Factors influencing the photodegradation of <italic>N</italic>-nitrosodimethylamine in drinking water

doi:10.1007/S11783-009-0013-8

Front Envir Sci Eng Chin

2009, Vol. 3

Issue (1) : 91-97 https://doi.org/10.1007/S11783-009-0013-8

RESEARCH ARTICLE

Factors influencing the photodegradation of N-nitrosodimethylamine in drinking water

Bingbing XU^1,2, Zhonglin CHEN¹(

), Fei QI³, Jimin SHEN¹, Fengchang WU²

1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; 2. State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 3. College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China

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Abstract

In order to provide basic data for practical application,photodegradation experiment of N-nitrosodimethylamine (NDMA) in aqueous solution was carried out with a low-pressure Hg lamp. Effects of the initial concentration of NDMA, solution pH, dissolved oxygen, and the presence of humic acid on NDMA photodegradation were investigated. NDMA at various initial concentrations selected in this study was almost completely photodegraded by UV irradiation within 20 min, except that at 1.07 mmol/L, NDMA could be photodegraded almost completely in the acidic and neutral solutions, while the removal efficiency decreased remarkably in the alkaline solution. Dissolved oxygen enhanced the NDMA photodegradation, and the presence of humic acid inhibited the degradation of NDMA. Depending on the initial concentration of NDMA, NDMA photodegradation by UV obeyed the pseudo-first-order kinetics. Dimethylamine, nitrite, and nitrate were detected as the photodegradation products of NDMA. ¹O₂ was found to be the reactive oxygen species present in the NDMA photodegradation process by UV, based on the inhibiting experiments using tert-butanol and sodium azide.

Keywords N-nitrosodimethylamine (NDMA) ultraviolet irradiation degradation kinetic dimethylamine photodegradation product

Corresponding Author(s): CHEN Zhonglin,Email:zhonglinchen@hit.edu.cn

Issue Date: 05 March 2009

Cite this article:

Bingbing XU,Zhonglin CHEN,Fei QI, et al. Factors influencing the photodegradation of N-nitrosodimethylamine in drinking water[J]. Front Envir Sci Eng Chin, 2009, 3(1): 91-97.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/S11783-009-0013-8
https://academic.hep.com.cn/fese/EN/Y2009/V3/I1/91

Fig.1 Schematic diagram of UV direct photolysis of NDMA

Fig.2 Effect of initial concentration of NDMA () on its photodegradation. reaction conditions: solution pH= 6.0; irradiation intensity= 1000 μW·cm

Fig.3 Effect of solution pH on NDMA photodegradation. reaction conditions: [NDMA]= 0.54 mmol·L; irradiation intensity= 1000 μW·cm

Fig.4 UV absorption of NDMA at various solution pH

Fig.5 Effect of dissolved oxygen on NDMA photodegradation. reaction conditions: [NDMA] = 0.54 mmol·L; solution pH= 6.0; irradiation intensity= 1000 μW·cm

Fig.6 Effect of humic acid on NDMA photodegradation. reaction conditions: [NDMA] = 0.33 mmol·L; solution pH= 6.0; irradiation intensity= 1000 μW·cm

Fig.7 Kinetics of NDMA photodegradation by UV. reaction conditions: solution pH= 6.0; irradiation intensity= 1000 μW·cm

Tab.1 Kinetic parameters of NDMA photodegradation by UV

Fig.8 Products of NDMA photodegradation by UV. reaction conditions: [NDMA] = 0.54 mmol·L; solution pH= 6.0 ; irradiation intensity= 1000 μW·cm

Fig.9 Conversion efficiency of NDMA photodegradation products under various pH values. reaction conditions: [NDMA] = 0.54 mmol·L; solution pH= 6.0; irradiation intensity= 1000 μW·cm

Fig.10 Effects of tert-butanol and NaN on NDMA photodegradation. reaction conditions: [NDMA] = 0.54 mmol·L; solution pH= 6.0; irradiation intensity= 1000 μW·cm

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