Kinetics and Modeling of the Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe<sup>2+</sup>

Adewuyi, Yusuf G.; Khan, M. Arif; Sakyi, Nana Y.

doi:10.1021/ie402801b

Cited by 67 publications

(39 citation statements)

References 66 publications

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“…Figures S2a–e, respectively, shows the effects of SO 2 , NO, O 2 , Hg 0 , and CO 2 concentrations on Hg 0 removal efficiency and Hg 0 absorption rate. As shown in Figures S2a–e, SO 2 exhibited a clear inhibition effect on Hg 0 removal because it can also consume

{HSO}_{5}^{-}

S {normalO}_{4}^{-}

·, and ·OH in solutions, which can be explained by the following reactions (20)–(24)

{SO}_{2} + {normalH}_{2} O \leftrightarrow {HSO}_{3}^{-} + {normalH}^{+}

{HSO}_{3}^{-} \leftrightarrow {SO}_{3}^{2 -} + {normalH}^{+}

{SO}_{3}^{2 -} + \cdot OH \to {SO}_{3}^{-} \cdot + {normalH}_{2} O

{SO}_{3}^{2 -} + {SO}_{4}^{-} \cdot \to {SO}_{3}^{-} \cdot + {SO}_{4}^{2 -}

{SO}_{3}^{2 -} + {HSO}_{5}^{-} \to 2 {SO}_{4}^{2 -} + {normalH}^{+}

…”

Section: Resultsmentioning

confidence: 99%

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

Liu

Wang

2018

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com)Several novel oxidation removal processes of elemental mercury (Hg 0 ) from flue gas using combined Fe 2+ /Mn 2+ and heat activated peroxymonosulfate (PMS)/H 2 O 2 solutions in a bubbling reactor were proposed. The operating parameters (e.g., PMS/H 2 O 2 concentration, Fe 2+ /Mn 2+ concentration, solution pH, activation temperature, and Hg 0 /NO/SO 2 /O 2 / CO 2 concentration), mechanism and mass transfer-reaction kinetics of Hg 0 removal were investigated. The results show that heat and Fe 2+ /Mn 2+ have significant synergistic effect for activating PMS and PMS/H 2 O 2 to produce free radicals to oxidize Hg 0 . Hg 0 removal is strongly affected by PMS/H 2 O 2 concentration, Fe 2+ /Mn 2+ concentration, activation temperature, and solution pH. SO − 4 · and ·OH produced from combined heat and Fe 2+ /Mn 2+ activated PMS/H 2 O 2 play a leading role in Hg 0 removal. Under optimized experimental conditions, Hg 0 removal efficiencies reach 100, 94.9, 66.9, and 58.9% in heat/Fe 2+ /PMS/H 2 O 2 , heat/Mn 2+ /PMS/H 2 O 2 , heat/Fe 2+ /PMS, and heat/Mn 2+ /PMS systems, respectively. Hg 0 removal processes in four systems belong to fast reaction and were controlled by mass transfer under optimized experimental conditions.

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{HSO}_{5}^{-}

S {normalO}_{4}^{-}

·, and ·OH in solutions, which can be explained by the following reactions (20)–(24)

{SO}_{2} + {normalH}_{2} O \leftrightarrow {HSO}_{3}^{-} + {normalH}^{+}

{HSO}_{3}^{-} \leftrightarrow {SO}_{3}^{2 -} + {normalH}^{+}

{SO}_{3}^{2 -} + \cdot OH \to {SO}_{3}^{-} \cdot + {normalH}_{2} O

{SO}_{3}^{2 -} + {SO}_{4}^{-} \cdot \to {SO}_{3}^{-} \cdot + {SO}_{4}^{2 -}

{SO}_{3}^{2 -} + {HSO}_{5}^{-} \to 2 {SO}_{4}^{2 -} + {normalH}^{+}

…”

Section: Resultsmentioning

confidence: 99%

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

Liu

Wang

2018

AIChE Journal

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“…The effects of solution pH on removal of Hg 0 can be attributed to the following reasons. The results show that SO 4 − · can react with OH -to produce ·OH by the following reaction 17 14,15,17. …”

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confidence: 98%

Removal of Elemental Mercury from Flue Gas by Thermally Activated Ammonium Persulfate in A Bubble Column Reactor

Liu

Wang

2014

Environ. Sci. Technol.

