Document Detail

Effect of surface acidic oxides of activated carbon on adsorption of ammonia.
MedLine Citation:
PMID:  18403110     Owner:  NLM     Status:  MEDLINE    
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.
Chen-Chia Huang; Hong-Song Li; Chien-Hung Chen
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-02-23
Journal Detail:
Title:  Journal of hazardous materials     Volume:  159     ISSN:  0304-3894     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-10-20     Completed Date:  2009-01-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  523-7     Citation Subset:  IM    
Department of Chemical Engineering, National Yunlin University of Science & Technology, Douliu, Yunlin 64002, Taiwan, ROC.
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MeSH Terms
Acids / chemistry
Ammonia / chemistry*
Carbon / chemistry*
Cocos / chemistry
Oxides / chemistry*
Spectroscopy, Fourier Transform Infrared
Surface Properties
Reg. No./Substance:
0/Acids; 0/Oxides; 7440-44-0/Carbon; 7664-41-7/Ammonia

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