Effect of Conditions of Carbon Sorbents Producing from Abies Bark on Their Structure and Sorption Properties

Abstract

The ability of producing of effective carbon sorbents from abies bark with the use of thermal alkaline activation in presence of potassium hydroxide was shown. The effects of ratio of bark to alkaline, and temperature of bark pre-carbonization on the porous structure and sorption properties of the carbon sorbents were studied. It was shown, that the capacity of carbon sorbents on iodine is defined by pores with a width 0,73–1,86 nm, on methylene blue – 0,86–2,95 nm, and on vitamin B12 – ≥ 9,31 nm. It was determined, that the carbon sorbent, producing by alkaline activation of product of abies bark carbonization at 400 °С, has a high sorption capacity for studied marker substances. For this sorbent kinetic of iodine, methylene blue and vitamin B12 sorption was studied in comparison with the simple of commercial active coal for medical purposes. It was determined, that this sorbent exceeds the commercial sample in sorption of iodine and vitamin B12 in 1,5 time, and at sorption of methylene blue – in 1.7 time, and it is characterized by a higher rate constants of their markers sorption