Photocatalytic and photolytic transformation of Chloramben (cas 133-90-4) in aqueous solutions

Add time:10/01/2019    Source:infona.pl

The photocatalytic degradation of Chloramben (cas 133-90-4) (3-amino-2,5-dichlorobenzoic acid) was investigated in aqueous solutions containing TiO 2 suspensions under irradiation with simulated solar light. The primary degradation of the herbicide, the mineralisation of the organic carbon to CO 2 and the formation of chloride ion from organic chlorine proved to be relatively fast, whereas the conversion of organic nitrogen into ammonium and nitrate ions took place only at delayed irradiation times. Photolytic degradation processes proved also to be active in the examined time interval, but they were far from producing complete mineralisation, leaving considerable amounts of residual organic products. Various aromatic intermediates that originated from chloramben during the photocatalytic treatment were detected and identified using GC-MS. Similarly, the main aromatic products arising from photolytic decomposition were also identified, and, in turn, they proved to undergo complete mineralisation upon addition of TiO 2 .

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