photocatalyst


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photocatalyst

[‚fōd·ō′kad·əl·ist]
(physical chemistry)
A light-absorbing substance which, when added to a reaction, facilitates the reaction, while remaining unchanged at the end of the reaction.
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In this method the H2O2 decompose to highly reactive hydroxyl radicals (HO*) which decolorized the organic dyes in the presence of heterogeneous photocatalyst. The ferromagnetic material, iron-based nano catalyst is the emerging application in AOP that is widely examined due to its successful use in removing a broad range of common ecological organic and inorganic pollutants [16-19].
Titanium dioxide (TiO2) and cadmium sulfide (CdS) are two kinds of widely studied semiconductor photocatalyst. TiO2 is characteristic of low toxicity, high catalytic activity, no secondary pollution and high stability [17].
In all spectra it was possible to observe the occurrence of two relatively wide bands at 1636 [cm.sup.-1] and 3360 [cm.sup.-1] related to the vibration of O-H from H2O molecules respectively chemisorbed and physisorbed on the surface of the photocatalyst [34, 35].
VOC removal efficiency strongly depends on the properties of photocatalyst (e.g.
Some photocatalysts and solar cells are based on a technology that involves molecules containing metals, known as metal complexes.
The portable photocatalyst deodoriser debuting at the exhibition uses photocatalytic technology, i e, combining UV sterilisation and chemical technology, which not only can neutralise odour indoor quickly and effectively, but also kills all types of bacteria, viruses, fungus and remove air pollutants, including methanol.
The goal of this research was to synthesize and characterize Ti[O.sub.2]-based photocatalytic powders modified with Nb in two ways: into the crystalline structure [Nb.sup.4+] (by chemical synthesis Pechini) and upon the surface [Nb.sup.0] (through sputtering deposition), as well as aiming at improving the photocatalyst properties by combining these two methods (the novelty).
Although Ti[O.sub.2] has been the preferred and therefore most assessed photocatalyst by the scientific community, the manuscripts included in this special issue show that there is still enough room for improvement taking as base such a material.
Therefore, the photogenerated electrons first transfer to CNF and then are trapped by [O.sub.2] and [H.sub.2]O at the surface of photocatalyst or solution to form the active species such as [O.sup.2-].
[44] supported [Fe.sub.2][O.sub.3]-hybridized Ti[O.sub.2] on [Al.sub.2][O.sub.3] as photocatalyst which was applied in gas-solid fluidized bed reactors to improve N[H.sub.3] yields because of the influence of iron ions on the Ti[O.sub.2] crystalline [45].
A photocatalyst with a high surface area is likely to absorb more Cr(VI) and react more rapidly; [N.sub.2] adsorption-desorption isotherms of [Fe.sub.2][O.sub.3] are depicted.
To improve their visible light-driven photocatalytic activities, approaches are adopted, mainly including doping and preparation of plasmonic photocatalyst [12, 13].