Production of eco-materials from organic wastes by pyrolysis process

The research objective of this work was to develop eco-materials which can be used in environment depollution. The activated carbons considered as eco-materials have been prepared from rape seeds after the extraction of oil by a slow pyrolysis process. The optimum conditions were an activation temperature of 650 °C, an activation time of 3 h and a nitrogen flow rate of 30 l/h, using steam as activating agent. The prepared activated carbons had a specific surface area of 700-1500 m2/g and a grain bulk density of 0.4-0.8 g/cm3. The physico-chemical characteristics of the carbon active samples were determined using adsorption methods. The carbon adsorbents were chemically modified to have base sites on their surfaces and to investigate the adsorption characteristics of carbon dioxide. Strong interaction between carbon dioxide and base sites enhanced the adsorption of carbon dioxide at temperatures up to 250 °C.