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Photo-induced transformation of methylguanidine derivatives on titanium dioxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
49033 46541 2006 7 PDF Available
Title
Photo-induced transformation of methylguanidine derivatives on titanium dioxide
Abstract

The photo-induced transformation of methyl and methyl acetic acid guanidine derivatives, which are the decomposition products of several pollutants, was studied adopting titanium dioxide as photocatalyst. The in-depth investigation of the overall process involved studying the evolution of intermediate compounds, the fate of organic nitrogen and the rate (and extent) of carbon mineralization. Intermediate products were identified with an HPLC/tandem MS instrument, thus enabling a transformation mechanism applicable to methyl-guanidinic derivatives to be defined. The derivatives are chiefly transformed through a combination of reductive and oxidative processes. Photocatalytically assisted hydrolysis, through sequential reactions involving OH/e−/H+, induces a demethylation process that, in all cases, leads to the formation of guanidine, then (very slowly) to its mineralization.Similarly, also with creatine and creatinine the main transformation pathway proceeds through a photocatalytically assisted hydrolysis that leads to the formation of 2-imino-imidazole-4-one (from creatinine) and guanidine acetic acid and methyl guanidine (from creatine). Guanidine is the ultimate intermediate compound recognized in these cases, too.The fate of nitrogen was also evaluated in all cases. The organic nitrogen is mainly released as nitrate ions, with [NH4+]:[NO3−] ratios ranging from 1:2 for creatine to 1:8 with methylguanidine.

Keywords
Methyl-guanidine; Photocatalysis; TiO2; Creatine; Creatinine; Intermediates; Fate of nitrogen
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 63, Issues 1–2, 22 March 2006, Pages 124–130
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
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