Treatment and valorisation of the wood by-products. Application to the elimination of the industrial stains.

Treatment and valorisation of the wood by-products. Application to the elimination of the industrial stains. Simple methods to elimination of industrial stains have been carried out, using natural materials such as the sawdust of wood. Two types of stains have been studied: the yellow basic XGL 250% (JB) and the methyl orange (OM). The chemical modification of the sawdust of wood by the grafting of carboxylic functions has been obtained with an excellent yield. These supports have been used for the extraction of the stains in liquid phase. Different studies concerning the kinetics, the capacity, the pH of the solutions and the mass of the support have been carried out. The results show that the rapid kinetic and the extraction yields reached 100% for the JB at basic pH. On the other hand, the OM has been extracted solely at acid pH with a 51% yield. However, for a mixture JB-OM (1:1), the OM has also been adsorbed in basic medium. (C) 2006 Academie des sciences. Publie par Elsevier SAS. Tous droits reserves.