Abstract
In this review, three degradation mechanisms, pathways and intermediate products of various organic compounds for photocatalytic degradation by using different photocatalysts are discussed in detail. Three degradation mechanisms are as following: (1) Holes in valence bond and resulting OH˙ radicals generated from holes oxidize the organics, (2) resulting OH˙ radicals and the O2 ˙¯ generated from conduction band electrons oxidize the organics, (3) dye sensitization. The organic matters can be oxidized by several oxidizing species. Under the condition of various light irradiation, photocatalyst can produce electron and hole to form oxidizing species, which have enough oxidization capability to decompose those organic compounds. Most researchers agreed with the mechanisms of electron /O2 or hole oxidizing, which happened in the photodegradation process. However, dye sensitization is also an important mechanism for photodegradation. In addition, photodegradation intermediate products and pathways of 48 organic compounds are illuminated in detail. They are 1,2-diethyl phthalate, 2,3-dichlorophenol, 2-naphthol, 3,3-dimethylbiphenyl-4,4-diamine (o-Tolidine), 3-chloropyridine, 3- nitroacetophenone, methylene blue, trimelitic acid, 4-chlorophenol, pirimiphos-methyl, propanil, molinate, imzazpyr, 4-nitrophenol, methomyl, iodosulfuron methylester, imipramine, chlorfenvinphos, rhodamine B, atrazine, chlorfenapyr, methylparaben, malachite green, C.I. acid red, aniline, 4-chlorophenol, chlorothalonil, dichlofluanid, cyromazine, decabromodiphenyl ether, dipyrone, ethanol, fluroxypyr, hexachlorocyclohexane, maleic acid, fumaric acid, malic acid, metanil yellow, methyl orange, methyl red, methyl-tert-butyl ether, naphthalene, tetrachloroethylene, trichloroethylene, triane, Ph-triole, Ph-triane, dicyclanil. The degradation routes and the intermediate products of these 48 organic compounds will provide scientific researchers with the proof to prepare novel and ideal photocatalysts with perfect crystallinity and photodegradation methods in this field.
Call for Papers in Thematic Issues
Catalytic C-H bond activation as a tool for functionalization of heterocycles
The major topic is the functionalization of heterocycles through catalyzed C-H bond activation. The strategies based on C-H activation not only provide straightforward formation of C-C or C-X bonds but, more importantly, allow for the avoidance of pre-functionalization of one or two of the cross-coupling partners. The beneficial impact of ...read more
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