Graduate theses
Current Record: 14 of 1665
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Title |
Σύνθεση της 5,10,15,20-tetrakis (4-carboxyphenyl)-porphyrin cobalt(II) και σύζευξή της με NC-Dots για φωτοκαταλυτική παραγωγή υδρογόνου |
Alternative Title |
Synthesis of the 5,10,15,20-tetrakis (4-carboxyphenyl)-porphyrin cobalt(II)) and coupling with NC-Dots for photocatalytic hydrogen generation |
Author
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Μερτζάνη, Στυλιανή
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Thesis advisor
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Κουτσολέλος, Αθανάσιος
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Abstract |
The rapid development of the modern world, has led to increased energy demands, the
fulfilment of which mainly comes from the burning of fossil fuels. Fossil fuels are described as
non-renewable sources and burning of fossil fuels leads to carbon dioxide emissions. Thus,
the improvident use of fossil fuels led not only to the energy crisis, but to the environmental
crisis as well. Therefore, the scientific world became interested in finding renewable sources,
including which the solar energy stands out due to its abundance. Solar energy is very
important, since it can be used by photocatalytic systems, for the generation of hydrogen.
Nature was a great source of inspiration for this idea, since there are organisms that use solar
energy and convert it into chemical energy in a biological path that is called photosynthesis.
In addition, molecular hydrogen is a very promising type of fuel, since the element of hydrogen
abundant and since its burning is clean and friendly for the environment, due to the fact that
its only product is water. Photocatalytic systems that use solar energy consist of the
photosensitizer (PS), the catalyst (CAT) and the sacrificial electron donor (SED). This bachelor
thesis is about the implementation of such a photocatalytic system, through the synthesis of
the porphyrin CoTCPP and the nanoparticles NC-Dots, that combine to form hybrids that will
act both as photosensitizers and catalysts. Porphyrin CoTCPP, NC-Dots and hybrid NC-Dots-
CoTCPP are characterized by various methods such as: matrix-assisted laser ionization (MADLI-
TOF-MS), UV-Visible absorption spectroscopy (UV-Vis), fluorescence and nuclear magnetic
resonance spectroscopy (NMR). Finally, photocatalytic experiments took place, in which
samples of the hybrids and the NC-Dots alone are studied, in order to specify the importance
of the porphyrin in the ability of the hybrids to act as photosensitizers. It was found that the
porphyrin plays a significant role in the absorption of light by the photosensitizer, since the
samples of the NC-Dots without the porphyrin didn’t generate hydrogen. Gas chromatography
with a thermal conductivity detector (TCD) was used in order to measure the hydrogen
generated by the samples.
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Language |
Greek |
Subject |
Energy crisis |
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Photocatalysis |
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Renewable energy sources |
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Solar energy |
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Ανανεώσιμες πηγές ενέργειας |
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Ενεργειακή κρίση |
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Ηλιακή ενέργεια |
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Πορφυρίνες |
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Φωτοκατάλυση |
Issue date |
2024-07-19 |
Collection
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School/Department--School of Sciences and Engineering--Department of Chemistry--Graduate theses
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Type of Work--Graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/5/d/2/metadata-dlib-1717595724-432419-24555.tkl
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Views |
509 |