Efficient removal of mercury from flue gases by regenerable cerium-doped functional activated carbon derived from resin made by in situ ion exchange method

Wu, Shengji; Yan, Pengjie; Yu, Wangsheng; Cheng, Kai; Wang, Hui; Yang, Wei; Zhou, Jie; Xi, Junhua; Qiu, Jieshan; Zhu, Shizheng; Che, Lianqiang

doi:10.1016/j.fuproc.2019.106167

Cited by 39 publications

(8 citation statements)

References 49 publications

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“…To date, activated carbon injection technology is considered as a promising mercury control technology for coal-fired power plants with the advantage of guaranteed high performance in vapor phase mercury removal and many attempts have been made to make it more commercial acceptable by lowering down the operating cost in recent years, including sorbent modification with halogen − and sulfur , to improve the mercury uptake capacity of sorbents or replacing costly commercial activated carbon with other low-cost sorbents prepared from waste materials, such as biomass and petroleum coke . Emphasis is also given to prepare the surface-modified adsorbents using different procedures, such as solution impregnation, , heat treatment, , plasma treatment, , and microwave treatment, to enhance the potential for mercury adsorption.…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Sulfur Forms on Gas-Phase Mercury Removal by SO₂-Impregnated Porous Carbons

et al. 2020

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Due to widespread global mercury pollution via anthropogenic activities such as coal combustion and its severe toxicity even at low concentrations, it is necessary to remove mercury from power plant flue gas to protect both humans and the ecosystem. Currently, significant efforts are being made to maximize Hg 0 adsorption rates while minimizing the impact on the cost of electricity. The purpose of this study is to explore the influence of different sulfur forms on vapor Hg 0 removal by SO 2 -impregnated porous carbons. After SO 2 impregnation, reductive heat treatment in N 2 and H 2 O 2 oxidation process was used to diverge the sulfur form composition in porous carbons. The ultimate and X-ray photoelectron spectroscopy analysis were used to verify the sulfur species. The pore structures of sorbents were determined by nitrogen adsorption/desorption measurements. Then, their mercury removal performance was investigated in a fixed-bed reactor and the influence of different sulfur forms on equilibrium mercury adsorption capacity and mercury desorption was studied. Finally, the kinetics of mercury adsorption on SO 2 -impregnated sorbents was explored to identify whether the adsorption process is controlled by chemical adsorption. The results showed that apparent increases in the quantities of reduced sulfur species were observed after heat treatment, which is assumed to be beneficial for mercury adsorption. H 2 O 2 oxidation after SO 2 impregnation has caused a loss of reduced and nonoxidized sulfur forms in porous carbons, as well as an increase in insoluble oxidized sulfur species. One interesting finding is that even though the micropore volumes of porous carbons decreased after heat treatment, the Hg 0 adsorption capacities of reduced samples and the thermal stability of adsorbed mercury were both positively raised. After H 2 O 2 treatment, the oxidized SO 2 impregnated samples showed an obvious decrease in Hg 0 adsorption capacity. Compared with nonoxidized and oxidized sulfur forms, the reduced sulfur forms have shown a rather significant correlation with the mercury adsorption performance of SO 2 -impregnated samples. Kinetic analysis illustrates that mercury adsorption on SO 2 -impregnated porous carbons was mainly controlled by chemical adsorption.

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Section: Introductionmentioning

confidence: 99%

Influence of Different Sulfur Forms on Gas-Phase Mercury Removal by SO₂-Impregnated Porous Carbons

et al. 2020

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“…As a highly toxic heavy metal, mercury has a huge threat to human health due to its bioaccumulation and global atmospheric circulation, so the removal of mercury has received more and more attention. , There were three forms of mercury that existed in the coal-fired flue gas, including elemental mercury (Hg 0 ), divalent mercury (Hg 2+ ), and solid-phase particulate mercury (Hg p ). − In general, electrostatic precipitator and fabric filter can effectively capture Hg p in the flue gas. , The Hg 2+ in the gas-phase mercury can be removed by a wet flue gas desulfurization system. , However, due to its low water solubility and high volatility, Hg 0 is difficult to directly remove. , …”

