Structural and sorption properties of nanoporous carbon materials obtained from walnut shells

S.A. Lisovska; R.V. Ilnytskyy; R.P. Lisovskyy; N.Ya. Ivanichok; Kh.V. Bandura; B.I. Rachiy

doi:10.15330/pcss.24.2.348-353

Authors

S.A. Lisovska Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine; Ivano-Frankivsk National Medical University, Ivano-Frankivsk, Ukraine
R.V. Ilnytskyy Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
R.P. Lisovskyy Ivano-Frankivsk National Medical University, Ivano-Frankivsk, Ukraine; Joint Educational and Scientific Laboratory for Physics of Magnetic Films of G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine and Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
N.Ya. Ivanichok Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine; Joint Educational and Scientific Laboratory for Physics of Magnetic Films of G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine and Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
Kh.V. Bandura Ivano-Frankivsk National Medical University, Ivano-Frankivsk, Ukraine
B.I. Rachiy Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine

DOI:

https://doi.org/10.15330/pcss.24.2.348-353

Keywords:

nanoporous carbon material, thermochemical activation, specific surface area, pore size distribution, specific electrical conductivity

Abstract

Using the method of low-temperature nitrogen adsorption/desorption, the porous structure of nanoporous carbon materials obtained by alkaline activation of light industry waste (walnut shells) with subsequent thermal modification was investigated. The optimal relationship between temperature and modification time has been established. It is shown that an increase in the modification temperature reduces the transition time of micropores into mesopores and leads to a decrease in the specific surface area and total pore volume. Thus, the material obtained at a modification temperature of 400 ºC and a holding time of 120 min is characterized by the maximum specific surface area of 940 m²/g. It has been investigated that an increase in the time of temperature modification leads to an increase in specific electrical conductivity.

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