The influence of preparation methods and surface properties of activated carbons on Cr(III) adsorption from aqueous solutions

Phenol adsorption onto powdered and granular activated carbon, prepared from Eucalyptus wood

“…Powdered activated carbon was prepared by pyrolysis of eucalyptus wood in continuous N 2 flow in a horizontal tube furnace electrically heated at 773 K following by partial gasification (activation) at 673 K under 100 ml (STP)/min air flux [15]. The powdered activated carbon obtained has a particle size range of 40-50 mesh.…”

“…This behavior is, probably, a consequence of two factors: (a) the blockage of the pores themselves or the blockage of their entry [15], as the carbon granule is formed with clay, water, and binder, and (b) the diluting effect of the clay and CMC, as components of the carbon granule. All these conclusions are supported by the porosity parameters calculated ( Table 2).…”

“…Eucalyptus wood sawdust, the main residue of the Uruguayan wood industry, is a raw material for the preparation of PAC [15,16]. In the present work, the PAC obtained from this material was used for the preparation of GAC, with the addition of a binder, carboxymethyl cellulose, and a reinforcer, kaolin [17].…”

Modern approaches to the production of carbon materials from vegetable biomass

“…Air is used much more rarely [52,53] for the activation of carbon-containing precursors due to its extreme oxidizing activity, which leads to a decrease in the yield of the product not on account of the development of pores but on account of external burning of the semi-coke particles and also leads to difficulty of controlling the activation process. The chief advantages of activation with air are its availability and the autothermic nature of the activation process.…”

Study of the modification mechanism of heavy metal ions adsorbed by biomass-activated carbon doped with a solid nitrogen source

“…The use of strong oxidants for modication at high temperatures not only posed high risks, but also excessively destroyed the original porous structure of activated carbon, resulting in a reduced adsorption capacity. 22,23 In view of the above issues, this study explored the N-doped method of activated carbon using a solid nitrogen source. Dicyandiamide was used as the solid nitrogen source, and the activated carbon substrate was modied by an ultrasonic method and a redox method.…”