqueous sol–gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity

Non-aqueous sol–gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity

Influence of water temperature on the photocatalytic activity of titanium dioxide

Microfluidic reactors for visible-light photocatalytic water purification assisted with thermolysis

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