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Kinetics of ozone decomposition processes in acidic environment in presence of activated carbon

Wojciech Biernacki

Abstract

Ozone is a reactive allotropic form of oxygen. It is used as oxidant and disinfectant in water and wastewater treatment technologies. However, molecular ozone oxidation potential is too low to mineralize all impurities. To enhance ozone oxidation abilities, it is decomposed into hydroxyl radicals, which are more powerful and more universal oxidants than ozone. One of prospective methods of ozone decomposition is its reaction with surface of activated carbons. This process was extensively studied for decades. Nevertheless, there is still no consensus on its pathway, mechanism, kinetics or even products. Proposed explanations of observed phenomena are various and often contradictory towards each other. Stability of aqueous ozone depends strongly on solutions’ pH, since hydroxyl anions initiate chain of radical reactions leading to ozone decomposition. For this reason, experiments should be conducted at low pHs, minimizing the share of homogenous ozone decomposition in overall process, therefore allowing to focus on surface phenomena. This work is aimed at checking out the doubts found in literature, identifying sources of these doubts and proposing their explanation. A particular attention is paid to ozone decomposition observed kinetics, and how it is affected by changes of experimental parameters. In further perspective it may contribute to better understanding the process of ozone decomposition on surface of activated carbon. In turn, it may help in modelling new water treatment technologies and in designing of new generation of water treatment installations.
Record ID
UAM06cf6cc3b43849228a41158468439264
Diploma type
Doctor of Philosophy
Author
Wojciech Biernacki (SNŚ/WC/FoC) Wojciech Biernacki,,
Title in Polish
Kinetyka procesów rozpadu ozonu w środowisku kwaśnym w obecności węgla aktywnego
Title in English
Kinetics of ozone decomposition processes in acidic environment in presence of activated carbon
Language
pl Polish
Certifying Unit
Faculty of Chemistry (SNŚ/WC/FoC)
Discipline
chemistry / (chemical sciences domain) / (physical sciences)
Scientific discipline (2.0)
6.5 chemical sciences
Defense Date
19-09-2018
End date
19-09-2018
Supervisor
URL
http://hdl.handle.net/10593/23743 opening in a new tab
Keywords in English
ozone decomposition, activated carbon, kinetics, low ph, mechanism
Abstract in English
Ozone is a reactive allotropic form of oxygen. It is used as oxidant and disinfectant in water and wastewater treatment technologies. However, molecular ozone oxidation potential is too low to mineralize all impurities. To enhance ozone oxidation abilities, it is decomposed into hydroxyl radicals, which are more powerful and more universal oxidants than ozone. One of prospective methods of ozone decomposition is its reaction with surface of activated carbons. This process was extensively studied for decades. Nevertheless, there is still no consensus on its pathway, mechanism, kinetics or even products. Proposed explanations of observed phenomena are various and often contradictory towards each other. Stability of aqueous ozone depends strongly on solutions’ pH, since hydroxyl anions initiate chain of radical reactions leading to ozone decomposition. For this reason, experiments should be conducted at low pHs, minimizing the share of homogenous ozone decomposition in overall process, therefore allowing to focus on surface phenomena. This work is aimed at checking out the doubts found in literature, identifying sources of these doubts and proposing their explanation. A particular attention is paid to ozone decomposition observed kinetics, and how it is affected by changes of experimental parameters. In further perspective it may contribute to better understanding the process of ozone decomposition on surface of activated carbon. In turn, it may help in modelling new water treatment technologies and in designing of new generation of water treatment installations.

Uniform Resource Identifier
https://researchportal.amu.edu.pl/info/phd/UAM06cf6cc3b43849228a41158468439264/

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