Funct. Mater. 2023; 30 (4): 511-518.

doi:https://doi.org/10.15407/fm30.04.511

Structural and morphological changes in FeCl3-modified carbon material

V.M. Vashchynskyi, I.V. Semkiv, M.V. Solovyov, H.A. Ilchuk

Lviv Polytechnic National University, 12 S.Bandery Str., Lviv, 79013, Ukraine

Abstract: 

The work describes the three-step modification process including 1) impregnation of the carbon-containing precursor with FeCl3; 2) heat treatment in an argon atmosphere at 700C; 3) washing with distilled water and drying of samples to remove the residual activating agents and by-products of the reaction. The characteristics of carbon such as porosity, the chemical composition of the surface, and sorption properties have been thoroughly analyzed. The features of the formation of inclusions on the surface of the original carbon material СSTR-08 have been investigated using scanning electron microscopy, and their nature has been established. The main parameters of the specific surface, namely the total surface area, the total volume, and the average pore radius were determined by the methods of adsorption porosimetry and small-angle X-ray scattering. It has been found that the FeCl3 modification of the carbon material leads to a three-fold increase in the material density and an increase in the number of pores with a radius of 25-50Å. The high specific surface area (S =1875 m2/g) allows the FeCl3-modified material to be used as a favorable adsorbent in the aqueous phase, and the presence of stable and well-dispersed iron species on the carbon surface makes it a promising catalyst.

Keywords: 
porous carbon material; chemical activation; iron chloride; pore radius.

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