Oxidation absorption of nitric oxide from flue gas using biochar-activated peroxydisulfate technology

Wang, Yan; Ma, Chi; Liu, Yangxian

doi:10.1016/j.fuel.2022.127189

Cited by 29 publications

(4 citation statements)

References 58 publications

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“…Therefore, to reduce the H 2 O 2 consumption cost of the adsorbent modification process, the optimal H 2 O 2 mass concentration of AC in the UV/H 2 O 2 AOP modification process is 9%. Some studies − showed that the increase of the H 2 O 2 concentration could improve the yield of • OH, which can raise the yield of oxygen-containing functional groups on the surface of the adsorbent, thus increasing the mercury removal efficiency of the adsorbent. However, when the H 2 O 2 concentration is excessive, several side reactions will be triggered and then • OH will be consumed.…”

Section: Resultsmentioning

confidence: 99%

Clean Modification of Carbon-Based Materials Using Hydroxyl Radicals and Preliminary Study on Gaseous Elemental Mercury Removal

et al. 2023

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Carbon-based materials (e.g., activated carbon and biomass carbons) are widely used porous materials for adsorbing gaseous Hg0 as a result of the developed porous structure. However, scarcity of active sites on the carbon-based material surface impedes its application. Existing mainstream modification methods (acid/alkaline substances, halides, sulfides, metal oxides, etc.) have deficiencies relating to high energy consumption, extreme working conditions, and/or secondary pollution. In this work, hydroxyl radicals (•OH) produced by the photochemical advanced oxidation process (UV/H2O2 AOP) are used to modify three kinds of carbon-based materials (activated carbon, wheat straw biochar, and corn straw biochar) to form more oxygen-containing functional groups on carbon surfaces, and then these modified carbon-based materials are used to adsorb gaseous Hg0. The interaction between free radicals and the carbon surface, modification mechanism, and adsorption principle of Hg0 are preliminarily explored. The UV/H2O2 AOP can significantly raise the quantity of oxygen-containing functional groups on carbon surfaces, further resulting in the improvement of the Hg0 removal performance. The average Hg0 removal efficiencies of the three modified samples (WSW–UV/H2O2 AOP, MSW–UV/H2O2 AOP, and AC–UV/H2O2 AOP) are up to 90.59, 87.55, and 91.46%, respectively, which are significantly higher than those samples modified by UV or H2O2 alone (a new synergistic effect for modification is discovered). Chemically adsorbed oxygen (O*) and a C–O functional group are proven to play a vital important function in the adsorbing removal process of Hg0 over the tested modified samples.

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Section: Resultsmentioning

confidence: 99%

Clean Modification of Carbon-Based Materials Using Hydroxyl Radicals and Preliminary Study on Gaseous Elemental Mercury Removal

et al. 2023

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“…Nitric oxide (NO) is a major gaseous pollutant, which is mainly derived from vehicle exhaust gas and industrial emissions, including thermal power, chemical industry, and so forth. [1,2] It harms human health and engenders environmental concerns, including the depletion of the ozone layer, the formation of acid rain, and so forth. [3,4] Consequently, there is considerable significance in industrial flue gas denitrification.…”

Section: Introductionmentioning

confidence: 99%

Ozone oxidation of nitric oxide: Promoting effect of phosphorus and inhibitory effect of phosphoric acid

Yang,

Tian,

Ning

et al. 2024

Can J Chem Eng

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This work presents experimental and density functional theory theoretical methods to carry out the catalytic role and reaction mechanism of phosphorus (P4) for liquid phase catalytic oxidation nitric oxide. Meanwhile, it carries out the promoting effect of phosphorus and inhibitory effect of phosphoric acid in the ozone oxidation of nitric oxide. The work reveals the significant involvement of P4 in facilitating the NO catalytic oxidation process by generating O3. Meanwhile, the presence of phosphoric acid (H3PO4) hindered the NO catalytic removal process. The calculation results highlight that P4 promoted the formation of O3 and favoured the oxidation pathway (oxidation‐hydration, NO ➔ NO2 ➔ HNO3). During the liquid‐phase NO catalytic removal process, O2 and NO dissolved into the solution, where O2 exhibited preferential adsorbed on P4, promoting the O3 formation. Subsequently, O3 first oxidized NO to NO2. Then, HNO2 and HNO3 were generated under the hydration reaction of NO2 and H2O. Next, O3 further oxidized the generated HNO2 to HNO3, realizing the complete oxidation of NO. The hydration step of NO2 was identified as the key step in the O3 oxidation processes. Furthermore, the generation of H3PO4 led to the consumption of P4 and inhibited the NO removal process. O3 played the crucial role in liquid phase NO oxidation.

