Simultaneous absorption of SO2 and NO from flue gas using ultrasound/Fe2+/heat coactivated persulfate system

Simultaneous absorption of SO2 and NO from flue gas using ultrasound/Fe2+/heat coactivated persulfate system

•US/Fe2+/heat activated persulfate system was used for SO2 and NO removal.•US enhances NO removal by enhancement of mass transfer and chemical reaction.•US, Fe2+ and heat have a synergistic effect for producing free radicals.•·OH and SO4−· play a leading role for NO oxidation. A novel process on sim...

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Veröffentlicht in:Journal of hazardous materials 2018-01, Vol.342, p.326-334
Hauptverfasser: Liu, Yangxian, Liu, Ziyang, Wang, Yan, Yin, Yanshan, Pan, Jianfeng, Zhang, Jun, Wang, Qian
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Sprache:eng
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Activated persulfate
Hydroxyl radical (·OH)
Simultaneous absorption of SO2 and NO
Sulfate radical (SO4−·)
Ultrasound (US)/Fe2+/heat
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container_end_page 334
container_issue
container_start_page 326
container_title Journal of hazardous materials
container_volume 342
creator Liu, Yangxian
Liu, Ziyang
Wang, Yan
Yin, Yanshan
Pan, Jianfeng
Zhang, Jun
Wang, Qian
description •US/Fe2+/heat activated persulfate system was used for SO2 and NO removal.•US enhances NO removal by enhancement of mass transfer and chemical reaction.•US, Fe2+ and heat have a synergistic effect for producing free radicals.•·OH and SO4−· play a leading role for NO oxidation. A novel process on simultaneous absorption of SO2 and NO from flue gas using ultrasound (US)/Fe2+/heat coactivated persulfate system was proposed. The influencing factors, active species, products and mechanism of SO2 and NO removal were investigated. The results indicate that US enhances NO removal due to enhancement of mass transfer and chemical reaction. US of 28kHz is more effective than that of 40kHz. NO removal efficiency increases with increasing persulfate concentration, ultrasonic power density and Fe2+ concentration (at high persulfate concentration). Solution pH, solution temperature and Fe2+ concentration (at low persulfate concentration) have double effect on NO removal. SO2 is completely removed in most of tested removal systems, except for using water absorption. US, Fe2+ and heat have a synergistic effect for activating persulfate to produce free radicals, and US/Fe2+/heat coactivated persulfate system achieves the highest NO removal efficiency. ·OH and SO4−· play a leading role for NO oxidation, and persulfate only plays a complementary role for NO oxidation.
doi_str_mv 10.1016/j.jhazmat.2017.08.042
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A novel process on simultaneous absorption of SO2 and NO from flue gas using ultrasound (US)/Fe2+/heat coactivated persulfate system was proposed. The influencing factors, active species, products and mechanism of SO2 and NO removal were investigated. The results indicate that US enhances NO removal due to enhancement of mass transfer and chemical reaction. US of 28kHz is more effective than that of 40kHz. NO removal efficiency increases with increasing persulfate concentration, ultrasonic power density and Fe2+ concentration (at high persulfate concentration). Solution pH, solution temperature and Fe2+ concentration (at low persulfate concentration) have double effect on NO removal. SO2 is completely removed in most of tested removal systems, except for using water absorption. 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A novel process on simultaneous absorption of SO2 and NO from flue gas using ultrasound (US)/Fe2+/heat coactivated persulfate system was proposed. The influencing factors, active species, products and mechanism of SO2 and NO removal were investigated. The results indicate that US enhances NO removal due to enhancement of mass transfer and chemical reaction. US of 28kHz is more effective than that of 40kHz. NO removal efficiency increases with increasing persulfate concentration, ultrasonic power density and Fe2+ concentration (at high persulfate concentration). Solution pH, solution temperature and Fe2+ concentration (at low persulfate concentration) have double effect on NO removal. SO2 is completely removed in most of tested removal systems, except for using water absorption. US, Fe2+ and heat have a synergistic effect for activating persulfate to produce free radicals, and US/Fe2+/heat coactivated persulfate system achieves the highest NO removal efficiency. ·OH and SO4−· play a leading role for NO oxidation, and persulfate only plays a complementary role for NO oxidation.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.jhazmat.2017.08.042</doi><tpages>9</tpages></addata></record>
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source ScienceDirect Journals (5 years ago - present)
subjects Activated persulfate
Hydroxyl radical (·OH)
Simultaneous absorption of SO2 and NO
Sulfate radical (SO4−·)
Ultrasound (US)/Fe2+/heat
title Simultaneous absorption of SO2 and NO from flue gas using ultrasound/Fe2+/heat coactivated persulfate system
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