KINETICS OF SORPTION CONCENTRATION OF IRON(III) IONS WITH PLANT SORBENT FOR PURIFICATION OF AQUATIC ENVIRONMENTS
Kovalenko Anna Ilinichna - the 4rd year student of chemical faculty, Astrakhan Tatishchev State University named by V.N. Tatischev, 414000, Astrakhan, Shaumyan square, 1, kovalenko09.01@mail.ru
Dzhigola Lyudmila Aleksandrovna - candidate of chemical sciences, associate professor, Head of the Chemiсal Department , Astrakhan State University named by V. N. Tatishchev, 414000, Astrakhan, Shahumyan sq., 1, djegola@mail.ru
Syutova Elizaveta Anatolyevna - Senior Lecturer, Department of Chemistry, Faculty of Pharmacy , Astrakhan State Medical University,
The process of sorption of iron (III) ions by tomato press cake obtained at the production of tomato paste of the agroindustrial complex "Astrakhan" of the Kharabalinsky district of the Astrakhan region is investigated. Kinetic parameters of sorption are determined. The analysis of the integral kinetic curves of adsorption obtained in the temperature range 301-338 K allows us to note that the process is exothermic. Mathematical processing of experimental data was carried out in the coordinates of the Boyd-Adamson equation. The contribution to the overall rate of the process of the chemical interaction stage of the sorbate with the sorbent surface is established, which is confirmed by the agreement between of experimental data and the kinetic model of the pseudo-second order. Due to the rapid establishment of sorption equilibrium, within 10 minutes, the application of the Elovich model for heterogeneous surfaces is difficult. A comparative analysis of the absorption capacity of vegetable sorbents in relation to iron (III) ions allows us to note that the studied sorbent from tomato press cake has a maximum absorption capacity of 47,04 mg/g, sugar beet pulp - 39 mg/g, maple leaf litter – 9,593 mg/g, poplar leaf litter – 7,0 mg/g.
Key words: : natural sorbent, tomato press cake, iron, kinetic models, sorption capacity, pseudo-first order, pseudo-second order, Boyd-Adamson equation, adsorption mechanism, Elovich's model, water purification
