Investigation on the removal of NO from marine exhaust gas using the Na2S2O8-urea redox system in seawater carrier

IF 4.5 3区工程技术 Q2 ENGINEERING, CHEMICAL Frontiers of Chemical Science and Engineering Pub Date : 2025-03-20 DOI:10.1007/s11705-025-2533-6

Xiangwen Xing, Jingxuan Jiang, Jing Liu, Pei Zhao, Lin Cui, Yong Dong

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Abstract

The sodium persulfate (Na₂S₂O₈)-urea system has been proven to be an excellent scrubbing solution for the wet removal of NO. Commonly, seawater is used as a wet carrier in marine applications. To further explore the feasibility of marine denitrification using Na₂S₂O₈-urea system, this study proposed the Na₂S₂O₈-urea-seawater composite redox system for NO removal from the marine exhaust gas. The effects of seawater carrier, reaction temperature, Na₂S₂O₈ concentration, urea concentration, pH value, and NO concentration on NO removal were investigated. Additionally, the NO₃⁻ concentration in the solution was measured. Results showed that the lowest normalized NO concentration was 0.099, with the corresponding mass of NO absorbed per unit volume of solution reaching 0.108 g·L⁻¹. The addition of seawater carrier and incremental reaction temperature, Na₂S₂O₈, and urea concentration promoted the NO removal performance. When the pH value increased within the range of 4–7, the NO removal performance decreased. The NO removal performance increased as the pH value further increased to 8, but decreased again when the pH value increased to 11. An increase in NO concentration was detrimental to NO removal. The Cl⁻, HCO₃⁻, and CO₃²⁻ in seawater could augment the total concentration of active free radicals to improve denitrification performance.

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利用海水载体中的 Na2S2O8-脲氧化还原体系去除海洋废气中的氮氧化物的研究

过硫酸钠(Na2S2O8)-尿素体系已被证明是一种优良的湿法去除NO的洗涤溶液。通常，海水被用作海洋应用中的湿载体。为了进一步探索na2s2o8 -尿素体系用于海洋脱氮的可行性，本研究提出了na2s2o8 -尿素-海水复合氧化还原体系用于海洋废气中NO的去除。考察了海水载体、反应温度、Na2S2O8浓度、尿素浓度、pH值和NO浓度对NO去除率的影响。测定了溶液中NO3−的浓度。结果表明，最低归一化NO浓度为0.099，对应的单位体积溶液吸收NO质量为0.108 g·L−1。海水载体的加入、反应温度的升高、Na2S2O8的增加和尿素浓度的增加均对NO的去除效果有促进作用。pH值在4 ~ 7范围内增大，对NO的去除率降低。当pH值进一步增加到8时，对NO的去除率提高，但当pH值增加到11时，对NO的去除率再次下降。NO浓度的增加不利于NO的去除。海水中的Cl−、HCO3−和CO32−可以增加活性自由基的总浓度，提高反硝化性能。

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来源期刊

Frontiers of Chemical Science and Engineering ENGINEERING, CHEMICAL-

CiteScore

7.60

自引率

6.70%

发文量

868

审稿时长

1 months

期刊介绍： Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.