scholarly journals Preparation of spheres based on NiO using cation with gel and macroporous structure

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 97-102
Author(s):  
E. A. Zhilyakova ◽  
◽  
O. S. Khalipova ◽  
V. V. Kozik ◽  
◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Surface Morphology ◽  
Nickel Oxide ◽  
Thermal Destruction ◽  
Cation Exchanger ◽  
Macroporous Structure ◽  
Inhomogeneous Surface ◽  
Temperature Regimes ◽  
Cation Exchangers

The article discusses the production of materials based on nickel oxide in the form of spherical granules ranging in size from 300 to 700 nm, by the method of thermal destruction of cation exchangers with gel (TOKEM-100)and macroporous (TOKEM-250) structures saturated with nickel (II) ions. Thermal analysis was used to establish the temperature regimes of annealing of Ni2+–ТОКЕМ-250 и Ni2+–ТОКЕМ-100 samples. The prepared materials were investigated by XRD and SEM. The use of TOKEM-100 cation exchanger makes it possible to obtain samples with spherical granules based on trigonal nickel (II) oxide, characterized by a sintered surface morphology. The use of TOKEM-250 cation exchanger leads to the formation of spheres based on NiO cubic modification with an inhomogeneous surface morphology.

Sorption of Cobalt(II) and Copper(II) Ions by Highly Cross-Linked Carboxyl Cation Exchangers from Natural Waters with High Salt Background

2015 ◽  
Vol 1085 ◽  
pp. 68-73 ◽  
Author(s):  
Valentina V. Zharkova ◽  
Lyudmila A. Bobkova ◽  
Camilla A. Bektimirova ◽  
Vladimir Kozik
Keyword(s):  
Natural Waters ◽  
Cation Exchanger ◽  
High Salt ◽  
Background Concentration ◽  
Gel Structure ◽  
Ion Sorption ◽  
Cation Exchangers ◽  
Static Conditions ◽  
Indicator Tubes ◽  
Background Electrolytes

The equilibrium and dynamics of sorption of Co2+ and Cu2+ ions have been investigated on highly cross-linked carboxyl cation exchangers of gel (KB-125P) and macroreticular (KB-2E-10) structure from solutions with an ionic strength of 0.1 and 1. It has been established that there is a weak effect of salt background concentration on selectivity of ion sorption in static conditions. In dynamic conditions with increased levels of background electrolytes, there is a decrease in the degree of ion exchanger layer KB-2E-10, which indicates a decrease in the selectivity of sorption. For the cation exchanger KB-125P, on the contrary, there is an increase in the degree of the layer use. It has been concluded that the gel structure of the sorbent KB-125P provides selective sorption of Co2+ and Cu2+ ions from solutions with high salt background. Coloring of cation exchangers layer KB-125P and KB-2E-10 in the absorption of Cu2+ and Co2+ makes it possible to create effective indicator tubes on their basis.

scholarly journals Thermokinetic parameters of the primary coal tars destruction in the presence of catalysts and polymeric materials

2021 ◽  
Vol 102 (2) ◽  
pp. 89-95
Author(s):  
N.Zh. Balpanova ◽  
◽  
M.I. Baikenov ◽  
A.M. Gyulmaliev ◽  
Z.B. Absat ◽  
...  
Keyword(s):  
Activation Energy ◽  
Nickel Oxide ◽  
Rate Constant ◽  
Thermal Destruction ◽  
Coal Tar ◽  
Magnetic Microspheres ◽  
Thermokinetic Parameters ◽  
Isothermal Kinetics ◽  
Organic Mass ◽  
Oxide Particles

The hydrogen-donor abilities of polymers and the activity of catalysts in the process of thermal destruction of the organic mass of primary coal tar (PCT) are studied by non-isothermal kinetics methods. PCT,magnetic microspheres, nickel-deposited chrysotilechrysotile and Fe3O4nanocatalysts were used as initial raw materials. Рolymers such as polyethylene (PE), polystyrene(PS) and polyethylene glycol (PEG) were selected as a hy-drogen donor. The phases Mg3[OH]4{Si2O5} and NiO were determined by X-ray phase analysis (XRD) in the obtained catalyst (nickel-deposited chrysotile), and the presence of highly dispersed nickel oxide particles on the surface and inside the nanotubes was shown by the transmission electron microscope (TEM). Nickel oxide particles of 8–11 nmand 30–37 nmwere evenly distributed on the surface and inside the chrysotile nanotubes. The kinetic parameters of the thermal destruction of a mixture of PCT, catalyst and polymer material were determined on the basis of thermogravimetric analysis using the integral method and the method for determin-ing the thermokinetic parameters by the inflection point on the thermogravimetric curve(TG). The change in the activation energy, rate constant and pre-exponential factor with an increase in the degree of destruction of the organic mass of the PCT is established. It was shown that the nature of polymers and catalysts significantly affects the value of the rate constant and the activation energy. The calculated activation energies of the thermal destruction of a mixture of coal tar with PS and PE in the presence of a catalyst (nickel-deposited chrysotile) by the first method are 47.6 kJ/mol and 40.4 kJ/mol, and by the second method are 47.3 kJ/mol and 86.5kJ/mol respectively.

scholarly journals STUDY OF THE EFFICIENCY OF SORPTION TREATMENT WATER FROM AMMONIUM IONS ON NATURAL AND ARTIFICIAL SORBENTS

2017 ◽  
pp. 42-48
Author(s):  
I.N. Makarenko ◽  
I.N. Trus ◽  
A.I. Petrychenko ◽  
A.Yu. Kiichenko
Keyword(s):  
Calcium Ions ◽  
Cation Exchanger ◽  
Tap Water ◽  
Acid Solutions ◽  
Ammonium Ions ◽  
Ion Concentrations ◽  
Model Solutions ◽  
Hydrochloric Acid Solutions ◽  
Cation Exchangers ◽  
Acid Cation

It was studied processes of ion-exchange water purification from ammonium ions from model solutions on cation exchangers and on zeolite. It was established dependencies ammonium sorption on the form of ion exchanger, the ratio of ammonium and calcium in water and the level of ion concentrations in solution. It was shown that the strongly acid cation exchanger KU-2-8 in Na+-form has a low selectivity for ammonium ions, in comparison with the H+-form. It was established that the sorption efficiency of ammonium ions on cation exchangers KU-2-8 and Dowex Mac-3 decreases in the presence of calcium ions. It was determined that regeneration of cation exchanger KU-2-8 was more effective when hydrochloric acid solutions were used. It was shown that ammonium sorption on zeolite from tap water goes in the same way as from model solutions. It was determined the boundary capacity of the zeolite for ammonium ions and it was amounted 40 mg/g. The regeneration of zeolite with a sodium chloride solution was investigated and it was established that the degree of regeneration reached 100 %. Bibl. 16, Fig. 6, Tab. 1.

Strain relaxation and surface morphology of nickel oxide nanolayers

2006 ◽  
Vol 600 (5) ◽  
pp. 1099-1106 ◽  
Author(s):  
J. Schoiswohl ◽  
W. Zheng ◽  
S. Surnev ◽  
M.G. Ramsey ◽  
G. Granozzi ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Nickel Oxide ◽  
Strain Relaxation
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