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Study of ozone decomposition on solid surfaces
Krejsková, Eliška ; Stančík, Jiří (referee) ; Kozáková, Zdenka (advisor)
This bachelor’s thesis is focused on the study of ozone decomposition which occurs during its contact with solid surfaces. The aim is to find out which material causes the lowest ozone decomposition and that is why it is the most suitable material for pipelines used for ozone transportation from a place of production to a place of application. In the theoretical part important properties of ozone, possibilities of its production, methods of ozone determination and relation of ozone to different solid surfaces were described. In the experimental part there was investigated how much ozone is decomposed by five commonly available metal materials (stainless steel, yellow brass, copper, aluminium and iron). Measurements were realized in the glass tube (Liebig condenser). Hollow pipes made of particular material were inserted into this tube. Ozone passed through this glass tube and ozone concentration was determined on its output by two methods: the iodometric titration and spectrophotometry. Several series were measured and compared by different set-up conditions like reaction time, experimental parameters (flow rate of air, input power of the ozone generator) and two types of gas – technical and synthetic air (because moisture contained in technical air can cause ozone decomposition) were used. The most suitable materials – stainless steel and aluminium were determined according to gained results.
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Generation of ozone by photochemical processes in O2 and admixtures
Tomečková, Klára ; Blahová, Lucie (referee) ; Mazánková, Věra (advisor)
Ozone is a toxic gas with the fatal impact to living organisms at high concentrations. Therefore, this gas is useful in sterilization in many cases. The subject of this work is the generation of ozone using various methods and determination of its concentration. Then the generated ozone can be used in ozone therapy. The theoretical part deals with properties and use of ozone. In addition, information gathering connected to ozone was performed. It was about methods of ozone generation and subsequently about the diagnostics determine of ozone concentration. In the experimental part the ozone generation and determination of its concentration was performed using spectrophotometric method and iodometric titration. The ozone concentration in the air was also measured over the long term using the Schönbein method.
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Determination of the ozone concentration generated by dielectric barrier discharge.
Manduchová, Ivana ; Töröková, Lucie (referee) ; Mazánková, Věra (advisor)
The bachelor´s thesis is focused on the study of determination of the ozone concentration generated by dielectric barrier discharge from high-purity oxygen gas of 99,999 9 %, at changes in different experimental conditions, using absorption spectrometry. The emphasis was put also equally on the comparison of two representatives of the basic methods determining the concentration of ozone. In the theoretical part are described characteristic properties of ozone and fields of utilization, methods of ozone generation, experimental methods of determining the concentration of generated ozone and microbicidal effects of ozone. In the experimental part was investigated the generation of ozone created by interaction of oxygen with oxygen adsorbed on the walls of ozonizer depending on variation of experimental conditions. Multiple series of experiments were conducted, where the changing variable of experimental conditions was the change of voltage on power supply, the flow change of oxygen and the change of reaction time period. Besides of these, there has been also examined the applicability of determining the concentration of ozone using iodometric titration in comparison with the method of UV absorption at conditions used in the experiment. Ozone was generated by assembly of two identical cylindrical ozonizers made from stainless steel functioning on principle of dielectric barrier discharge using dielectric from alumina.
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Influence of surface electrodes on the ozone generation in the dielectric barrier discharge.
Mierna, Jana ; Dzik, Petr (referee) ; Mazánková, Věra (advisor)
The bachelor´s thesis is focused on the study of influence of adsorbed gases on the electrode surface on ozone generation in dielectric barrier discharge. The theoretical part describes some basic properties and applications of ozone, methods of its generation, determination and interaction with the solid surfaces. In the experimental part was studied formation of ozone by the recombination of molecules and atoms of oxygen on the wall of electrodes and also its destruction caused by the reaction with particles present in closed ozoniser without discharge. Ozone was generated in cylindrical configuration system of electrodes made of staniless steel and alumina ceramics as dielectric material. Several series of experiments were measured by using various operating gases (oxygen; oxygen and argon; oxygen and nitrogen). It was also examined the decrease of generated ozone concentration in long-term operation by using pure oxygen of 99,999 90 % as a feeding gas. The resulting ozone concentration for given reaction time of individual measurements was determined by the method of absorption spectrometry.
