Carbon materials loaded with maghemite as regenerable sorbents for gaseous Hg0 removal

Antuña-Nieto, Cristina; Rodríguez, Edgar Charry; López-Antón, M. Antonia; Garcı́a, Roberto; Martı́nez-Tarazona, M. Rosa

doi:10.1016/j.cej.2020.124151

Cited by 21 publications

(9 citation statements)

References 43 publications

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“…151,152 Several studies demonstrated that oxygen vacancies can be generated with the reduction of Co 3+ in Co 3 O 4 to Co 2+ , hence easily adsorbing gas phase O 2 to yield surface oxygen. 153 Because Co 3+ primary exists on the Co 3 O 4 (220) facet, fully exposing (220) facet could generate more oxygen defects. 143,154 A novel approach was proposed by Zhu et al 155 to control prepared Co 3 O 4 nanosheets with exposing the (220) facet.…”

Section: Transition Metal Oxides Sorbentmentioning

confidence: 99%

“…143,154 A novel approach was proposed by Zhu et al 155 to control prepared Co 3 O 4 nanosheets with exposing the (220) facet. The (220) facet possessed a relatively high Co 3+ / Co 2+ ratio, hence generating more oxygen vacancies relying on the reduction of Co 3+ (shown in Figure 13). As a result, the Co 3 O 4 nanosheets with a large number of oxygen vacancies showed excellent Hg 0 removal efficiency.…”

Section: Transition Metal Oxides Sorbentmentioning

confidence: 99%

“…The surface area also decreased as the increase of γ-Fe 2 O 3 loading amount. 220 One dimensional (1D) carbon nanofiber (CNF) is a promising support because of the large surface area and high porosity. The larger surface area provided more space for anchoring bare magnetic sorbents.…”

Section: Regenerable Magnetic Sorbentsmentioning

confidence: 99%

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Mercury Removal from Flue Gas by Noncarbon Sorbents

Yang

Zhao

et al. 2021

Energy Fuels

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Mercury emitted from coal-fired power production industries is an enormous threat to human health and ecosystems. Sorbent injection is a promising and feasible strategy for mercury removal from the flue gas. Activated carbons (ACs) are the most explored mercury sorbents, which generally displayed high adsorption capacity. However, ACs still suffer from some disadvantages, such as impeding the utilization of fly ash in concrete production, difficulty to be regenerated for recycle, and so on. Thus, many noncarbon sorbents have been developed as supplementary options besides ACs for mercury removal. A review on the recent progress regarding noncarbon sorbents for removing mercury is provided. In this contribution, the Hg 0 removal capacities of natural minerals, waste-derived sorbents, metal oxides, metal sulfides, and magnetic adsorbents have been summarized. Particularly, the modification methods as well as their intrinsic roles for each types of noncarbon sorbents have been presented and discussed in depth. This work provides guidance for the design and exploration of noncarbon adsorbents, which can be applied in both coal-fired power plants and other nonpower production industries.

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Section: Transition Metal Oxides Sorbentmentioning

confidence: 99%

Section: Transition Metal Oxides Sorbentmentioning

confidence: 99%

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Mercury Removal from Flue Gas by Noncarbon Sorbents

Yang

Zhao

et al. 2021

Energy Fuels

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“…Because of its relatively sufficient oxygen functional groups, developed pore structure, and large surface area, activated carbon (AC) is one of the most widely used adsorbents for Hg 0 capture. 79,80 However, the raw AC often suffers from relatively poor Hg 0 removal performance. 81 The modification of magnetic materials can not only reduce the consumption and operating cost of AC but also improve the Hg 0 removal performance of AC.…”

Section: Hg 0 Removal Performance Of Magnetic Adsorbentsmentioning

confidence: 99%

“…As a result of its variety diversity, flexible surface chemistry, and large surface area, carbon materials are considered to be the most potential adsorbent for effectively removing Hg 0 from flue gas. − However, a series of shortcomings, such as a high C/Hg ratio, low utilization rate, difficult separation/recovery, and secondary release of Hg 0 from fly ash, have greatly restricted the application and development of carbon-based adsorbents. , The introduction of magnetic materials into carbon-based adsorbents is considered to be one of the effective methods to overcome the above shortcomings. Because of its relatively sufficient oxygen functional groups, developed pore structure, and large surface area, activated carbon (AC) is one of the most widely used adsorbents for Hg 0 capture. , However, the raw AC often suffers from relatively poor Hg 0 removal performance . The modification of magnetic materials can not only reduce the consumption and operating cost of AC but also improve the Hg 0 removal performance of AC.…”

Section: Hg0 Removal Performance Of Magnetic Adsorbentsmentioning

confidence: 99%

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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Cu‐modified Fe‐Mn magnetic mercury adsorbent and anti‐SO₂ characteristic

Shang,

Gong,

Duan

et al. 2024

Asia-Pacific J Chem Eng

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A series of Fe6Mn1Cux adsorbents for mercury removal were prepared by using co‐precipitation and impregnation methods. The performance of mercury adsorption and anti‐SO2 characteristic was studied in a fixed‐bed experimental system. The effect of Cu doping amount, reaction temperature, and flue gas components on mercury removal was investigated. The mercury species on the spent adsorbent was analyzed through Hg‐TPD test. The physical–chemical features were characterized by using the N2 adsorption/desorption, VSM, XPS, and XRD. It was found that the Fe6Mn1Cu0.4 exhibited a high performance of mercury adsorption and well magnetic property and good sulfur resistance. Under high concentration of SO2, the average adsorption efficiency of Fe6Mn1Cu0.4 adsorbent achieved 99%. Cu modification optimized the pore structure and improved the mercury removal performance as well as SO2 resistance. The XPS analysis indicated that Mn4+ was the main form that played an important role in oxidizing Hg0, as a result of decrement of Mn4+ after mercury adsorption. Mercury adsorbed on the spent adsorbent was HgO and HgSO4.

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Carbon materials loaded with maghemite as regenerable sorbents for gaseous Hg0 removal

Cited by 21 publications

References 43 publications

Mercury Removal from Flue Gas by Noncarbon Sorbents

Mercury Removal from Flue Gas by Noncarbon Sorbents

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

Cu‐modified Fe‐Mn magnetic mercury adsorbent and anti‐SO₂ characteristic

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Carbon materials loaded with maghemite as regenerable sorbents for gaseous Hg0 removal

Cited by 21 publications

References 43 publications

Mercury Removal from Flue Gas by Noncarbon Sorbents

Mercury Removal from Flue Gas by Noncarbon Sorbents

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

Cu‐modified Fe‐Mn magnetic mercury adsorbent and anti‐SO2 characteristic

Contact Info

Product

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Cu‐modified Fe‐Mn magnetic mercury adsorbent and anti‐SO₂ characteristic