Mercury Removal

Monterroso, Rodolfo; Fan, Maohong; Argyle, Morris D.

doi:10.1016/b978-0-8155-2049-8.10009-9

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…A number of remedial techniques have been employed for the removal of mercury such as oxidation, electrofloatation, chemical precipitation, ion exchange, coprecipitation, adsorption, reduction, flocculation, and dry sorbent injection, among which adsorption has been proved to be the most practical and economical choice for the removal of mercury from wastewater and from flue gases. 5,6 Due to high volatility of Hg 0 and low solubility in water, conversion of Hg 0 to Hg 2+ has become a significant focus in the development of appropriate mercury control technologies because Hg 2+ is more water-soluble and better adsorbed onto adsorbent materials. 7 One of the most commonly used adsorbents is activated carbon due to its excellent adsorption capacity for organic and inorganic pollutants.…”

Section: Introductionmentioning

confidence: 99%

Chitosan–Thiobarbituric Acid: A Superadsorbent for Mercury

et al. 2018

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In the present investigation, chitosan (CH) was supramolecularly cross-linked with thiobarbituric acid to form CT. CT was well characterized by UV, scanning electron microscopy–energy-dispersive X-ray analysis, Fourier transform infrared, NMR, differential scanning calorimetry, thermogravimetric analysis, and X-ray diffraction analyses, and its adsorption potential for elemental mercury (Hg 0 ), inorganic mercury (Hg 2+ ), and methyl mercury (CH 3 Hg + ) was investigated. Adsorption experiments were conducted to optimize the parameters for removal of the mercury species under study, and the data were analyzed using Langmuir, Freundlich, and Temkin adsorption isotherm models. CT was found to have high adsorption capacities of 1357.69, 2504.86, and 2475.38 mg/g for Hg 0 , Hg 2+ , and CH 3 Hg + , respectively. The adsorbent CT could be reused up to three cycles by eluting elemental mercury using 0.01 N thiourea, inorganic mercury using 0.01 N perchloric acid, and methyl mercury with 0.2 N NaCl.

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Section: Introductionmentioning

confidence: 99%

Chitosan–Thiobarbituric Acid: A Superadsorbent for Mercury

et al. 2018

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“…The speciation is said to be dependent upon the concentration of sulfur and halogens in the coal, ,,, flue gas temperature, and composition. ,,, Hg 0 is released upon volatilization at about 200 °C and continues throughout coal combustion. It can then be oxidized to Hg 2+ via homogeneous (gas phase) and/or heterogeneous (gas–solid) oxidation reactions during post-combustion and as the flue gas cools. ,,, Oxidized mercury may either be gaseous (g) or solid (s) inorganic mercuric compounds, Hg 2+ X [where X is an anion, e.g., Cl 2 (g), SO 4 (s), O(g or s), or S(s)]. , Galbreath and Zygarlicke, and Monterroso et al detailed the possible transformations of mercury in a combustion system, which are represented in Figure . Table presents the appearance of different Hg species typically resulting from the combustion of coal as summarized by Monterroso et al In fly ash (FA), the order of mercury appearance as per thermodynamic equilibrium calculations is HgCl 2 < HgS < HgO .…”

Section: Introductionmentioning

confidence: 99%

“…The gaseous Hg 2+ is soluble and has a tendency to associate with particulate matter and become captured as Hg P . Hence, Hg 2+ and Hg P can easily be captured through conventional air pollution control devices (APCDs), such as electrostatic precipitators (ESPs), fabric filter (FF) or bag houses, scrubbers, flue gas desulfurizers (FGDs), and selective catalytic reducers (SCRs). ,, …”

Section: Introductionmentioning

confidence: 99%

Impacts of Sulfur Oxides on Mercury Speciation and Capture by Fly Ash during Oxy-fuel Pulverized Coal Combustion

et al. 2016

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Coal-fired utility boilers are the single largest anthropogenic source of mercury emissions. Mercury is a naturally occurring trace element in coal and, when combusted, may exist in three different forms: Hg0, Hg2+, or Hg particulate. During oxy-fuel combustion, impurity concentrations, such as SO x , NO x , and Hg, can be up to 4 times higher than concentrations in air combustion. An increased mercury concentration is of concern because mercury is known to attack aluminum heat exchangers required in the compression of CO2. As a result of the elevated concentrations during oxy-fuel conditions, interactions of Hg and SO x were investigated in this study to verify if there is any competition between SO x and Hg. The effect of Hg, SO x , H2O, and temperature on the native capture of Hg by fly ash was assessed using a quartz flow reactor packed with fly ash to simulate a bag filter. Doubling Hg in the system from 5 to 10 μg/Nm3 doubled the amount of Hg captured in the fly ash from 1.6 to 2.8% and increased the amount of Hg unaccounted from 5.8 to 18.1%. Increased SO2 decreased the proportion of Hg0 in the flue gas. The temperature in the bag filter was found to have a large impact on the mercury capture by fly ash. As the temperature was increased from 90 to 200 °C, Hg0 in the flue gas was found to increase from 77.9 to 98.3%, indicating better capture of Hg at lower temperatures.

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Influence Mechanism of O2/H2O Adsorption on Cu(111) Surface on SF6 Overheating Failure Decomposition

Zeng

Zhu

et al. 2022

Plasma Chem Plasma Process

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Mercury Removal

Cited by 8 publications

References 30 publications

Chitosan–Thiobarbituric Acid: A Superadsorbent for Mercury

Chitosan–Thiobarbituric Acid: A Superadsorbent for Mercury

Impacts of Sulfur Oxides on Mercury Speciation and Capture by Fly Ash during Oxy-fuel Pulverized Coal Combustion

Influence Mechanism of O2/H2O Adsorption on Cu(111) Surface on SF6 Overheating Failure Decomposition

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