Kinetics of the Oxidative Degradation of KU-2×8 Cation-Exchange Resin Using Hydrogen Peroxide
| Autor: | V. F. Markov, M. M. Kozlova, L. N. Maskaeva, M. I. Smol’nikov, S. D. Savinykh |
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| Rok vydání: | 2020 |
| Předmět: |
Chemistry
Kinetics Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Decomposition Copper 0104 chemical sciences Catalysis chemistry.chemical_compound Reaction rate constant Iron(II) sulfate Physical and Theoretical Chemistry 0210 nano-technology Ion-exchange resin Hydrogen peroxide |
| Zdroj: | Russian Journal of Physical Chemistry A. 94:2450-2458 |
| ISSN: | 1531-863X 0036-0244 |
| DOI: | 10.1134/s0036024420120146 |
| Popis: | Kinetics of the oxidative degradation of universal strongly acidic cation-exchange resin KU-2×8 is studied using hydrogen peroxide. The effect the nature and concentration of catalytic additives in the form of copper(II) and iron(II) salts have on the oxidation process is determined. It is found that in noncatalytic degradation, the effective rate constant rises from 0.24 × 10−3 to 7.54 × 10−3 g1/3 min−1 upon an increase in temperature in the range of 348–368 K. The activation energies of the noncatalytic oxidation of the cation-exchange resin with hydrogen peroxide are characteristic of a process that occurs in the kinetic region and total 132.46–141.96 kJ/mol. It is shown that introducing catalytic additives helps lower Ea of the process to 40.90 kJ/mol and the temperature of degradation by 15–25 K. The pattern of change in the surface morphology of the cation-exchange resin granules during oxidative decomposition is revealed. The approximate composition of the products of cation-exchange resin decomposition is identified via gas chromatography–mass spectrometry. |
| Databáze: | OpenAIRE |
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