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Generation of ozone by photochemical processes in O2 and admixtures
Tomečková, Klára ; Blahová, Lucie (referee) ; Mazánková, Věra (advisor)
Ozone is a toxic gas with the fatal impact to living organisms at high concentrations. Therefore, this gas is useful in sterilization in many cases. The subject of this work is the generation of ozone using various methods and determination of its concentration. Then the generated ozone can be used in ozone therapy. The theoretical part deals with properties and use of ozone. In addition, information gathering connected to ozone was performed. It was about methods of ozone generation and subsequently about the diagnostics determine of ozone concentration. In the experimental part the ozone generation and determination of its concentration was performed using spectrophotometric method and iodometric titration. The ozone concentration in the air was also measured over the long term using the Schönbein method.
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Determination of the ozone concentration generated by dielectric barrier discharge.
Manduchová, Ivana ; Töröková, Lucie (referee) ; Mazánková, Věra (advisor)
The bachelor´s thesis is focused on the study of determination of the ozone concentration generated by dielectric barrier discharge from high-purity oxygen gas of 99,999 9 %, at changes in different experimental conditions, using absorption spectrometry. The emphasis was put also equally on the comparison of two representatives of the basic methods determining the concentration of ozone. In the theoretical part are described characteristic properties of ozone and fields of utilization, methods of ozone generation, experimental methods of determining the concentration of generated ozone and microbicidal effects of ozone. In the experimental part was investigated the generation of ozone created by interaction of oxygen with oxygen adsorbed on the walls of ozonizer depending on variation of experimental conditions. Multiple series of experiments were conducted, where the changing variable of experimental conditions was the change of voltage on power supply, the flow change of oxygen and the change of reaction time period. Besides of these, there has been also examined the applicability of determining the concentration of ozone using iodometric titration in comparison with the method of UV absorption at conditions used in the experiment. Ozone was generated by assembly of two identical cylindrical ozonizers made from stainless steel functioning on principle of dielectric barrier discharge using dielectric from alumina.
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Influence of surface electrodes on the ozone generation in the dielectric barrier discharge.
Mierna, Jana ; Dzik, Petr (referee) ; Mazánková, Věra (advisor)
The bachelor´s thesis is focused on the study of influence of adsorbed gases on the electrode surface on ozone generation in dielectric barrier discharge. The theoretical part describes some basic properties and applications of ozone, methods of its generation, determination and interaction with the solid surfaces. In the experimental part was studied formation of ozone by the recombination of molecules and atoms of oxygen on the wall of electrodes and also its destruction caused by the reaction with particles present in closed ozoniser without discharge. Ozone was generated in cylindrical configuration system of electrodes made of staniless steel and alumina ceramics as dielectric material. Several series of experiments were measured by using various operating gases (oxygen; oxygen and argon; oxygen and nitrogen). It was also examined the decrease of generated ozone concentration in long-term operation by using pure oxygen of 99,999 90 % as a feeding gas. The resulting ozone concentration for given reaction time of individual measurements was determined by the method of absorption spectrometry.
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Study of ozone decomposition on solid surfaces
Krejsková, Eliška ; Stančík, Jiří (referee) ; Kozáková, Zdenka (advisor)
This bachelor’s thesis is focused on the study of ozone decomposition which occurs during its contact with solid surfaces. The aim is to find out which material causes the lowest ozone decomposition and that is why it is the most suitable material for pipelines used for ozone transportation from a place of production to a place of application. In the theoretical part important properties of ozone, possibilities of its production, methods of ozone determination and relation of ozone to different solid surfaces were described. In the experimental part there was investigated how much ozone is decomposed by five commonly available metal materials (stainless steel, yellow brass, copper, aluminium and iron). Measurements were realized in the glass tube (Liebig condenser). Hollow pipes made of particular material were inserted into this tube. Ozone passed through this glass tube and ozone concentration was determined on its output by two methods: the iodometric titration and spectrophotometry. Several series were measured and compared by different set-up conditions like reaction time, experimental parameters (flow rate of air, input power of the ozone generator) and two types of gas – technical and synthetic air (because moisture contained in technical air can cause ozone decomposition) were used. The most suitable materials – stainless steel and aluminium were determined according to gained results.
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