Degradation and fate of N-nitrosamines in water by UV photolysis. (September 2016)

• Record Type: Journal Article
• Authors: Afzal, Aqeel; Kang, Jia; Choi, Bo-Mi; Lim, Ho-Jin
• Is Part Of: International journal of greenhouse gas control. Volume 52(2016:Sep.)
• Page Start: 44
• Page End: 51
• Publication Date: 2016-09
• Subjects: Nitrosamine -- Photodegradation -- UV photolysis -- CO2 capture -- Absorption -- Emission; Greenhouse gases -- Environmental aspects -- Periodicals; Air -- Purification -- Technological innovations -- Periodicals; Gaz à effet de serre -- Périodiques; Gaz à effet de serre -- Réduction -- Périodiques; Air -- Purification -- Technological innovations; Greenhouse gases -- Environmental aspects; Periodicals; 363.73874605
• DOI: 10.1016/j.ijggc.2016.06.009
• Languages: English
• ISSNs: 1750-5836

Abstract

Highlights: Photolysis of N -nitrosamines in water was investigated using a small UV reactor. Kinetic data of five N -nitrosamines and their degradation products are reported. Pseudo-first order rate constants of N -nitrosamines were 1.4–2.6 × 10 −2 L/W-min. NO2 − was formed at about two fold higher rate relative to NO3 − formation rate. Loss of N -nitrosamines and byproducts by evaporation was found to be negligible. Abstract: Carcinogenic nitrosamines have received much attention due to their formation in CO2 capture processes and probable emission into the atmosphere. Fortunately, nitrosamines are decomposed by exposure to UV irradiation. This may be an effective strategy to degrade nitrosamines, forming more benign products in the process. In this work, UV photolysis was used to examine the degradation kinetics and fate of nitrosamines (i.e., N -nitrosodiethylamine (NDEA), N -nitrosodibutylamine (NDBA), N -nitrosodimethylamine (NDMA), N -nitrosodiethanolamine (NDELA), and N -nitrosopyrrolidine (NPYR)) in water at 40°C. Nearly all nitrosamines were decomposed within the first 10 min of photodegradation using 4 W, low pressure Hg lamp. Pseudo-first order reaction rate constants were 1.8 × 10 −2, 2.6 × 10 −2, 2.6 × 10 −2, 2.3 × 10 −2, and 1.4 × 10 −2 L/W-min for NDEA, NDBA, NDMA, NDELA, and NPYR, respectively. There was minimal change in total organic carbon (TOC) and total nitrogen (TN), suggesting negligible loss of nitrosamines and photodegradation products by evaporation.