158

132

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In this article, a novel technique on removal of elemental mercury (Hg(0)) from flue gas by thermally activated ammonium persulfate ((NH4)(2)S(2)O(8)) has been developed for the first time. Some experiments were carried out in a bubble column reactor to evaluate the effects of process parameters on Hg(0) removal. The mechanism and kinetics of Hg(0) removal are also studied. The results show that the parameters, (NH4)(2)S(2)O(8) concentration, activation temperature and solution pH, have significant impacts on Hg(0) removal. The parameters, Hg(0), SO2 and NO concentration, only have small effects on Hg(0) removal. Hg(0) is removed by oxidations of (NH4)(2)S(2)O(8), sulfate and hydroxyl free radicals. When (NH4)(2)S(2)O(8) concentration is more than 0.1 mol/L and solution pH is lower than 9.71, Hg(0) removal by thermally activated (NH4)(2)S(2)O(8) meets a pseudo-first-order fast reaction with respect to Hg(0). However, when (NH4)(2)S(2)O(8) concentration is less than 0.1 mol/L or solution pH is higher than 9.71, the removal process meets a moderate speed reaction with respect to Hg(0). The above results indicate that this technique is a feasible method for emission control of Hg(0) from flue gas.

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“…[20] In 2013, Adewuyi °C) compared to a prior study involving temperature-only activation. [5,21] However, in these studies, initial solution pH was kept between 3.0 and 3.5 (± 0.1) to prevent Fe 2+ oxidation to Fe 3+ and subsequent precipitation as Fe(OH) 3 . The thermal and Fe 2+ ion activation of the persulfate anion leads to the production of the sulfate radicals (SO 4 •− ), which is responsible for the production of OH • that acts as the main oxidant for the conversion of NO in the aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

“…The thermal and Fe 2+ ion activation of the persulfate anion leads to the production of the sulfate radicals (SO 4 •− ), which is responsible for the production of OH • that acts as the main oxidant for the conversion of NO in the aqueous solution. [5,6,[21][22][23] The following major pathways have been proposed: Finally, the respective concentration values were multiplied by their respective dilution factors, and then averaged to determine the concentration of a particular sample. The concentration profiles of the species were then obtained.…”

Section: Introductionmentioning

confidence: 99%

Nitric oxide removal by combined persulfate and ferrous–EDTA reaction systems

Adewuyi

Khan

2015

Chemical Engineering Journal

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Nitric oxide (NO) removal from simulated flue gas is investigated using combined aqueous persulfate (Na 2 S 2 O 8 ) and ferrous ethylenediaminetetraacetate (Fe 2+ -EDTA) systems. The results at 23-70 °C showed significant improvement in NO removal using the optimally obtained molar ratio of 1:1 for the Fe 2+ and EDTA compared with temperature-only and combined temperatureFe 2+ activated persulfate systems with 0.1 M Na 2 S 2 O 8 and 0.01 M Fe 2+ in the absence of EDTA.Almost 100% NO conversion can be achieved at 70 °C (flue gas treatment inlet temperature generally at 50-70 °C) compared to temperature and Fe 2+ -activated persulfate systems which require ≥ 90 °C for such high removal efficiency. The percentage increases in NO removal were dependent on temperature, 25-30% and 5-10% at the lower (< 40 °C) and higher (> 40 °C) temperatures, respectively. A very high concentration of Fe II -EDTA appears to negatively impact NO removal. However, this process operates at an optimal NO removal pH of near neutral (~6.5) with efficiency decreasing at very low or high pH. This should reduce the use of auxiliary chemical for pH adjustment and help mitigate the important technological hurdle of undesired ferric product formation associated with Fe 2+ -only activated persulfate and other Fenton-like systems at pH (>3.5). The material balance on iron species (Fe 2+ , Fe 3+ and Fe 2+ -EDTA) was determined to better understand the chemistry of persulfate with Fe 2+ -EDTA for NO removal.The results demonstrate the feasibility of near complete NO removal at relatively lower temperatures (with the advantage of reduced energy usage), and sustained longtime high NO absorption capability.

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Kinetics and Modeling of the Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe²⁺

Cited by 67 publications

References 66 publications

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

Removal of Elemental Mercury from Flue Gas by Thermally Activated Ammonium Persulfate in A Bubble Column Reactor

Nitric oxide removal by combined persulfate and ferrous–EDTA reaction systems

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Kinetics and Modeling of the Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe2+

Cited by 67 publications

References 66 publications

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H2O2 Solutions

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H2O2 Solutions

Removal of Elemental Mercury from Flue Gas by Thermally Activated Ammonium Persulfate in A Bubble Column Reactor

Nitric oxide removal by combined persulfate and ferrous–EDTA reaction systems

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Kinetics and Modeling of the Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe²⁺

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H₂O₂ Solutions