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Effect of the acidic treatment on the adsorption and structural properties of the natural mineral sorbent M45C20 |
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| Authors: | L. I. Bel??chinskaya O. V. Voishcheva G. A. Petukhova Lu Thi Ien V. Yu. Khokhlov V. F. Selemenev |
| Affiliation: | 1. Voronezh State Forestry and Technologies Academy, 8 ul. Timiryazeva, 394087, Voronezh, Russian Federation 2. A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Leninsky prosp., 119991, Moscow, Russian Federation 3. Voronezh State University, 1 ul. Universitetskaya, 394006, Voronezh, Russian Federation |
| Abstract: | Adsorption and structural properties of the initial natural mineral sorbent M45C20 and the sorbent treated with 2.33 M H2SO4 were studied. The sorbent mainly consists of montmorillonite and clinoptilolite. Aluminum, calcium, magnesium, sodium, and potassium ions are removed from the structure under the action of the acid. The specific surface, porosity of the sorbent, and pore size increase during this process. The sorption of ammonium ions in the natural samples predominantly follows the ion-exchange mechanism (exchange to calcium, magnesium, sodium, and potassium ions). The acid treatment changes the composition of the cation-exchange complex and results in an increase in the sorption capacity to ammonium ions by a factor of ??1.3. |
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