STUDY OF THE PROPERTIES OF ACTIVE CARBON FABRIC AND A CHEMOSORBENT BASED ON IT FOR AMMONIA ABSORPTION

The work is devoted to the study of the properties of active carbon fabric as a carrier of a chemisorbent for ammonia adsorption. Studies of the porous structure of active carbon fabric were carried out, as a result of which it was found that it has a developed pore system. The total pore volume of the active carbon fabric sample is 1.3 cm3/g, wherein the sorption pores content is 38% and the percentage of micropores in the volume of sorption pores is 88%. Active carbon fabric is shown to have hydrophobic properties. The active carbon fabric was impregnated with copper (II) salts in order to obtain a chemisorbent for adsorbing ammonia. When copper (II) sulfate is applied to active carbon fabric, crystallization of the additive occurs on its surface, which leads to partial blocking of the sorption pores (the decrease in the volume of sorption pores was 29.2%). On the surface of the active carbon fabric, crystallites of copper (II) sulfate are formed, the sizes of which are in a fairly wide range (1.29-746 μm). Crystallites of copper (II) chloride, when applied to the surface of active carbon fabric, partially fill micro- and mesopores, the decrease in the volume of micropores reached 39.6%. It was found that mainly when applying the additive, the pore volume changes with a half-width gap of 0.52-0.77 nm and 1.10-1.40 nm. The equilibrium ammonia adsorption capacity of chemisorbents was determined under static conditions. Chemisorbent with copper (II) chloride additive is shown to have the highest equilibrium capacity. The equilibrium ammonia capacity of chemisorbents mainly depends on the availability of the surface of the active carbon fabric (AСF) sorption space for ammonia molecules. For citation: Farberova E.A., Chashchina E.V., Smirnov S.A., Pershin E.A., Khodyashev N.B., Tin’gaeva E.A. Study of the properties of active carbon fabric and a chemosorbent based on it for ammonia absorption. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 3. P. 95-103. DOI: 10.6060/ivkkt.20256803.7120.