Enhancement of elemental mercury adsorption by silver supported material
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Publication Details
Author list: Khunphonoi R., Khamdahsag P., Chiarakorn S., Grisdanurak N., Paerungruang A., Predapitakkun S.
Publisher: Elsevier
Publication year: 2015
Journal: Journal of Environmental Sciences (1001-0742)
Volume number: 32
Start page: 207
End page: 216
Number of pages: 10
ISSN: 1001-0742
Languages: English-Great Britain (EN-GB)
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Abstract
Mercury, generally found in natural gas, is extremely hazardous. Although average mercury levels are relatively low, they are further reduced to comply with future mercury regulations, which are stringent in order to avoid releasing to the environment. Herein, vapor mercury adsorption was therefore investigated using two kinds of supports, granular activated carbon (GAC) and titanium dioxide (TiO2). Both supports were impregnated by silver (5 and 15wt.%), before testing against a commercial adsorbent (sulfur-impregnated activated carbon, SAC). The adsorption isotherm, kinetics, and its thermodynamics of mercury adsorption were reported. The results revealed that Langmuir isotherm provided a better fit to the experimental data. Pseudo second-order was applicable to describe adsorption kinetics. The higher uniform Ag dispersion was a key factor for the higher mercury uptake. TiO2 supported silver adsorbent showed higher mercury adsorption than the commercial one by approximately 2 times. Chemisorption of mercury onto silver active sites was confirmed by an amalgam formation found in the spent adsorbents. ฉ 2015. The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences.
Keywords
Amalgam, Mercury
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