Grafting of aminated oligogalacturonans onto Douglas fir barks. A new route for the enhancement of their lead (II) binding capacities

Cédric Astier (1) , Vincent Chaleix (1) , Céline Faugeron (1) , D. Ropartz (2) , Vincent Gloaguen (1) , Pierre Krausz (1)

1 LCSN - Laboratoire de Chimie des Substances Naturelles
2 BIA - Unité de recherche sur les Biopolymères, Interactions Assemblages

Chemical modification of Douglas fir bark and its subsequent utilization in adsorption of PbII from aqueous solutions was investigated. A new approach to enhance the natural properties of bark by covalent grafting of oligogalacturonans was developed. The polysaccharidic moiety of barks was functionalized by periodate oxidation and derivatized after reductive amination in presence of aminated oligogalacturonic acid. PbII adsorption isotherms of derivatized barks were then determined and compared with the capabilities of crude barks using the Langmuir adsorption model in terms of affinity (b) and maximum binding capacities (qmax). Derivatization resulted in significant enhancements of the qmax values (up to ×8), along with little change of the affinity parameter.

Mots clés: Douglas fir barks; Chemical modification; Biosorption; Langmuir isotherm; Lead

Domaines: Chimie; Chimie organique

Cédric Astier, Vincent Chaleix, Céline Faugeron, D. Ropartz, Vincent Gloaguen, et al.. Grafting of aminated oligogalacturonans onto Douglas fir barks. A new route for the enhancement of their lead (II) binding capacities. Journal of Hazardous Materials, 2010, 182 (1-3), pp.279-285. ⟨10.1016/j.jhazmat.2010.06.027⟩. ⟨hal-00697420⟩