Sorption properties of nanostructured potassium aluminosilicate

Гордиенко, П. С.; Yarusova, S. B.; Shabalin, I. A.; Железнов, В. В.; Зарубина, Н. В.; Буланова, С. Б.

doi:10.1134/s1066362214060058

Cited by 11 publications

(6 citation statements)

References 9 publications

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“…It should be noted that the Bronsted acidity in aluminosilicates depends on SiO 2 content and reaches its maximum value at its 70% content [10]. From this point of view, a high content of Bronsted centers in sample N5 containing 56% SiO 2 is explained ( Table 2).…”

Section: Hammett Methodsmentioning

confidence: 85%

“…According to [10], Lewis type acid centers (pK a + 16.80) on the surface of aluminosilicates are formed upon isomorphic substitution of tetravalent silicon in silicon dioxide lattice by trivalent aluminum atoms. Under such conditions, aluminum atom tends to obtain a pair of electrons to fill its p-orbital.…”

Section: Hammett Methodsmentioning

confidence: 99%

“…The largest number of such centers is recorded in sodium aluminosilicates (N1-N3). On the surface of potassium aluminosilicate obtained from RH (N4) the number of acid centers is less, because according to [10] an increase in the radius of cation to a decrease in the intensity of Lewis acid centers. Potassium aluminosilicate obtained from reagents (N5) with a high ratio of Al 2 O 3 :SiO 2 = 1:5 contains the least amount of Lewis acids.…”

Section: Hammett Methodsmentioning

confidence: 99%

“…It is necessary to have a set of experimental data characterizing properties of the surface (composition and structure of surface compounds, physicochemical characteristics) to understand nature and mechanism of processes occurring on the surface of a solid substance and use the results to solve practical problems [9]. One of the main characteristics that most accurately reflects surface reactivity in donor-acceptor interactions is acid-base properties which show almost all fundamental parameters and functional properties of a solid substance [10]. Knowing the composition and content of active centers makes it possible to predict the reactivity and sorption capacity of the surface with respect to pollutants of various nature.…”

Section: Introductionmentioning

confidence: 99%

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Acid-base properties of aluminosilicates from rice husk and straw

et al. 2020

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We obtained aluminosilicates of sodium and potassium from alkaline hydrolysate of rice straw and husk. Chemical, phase composition of the samples was determined, and nature of the functional groups was studied. We presented results of studying acid-base properties of aluminosilicates' surface by pH-metry and Hammett methods. We built distribution curves of a number of acid-base centers of the samples from pК a indicators. It was found that the surface of the asprepared aluminosilicates is characterized by a wider spectrum of Bronsted acid centers (pK a + 2.5; + 3.46; + 6.4), presence of Lewis acid centers (pK a + 16.8) and main Bronsted centers (pK a + 9.45). The largest number of Lewis acid centers was recorded on the surface of sodium aluminosilicates with a narrow ratio of Al 2 O 3 :SiO 2 = 1:2, the smallest-on the surface of potassium aluminosilicate with a wide ratio of Al 2 O 3 :SiO 2 = 1:5. The maximum number of Bronsted acid centers was present on the surface of sodium aluminosilicates from rice straw, the minimum-on the surface of potassium aluminosilicate with the amount of SiO 2 equal to 41%.

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Section: Hammett Methodsmentioning

confidence: 85%

Section: Hammett Methodsmentioning

confidence: 99%

Section: Hammett Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Acid-base properties of aluminosilicates from rice husk and straw

et al. 2020

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“…Radiation pollution of environment with cesium radioisotopes results from both nuclear tests and nuclear power plant accidents as well as emergencies at the enterprises processing and disposing of radioactive waste radionuclides with 46•10 12 Bq [1] were spewed during Windscale nuclear reactor accident. Territories where underground explosionss were conducted both for military and 'peaceful' purposes were contaminated with 137 Cs radioisotopes.…”

Section: Introductionmentioning

confidence: 99%

Sorption Properties of Nanostructured Calcium Aluminosilicate with Respect to Cesium Ions

Гордиенко¹,

Yarusova²,

Shabalin³

et al. 2017

SSP

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Long–lived 134Cs and 137Cs isotopes with half-cycle of 2.06 and 30 years respectively refer to the most dangerous and wide-spread radionuclides in ecological facilities. The efficient way of removing cesium radioisotopes from the living environment is to bind them into the compounds insoluble in water. This paper presents the findings on the sorption properties of synthetic nanostructured calcium aluminosilicates (CAS) with AI:Si correlation equal to 2:2, 2:6, 2:10 and obtained in CaCI2—AICI3—КОН--SiO2—H2O multiple-component system. An isotherm investigation of cesium ion sorption produced from aqueous solution with Cs+1 from 0.2 till 6.0 mmol/L-1 concentration was carried out. Maximum sorption capacity of calcium aluminosilicates (CAS) as well as Langmuir constant was defined. The kinetics data was received and the activation energy of cation exchange in the process of sorption was estimated. The impact of 1% КCI + 6% NaCI saline background on the values of interfacial distribution coefficient (Kd) and recovery rate of cesium ions were determined.

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