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Post-combustion CO capture using amine solvents is the most feasible method of reducing anthropogenic CO emissions, which are the largest contributor to global warming. The formation of carcinogenic N-nitrosamines (i.e., by-products) can hinder the industrial application of this technology. In this study, the effects of direct UV photolysis (N-nitrosamine concentration and amines) and advanced oxidation processes (UV/HO and UV/O) on the three specific N-nitrosamines that are commonplace in amine-based CO capture (i.e., N-nitrosodiethylamine (NDEA), N-nitrosodiethanolamine (NDELA), and N-nitrosomorpholine (NMOR)) were examined. A significant decrease in the photodegradation rate constants was observed for NDEA (1.02 × 10 to 2.94 × 10 min), NDELA (1.52 × 10 to 3.32 × 10 min), and NMOR (1.93 × 10 to 2.20 × 10 min) as their concentrations increased within 1-50 mg/L. This is the first report of a significant increase in the degradation rate constants of N-nitrosamine with an increase in amine concentrations (i.e., monoethanolamine (MEA), diethanolamine (DEA), and morpholine (MOR)) within 10-200 mM. The photodegradation rate constants increased as the molar ratio of HO to N-nitrosamine increased to 20, but then decreased at molar ratios beyond this. O had a negligible effect on the photodegradation of N-nitrosamines. Highlights N-nitrosamines concentration showed an inhibitory effect on its photodegradation. First time positive effect of amines on photodegradation rate constant was observed at low amine levels relevant to washwater solutions. The enhancement in removal efficiency of N-nitrosamines due to HO was observed upto specific molar ratio. O had a negligible effect on UV photodegradation of N-nitrosamines due to its low solubility.
This article was published in the following journal.
Name: Environmental technology
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A branch of medicine concerned with the role of socio-environmental factors in the occurrence, prevention and treatment of disease.