Sequential Extraction Study of Stability of Adsorbed Mercury in Chemically Modified Activated Carbons

Tong, Shitang; Fan, Mingxia; Mei, Lei; Jia, Charles Q.

doi:10.1021/es201399d

Cited by 25 publications

(19 citation statements)

References 27 publications

(66 reference statements)

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“…This result implies that the original soils were less mobile in the environment. The Hg in the industrial soil was bound to amorphous oxide-bound (step 3, 14.2%), crystalline oxide-bound (step 4, 24.2%), non-labile organic and elemental (step 5, 29.5%), and sulfide-bound and residual (step 6, 32.1%), which indicates that each step reflects the presence of various Hg compounds in the soil (Biester and Nehrke 1997 ; Tong et al 2011 ). Meanwhile, the Hg in mine soil was primarily associated with the sulfide-bound and residual (step 6, 97.8%).…”

Section: Resultsmentioning

confidence: 99%

Effect of inorganic carbonate and organic matter in thermal treatment of mercury-contaminated soil

Cho

Kang

Kim

et al. 2021

Environ Sci Pollut Res

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Thermal treatment of mercury (Hg)-contaminated soil was studied to investigate the desorption behavior of Hg at different temperatures. The soil samples were collected from two locations with different land uses around the mine and industrial site. The effect of soil properties such as inorganic carbonate minerals and organic matter content on Hg desorption was investigated to understand the thermal desorption process. The effect of soil composition on Hg desorption showed that behavior at 100 °C was similar, but a different behavior could be found at 300 °C. The thermal desorption efficiency at 300 °C is affected by the thermal properties of soils and the Hg desorption capacity of the soils. The Hg from both soil types was removed above 300 °C, and Hg was effectively removed from mine soil due to the partial decomposition of carbonate in the soil composition, while industrial soil showed that desorption would be restrained by Hg organic matter complexes due to organic matter content. Despite a relatively higher concentration of Hg in the mine soil, Hg removal efficiency was greater than that in the industrial soil. Sequential extraction results showed that only the Hg fractions (residual fractions, step 6) in mine soil changed, while the industrial soil was affected by changes in Hg fractions (step 3 to step 6) at 300 °C. Changes in soil pH during thermal desorption are also influenced by heating time and temperature. Therefore, the mechanisms of Hg desorption during thermal treatment were observed by soil properties. The volatilization of Hg in the soil is induced by organic carbon, while soil Hg release is controlled by organic matter complexes.

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Section: Resultsmentioning

confidence: 99%

Effect of inorganic carbonate and organic matter in thermal treatment of mercury-contaminated soil

Cho

Kang

Kim

et al. 2021

Environ Sci Pollut Res

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show abstract

“…This result implies that the original soils were less mobile in the environment. The Hg in the industrial soil was bound to amorphous oxide-bound (Step 3, 14.2%), crystalline oxide-bound (Step 4, 24.2%), non-labile organic and elemental (Step 5, 29.5%), and sul de-bound and residual (Step 6, 32.1%), which indicates that each step re ects the presence of various Hg compounds in the soil (Biester et al 1997;Tong et al 2011). Meanwhile, the Hg in mine soil was primarily associated with the sul de-bound and residual (Step 6, 97.8%).…”

Section: Hg Desorption E Ciency At Various Temperaturesmentioning

confidence: 99%

Effect of Inorganic Carbonate in Thermal Treatment of Mercury-contaminated Soil

Cho

Kang

Kim

et al. 2021

Preprint

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Thermal treatment of mercury (Hg)-contaminated soil was studied to investigate the desorption behavior of Hg at different temperatures. The soil samples were collected from two locations with different land uses around the mine and industrial site. The effect of soil properties such as inorganic carbonate minerals and organic matter content on Hg desorption was investigated to understand the thermal desorption process. The effect of soil composition on Hg desorption showed that behavior at 100 °C was similar, but different behavior could be found at 300 °C. The thermal desorption efficiency at 300 °C is affected by the thermal properties of soils and the Hg desorption capacity of the soils. The Hg from both soil types was removed above 300 °C, and Hg was effectively removed from mine soil due to the partial decomposition of carbonate in the soil composition, while industrial soil showed that desorption would be restrained by Hg organic matter complexes due to organic matter content. Despite a relatively higher concentration of Hg in the mine soil, Hg removal efficiency was greater than that in the industrial soil. Sequential extraction results showed that only the Hg fractions (residual fractions, F6) in mine soil changed, while the industrial soil was affected by changes in Hg fractions (F3 to F6) at 300 °C. Changes in soil pH during thermal desorption are also influenced by heating time and temperature. Therefore, the mechanisms of Hg desorption during thermal treatment were observed by soil properties. The volatilization of Hg in the soil is induced by organic carbon, while soil Hg release is controlled by organic matter complexes.

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“…These extreme conditions were not expected to be present in a landfill environment. From their study, Tong et al 12 hypothesized that a TCLP test on the brominated AC would not leach a substantial amount of Hg 0 .…”

Section: ■ Introductionmentioning

confidence: 99%

Potential Hazards of Brominated Carbon Sorbents for Mercury Emission Control

Bisson

2015

Environ. Sci. Technol.

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Mercury is a toxic air pollutant, emitted from the combustion of coal. Activated Carbon (AC) or other carbon sorbent (CS) injection into coal combustion flue gases can remove elemental mercury through an adsorption process. Recently, a brominated CS with biomass ash as the carbon source (Br-Ash) was developed as an alternative for costly AC-based sorbent for mercury capture. After mercury capture, these sorbents are disposed in landfill, and the stability of bromine and captured mercury is of paramount importance. The objective of this study is to determine the fate of mercury and bromine from Br-Ash and brominated AC after their service. Mercury and bromine leaching tests were conducted using the standard toxicity characteristic leaching procedure (TCLP). The mercury was found to be stable on both the Br-Ash and commercial brominated AC sorbents, while the bromine leached into the aqueous phase considerably. Mercury pulse injection tests on the sorbent material after leaching indicate that both sorbents retain significant mercury capture capability even after the majority of bromine was removed. Testing of the Br-Ash sorbent over a wider range of pH and liquid:solid ratios resulted in leaching of <5% of mercury adsorbed on the Br-Ash. XPS analysis indicated more organically bound Br and less metal-Br bonds after leaching.

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Sequential Extraction Study of Stability of Adsorbed Mercury in Chemically Modified Activated Carbons

Cited by 25 publications

References 27 publications

Effect of inorganic carbonate and organic matter in thermal treatment of mercury-contaminated soil

Effect of inorganic carbonate and organic matter in thermal treatment of mercury-contaminated soil

Effect of Inorganic Carbonate in Thermal Treatment of Mercury-contaminated Soil

Potential Hazards of Brominated Carbon Sorbents for Mercury Emission Control

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