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SORPTION OF ELEMENTAL MERCURY BY ACTIVATED CARBONS
Citation:
Krishnan, S. V., B K. Gullett*, AND W. Jozewica. SORPTION OF ELEMENTAL MERCURY BY ACTIVATED CARBONS. ENVIRONMENTAL SCIENCE & TECHNOLOGY 28(8):1506-1512, (1994).
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Description:
The mechanisms and rate of elemental mercury (HgO) capture by activated carbons have been studied using a bench-scale apparatus. Three types of activated carbons, two of which are thermally activated (PC-100 and FGD) and one with elemental sulfur (S) impregnated in it (HGR), were chosen to study the effects of surface area (approximately 550-1000 m2/g), sorption temperature (23-140 °C), and HgO concentration (30 and 60 ppb of Hgo in nitrogen). Investigations revealed that sorption occurs in active sites in PC-100 and FGD which are either depleted or deactivated upon heat treatment at 140 °C. For HGR, sorption at 23 °C occurred in non-S sites residing in the external surface, and sorption of 140 °C primarily occurred through the reaction of HgO and S. Desorption studies for PC-100 and HGR revealed the sorption mechanism to be a combination of physisorption and chemisorption at 23 °C, whereas chemisorption is the primary route at 140 °C.
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