Document Detail


Activated carbon with excellent chromium(VI) adsorption performance prepared by acid-base surface modification.
MedLine Citation:
PMID:  16914264     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In the present work, activated carbon (AC) with excellent Cr(VI) adsorption performance especially at low concentrations was prepared by an acid-base surface modification method. Raw activated carbon (AC(0)) was first oxidized in boiling HNO(3) (AC(1)), then treated with a mixture of NaOH and NaCl (AC(2)). Batch equilibrium and continuous column adsorption were conducted to evaluate the adsorption performance. Boehm titration, elemental analysis, and N(2)/77K adsorption isotherm methods were used to characterize the surface properties and pore structure of modified ACs. The results revealed that the modified AC exhibited excellent Cr(VI) adsorption performance in terms of adsorption capacity and adsorption rate: AC(2)>AC(1)>AC(0). Modification caused S(BET) to decrease and the total number of surface oxygen acidic groups to increase. HNO(3) oxidization produced positive acid groups, and subsequently NaOH treatment replaced H(+) of surface acid groups by Na(+), and the acidity of AC decreased. The main cause of higher Cr(VI) adsorption capacity and rate for AC(2) was the presence of more oxygen surface acidic groups and suitable surface acidity. HNO(3)-NaOH modification shows potential for the preparation of high quality AC for the effective removal of low concentrations of Cr(VI).
Authors:
S X Liu; X Chen; X Y Chen; Z F Liu; H L Wang
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Publication Detail:
Type:  Journal Article     Date:  2006-07-10
Journal Detail:
Title:  Journal of hazardous materials     Volume:  141     ISSN:  0304-3894     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-02-20     Completed Date:  2007-06-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  315-9     Citation Subset:  IM    
Affiliation:
College of Material Science and Engineering, Northeast Forestry University, Harbin, Heilongjiang 150040, China. liushouxin@126.com
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Charcoal / chemistry*
Chromium / chemistry*
Hydrogen-Ion Concentration
Surface Properties
Waste Disposal, Fluid / methods*
Chemical
Reg. No./Substance:
16291-96-6/Charcoal; 18540-29-9/chromium hexavalent ion; 7440-47-3/Chromium

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