Magnetic γ-Fe2O3-Loaded Attapulgite Sorbent for Hg0 Removal in Coal-Fired Flue Gas

Dong, Lu; Huang, Yaji; Chen, Hao; Liu, Lingqin; Liu, Changqi; Xu, Ligang; Zha, Jianrui; Wang, Yongxing; Líu, Hao

doi:10.1021/acs.energyfuels.9b01136

Cited by 33 publications

(24 citation statements)

References 66 publications

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“…Then, the consumed active species (such as chemisorption oxygen and lattice oxygen) could be regenerated and replenished by adding oxygen. Dong et al 118 also achieved similar results on the effect of O 2 over the 1Fe1ATT adsorbent. They found that the presence of O 2 could continuously replenish active oxygen on metal oxides, thus promoting the oxidation of Hg 0 .…”

Section: Effects Of Flue Gas Components On Hgmentioning

confidence: 57%

“…As a result of its unique microporous structure, low prices, good activity, and chemical adsorption, clay materials are also recognized as one of the ideal supports for catalysts. 117 Dong et al 118 developed a magnetic clay-based adsorbent by adding γ-Fe 2 O 3 to attapulgite (ATT, a natural mineral clay). The preparation process of the magnetic clay-based adsorbent is displayed in Figure 13.…”

Section: Hg 0 Removal Performance Of Magnetic Adsorbentsmentioning

confidence: 99%

“…The scholars believed that the promotion effect of NO might be due to the fact that NO could be converted by chemisorbed oxygen and lattice oxygen on the adsorbent to generate new active substances (such as NO 3− , NO + , and NO 2 ), thus enhancing the capture of Hg 0 . 105,118 However, some other scholars suggested that the presence of NO was not conducive to the capture of Hg 0 . Zeng et al 56 studied the effect of NO on Hg 0 capture over the FM-5 adsorbent, and their results suggested that the Hg 0 removal ability was greatly inhibited when the NO concentration increased from 100 to 500 ppm.…”

Section: Effects Of Nomentioning

confidence: 99%

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Review on Magnetic Adsorbents for Removal of Elemental Mercury from Flue Gas

2020

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Mercury in flue gas has been identified to be one of the most harmful environmental pollutants to humans and other organisms as a result of its bioaccumulation, volatility, persistence, high toxicity, etc. Although many adsorption removal technologies have been developed to control mercury emissions, they are difficult to be used in practical industrial applications as a result of their own technology and cost constraints. Thus, more efficient and low-cost mercury pollution control technologies need to be further developed. Because of its good adsorption performance, easy separation and recovery, low toxicity, and high chemical stability, magnetic adsorbents are considered as one of the most promising adsorbents for controlling mercury emissions in flue gas. This review mainly analyzes the latest developments and research progress in the removal of Hg 0 in flue gas by magnetic adsorbents, especially magnetic iron-based adsorbents, magnetic carbon-based adsorbents, magnetic fly-ash-based adsorbents, and magnetic mineral-based adsorbents. The Hg 0 removal performance, mechanism, and kinetics of magnetic adsorbents are reviewed. The effects of flue gas compositions (such as O 2 , NO, SO 2 , CO 2 , H 2 O, etc.) on Hg 0 capture performance are summarized. The merits and drawbacks of magnetic adsorbents for capturing Hg 0 and the future development directions are also discussed. In comparison to other adsorbents, magnetic adsorbents can be easily separated from fly ash as a result of their better magnetization characteristics. It was found that the MoSe x (inter)Fe 3 O 4 adsorbent showed good Hg 0 removal performance, and the capacity of Hg 0 removal was up to 135 mg/g. In addition, considering the entire life cycle, magnetic adsorbents are more attractive in costs than other common adsorbents. The development and design of the magnetic adsorbents, which possess high adsorption efficiency, simple and efficient separability, green sustainability, good regeneration ability, and low production cost, are considered to be one of the research hotspots in the future. The purpose of this work is to provide theoretical guidance for the further development of magnetic adsorbents in the field of mercury control.

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Section: Effects Of Flue Gas Components On Hgmentioning

confidence: 57%

Section: Hg 0 Removal Performance Of Magnetic Adsorbentsmentioning

confidence: 99%

Section: Effects Of Nomentioning

confidence: 99%

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Review on Magnetic Adsorbents for Removal of Elemental Mercury from Flue Gas

2020

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“…In order to develop cheaper adsorbents, researchers have focused on natural minerals (Ding et al 2012, Shao et al 2016). Among a variety of natural minerals, attapulgite (ATP) has attracted much attention due to its nano-scale rod-like structure, excellent thermal stability and large surface area (Liu et al 2017 Although these adsorbents show good mercury removal capacity and regeneration performance, the mercury removal e ciency of adsorbents reduces greatly under SO 2 long-term operation, which limits their further development and application (Dong et al 2019). In order to alleviate above negative effect, we simultaneously loaded Mn-Cu into magnetic ATP by ultrasonic impregnation, and evaluated Hg 0 removal e ciency under different conditions.…”

