Actual problems of modern science, education and training

^{ 1 }logC

 
_n e

 

In this (5) equation: qe – the amount of metal absorbed into sorbent of a certain mass (mg mg l^-1), К_F- the Freundlich constant, Се- the equilibrium concentration of the solution (mg l^-1), 1/n – the sorption intensity. The K_F and n (n≈1-10) values
of the Freundlich constants are found by the angular value of the intersection slope on the log C_e with log q_e line graph [12].

Analysis of IR-spectroscopy of polymer-metal complexes

In the study, the laws of absorption and complex formation of intermediate metal ions Co (II), Zn (II), Ni (II), Cr (III) and Cu (II) from artificial solutions to polycomplexes under the same conditions were studied. Also, the stability, structure, composition and properties of the formed polymer-metal coordination compounds were studied using modern physicochemical research methods. In this regard, in order to determine the coordination center of sorbents, which were initially absorbed sorbents Cu²⁺, Co²⁺, Ni²⁺, Cr³⁺, Zn²⁺ ions, IR-spectroscopy analysis was taken [13; 14].

Table 1: IR spectra of complexes formed as a result of PPE-1 and sorption

Compound	υ (NH)	δ (NH)	υ (CH2)	δ(CH2)	Me-N	Me-O
РРЕ-1	3360	1635	1070	1456	-	-
[СrL^13]Cl3	3281	1634	1070	1456	422	-
[CoL^1 ]SO 4 4	3350	1634	1072	1456	422	457
[NiL^14]SO4	3348	1634	1070	1454	409	482
[CuL^1 ]SO 4 4	3340	1634	1072	1454	422	476
[ZnL^14]SO4	3357	1634	1070	1447	419	467

Table 2: IR spectra of complexes formed as a result of PPE-1-P and sorption

Compound	υ (P=O)	υ (NH)	υ (ОН)	δ(CH2)	υ (CH2)	Me-O
РРЕ-1-Р	1298	3281	2120	1457	1072	-
[СrL^23]Cl3	1290	3396	2162	1456	1072	470
[CoL^2 ]SO 4 4	1288	3338	2153	1455	1072	473
[NiL^24]SO4	1291	3304	2127	1455	1077	474
[CuL^2 ]SO 4 4	1274	3305	2142	1458	1085	488
[ZnL^24]SO4	1272	3354	2143	1456	1070	492

^{Figure 1. IR spectra of 1-РРЕ-1 and 2-[NiL1}4^]SO4^.

Quantum chemical calculation of energy and geometric parameters of sorption products. Based on the results of physicochemical analysis to determine the structure, geometric and energy parameters of the obtained molecules, the polymer complex formed by PPE-1 polymer with metals was quantum chemical and the spatial structure, geometric and energy parameters of the molecule were determined [15].
According to all the above methods of physicochemical analysis, the first Z- matrices of molecules were formed, taking into account the formation of coordination through Me-N bonds, and 6 coordination metal for chromium complexes: polymer
=1:3, for copper, nickel, cobalt metals 1:4 and, zinc was estimated to be 1:2 for the metal and the energy and geometric parameters were calculated [16].
In the spatial structure found to be the most optimal for the chromium complex, the metal was bound by the secondary amine group nitrogen, and the chlorides in the metal chloride were found to be on one side and the polymer molecules on the other (Figure 1).
^{Figure 2. The spatial structure of the complex of [CrL1}3^]Cl3 Conclusion. In this study, the process of sorption of Cu(II), Ni(II), Co(II),
Zn(II), Cr(III) ions into PPE-1 anion exchange resin and PPE-1-P polyampholyte
containing amine and phosphite group preservatives, obtained on the basis of local raw materials, was studied in artificial solutions under static conditions. Factors that influence the sorption process, namely time dependence, temperature effect, concentration dependence, were studied. The process of sorption of metal ions into ion exchangers was studied in the Pseudo-First-Order and Pseudo-Second-Order kinetic models, and it was determined by studying the absorption kinetics that the sorption process was the Pseudo-Second-Order Kinetic Model. Sorption of the obtained ion exchangers in artificial solutions preserving Zn (II) and Cr (III) ions at different initial concentrations and temperatures showed that it is subject to the theory of Langmuir monomolecular and Freundlich adsorption.
It was determined that sorption of intermediate metals Cu (II), Ni (II), Co (II), Zn (II), Cr (III) ions of polycomplexes containing amino and phosphonic groups obtained on the basis of local raw materials, their copper (II) and chromium (III) ions were found to be highly selective. The study of polymer-metal complexes, which are sorption products using electronic spectra of IR-spectroscopy and diffuse reflectivity, made it possible to determine their structure, coordination centers and geometry.