Development of Methods for Obtaining Carbon Adsorbents Based on Angren Coal and Oil Residues


Annotation:

Currently, activated carbon adsorbents are widely used in the world for industrial wastewater treatment from various organic compounds, sorption of heavy metal ions and life-threatening radioactive substances. Carbon adsorbents with hydrophobic properties are mainly modified based on the brown coal, coke, scape, and bark of plants. The methods of manufacturing coal adsorbents based on Angren coal, petroleum coke and asphaltenes are listed. The physicochemical composition and complete thermodynamic properties of the activated carbon adsorbent were studied. It was found that during the heat treatment of mixtures of carbonaceous raw materials, its mass is lost with increasing temperature. At the same time, the adsorption activity of iodine increases with increasing temperature. Depending on the change in temperature of the obtained carbon adsorbent samples, the calculated surface area with respect to iodine is 280.7 m2/g with a weight loss of 0.2 g.
The differential heat of adsorption, isotherm, molar entropy and thermokinetics of the benzene and toluene molecules studied in the article are calculated. The adsorption of 4.5 mmol/g of benzene and 3.5 mmol/g of toluene on the activated carbon adsorbent was determined. It is noted that during the adsorption of benzene and toluene by the obtained adsorbent from activated carbon, the differential heat of reaction gradually decreases.
When recalculating the isothermal adsorption of benzene and toluene on activated carbon according to the equation of the volumetric theory of micropore saturation, it was obtained that 84.5 % of benzene and 94.2 % of toluene were adsorbed on the pores of the adsorbent.

References:
1. Mukhin V.M., Klushin V.N. Production and application of carbon adsorbents: textbook. Moscow: RKhTU, 2012. 305 p. (In Russ.). 
2. On the strategy of actions for the further development of the Republic of Uzbekistan for 2017–2021: Decree of the President of the Republic of Uzbekistan dated February 7, 2017 № PP-4947. Available at: https://lex.uz/docs/3107042 (accessed: January 27, 2023). (In Russ.).
3. On measures to further reform and increase of the investment attractiveness of the chemical industry: Decree of the President of the Republic of Uzbekistan dated June 3, 2019 № PP-4265. Available at: https://lex.uz/docs/4271634 (accessed: January 27, 2023). (In Russ.).
4. Kamenshchikov F.A., Bogomolnyy E.I. Removal of oil products from water surface and soil: textbook. Мoscow: Institut kompyuternykh issledovaniy; Izhevsk: RKhD, 2006. 528 p. (In Russ.).
5. Kudratov A.M. Development of technology for obtaining new types of adsorbents based on the brown coal of the Angren deposit. Gornyy vestnik Uzbekistana = Mountain Bulletin of Uzbekistan. 2006. № 2 (25). pp. 35–40. (In Russ.).
6. Gulomova G.M., Abduraxmonov E.B. Adsorption energy of toluene vapors into an adsorbent obtained on the basis of local angrene coal. Harvard Educational and Scientific Review. 2021. Vol. 1. Iss. 1. pp. 118–128. DOI: 10.5281/zenodo.5670204
7. Adamova L.V., Safronov A.P. Sorption method for studying the porous structure of nanomaterials and the specific surface area of nanosized systems. Ekaterinburg: UrGU im. A.M. Gorkogo, 2008. 62 p. (In Russ.).
8. Mukhin V.M. Environmental aspects of the use of activated coals. Ekologiya i promyshlennost Rossii = Ecology and Industry of Russia. 2014. № 12. pp. 52–56. (In Russ.).
9. Dubinin M.M. Capillary phenomena and information on the porous structure of adsorbents. Sovremennaya teoriya kapillyarnosti (The Modern Theory of Capillarity). Leningrad: Khimiya, 1980. pp. 101–125. (In Russ.).
10. Dubinin M.M. A study of the porous structure of active carbons using a variety of methods. Quarterly Reviews, Chemical Society. 1985. Iss. 2. pp. 101–114. DOI: 10.1039/QR9550900101
11. Gulomova G.M., Abdurakhmonov E.B. Energy of adsorption of benzene vapors with activated carbon. Universum: khimiya i biologiya = Universum: chemistry and biology. 2021. № 11-1 (89). pp. 100–102. 
12. Gulomova G.M. Adsorption of aromatic hydrocarbon with activated angren carbon. Technical science and innovation. 2021. № 3 (9). pp. 67–72.
DOI: 10.24000/0409-2961-2023-3-68-74
Year: 2023
Issue num: March
Keywords : activated carbon adsorbents local coal chemical composition petroleum coke asphaltenes carbon raw materials benzene toluene macropores micropores mesopores
Authors:
  • Gulomova G.M.
    Gulomova G.M.
    PhD (Chem.), Assoc. Prof., gulnora_gulomova83@mail.ru Tashkent State Technical University named after Islam Karimov, Tashkent, Republic of Uzbekistan
  • Shamansurov S.S.
    Shamansurov S.S.
    Cand. Sci. (Eng.), Assoc. Prof., sunnat.shamansurov@rambler.ru Tashkent State Technical University named after Islam Karimov, Tashkent, Republic of Uzbekistan
  • Rakhmatova D.M.
    Rakhmatova D.M.
    PhD (Eng.), Assoc. Prof. Tashkent State Technical University named after Islam Karimov, Tashkent, Republic of Uzbekistan