Document Detail

Hexavalent chromium [Cr(VI)] removal by acid modified waste activated carbons.
MedLine Citation:
PMID:  19553008     Owner:  NLM     Status:  MEDLINE    
Fresh activated carbon (AC) and waste activated carbon (WAC) were pretreated by heating with mineral acids (sulfuric acid and nitric acid) at high temperature to prepare several grades of adsorbents to evaluate their performance on Cr(VI) removal from aqueous phase. Effects of temperature, agitation speed and pH were tested, and optimum conditions were evaluated. Kinetic study was performed under optimum conditions with several grades of modified adsorbents to know the rates of adsorption. Batch adsorption equilibrium data followed both, Freuindlich and Langmuir isotherms. Maximum adsorption capacity (q(max)) of the selected adsorbents treated with sulfuric acid (MWAC 1) and nitric acid (MWAC 2), calculated from Langmuir isotherm are 7.485 and 10.929 mg/g, respectively. Nitric acid treated adsorbent (MWAC 2) was used for column study to determine the constants of bed depth service time (BDST) model for adsorption column design.
Pranab Kumar Ghosh
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Publication Detail:
Type:  Journal Article     Date:  2009-06-06
Journal Detail:
Title:  Journal of hazardous materials     Volume:  171     ISSN:  1873-3336     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-09-28     Completed Date:  2010-01-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  116-22     Citation Subset:  IM    
Department of Civil Engineering, Indian Institute of Technology Guwahati, PIN-781039, India.
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MeSH Terms
Carbon / chemistry*
Chromium / analysis,  isolation & purification*
Hydrogen-Ion Concentration
Nitric Acid / chemistry
Sulfuric Acids / chemistry
Water Pollutants, Chemical / analysis,  isolation & purification*
Water Purification / methods*
Reg. No./Substance:
0/Sulfuric Acids; 0/Water Pollutants, Chemical; 18540-29-9/chromium hexavalent ion; 7440-44-0/Carbon; 7440-47-3/Chromium; 7664-93-9/sulfuric acid; 7697-37-2/Nitric Acid

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