Porous carbon materials from Larix Sibirica wastes and Abies Sibirica bark in the sorption of organic pollutants from aqueous solutions

Carbon adsorbents from waste wood processing of Siberian larch and Siberian fir bark were produced by water-steam and gas activation methods in a fluidized bed. The main sorption characteristics of the produced carbon adsorbents were established: the sorption activity for iodine was 60% for larch waste activated carbon and 75% for fir bark activated carbon. The BET surfaces of the larch waste activated coal and the fir bark activated are 331 m²/g and 428 m²/g, respectively. The produced coals have a developed porous structure - pore volume from 1.49 to 2.66 cm³/g. An investigation of the coals activity for the main industrial pollutants - benzene, phenol, petroleum products, formic, acetic and lactic acids, synthetic surfactants (volgonate and katamine AB) - in the concentration range up to 100 mg/l was carried out. Freudlich adsorption isotherms for each coal have been obtained. It was shown that a multi-molecular adsorption increased in the series AB katamine < volgonat < formic acid < oil < lactic acid < acetic acid < benzene < phenol for the char coal samples. At the same time, active coal from fir bark has the highest sorption activity in terms of numerical organic substances, followed by coal from larch processing waste and then industrial coal of the BAU-A. It was found that the adsorption activity of coals from fir bark significantly exceeds the activity of coal grade BAU-A for all mentioned above organic pollutants: with the same efficiency of phenol sorption, the consumption of fir bark coal is less by 3.5-4.3 times; benzene-2.5 - 3.3 times; petroleum products - 11.6 times; volgonate - 2.0 - 2.2 times; katamine AB-1.6 - 2.0 times; formic acid-3.1 - 4.2 times; acetic acid-2.1 - 2.5 times; lactic acid sour-you-2.0 - 2.4 times. The adsorption capacity of industrial coal grade BAU-A for phenol, benzene and oil products was 20 mg/g, 95 mg/g and 85 mg / g, respectively, while for active coal from fir bark, the adsorption capacity for phenol, benzene and petroleum products was 50 mg/ g, 175 mg/g and 140 mg / g, respectively. The feasibility of replacing coal BAU-A with the produced carbon materials in industrial processes of deep sewage treatment has been demonstrated.

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