photocatalyst


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photocatalyst

 [fo″to-kat´ah-list]
a substance, e.g., chlorophyll, that brings about a chemical reaction on exposure to light.

pho·to·cat·a·lyst

(fō'tō-kat'ă-list),
A substance that helps bring about a light-catalyzed reaction; for example, chlorophyll.
[photo- + G. katalysis, dissolution (catalysis)]

pho·to·cat·a·lyst

(fō'tō-kat'ă-list)
A substance that helps bring about a light-catalyzed reaction, e.g., chlorophyll.
[photo- + G. katalysis, dissolution (catalysis)]
References in periodicals archive ?
The effect of controlling analytical parameters such as dosage of MFN photocatalyst, concentration of CV dye, time and pH were also studied for the maximum percent degradation of CV dye.
Xu has synthesized inorganic imprinted photocatalyst Fe3O4 @ SiO2 @ imprinted TiO2.
This increase in the degradation rate can be explained by the relative growth of the number of reactive species produced by the photocatalyst throughout the process as the concentration of oxidable substrate decreases [42].
One of the main reasons of photocatalyst deactivation is the adsorption of heavy/poisonous reaction intermediates/by-products on active sites (Mo et al.
According to the researchers, the iron molecule in question could be used in new types of photocatalysts for the production of solar fuel, either as hydrogen through water splitting or as methanol from carbon dioxide.
Previously a blank test (photolysis) was made using no photocatalyst, and posteriorly in each solution, 0.350 g [28] of each photocatalytic powder was added and the reactions had the duration of 6 hours with removal of aliquots every 30 min that were analyzed through gas chromatography (GC-FID) in the chromatograph Varian CP-3800 with a flame ionization detector in column (Stabilvax-Restec 30 m, 0.25 mm inner diameter) using the technique SPME (solid phase microextraction) that adsorbs volatile organic compounds of aqueous samples on fiber (75 [micro]m Carboxen/PDMS, SUPELCO) by heating (headspace method) and flow rate [N.sub.2] 1.0m L x [min.sup.-1].
Regardless of the resulting material, it is observed that the sol-gel method remains as the preferred one for the photocatalyst synthesis and it can be also used as complimentary step of the hydrothermal method to obtain 1D Ti[O.sub.2].
Zhong et al., "Phase junction CdS: High efficient and stable photocatalyst for hydrogen generation," Applied Catalysis B: Environmental, vol.
Transition metals as dopants in photocatalytic materials have some advantages for the higher N[H.sub.3] yields, such as less charge carrier recombination, stronger photocatalyst absorbance, and lower overpotential for the [N.sub.2] reduction.
This is mostly accredited to the effectual separation of charge carriers on the marginal photocatalyst.
Another popular approach to improve the visible light-driven photoactivity is by surface deposition of noble metal nanoparticles on a photocatalyst. Peng et al.
This is compared to using photocatalyst material, as is, with photoreactive electrodes that produce electricity and oxygen through the interaction of sunlight and water, used in artificial photosynthesis (1).