EPA Science Inventory

ELEMENTAL MERCURY ADSORPTION BY ACTIVATED CARBON TREATED WITH SULFURIC ACID

Citation:

Li, Y., S D. Serre**, C W. Lee*, AND B K. Gullett*. ELEMENTAL MERCURY ADSORPTION BY ACTIVATED CARBON TREATED WITH SULFURIC ACID. Presented at EPA/DOE/EPRI Megasymposium, Chicago,IL, 8/20-24/01.

Description:

The paper gives results of a study of the adsorption of elemental mercury at 125 C by a sulfuric-acid (H2S04, 50% w/w/ solution)-treated carbon for the removal of mercury from flue gas. The pore structure of the sample was characterized by nitrogen (N2) at -196 C and the t-plot method anlaysis. Thermogravimetric analaysis (TGA) was used to examine the thermal behaviors of the treated sample. Study results show that the H2S04-treated carbon has a very high elemental mercury capture capacity (27 mg/g) via a physisorption mechanism. The pore volume and surface area of the treated carbon were drastically reduced due to adsorption of the H2S04 in the micropores of the carbon, resulting in a narrower microporisity. A significant amount of water (H20) was found to remain in the carbon through hydrogen bonding with the H2S04 molecules. It is suggested that the elemental mercury adsorption capacity of the H2S04-treated carbon can be explained by the enhanced adsorption potential and enthalpy of adsorption. The enhancements may result either from the narrow microporisity due to overlapping of the adsorption field from the neighboring pore walls, or from the increased surface polarity with which coulombic contributions from polarization energy to the overall adsorption potential could be significant.

Record Details:

Record Type: DOCUMENT (PRESENTATION/PAPER)
Start Date: 08/20/2001
Completion Date: 08/20/2001
Record Last Revised: 06/21/2006
Record Created: 09/26/2003
Record Released: 09/26/2003
Record ID: 63900

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

AIR POLLUTION PREVENTION AND CONTROL DIVISION

AIR POLLUTION TECHNOLOGY BRANCH