ISSN 0005-2531 (Print) ISSN 2522-1841 (Online)
ADSORPTION STUDY OF ACETONE ON THE SORBENTS BASED ON MONTMORILLONITE
N.A.Imanova, F.M.Sadixov

Corresponding cation forms of the montmorillonite samples taken from the Ag-Dere bentonite deposit were obtained by processing them with  Co2+ and Ni2+ salts. The nature and amount of acid sites formed on the surfaces of the obtained samples were studied by adsorption of acetone using the derivatographic method. The critical diameter of the acetone molecule is  d = 5.6A0  and pkα = -7.2. Analysis of derivatograms shows that the mass loss changes depending on the ionic radius, nature and temperature of the cation exchanges as follows: Co2+ mont> Ni2+ mont> natural mont. Based on the conducted study it was estableshed that there are weak, medium and strong electron-acceptor centers on the surface of the sorbent which differ energetically. The endothermic effect observed on the DTA curve at a temperature range  of 219.3–566.30C  characterizes the physical adsorption of an acetone molecule on the surface of a montmorillonite sample. The effects observed at 706.9  and 775.70C characterize the strong acid sites. The amount of electron-acceptor centers formed on the surface of monmorillonite changes depending on the charge of cation exchangers. The number of electron-acceptor centers formed on the surface of Co2+ bentonite is higher than in other samples. The amount (a.mmol.g) and  desorption energy (E, kDc, mol-1) of acetone molecule desorbed from the active sites in different temperature ranges  were calculated. It was determined that the most capable of adsorbing acetone molecules is Co2+-montimorillonite, which can be used as a sorbent to prevent envoiremental pollution with acetone. Corresponding cation forms of the montmorillonite samples taken from the Ag-Dere bentonite deposit were prepared by processing with  Co2+ and Ni2+ salts. The nature and amount of acid sites formed on the surfaces of the obtained samples were studied by adsorption of acetone using the derivatographic method. Based on the conducted study it was estableshed that there are weak, medium, strong electron-acceptor centers on the surface of the sorbent which differ energetically. The amount (a.mmol.g) and  desorption energy (E, kDc, mol-1) of acetone molecule desorbed from the active sites in different temperature ranges  were calculated. As a result of the research, it was found that the most capable of adsorbing acetone molecules is Co2+-form of montimorillonite, which can be used as a sorbent to prevent envoiremental pollution with acetone

doi.org/10.32737/0005-2531-2022-3-99-104

Keywords : acetone, modification, montmorillonit, acid-base, sorbent
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