Document Detail

Magnesium hydroxide extracted from a magnesium-rich mineral for CO2 sequestration in a gas-solid system.
MedLine Citation:
PMID:  18497118     Owner:  NLM     Status:  MEDLINE    
Magnesium hydroxide extracted from magnesium-bearing minerals is considered a promising agent for binding CO2 as a carbonate mineral in a gas-solid reaction. An efficient extraction route consisting of hydrothermal treatment on serpentine in HCl followed by NaOH titration for Mg(OH)2 precipitation was demonstrated. The extracted Mg(OH)2 powder had a mean crystal domain size as small as 12 nm and an apparent surface area of 54 m2/g. Under one atmosphere of 10 vol% CO2/N2, carbonation of the serpentine-derived Mg(OH)2 to 26% of the stoichiometric limit was achieved at 325 degrees C in 2 h; while carbonation of a commercially available Mg(OH)2, with a mean crystal domain size of 33 nm and an apparent surface area of 3.5 m2/g, reached only 9% of the stoichiometric limit. The amount of CO2 fixation was found to be inversely proportional to the crystal domain size of the Mg(OH)2 specimens. The experimental data strongly suggested that only a monolayer of carbonates was formed on the crystal domain boundary in the gas-solid reaction, with little penetration of the carbonates into the crystal domain.
Pao-Chung Lin; Cheng-Wei Huang; Ching-Ta Hsiao; Hsisheng Teng
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  42     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-05-23     Completed Date:  2008-07-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2748-52     Citation Subset:  IM    
Department of Chemical Engineering and Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 70101, Taiwan.
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MeSH Terms
Asbestos, Serpentine / chemistry*
Carbon Dioxide / chemistry*
Magnesium Hydroxide / chemistry*
Reg. No./Substance:
0/Asbestos, Serpentine; 0/Gases; 124-38-9/Carbon Dioxide; 1309-42-8/Magnesium Hydroxide

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