Structure and Sorption Properties of Activated Carbons Obtained from Pre-Carbonized Cedar Bark

• Published in: Journal of Siberian Federal University. Chemistry Vol. 15; no. 2; pp. 265 - 274
• Main Authors: Ivanov, Ivan P, Veprikova, Evgenia V, Chesnokov, Nikolai V
• Format: Journal Article
• Language: Russian
• Published: Krasnoyarsk Siberian Federal University 01.04.2022
• Subjects: Activated carbon; Bark; Cedar; Cyanocobalamin; Dyes; Heating rate; Iodine; Methylene blue; Pore size; Potassium hydroxides; Sorption; Specific surface; Temperature effects
• ISSN: 1998-2836; 2313-6049
• DOI: 10.17516/1998-2836-0291

The results of a study of the effect of temperature and heating rate in the process of preliminary carbonization of cedar bark on the formation of a porous structure and sorption properties of active carbons obtained by subsequent activation of the carbonizats in the presence of potassium hydroxide are presented. It was determined that active carbon (AC) from cedar bark, carbonized at 300 °C with a heating rate of 10 and 80 °C/min, have the most developed porous structure (specific surface is 1557 and 1606 m2/g, pore volume is 0.71 and 0.89 cm3/g, respectively). It was shown that the sorption activity of obtaining AC regarding iodine is determined by the specific surface area and micropore volume, and the sorption activity of methylene blue - by the mesopore volume. The amount of vitamin B 12 sorption depends with a high approximation accuracy (R2 = 0.966) on the average pore size of AC. The AC produced from cedar bark, carbonized at 300 °C with a heating rate of 10 °/min, is characterized by the maximum sorption of iodine. The AC produced from cedar bark, carbonized at 300 °C with a heating rate of 80 °/min is highly active in sorption of methylene blue and vitamin B12. Sorption properties of AC from cedar bark in relation to the studied marker substances are 1.3-1.9 times higher than commercial active carbon for medical purposes.