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Sawdust—A green and economical sorbent for the removal of cadmium (II) ions
- Source :
- Journal of Hazardous Materials. 139:116-121
- Publication Year :
- 2007
- Publisher :
- Elsevier BV, 2007.
-
Abstract
- The ability of sawdust (treated and untreated) waste, a waste material derived from the commercial processing of cedrus deodar wood for furniture production, to remove/preconcentrate Cd(II) ions from aqueous solution was determined. Sorption was found to be rapid (approximately 97% within 8 min). The binding of metal ions was found to be pH dependent, optimal sorption accruing at around pH 4-8. Potentiometric titrations of sawdust revealed two distinct pK(a) values, the first having the value similar to carboxylic groups (3.3-4.8) and second comparable with that of amines (8.53-10.2) with the densities 1.99 x 10(-4) and 7.94 x 10(-5), respectively. Retained Cd(II) ions were eluted with 5 ml of 0.1 mol l(-1) HCl. Detection limit of 0.016 microg ml(-1) was achieved with enrichment factors of 120. Recovery was quantitative using sample volume of 600 ml. The Langmuir and D-R isotherm equations were used to describe partitioning behavior for the system at different temperatures. Kinetic and thermodynamic behavior of sawdust for Cd(II) ions removal was also studied.
- Subjects :
- Langmuir
Time Factors
Environmental Engineering
Sorbent
Cations, Divalent
Health, Toxicology and Mutagenesis
Metal ions in aqueous solution
Potentiometric titration
chemistry.chemical_element
Water Purification
Environmental Chemistry
Cedrus
Waste Management and Disposal
Cadmium
Aqueous solution
Chromatography
Temperature
Water
Sorption
Hydrogen-Ion Concentration
Wood
Pollution
Kinetics
chemistry
Metals
visual_art
visual_art.visual_art_medium
Thermodynamics
Environmental Pollutants
Adsorption
Sawdust
Protons
Nuclear chemistry
Subjects
Details
- ISSN :
- 03043894
- Volume :
- 139
- Database :
- OpenAIRE
- Journal :
- Journal of Hazardous Materials
- Accession number :
- edsair.doi.dedup.....00a01a8f9d75b304042f067cb7ca56ca