Abstract:Experimental dependency of the photosystem's response on the wavelength of exciting radiation, also known as action spectrum, may be substantially affected by the spectrum shape of this radiation. This is especially important in the case, when different radiation sources are used for the investigation of action spectrum. For instance, too wide emission peaks of radiation sources can blur the scopes of actual action spectrum and distort information about the properties of photosystem at certain wavelength regio… Show more
“…The photonic efficiency of the photocatalytic reaction can be expressed according to IUPAC recommendations as follows [ 51 ]: where is the photonic efficiency (%), is the reaction rate (s −1 ), is the incident photon flux (s −1 ), is the steady-state rate of CO 2 formation measured in the setup (µmol min −1 ), 7 × 10 17 is the photon flux (s −1 ), and is the conversional factor (16 charge pairs and, consequently, at least 16 photons are required to oxidize 1 molecule of acetone; 3 molecules of CO 2 are formed from 1 molecule of acetone during 1 act of reaction). The details on the measurement of action spectra can be found in recently published papers [ 52 , 53 ].…”
This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO2. The synthesis is performed using titanium oxysulfate as a low-cost inorganic precursor and ammonia as a precipitating agent, as well as a source of nitrogen. Mixing the reagents under a control of pH leads to an amorphous titanium oxide hydrate, which can be further successfully converted to nanocrystalline anatase TiO2 through calcination in air at an increased temperature. The as-prepared N-doped TiO2 provides the complete oxidation of volatile organic compounds both under UV and visible light, and the action spectrum of N-doped TiO2 correlates to its absorption spectrum. The key role of paramagnetic nitrogen species in the absorption of visible light and in the visible-light-activity of N-doped TiO2 is shown using the EPR technique. Surface modification of N-doped TiO2 with copper species prevents its intense deactivation under highly powerful radiation and results in a nanocomposite photocatalyst with enhanced activity and stability. The photocatalysts prepared under different conditions are discussed regarding the effects of their characteristics on photocatalytic activity under UV and visible light.
“…The photonic efficiency of the photocatalytic reaction can be expressed according to IUPAC recommendations as follows [ 51 ]: where is the photonic efficiency (%), is the reaction rate (s −1 ), is the incident photon flux (s −1 ), is the steady-state rate of CO 2 formation measured in the setup (µmol min −1 ), 7 × 10 17 is the photon flux (s −1 ), and is the conversional factor (16 charge pairs and, consequently, at least 16 photons are required to oxidize 1 molecule of acetone; 3 molecules of CO 2 are formed from 1 molecule of acetone during 1 act of reaction). The details on the measurement of action spectra can be found in recently published papers [ 52 , 53 ].…”
This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO2. The synthesis is performed using titanium oxysulfate as a low-cost inorganic precursor and ammonia as a precipitating agent, as well as a source of nitrogen. Mixing the reagents under a control of pH leads to an amorphous titanium oxide hydrate, which can be further successfully converted to nanocrystalline anatase TiO2 through calcination in air at an increased temperature. The as-prepared N-doped TiO2 provides the complete oxidation of volatile organic compounds both under UV and visible light, and the action spectrum of N-doped TiO2 correlates to its absorption spectrum. The key role of paramagnetic nitrogen species in the absorption of visible light and in the visible-light-activity of N-doped TiO2 is shown using the EPR technique. Surface modification of N-doped TiO2 with copper species prevents its intense deactivation under highly powerful radiation and results in a nanocomposite photocatalyst with enhanced activity and stability. The photocatalysts prepared under different conditions are discussed regarding the effects of their characteristics on photocatalytic activity under UV and visible light.
“…Photocatalysis serves as a remarkable solution for various environmental challenges. 14,211 The conventional semiconductors employed as photocatalysts include ZnO, 212,213 TiO 2 , 214,215 CdS, 216,217 etc., which play a significant role in the degradation of environmental contaminants. Photocatalysis is a costeffective, fast and straightforward method for the cleansing of organic and inorganic contaminants from wastewater.…”
Section: Photo Catalysis Mechanisms: Understanding the Science Behind...mentioning
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