NDLI: Photocatalytic degradation of N-heterocyclic aromatics—effects of number and position of nitrogen atoms in the ring

Content Provider	Springer Nature Link
Author	Kaur, Jasmeet Pal, Bonamali
Copyright Year	2012
Abstract	This study demonstrates the influences of position, number of nitrogen (N) atoms and –C–N– or –N=N– linkage present in the six membered heterocyclic compounds such as pyridine, pyrazine, and pyridazine on their photocatalytic degradation by Au, Ag, and Fe$^{+2}$ deposited TiO$_{2}$ photocatalyst. The photodegradation rate of these heterocyclic compounds follow the order pyridine > pyrazine > pyridazine due to the different extent of hydroxylation and difference in position and number of N atoms in the aromatic moiety. The Au photodeposition significantly improved the TiO$_{2}$ photoactivity as compared to Ag and Fe$^{+2}$ loading. The presence of two N atoms in pyrazine and pyridazine as compared to one N atom in pyridine hamper the nucleophilc attack of OH radicals in comparison to easy hydroxylation of pyridine ring. There is 1 N atom, 4C–C, 1C–N and 1C=N bond in pyridine, 2 N atoms in the 1 and 4 positions, 2C–C, 2C–N bonds and 2C=N bonds in pyrazine, and pyridazine ring contains 2 N atoms in the 1 and 2 positions, 3C–C, 1N–N bond and 2C=N bonds. The bond strength/energy decreases gradually as: C=N– (615 KJ/mol) > –N=N– (418 KJ/mol) > –C–C– (347 KJ/mol) > –C–N– (305 KJ/mol) > –N–N– (163 KJ/mol). As pyridine has 1C–N, 1C=N, and no N–N bond, it photodegrades easily as compared to 1 N–N and 2C=N bonds of pyridazine of lowest photodecomposition rate. The improved photoactivity of Au–TiO$_{2}$ is explained on the basis of its favorable redox potential, work function, and electron-capturing capacity, etc.
Starting Page	3956
Ending Page	3964
Page Count	9
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	20
Issue Number	6
e-ISSN	16147499
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-11-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Au–TiO$_{2}$ photoactivity Pyridine degradation N-heteroaromatics degradation Metal–TiO$_{2}$ photocatalysis Pyrazine photodegradation Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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