| Effect of surface acidic oxides of activated carbon on adsorption of ammonia. | |
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MedLine Citation:
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PMID: 18403110 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The influence of surface acidity of activated carbon (AC) was experimentally studied on adsorption of ammonia (NH(3)). Coconut shell-based AC was modified by various acids at different concentrations. There were five different acids employed to modified AC, which included nitric acid, sulfuric acid, hydrochloric acid, phosphoric acid, and acetic acid. Acidic functional groups on the surface of ACs were determined by a Fourier transform infrared spectrograph (FTIR) and by the Boehm titration method. Specific surface area and pore volume of the ACs were measured by a nitrogen adsorption apparatus. Adsorption amounts of NH(3) onto the ACs were measured by a dynamic adsorption system at room temperature according to the principle of the ASTM standard test method. The concentration of NH(3) in the effluent stream was monitored by a gas-detecting tube technique. Experimental results showed that adsorption amounts of NH(3) on the modified ACs were all enhanced. The ammonia adsorption amounts on various activated carbons modified by different acids are in the following order: nitric acid>sulfuric acid>acetic acid approximately phosphoric acid>hydrochloric acid. It is worth to note that the breakthrough capacity of NH(3) is linearly proportional to the amount of acidic functional groups of the ACs. |
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Authors:
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Chen-Chia Huang; Hong-Song Li; Chien-Hung Chen |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-02-23 |
Journal Detail:
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Title: Journal of hazardous materials Volume: 159 ISSN: 0304-3894 ISO Abbreviation: J. Hazard. Mater. Publication Date: 2008 Nov |
Date Detail:
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Created Date: 2008-10-20 Completed Date: 2009-01-29 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9422688 Medline TA: J Hazard Mater Country: Netherlands |
Other Details:
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Languages: eng Pagination: 523-7 Citation Subset: IM |
Affiliation:
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Department of Chemical Engineering, National Yunlin University of Science & Technology, Douliu, Yunlin 64002, Taiwan, ROC. huangchc@yuntech.edu.tw |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acids
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chemistry Adsorption Ammonia / chemistry* Carbon / chemistry* Cocos / chemistry Oxides / chemistry* Porosity Spectroscopy, Fourier Transform Infrared Surface Properties |
| Chemical | |
Reg. No./Substance:
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0/Acids; 0/Oxides; 7440-44-0/Carbon; 7664-41-7/Ammonia |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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