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Title:Elektrokemijska razgradnja metilen modrega v pretočnem mikroreaktorskem sistemu
Authors:ID Žvarc, Urška (Author)
ID Nemet, Andreja (Mentor) More about this mentor... New window
ID Petrovič, Aleksandra (Comentor)
Files:.pdf VS_Zvarc_Urska_2025.pdf (2,68 MB)
MD5: D2F7A38506C9863FBCD541CD2D2A9CFD
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V diplomskem delu smo preučili elektrokemijski razpad metilen modrega (MB) v pretočnem mikroreaktorskem sistemu, ter porabo električne energije za to analizo. MB je aromatska spojina, ki absorbira svetlobo in se vse pogosteje uporablja v različnih industrijskih panogah. V eksperimentalnem delu smo s spreminjanjem napetosti, pretoka in koncentracije MB ugotavljali kako dani parametri vplivajo na razpad MB. Vpliv parametrov smo proučevali z metodo načrtovanja poskusov, metodo odzivnih površin, centralno kompozitno metodo. Te metode so vgrajene v program Design Expert, ki smo ga uporabljali najprej za načrtovanje poskusov nato pa še za analizo rezultatov, razvoj modela za učinkovitost razgradnje metilen modrega ter optimizacijo pogojev kemijske reakcije. Za izvedbo poskusa elektrokemijskega razpada smo uporabili elektrokemijski pretočni mikroreaktorski sistem, pri čemer smo kot katodo uporabili ogljikovo elektrodo, kot anodo pa elektrodo nerjavečega jekla. Ugotovili smo, da je učinkovitost razpada pri nizkih koncentracijah MB zelo nizka, ne glede na napetost in pretok. Učinkovitost razpada višjih koncentracij MB je najboljša pri napetosti med 4,9 V in 6 V ter pri pretoku 1,63 mL/min. Vzporedno smo izvedli še študijo porabe električne energije, s katero smo ugotovili, da se tok električne energije ni znatno spreminjal ne za črpalko in tudi ne za elektrokemijski modul. Do razlik je prišlo zaradi različnih zadrževalnih časov, in sicer daljši kot je bil zadrževalni čas večja je bila poraba električne energije. Rezultati so pokazali, da so bili eksperimentalni podatki skladni s teoretičnimi napovedmi, kar potrjuje, da je metoda uporabna za čiščenje vodnih raztopin onesnaženih z MB.
Keywords:Metilen modro, mikroreaktorski sistem, elektrokemijski razpad, napetost, pretok
Place of publishing:Maribor
Publisher:[U. Žvarc]
Year of publishing:2025
PID:20.500.12556/DKUM-94949 New window
UDC:66.092.087:547.869(043.2)
COBISS.SI-ID:21657 New window
Publication date in DKUM:18.09.2025
Views:138
Downloads:28
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:29.08.2025

Secondary language

Language:English
Title:Electrochemical degradation of methylene blue in a flow microreactor system
Abstract:This thesis presents the electrochemical degradation of methylene blue (MB) in a continuous-flow microreactor system, as well as the associated electrical energy consumption for this process. MB is an aromatic compound that absorbs light and is increasingly used across various industries. In the experimental part, we investigated how variations in voltage, flow rate, and MB concentration influence the degradation of MB. The effects of these parameters were studied using the design of experiments methodology, the response surface method and the central composite design. These methods are integrated into the Design Expert software which was firstly used for experiment planning and then later on for the data analysis, model development of MB degradation efficiency and optimization of the reaction conditions. For the electrochemical degradation experiments, we employed an electrochemical continuous-flow microreactor system, where a carbon electrode was used as the cathode and a stainless steel electrode as the anode. It was found that the degradation efficiency at low MB concentrations was very low, regardless of voltage and flow rate. For higher MB concentrations, the degradation efficiency was optimal at voltages between 4,9 V and 6 V and at a flow rate of 1,63 mL/min. In parallel, we conducted a study on the electrical energy consumption for the analysis itself, with which we determined that the flow rate of electric eenrgy did not change much, neither for the pump nor the electrochemical module. The encountered differences were caused by the varying retention times, where the longer the retention time was the longer was the consumotuin of electrical energy. The results showed that the practical outcomes were very close to the theoretical predictions, thus confirming that the method is suitable for the removal of water solutions polluted with MB.
Keywords:Methylene blue, microreactor system, electrochemical degradation, voltage, flow rate


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