ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Dimethylamine oxidation by homogenic (Fe⁺² and UV) and heterogenic (CuO) activated peroxydisulfate

I. Rykowska, P. Andrzejewski, R. Wolski, and A. Dabrowska

Faculty of Chemistry, Adam Mickiewicz University, Poznan, Poland

E-mail: agatadab@amu.edu.pl

Received: 27 February 2020  Accepted: 11 September 2020

Abstract:

Oxidation of water or wastewaters with classical oxidants such as chloramine, chlorine dioxide, ozone or permanganate may lead to formation of carcinogenic N-nitrosodimethylamine (NDMA), when dimethylamine (DMA) is present as water pollution. This study shows that peroxydisulfate (PDS) could be considered as relatively ‘safe’ oxidant as PDS partly destroys dimethylamine without formation of NDMA. Prior to use, peroxydisulfate was activated. Metal ions Fe⁺², UV radiation and metal oxides CuO were compared as activator compounds to understand their efficiency in PDS systems (radical and non-radical) for oxidation of DMA. The amount of nitrate formed as the result of nitrogen oxidation, as well as formaldehyde (FA), formed as the result of methyl groups oxidation, was monitored as an indicator of DMA degradation. Application studies conducted on natural water showed that activated peroxydisulfate can effectively protect against the undesirable NDMA formation.

Keywords: Dimethylamine; Formaldehyde; Nitrate; N-nitrosodimethylamine; Oxidation; Peroxydisulfate

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01354-4

Chemical Papers 75 (3) 993–1003 (2021)