| Roles of sulfuric acid in elemental mercury removal by activated carbon and sulfur-impregnated activated carbon. | |
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MedLine Citation:
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PMID: 22681637 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This work addresses the discrepancy in the literature regarding the effects of sulfuric acid (H(2)SO(4)) on elemental Hg uptake by activated carbon (AC). H(2)SO(4) in AC substantially increased Hg uptake by absorption particularly in the presence of oxygen. Hg uptake increased with acid amount and temperature exceeding 500 mg-Hg/g-AC after 3 days at 200 °C with AC treated with 20% H(2)SO(4). In the absence of other strong oxidizers, oxygen was able to oxidize Hg. Upon oxidation, Hg was more readily soluble in the acid, greatly enhancing its uptake by acid-treated AC. Without O(2), S(VI) in H(2)SO(4) was able to oxidize Hg, thus making it soluble in H(2)SO(4). Consequently, the presence of a bulk H(2)SO(4) phase within AC pores resulted in an orders of magnitude increase in Hg uptake capacity. However, the bulk H(2)SO(4) phase lowered the AC pore volume and could block the access to the active surface sites and potentially hinder Hg uptake kinetics. AC treated with SO(2) at 700 °C exhibited a much faster rate of Hg uptake attributed to sulfur functional groups enhancing adsorption kinetics. SO(2)-treated carbon maintained its fast uptake kinetics even after impregnation by 20% H(2)SO(4). |
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Authors:
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Eric A Morris; Donald W Kirk; Charles Q Jia; Kazuki Morita |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2012-07-03 |
Journal Detail:
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Title: Environmental science & technology Volume: 46 ISSN: 1520-5851 ISO Abbreviation: Environ. Sci. Technol. Publication Date: 2012 Jul |
Date Detail:
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Created Date: 2012-07-17 Completed Date: 2012-11-19 Revised Date: 2012-12-19 |
Medline Journal Info:
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Nlm Unique ID: 0213155 Medline TA: Environ Sci Technol Country: United States |
Other Details:
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Languages: eng Pagination: 7905-12 Citation Subset: IM |
Affiliation:
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Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College St., Toronto, Ontario, Canada M5S 3E5. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Absorption Adsorption Charcoal / chemistry* Mercury / isolation & purification* Oxygen / chemistry Particle Size Porosity Solubility Solutions Sulfur / chemistry* Sulfur Dioxide / chemistry Sulfuric Acids / chemistry* Temperature Volatilization Water / chemistry |
| Chemical | |
Reg. No./Substance:
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0/Solutions; 0/Sulfuric Acids; 16291-96-6/Charcoal; 7439-97-6/Mercury; 7446-09-5/Sulfur Dioxide; 7704-34-9/Sulfur; 7732-18-5/Water; 7782-44-7/Oxygen; O40UQP6WCF/sulfuric acid |
| Comments/Corrections | |
Erratum In:
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Environ Sci Technol. 2012 Oct 2;46(19):10857 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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