Effects of amines on the formation and photodegradation of DCNM under UV/chlorine disinfection
| Autor: | Bohui Xu, Xueying Liao, Jiaxin Shen, Lin Deng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Radical
0208 environmental biotechnology chemistry.chemical_element lcsh:Medicine 02 engineering and technology 010501 environmental sciences 01 natural sciences Article Environmental impact chemistry.chemical_compound Chlorine PolyDADMAC Photodegradation lcsh:Science Dimethylamine 0105 earth and related environmental sciences Multidisciplinary Methylamine lcsh:R 020801 environmental engineering Environmental sciences Light intensity chemistry Environmental chemistry Amine gas treating lcsh:Q Nuclear chemistry |
| Zdroj: | Scientific Reports Scientific Reports, Vol 10, Iss 1, Pp 1-13 (2020) |
| ISSN: | 2045-2322 |
| Popis: | Investigations were conducted to examine the effects of amine type and initial concentration, free chlorine concentration, UV light intensity, pH and tert-butyl alcohol (TBA) on the formation of dichloronitromethane (DCNM) under UV/chlorine. Methylamine (MA), dimethylamine (DMA) and poly-dimethyl diallyl ammonium chloride (PolyDADMAC) were selected as the amine precursors of DCNM. And the reaction products of amines were explored through observing the contents of various nitrogen under UV/chlorine. Experimental results indicated that the higher of the intensity of UV light, the concentration of amines and free chlorine, the greater of the amount of DCNM formation; the amine substance with simple structure is more likely oxidized to form DCNM, so the potential of MA to form DCNM is the largest among three amines; the formation of DCNM decreased with increasing pH from 6.0 to 8.0; due to adding TBA into the reaction solution, halogen and hydroxyl radicals were restrained which resulted the DCNM formation decreased. In the reaction process, the formation of DCNM from amines increased at the beginning, then decreased and almost disappeared due to photodegradation. During the formation and photodegradation of DCNM, the dissolved organic nitrogen could be transformed into the ammonia-nitrogen (NH3-N) and nitrate-nitrogen (NO3−-N). |
| Databáze: | OpenAIRE |
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