Determination of nitrate photolysis frequency inside flow tube reactor using NO2 actinometry

LIU Xinran; SHI Xiaowen; CHEN Chen; NING Heshan; PANG Yiyou; HUANG Zixuan; ZHENG Jun

doi:10.3969/j.issn.1673-6141.2024.06.003

Journals >Journal of Atmospheric and Environmental Optics >Volume 19 >Issue 6 >Page 636 > Article

Journal of Atmospheric and Environmental Optics
Vol. 19, Issue 6, 636 (2024)

Determination of nitrate photolysis frequency inside flow tube reactor using NO₂ actinometry

LIU Xinran^1,*, SHI Xiaowen¹, CHEN Chen², NING Heshan²..., PANG Yiyou¹, HUANG Zixuan¹ and ZHENG Jun¹|Show fewer author(s)

Author Affiliations

¹School of Environmental Science and Engineering, Nanjing University of Information Science & Technology,Nanjing 210044, China

²Reading Academy, Nanjing University of Information Science &Technology, Nanjing 210044, China

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DOI: 10.3969/j.issn.1673-6141.2024.06.003 Cite this Article

Xinran LIU, Xiaowen SHI, Chen CHEN, Heshan NING, Yiyou PANG, Zixuan HUANG, Jun ZHENG. Determination of nitrate photolysis frequency inside flow tube reactor using NO₂ actinometry[J]. Journal of Atmospheric and Environmental Optics, 2024, 19(6): 636 Copy Citation Text

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Fig. 1. Schematic diagram of light intensity measurement experiment

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Fig. 2. Schematic diagram of the cross-section of light intensity measurement experimental device

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Fig. 3. Experimental process diagram of NO₂ photolysis

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Fig. 4. Change trend of O₃ concentration simulated by MCM with time

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Gas type

Background concentration

Before

photolysis

After

photolysis

Change in concentration

NO₂/(molecule·cm^-3)

5.90 × 10¹⁰

1.04 × 10¹³

8.60 × 10¹²

1.78 × 10¹²

O₃/(molecule·cm^-3)

2.94 × 10¹⁰

3.46 × 10¹⁰

1.71 × 10¹²

1.68 × 10¹²

Table 1. Concentration changes of each product before and after photolysis reaction

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Reaction	Reaction rate constant/s^-1
$N O_{2} + h v \to N O + O$	6.78 × 10^-3
$O_{2} + O \to O_{3}$	1.34 × 10^-14
$O_{3} \to O_{2} + O$	6 × 10^-5
$N O + O_{3} \to N O_{2} + O_{2}$	1.95 × 10^-14

Table 2. Values of each reaction rate constant in MCM Model

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Research technique	NO₂ photolysis method	Nitrate photometric method
Measuring object	Gaseous NO₂	Aqueous nitrate
Experimental light source	A xenon lamp (CEL-S500, 500 W)	A xenon lamp (CEAULIGHT, 300 W)
Measuring media	Gas	Liquid
Principle of method	NO₂ actinometry method	The hydroxyl radical derived from nitrate photolysis was derived by benzoic acid to produce salicylic acid and its quantification was analyzed
Advantages	Avoid aqueous solution and physical configuration effect	Similar simulation of nitrate photolysis process
Source of error	Uncertain correlation between NO₂and HNO₃	Water weakening effect on light and anisotropy of light on different position

Table 3. Comparison of the two methods for measuring irradiation intensity of light source

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