Section: Introductionmentioning

confidence: 99%

CuS-Doped Ti₃C₂ MXene Nanosheets for Highly Efficient Adsorption of Elemental Mercury in Flue Gas

Wei

et al. 2022

Energy Fuels

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Mercury pollution in flue gas from coal-fired power plants will seriously harm the ecological environment and biological safety. The flue gas is often accompanied by acid gases (SO 2 , NO), which will seriously affect the efficiency of the mercury adsorbent. In this work, a new type of metal sulfide CuS-modified Ti 3 C 2 adsorbent has been prepared, which has a strong resistance to acid gases. Moreover, when the weight percentage of CuS is 10 wt %, the synthesized composite material (TC-10) has a very excellent efficiency of mercury removal, and the adsorption capacity is as high as 20.478 mg•g −1 . X-ray photoelectron spectroscopy results show that disulfide ions (S 2 2−) and adsorbed oxygen are the main active substances. 3DFT calculation was used to further analyze the interaction between Hg 0 and the pristine Ti 3 C 2 adsorbent and the modified CuS/Ti 3 C 2 . Results show that CuS doping increases the activity of the pristine Ti 3 C 2 surface. Therefore, this study proves that CuS/Ti 3 C 2 is a promising material for removing mercury from coal-fired power plants and expands the application range of MXene.

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“…In such a panorama, it is imperative to develop methods for Hg(II) removal. Nowadays, the removal methods include adsorption [ 7 ], membrane filtration [ 8 ], ion-exchange [ 9 ], electrocoagulation [ 10 ], and electrodeposition [ 11 ]. Among them, adsorption is the most promising technique due to its effortlessness, non-secondary treatment step, and profitable use [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Mercury on Oxidized Graphenes

et al. 2022

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Graphene oxide (GO) and its reduced form, reduced graphene oxide (rGO), are among the most predominant graphene derivatives because their unique properties make them efficient adsorbent nanomaterials for water treatment. Although extra-functionalized GO and rGO are customarily employed for the removal of pollutants from aqueous solutions, the adsorption of heavy metals on non-extra-functionalized oxidized graphenes has not been thoroughly studied. Herein, the adsorption of mercury(II) (Hg(II)) on eco-friendly-prepared oxidized graphenes is reported. The work covers the preparation of GO and rGO as well as their characterization. In a further stage, the description of the adsorption mechanism is developed in terms of the kinetics, the associated isotherms, and the thermodynamics of the process. The interaction between Hg(II) and different positions of the oxidized graphene surface is explored by DFT calculations. The study outcomes particularly demonstrate that pristine rGO has better adsorbent properties compared to pristine GO and even other extra-functionalized ones.

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Efficient removal of mercury from flue gases by regenerable cerium-doped functional activated carbon derived from resin made by in situ ion exchange method

Cited by 39 publications

References 49 publications

Influence of Different Sulfur Forms on Gas-Phase Mercury Removal by SO₂-Impregnated Porous Carbons

Influence of Different Sulfur Forms on Gas-Phase Mercury Removal by SO₂-Impregnated Porous Carbons

CuS-Doped Ti₃C₂ MXene Nanosheets for Highly Efficient Adsorption of Elemental Mercury in Flue Gas

Adsorption of Mercury on Oxidized Graphenes

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Efficient removal of mercury from flue gases by regenerable cerium-doped functional activated carbon derived from resin made by in situ ion exchange method

Cited by 39 publications

References 49 publications

Influence of Different Sulfur Forms on Gas-Phase Mercury Removal by SO2-Impregnated Porous Carbons

Influence of Different Sulfur Forms on Gas-Phase Mercury Removal by SO2-Impregnated Porous Carbons

CuS-Doped Ti3C2 MXene Nanosheets for Highly Efficient Adsorption of Elemental Mercury in Flue Gas

Adsorption of Mercury on Oxidized Graphenes

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Influence of Different Sulfur Forms on Gas-Phase Mercury Removal by SO₂-Impregnated Porous Carbons

Influence of Different Sulfur Forms on Gas-Phase Mercury Removal by SO₂-Impregnated Porous Carbons

CuS-Doped Ti₃C₂ MXene Nanosheets for Highly Efficient Adsorption of Elemental Mercury in Flue Gas