Determination of the adsorptive capacity and adsorption isotherm of vapor-phase mercury chloride on powdered activated carbon using thermogravimetric analysis

Journal Article · Wed Nov 15 00:00:00 EST 2006 · Journal of the Air and Waste Management Association

OSTI ID:20838192

Lin, Hsun-Yu; Yuan, Chung-Shin; Chen, Wei-Ching; Hung, Chung-Hsuang ^[1]

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1. National Sun Yat-Sen University, Taiwan (China). Institute of Environmental Engineering

This study investigated the use of thermogravimetric analysis (TGA) to determine the adsorptive capacity and adsorption isotherm of vapor-phase mercury chloride on powdered activated carbon (PAC). The technique is commonly applied to remove mercury-containing air pollutants from gas streams emitted from municipal solid waste incinerators. An alternative form of powdered activated carbon derived from a pyrolyzed tire char was prepared for use herein. The capacity of waste tire-derived PAC to adsorb vapor-phase HgCl{sub 2} was successfully measured using a self-designed TGA adsorption system. Experimental results showed that the maximum adsorptive capacities of HgCl{sub 2} were 1.75, 0.688, and 0.230 mg of HgCl{sub 2} per gram of powdered activated carbon derived from carbon black at 30, 70, and 150{sup o} for 500 {mu}g/m{sup 3} of HgCl{sub 2}, respectively. Four adsorption isotherms obtained using the Langmuir, Freundlich, Redlich-Peterson, and Brunauer-Emmett-eller (BET) models were used to simulate the adsorption of HgCl{sub 2}. The comparison of experimental data associated with the four adsorption isotherms indicated that BET fit the experimental results better than did the other isotherms at 30{sup o}, whereas the Freundlich isotherm fit the experimental results better at 70 and 150{sup o}. Furthermore, the calculations of the parameters associated with Langmuir and Freundlich isotherms revealed that the adsorption of HgCl{sub 2} by PAC-derived carbon black favored adsorption at various HgCl{sub 2} concentrations and temperatures. 35 refs., 7 figs., 3 tabs.

• OSTI ID: 20838192
• Journal Information: Journal of the Air and Waste Management Association, Vol. 56, Issue 11; Other Information: [e-mail]; ISSN 1047-3289
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
SORPTIVE PROPERTIES
MERCURY CHLORIDES
ADSORPTION ISOTHERMS
THERMAL GRAVIMETRIC ANALYSIS
VAPORS
POWDERS
ACTIVATED CARBON
MUNICIPAL WASTES
SOLID WASTES
WASTE INCINERATORS
TIRES
BENCH-SCALE EXPERIMENTS
FLUE GAS
TEMPERATURE DEPENDENCE
SORBENT INJECTION PROCESSES