TY - JOUR
T1 - Decomposition of N, N-diethyl-m-toluamide by water plasma with mist generation
AU - Kim, Soon Ho
AU - Tanaka, Manabu
AU - Lee, Myeong Hoon
AU - Watanabe, Takayuki
N1 - Funding Information:
This work was supported by the ( Japan Society for the Promotion of Science ) JSPS KAKENHI (Grant No. JP19H01887 , JP18H03856 ). We also thank the Center of Advanced Instrumental Analysis, Kyushu University for assistance with the ESI-MS measurements.
Publisher Copyright:
© 2022 Elsevier Ltd.
PY - 2022/6
Y1 - 2022/6
N2 - The study presents the decomposition of a high concentration of N, N-diethyl-m-toluamide (DEET) by water plasma with mist generation at atmosphere pressure. The water mist generated from the DEET solution was used for the plasma. The relationship between operational arc currents and DEET decomposition was discussed in detail. The results showed that the decomposition rate of the DEET was improved as an increase of arc current at torch powers of 1.07-1.39 kW. Major effluent gases were H2, CO2, CO, and N2. The total organic carbon (TOC) for the effluent liquid was reduced up to 98%. The H, O, and OH as reactive species generated by the dissociation of water molecules were verified, and the plasma temperatures were estimated at over 8000 K. A possible decomposition pathway was deduced based on the identification of intermediate products by optical emission spectroscopy (OES), UV-visible (UV-vis) spectroscopy, and quadrupole time of flight mass spectrometer (QTOF-MS). Electron dissociation and hydroxylation were found to play important roles in ring opening and initial cleavage of the alkyl chains at the beginning of decomposition. The water plasma shows a robust driving force for processing organic wastes as an alternative green technology.
AB - The study presents the decomposition of a high concentration of N, N-diethyl-m-toluamide (DEET) by water plasma with mist generation at atmosphere pressure. The water mist generated from the DEET solution was used for the plasma. The relationship between operational arc currents and DEET decomposition was discussed in detail. The results showed that the decomposition rate of the DEET was improved as an increase of arc current at torch powers of 1.07-1.39 kW. Major effluent gases were H2, CO2, CO, and N2. The total organic carbon (TOC) for the effluent liquid was reduced up to 98%. The H, O, and OH as reactive species generated by the dissociation of water molecules were verified, and the plasma temperatures were estimated at over 8000 K. A possible decomposition pathway was deduced based on the identification of intermediate products by optical emission spectroscopy (OES), UV-visible (UV-vis) spectroscopy, and quadrupole time of flight mass spectrometer (QTOF-MS). Electron dissociation and hydroxylation were found to play important roles in ring opening and initial cleavage of the alkyl chains at the beginning of decomposition. The water plasma shows a robust driving force for processing organic wastes as an alternative green technology.
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U2 - 10.1016/j.jece.2022.107817
DO - 10.1016/j.jece.2022.107817
M3 - Article
AN - SCOPUS:85130519570
SN - 2213-3437
VL - 10
JO - Journal of Environmental Chemical Engineering
JF - Journal of Environmental Chemical Engineering
IS - 3
M1 - 107817
ER -