A series of different activated carbons of both honeycomb and disc type were prepared by chemical activation of coconut shells with zinc chloride at different concentrations, without the use of a binder. The structures were characterized by N2adsorption at 77 K and scanning electron microscopy (SEM), and also some samples were characterized by immersion calorimetry in benzene. These were subsequently used in the adsorption of phenol in aqueous solution. The experimental results indicat that activation with zinc chloride produced a large development of microporosity with a micropore volume of 0.38 to 0.79 cm3g-1, BET area between 725 and 1523 m2g-1and the capacity to adsorb phenol. In addition, the BET and Langmuir models were applied to isotherm data.
The aim of this research is to synthesise carbon aerogels and to compare the differences in their textural, morphological and chemical properties when synthesised in basic and acidic media, and with two different types of pretreatment carbonization and activation with CO2. Four samples are prepared and characterised using TGA–DTA, SEM, DRX, isotherm determination of N2 adsorption–desorption at −196 °C and immersion calorimetry. The data for pore distribution are reported using non-local density functional theory and quenched solid density functional theory. Finally, with the immersion calorimetry data, the consistency between the results using this technique and those obtained using the nitrogen isotherms is analysed.
This paper reports the preparation and characterization of granular carbon materials those were prepared using chemical activation of African palm stone with ZnCl2 and then chemically modified in order to increase the nitrogen content. Functionalization processes with activated carbons, modify their textural and chemical characteristics, this fact was observed using N2 adsorption at 77 K, Boehm titration, infrared Spectroscopy using immersion calorimeter in liquids with different chemical nature (H2O, C6H6, NaOH and HCl). The results show that the solids obtained have BET surface area and pore volume up to 1200 m 2 /g and 0.44 cm 3 /g, respectively. Immersion enthalpies of samples are between-9.87 and 141.9 J/g. The results show that with the process of functionalization employed in this work, increasing in the nitrogen content and the modification of the adsorbents surface is achieved. Finally, we found that with this activation and modification procedure, the activated carbons produced have a CO2 adsorption capacity until 174 mg CO2 /g.
In this work, we evaluated the adsorption capacity of the metal ions Cd(II), Cr(VI) and Ni(II) from aqueous solution of an organic aerogel, a carbon aerogel and a commercial activated carbon. Aerogel (Ae) was obtained by acid catalysis using HCl, achieving a quick synthesis, then, a
process of carbonization to obtain the carbon aerogel (CAe) was performed. Structural, textural and chemical parameters of the porous solids obtained were characterized by different experimental techniques: scanning electron microscopy (SEM), adsorption isotherms of N2 at 77 K and
CO2 at 273 K, Boehm titrations and pHPZC determination. The three adsorbents were employed in simple adsorption systems of Ni(II), Cd(II) and Cr(VI) from aqueous solution. It was determined that the synthesized aerogel is the material that performed the highest adsorption
capacity of the three metal ions: Ni (32.2 mg g–1) Cd (18.6 mg g–1) and Cr (35.5 mg g–1).
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