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Uptake of Elemental Mercury Vapors by Activated Carbons
The adsorptive capacities of virgin and sulfur-impregnated activated carbons (GAC) for gas-phase mercury were evaluated as a function of temperature and influent mercury concentration. The virgin activated carbon showed little adsorptive capacity, especially at temperatures above 90 °C. The isothermal representation of the adsorptive capacity for virgin GAC exhibited a semi-logarithmic relationship at 50 °C, 90 °C, and 140 °C. The pronounced effect of temperature on the adsorptive capacity evidences a physical adsorption mechanism between the mercury and virgin GAC. Sulfur-impregnated activated carbons exhibited enhanced mercury removal efficiency over the non-impregnated varieties, due to formation of mercuric sulfide on the carbon surface. This chemisorption process is enhanced by increased temperatures between 25 °C and 90 °C, yielding increased removal efficiency of elemental mercury. However, at 140 °C a decrease in adsorptive capacity occurs, indicating reduced formation of mercuric sulfide. The method used for impregnating GAC with sulfur had a pronounced effect on mercury removal capacity. The chemical bonding of sulfur at 600 °C provides a more uniform distribution of sulfur throughout the GAC pore structure than is achieved by conventional condensation techniques, yielding improved performance.
Uptake of Elemental Mercury Vapors by Activated Carbons
The adsorptive capacities of virgin and sulfur-impregnated activated carbons (GAC) for gas-phase mercury were evaluated as a function of temperature and influent mercury concentration. The virgin activated carbon showed little adsorptive capacity, especially at temperatures above 90 °C. The isothermal representation of the adsorptive capacity for virgin GAC exhibited a semi-logarithmic relationship at 50 °C, 90 °C, and 140 °C. The pronounced effect of temperature on the adsorptive capacity evidences a physical adsorption mechanism between the mercury and virgin GAC. Sulfur-impregnated activated carbons exhibited enhanced mercury removal efficiency over the non-impregnated varieties, due to formation of mercuric sulfide on the carbon surface. This chemisorption process is enhanced by increased temperatures between 25 °C and 90 °C, yielding increased removal efficiency of elemental mercury. However, at 140 °C a decrease in adsorptive capacity occurs, indicating reduced formation of mercuric sulfide. The method used for impregnating GAC with sulfur had a pronounced effect on mercury removal capacity. The chemical bonding of sulfur at 600 °C provides a more uniform distribution of sulfur throughout the GAC pore structure than is achieved by conventional condensation techniques, yielding improved performance.
Uptake of Elemental Mercury Vapors by Activated Carbons
Vidic, Radisav D. (author) / McLaughlin, J. Brendan (author)
Journal of the Air & Waste Management Association ; 46 ; 241-250
1996-03-01
10 pages
Article (Journal)
Electronic Resource
Unknown
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