Adsorbents from lignin and washed-off petroleum waste

The properties of active carbons, products of the steam activation (400–900°C) of mixtures of washed-off petroleum waste and lignin, were studied. The dependences of the yield, the specific surface area, and adsorption activity with respect to iodine (A _I) and methylene blue (A _MB) on the activation temperature (400–900°C), as well as the characteristics of the pore systems and the parameters of active-carbon supermolecular structure, were obtained. As compared with the properties of active carbon from lignin, the activation of the mixture leads to the formation of active carbon with lower yields, a higher specific surface area, and a substantially (by a factor of 3) increased proportion of mesoporosity. The adsorption properties of active carbons from lignin and its mixture with washed-off petroleum waste are close (A _I = 950?1000 mg/g and (A _MB = 200?220 mg/g).