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Photochemical removal of NO2 in air at atmospheric pressure using side-on type 172-nm Xe2 excimer lamp

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Abstract

The photochemical removal of NO2 in air (1–20% O2) was studied using a side-on type 172-nm Xe2 excimer lamp. The removal rate of NO2 using the side-on lamp (SL), 37.5 min−1, was faster than that using a head-on lamp (HL), 5.4 min−1, with the same input power of 20 W by a factor of 6.9. The energy efficiency for removal of NO2 using the SL was 3.2 g/kWh, which was 12 times higher than that using the HL. Significant enhancement of the removal rate and the energy efficiency using the SL was attributed to a significant increase in the irradiation volume because of a wider irradiation window. Under the SL irradiation, HNO3 was a major final product that differed from N2O5 obtained under the HL irradiation. To obtain the information related to the conversion mechanism of NO2 to HNO3 under 172-nm photolysis in air, computer simulation of the reaction processes was conducted. Results show that the OH + NO2 reaction is a major pathway for the formation of HNO3 in the SL, where OH radicals are formed by 172-nm photolysis of H2O.

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Scheme 1

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Abbreviations

HL:

Head-on lamp

SL:

Side-on lamp

FTIR:

Fourier transform infrared

VUV:

Vacuum ultraviolet

TNS:

Taiyo Nippon Sanso

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Acknowledgements

The authors wish to thank all who assisted in conducting this work.

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Correspondence to M. Tsuji.

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Editorial responsibility: M. Abbaspour.

Appendices

Appendix 1

See Table 2.

Table 2 Performance of photolysis chamber using side-on or head-on lamp

Appendix 2

See Fig. 6.

Fig. 6
figure 6

Dependence of light transmission rate on the distance from light source in air (O2 20%)

Appendix 3

See Table 3.

Table 3 Parameters used for the calculations of removal of NO2

Appendix 4

See Table 4.

Table 4 Reactions and their rate constants used for kinetic model simulation

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Tsuji, M., Kawahara, T., Uto, K. et al. Photochemical removal of NO2 in air at atmospheric pressure using side-on type 172-nm Xe2 excimer lamp. Int. J. Environ. Sci. Technol. 16, 5685–5694 (2019). https://doi.org/10.1007/s13762-018-2131-y

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  • DOI: https://doi.org/10.1007/s13762-018-2131-y

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