The conversion process of sodium sulfate by electrodialysis with the application of bipolar membranes MB-2 modified with chromium (III) hydroxide has been realized. The investigation of the modified membranes operated under H+ and OH- - ions generation mode in an electrodialysis unit for 50 h of discontinuous operation has revealed the concentration increase of chromium and oxygen at the surface of the test samples, which can be ascribed to chromium (III) hydroxide surface segregation. However, it does not result in major changes of electrochemical properties of the modified membrane. This is confirmed by reproducibility of current-voltage characteristics, by stability of acid current efficiency during exploitation, as well as by minor changes in electrochemical impedance spectrum.The maximum sulfur acid and sodium hydroxide concentrations obtained in the recycling mode of the process of 0.5 mol/dm3 sodium sulfate conversion with the modified membranes application are 0.48 and 1.10 mol/dm3 when the salt solution and acid solutions are put into the unit with varied rate.
In this article the method of the differential scanning calorimetry was realized for a water state assessment in sodium, iron, lanthanum and chromic forms of an ion-exchange fiber VION KN-1. The technique of carrying out the experiment is described. The objects of research were the hemosorbtional fiber VION KN-1. For study of process of dehydration, the fiber was transferred to metal forms with static upholding in solution of salt of the appropriate metal. Initially, the fiber was in the sodium form. Research of process of dehydration of fiber in metal forms was conducted with the synchronous thermal analysis using STA 449 F3, Jupiter, NETZSCH firm in the atmosphere of nitrogen. The temperature program of heat treatment of fiber is presented. The results of the differential scanning calorimetry are also presented in the form of thermoanalytical curves for iron and chromic forms of fiber of VION KN-1. The dependence of amount of sorbed water on the ionic form of fiber is shown. Availability of water of different level of coherence is revealed. Dependence of level of transformation of substance on temperature is calculated. Diagrams of dependence of logarithm of level of transformation of substance on temperature are constructed. The quantitative characteristics of kinetic unequal molecules of water for the initial and metal forms of fiber in the field of limit bloating are shown. In outputs comparing of water state in metal forms of fiber with its state in the sodium form is carried out. Comparison of results of similar researches of metal forms of fiber for ions of trivalent and bivalent metals is carried out. As a result of the conducted researches it was established that the amount of water of different level of coherence in metal forms of carboxyl- containing fiber VION KN-1 is determined by the nature of anti-ions.Forcitation:Niftaliyev S.I., Peregudov Yu.S., Eyvazova Yu.Z., Saranov I.A. Hydration characteristics of KN-1 VION hemosorbtional fibre in sodium, iron, lanthanum and chromic forms. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 2. P. 33-37.
Complexation of scandium 2-hydroxy-5-T-butylphenol-4-metoxyazobenzene (HR) was studied by atomic-absorption and spectrophotometric methods. Optimum conditions of formation and extraction of the complex were found. Maximum light absorbance of a complex in n-butanol is in the range of 470÷480 nm. Molar absorption coefficient equals to (2.2–3.0).104. Stability constant of scandium in n-butanol is л=2.8·1010. Selective and sensitive techniques of extraction-atomic absorption determination of scandium in soils were developed
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