Linked Life Data

16423721

Source:http://linkedlifedata.com/resource/pubmed/id/16423721

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2006-1-20
pubmed:abstractText
The chemical mechanism displayed in the sorption of heavy metal cations on barks was discussed through a modelling study of adsorption in relation to the nature of the ligand borne by the chemical components of the bark sorbent. The adsorption isotherms of five heavy metal cations (Cr3 +, Cu2 +, Ni2 +, Pb2 +, Zn2+) on five species of barks (Sweet chestnut, Oak, Douglas fir, Norway spruce, Scots pine species) were studied. The experimental data fitted well the Langmuir model, which allowed the expression of the mathematical parameters (qmax, maximum binding capacity; b, affinity). The qmax values increased conversely to the b values. The correlation of these mathematical values (qmax and b) with the analysis of the chemical composition of barks led us to note that Cu2 + interacts preferentially with phenolic groups present in lignins and tannins and, opposite in, Pb2 + with the carboxylic acid groups in polysaccharides. These observations were explained (i) quantitatively by the amount of different types of sites and (ii) qualitatively, by the physicochemical characteristics of cations, the nature and the tridimensional structure of adsorption sites. Finally, the results allowed to define the nature of the chemical interaction (monodentate or multidentate complex) between each specified chemical component of barks and each kind of heavy metal cations.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1093-4529
pubmed:author
pubmed:issnType
Print
pubmed:volume
41
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
149-60
pubmed:dateRevised
2009-8-14
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Study of the chemical interaction between barks and heavy metal cations in the sorption process.
pubmed:affiliation
Laboratoire de Chimie des Substances Naturelles, Faculté des Sciences et Techniques, Université de Limoges, Limoges, France.
pubmed:publicationType
Journal Article, Comparative Study