Actual problems of modern science, education and training

Materials and methods. Analysis of applied materials and research results: In order to study the sorption of Zn (II) and Cr (III) ions into a bead-shaped ion exchange sorbent, it was studied in solutions of different concentrations. For the purpose of studying the sorption of metal ions into anion exchange resins, polyampholyte, the solutions of 0.001, 0.0025, 0.005, 0.0075, 0.01, 0.025, 0.05, 0.075 mole L-1 were
prepared by using a solution with a concentration of 0.1 mole L-1 from water-soluble salts by the method of dilution. 0.2 g of the activated sorbent was put into conical glass flasks, then 100 ml of metal salts were placed on the solution, and the time dependence of the sorption was studied in each solution for 2, 4, 6, 8, 10 h. The analysis was carried out at temperatures of 303K, 313K and 323K based on these concentrations.
Since the colorless solution of the Zn (II) ion is water-soluble salts, it cannot be detected by a UV device. Zn (II) ions were found by using the complexometric titration method to change the concentration of the sorption process. Trilon B or
NaHTr for short is used for titration. Trilon B forms stable internal complex compounds with many anions. In these compounds, the metal ion replaces the hydrogen atom in the carboxyl group and binds to nitrogen in the complex via coordination bonds. For this purpose, 0.05 N Trilon B solution is used. In order to shift the equilibrium towards the formation of a complex compound during titration, a buffer solution (pH-10) and the indicator “erichrome black T” were
used to determine the equivalence point. It is possible to find out how much metal
is absorbed from the difference in the pre- and post-concentration of the solutions of sorption process [6]. Based on the results obtained, the amount of absorbed metal ions in the sorbent PPE-1 and
PPE-1-P was determined by using the following formula.
Here: q_e-the number of ions absorbed into ion exchanger mmol g^-1, C₀- the initial concentration Ce – the equilibrium concentration mmol L^-1; V the volume of solution l; m – the mass of dry sorbent (g).
Pseudo-First-Order Kinetic Model
It is represented by the equation (2) below

log(q_e

• 
  q_t
  

)  logq_e

• 
  ^k1 t
  

2,303

In this equation: q_t and qe - the amount of sorption of metals of the sorbent at a given time and equilibrium (mg g^-1), k₁ - the rate of the firstorder sorption process (min^-1), and the angular value of the intersection slope in the line graph of log(q_e-q_t) and t time is equal to k1 /2,303 [7].
Pseudo-Second-Order Kinetic Model
It is represented by the equation (3) below

t _ 1