Section: Introductionmentioning

confidence: 99%

Removal of Elemental Mercury from Flue Gas using the Magnetic Attapulgite by Mn-Cu Oxides Modification

Long

et al. 2021

Preprint

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Mercury pollution has become one of the most concerned environmental issues in the world because of its high toxicity, non-degradability and bioaccumulation. Attapulgite adsorbents modified by magnetic manganese-copper (MnxCuy-MATP) were fabricated by co-precipitation and ultrasonic impregnation method,aiming at removing Hg0 from coal-fired flue gas. BET, SEM, XRD, VSM and XPS were used to systematically explore the physical and chemical properties of the adsorbents, the effects of manganese and copper additions, reaction temperature and various components in the flue gas on the efficiency of Hg0 removal were investigated. Mn8Cu5-MATP exhibited the optimal properties, and excessive copper loadings led to the aggregation of the active components. The efficiency of mercury removal can be effectively improved by NO and HCl regardless of the absence and presence of O2, because the NO+, NO3, NO2 and Cl* produced during the reaction can promote the adsorption and oxidation of Hg0. SO2 and H2O inhibited the oxidation of Hg0 because of the competitive adsorption at the active sites, while a large amount of sulfite and sulfate were formed to block the pores. However, the introduction of copper caused the sample to obtain SO2 resistance, which resulted in a mercury removal efficiency of 84.3% even under 1500 ppm SO2. In addition, after 5 cycles of adsorption and regeneration, Mn8Cu5-MATP can still maintain excellent Hg0 removal ability. The fabricated adsorbent can save the actual production cost and effectively improve the mercury removal efficiency in sulfur-containing flue gas.

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“…In order to develop cheaper adsorbents, researchers have focused on natural minerals (Ding et al 2012, Shao et al 2016). Among a variety of natural minerals, attapulgite (ATP) has attracted much attention due to its nano-scale rod-like structure, excellent thermal stability and large surface area (Liu et Although these adsorbents show good mercury removal capacity and regeneration performance, the mercury removal e ciency of adsorbents reduces greatly under SO 2 long-term operation, which limits their further development and application (Dong et al 2019). In order to alleviate above negative effect, we simultaneously loaded Mn-Cu into magnetic ATP by ultrasonic impregnation, and evaluated Hg 0 removal e ciency under different conditions.…”

Section: Introductionmentioning

confidence: 99%

Removal of elemental mercury from flue gas using the magnetic attapulgite by Mn-Cu oxides modification

Long

et al. 2021

Environ Sci Pollut Res

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Mercury pollution has become one of the most concerned environmental issues in the world because of its high toxicity, non-degradability and bioaccumulation. Attapulgite adsorbents modi ed by magnetic manganese-copper (Mn x Cu y -MATP) were fabricated by co-precipitation and ultrasonic impregnation method,aiming at removing Hg 0 from coal-red ue gas. BET, SEM, XRD, VSM and XPS were used to systematically explore the physical and chemical properties of the adsorbents, the effects of manganese and copper additions, reaction temperature and various components in the ue gas on the e ciency of Hg 0 removal were investigated. Mn 8 Cu 5 -MATP exhibited the optimal properties, and excessive copper loadings led to the aggregation of the active components. The e ciency of mercury removal can be effectively improved by NO and HCl regardless of the absence and presence of O 2 , because the NO + , NO 3 , NO 2 and Cl* produced during the reaction can promote the adsorption and oxidation of Hg 0 . SO 2 and H 2 O inhibited the oxidation of Hg 0 because of the competitive adsorption at the active sites, while a large amount of sul te and sulfate were formed to block the pores. However, the introduction of copper caused the sample to obtain SO 2 resistance, which resulted in a mercury removal e ciency of 84.3% even under 1500 ppm SO 2 . In addition, after 5 cycles of adsorption and regeneration, Mn 8 Cu 5 -MATP can still maintain excellent Hg 0 removal ability. The fabricated adsorbent can save the actual production cost and effectively improve the mercury removal e ciency in sulfur-containing ue gas.

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Magnetic γ-Fe₂O₃-Loaded Attapulgite Sorbent for Hg⁰ Removal in Coal-Fired Flue Gas

Abstract: A magnetically recoverable composite mercury removal sorbent was produced by introducing magnetic γ-Fe2O3 into attapulgite (ATT) (xFe1ATT) via coprecipitation

Cited by 33 publications

References 66 publications

Review on Magnetic Adsorbents for Removal of Elemental Mercury from Flue Gas

Review on Magnetic Adsorbents for Removal of Elemental Mercury from Flue Gas

Removal of Elemental Mercury from Flue Gas using the Magnetic Attapulgite by Mn-Cu Oxides Modification

Removal of elemental mercury from flue gas using the magnetic attapulgite by Mn-Cu oxides modification

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