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- W2563409848 abstract "N-nitrosodimethylamine (NDMA) has aroused extensive concern as a disinfection byproduct due to its high toxicity and elevated concentration levels in water sources. This study investigates the photoreductive decomposition of NDMA by UV/iodide process. The results showed that this process is an effective strategy for the treatment of NDMA with 99.2% NDMA removed within 10 min. The depletion of NDMA by UV/iodide process obeyed pseudo-first-order kinetics with a rate constant (k1) of 0.60 ± 0.03 min−1. Hydrated electrons (eaq−) generated by the UV irradiation of iodide were proven to play a critical role. Dimethylamine (DMA) and nitrite (NO2−) were formed as the main intermediate products, which completely converted to formate (HCOO−), ammonium (NH4+) and nitrogen (N2). Therefore, not only the high efficiencies in NDMA destruction, but the elimination of toxic intermediates make UV/iodide process advantageous. A photoreduction mechanism was proposed: NDMA initially absorbed photons to a photoexcited state, and underwent a cleavage of NNO bond under the attack of eaq−. The solution pH had little impact on NDMA removal. However, alkaline conditions were more favorable for the elimination of DMA and NO2−, thus effectively reducing the secondary pollution." @default.
- W2563409848 created "2017-01-06" @default.
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- W2563409848 date "2017-05-01" @default.
- W2563409848 modified "2023-10-10" @default.
- W2563409848 title "Efficient photoreductive decomposition of N-nitrosodimethylamine by UV/iodide process" @default.
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- W2563409848 doi "https://doi.org/10.1016/j.jhazmat.2016.12.046" @default.
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