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“…The nitric oxide (NO) produced by a large amount of coal combustion will cause environmental problems such as acid rain, photochemical smog and ozone hole, and then bring serious harm to human health. [1][2][3] 3 Most coal-fired power plants have adopted selective catalytic reduction (SCR) technology to control NO emission. 4,5 However, the main disadvantages of SCR are high investment and operating costs.…”

Section: Introductionmentioning

confidence: 99%

Effective nitric oxide removal from flue gas using UV/H₂O₂ solution catalyzed by Fe₃O₄@FeEDTA

Liu

Zhou

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUND: How to control NO x emission in flue gas economically and efficiently is the focus in the field of energy and environment in the world. In this work, Fe 3 O 4 -magnetic microspheres were employed as the matrix with loading FeEDTA (where EDTA is ethylenediaminetetraacetic acid) to prepare magnetic denitrification absorbent Fe 3 O 4 @FeEDTA. The performance of nitric oxide (NO) removal using Fe 3 O 4 @FeEDTA dispersed in H 2 O 2 solution with ultraviolet (UV) was first investigated. RESULTS:The results showed that Fe 3 O 4 @FeEDTA could be used as a good catalytic oxidation denitrification agent. Increasing H 2 O 2 concentration and O 2 concentration could promote NO absorption. NO removal efficiency increased as pH value increased from 1.5 to 3.0, then decreased when pH continued to increase. The elevated temperature was conducive to NO removal. CO 2 hardly affected the removal of NO, while SO 2 with high concentration was not conducive to NO absorption. In addition, the NO removal mechanism was preliminarily analyzed with X-ray photoelectron spectrometry, electron spin resonance and ion chromatography. The mechanism study indicated that NO removal by Fe 3 O 4 @FeEDTA/H 2 O 2 was a catalysis-complexation-oxidation-absorption process, in which •OH was determined to be the main oxidizing species, and NO captured by Fe(II)EDTA was mainly oxidized by •OH to NO 3 − . CONCLUSION: The catalytic activity of Fe 3 O 4 @FeEDTA could maintain stability during the repeat experiment, realizing the recycling and reuse of Fe 3 O 4 @FeEDTA. The UV-Fe 3 O 4 @FeEDTA-activated H 2 O 2 advanced oxidation technology is suitable for wet denitrification.

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Oxidation absorption of nitric oxide from flue gas using biochar-activated peroxydisulfate technology

Cited by 29 publications

References 58 publications

Clean Modification of Carbon-Based Materials Using Hydroxyl Radicals and Preliminary Study on Gaseous Elemental Mercury Removal

Clean Modification of Carbon-Based Materials Using Hydroxyl Radicals and Preliminary Study on Gaseous Elemental Mercury Removal

Ozone oxidation of nitric oxide: Promoting effect of phosphorus and inhibitory effect of phosphoric acid

Effective nitric oxide removal from flue gas using UV/H₂O₂ solution catalyzed by Fe₃O₄@FeEDTA

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Oxidation absorption of nitric oxide from flue gas using biochar-activated peroxydisulfate technology

Cited by 29 publications

References 58 publications

Clean Modification of Carbon-Based Materials Using Hydroxyl Radicals and Preliminary Study on Gaseous Elemental Mercury Removal

Clean Modification of Carbon-Based Materials Using Hydroxyl Radicals and Preliminary Study on Gaseous Elemental Mercury Removal

Ozone oxidation of nitric oxide: Promoting effect of phosphorus and inhibitory effect of phosphoric acid

Effective nitric oxide removal from flue gas using UV/H2O2 solution catalyzed by Fe3O4@FeEDTA

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Effective nitric oxide removal from flue gas using UV/H₂O₂ solution catalyzed by Fe₃O₄@FeEDTA