Use of ion-exchange fiber at the purification stage of wastewater of electroplating

In the electroplating industry, large volumes of water are used, which are polluted at various stages in the process. Waste water containing transition metal ions is not only a dangerous source of environmental pollution, but also valuable waste. Taking into account the problems associated with the ecology and the rational use of natural resources, it is necessary to create low- and non-waste production, in particular, to develop new technological processes and appropriate equipment, to introduce water-circulation cycles. This paper presents the results of a study of the sorption of copper (II) and nickel (II) cations by the FIBAN X-1 ion exchange fiber. Calorimetric studies of the thermal effects of the interaction of FIBAN X-1 fiber with solutions of copper (II) and nickel (II) nitrates were carried out. It is shown that the power, thermal effect and time of the process depend on the nature and concentration of metal ions in the solution. Based on the experimental data, the enthalpy of the process was calculated. The endothermic effect of the process is explained by the energy costs associated with dehydration effects and changes in the conformation of the polymer fiber chains. Sorption isotherms of these ions were obtained. It has been established that at all concentrations studied, Ni2 + ions under these conditions are absorbed by ion exchange fibers better than Cu2 + cations. The calculated sorption constants for copper (II) and nickel (II) are greater than 1. It is shown that the Langmuir equation describes the sorption isotherm better than the Freundlich equation. For deep purification of waste water from metal ions, it was proposed to use the fibrous sorbent FIBAN X-1.

HYDRATION CHARACTERISTICS OF KN-1 VION HEMOSORBTIONAL FIBRE IN SODIUM, IRON, LANTHANUM AND CHROMIC FORMS

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.