Abstract
In this research, the radiation-heterogeneous processes of water decomposition on the surface of zirconium dioxide nanoparticles (n-ZrO2) were studied. The kinetics of buildup of molecular hydrogen during the radiolytic processes of water decomposition was also examined. The production of H2 and H2O2 through water radiolysis was investigated to develop a computational model and disclose the kinetic behavior of water radiolysis. The enthalpy of ZrO2 nanoparticles was studied at the temperature range T=1200-2900 K, in which ZrO2 nanoparticles has a two-phase transition. Some of the electrons were transported to the surface of the nanoparticles during the physical and physicochemical stages of the process and emitted into the water. At the same time, the migration of energy carriers in radioactively active oxide compounds changed at different intervals depending on the composition, structural stability, and electro-physical properties of the oxides.
Highlights
The radiolysis of water results in the production of electrons, atoms, radicals, ions and molecules due to ionizing radiation
Experience has shown that the enthalpy creates three conditional temperature zones that differ in velocity: (I: 1200-1450 K, II: 1450-2650 K, III: 26502900 K)
The change in the growth rate of enthalpy in the temperature range of region II is due to the polymorphic transformation of the tetragonal structure of ZrO2 nanoparticles into a cubic structure. In this regard, when processing the obtained results, it should be noted that in the temperature range TI≤TII≤TIII the ZrO2 nanoparticles consist of a two-phase state, which depend on the temperature
Summary
The radiolysis of water results in the production of electrons, atoms, radicals, ions and molecules due to ionizing radiation. The effective energy transfer distance in radiation-catalytic active oxides is limited by these interval dimensions, which in turn shows the radiationcatalytic activity, which again depends on the particle size [3,4,5,6,7,8]. When using nanoparticle ZrO2 as a construction material, it is necessary to take into account the large number of phase transitions at high temperatures. The amount of molecular hydrogen obtained from radiolysis processes by changing the amount of water (m=0.02, 0.04, 0.06, 0.08 and 0.10 g), its formation rate, and radiation-chemical emissions are studied in the nano-ZrO2/H2O systems with d=20-30 nm particle size under the impact of gamma rays (60Co, Dγ=0.30 Gy/s, T=300 K)
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