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Home Μελέτη της φωτοκαταλυτικής δραστικότητας εμπλουτισμένων νανοδομικών υλικών, με βάση το TiO2 και το ZnO, μέσω της αποικόδομησης αέριας ακεταλδεΰδης

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Identifier

000410471

Title

Μελέτη της φωτοκαταλυτικής δραστικότητας εμπλουτισμένων νανοδομικών υλικών, με βάση το TiO2 και το ZnO, μέσω της αποικόδομησης αέριας ακεταλδεΰδης

Alternative Title

Study of the photoatalytic reactivity of doped nanostructured materials, based on TiO2 and ZnO, through the degradation of gaseous acetaldehyde

Author

Παναγιωτάκη, Αικατερίνη Δ.

Thesis advisor

Φρουδάκης, Γεώργιος Ε.

Reviewer

Μήλιος, Κωνσταντίνος
Κυριακίδης, Γεώργιος
Παπαδημητρίου, Βασίλειος Χ

Abstract

During the course of the present Master Thesis,ultraviolet (UV) and visible (Vis) induced photocatalytic activity of a series of synthesized nanostructured materials, based on TiO₃, SrTiO₃ and ZnO, functionalized with transition metals (Fe, Co, Mn, Cu, Cd, Cr), was studied. Those potent photocatalysts are aimed to be used as energy saving building materials and paints additives, to combat indoor and outdoor environmental pollution. The experimental setup used in the present study was the Photochemical Static Reactor coupled with on-line Fourrier Transform InfraRed Spectroscopy (PSR/FTIR), for qualitative and quantitative reactants and volatile products analysis. Acetaldehyde, CH₃CHO, was the main volatile organic compound, selected to be tested as pollutant, due to its high abundance in both indoor and outdoor environment. UV and Vis Photocatalitic efficiency of the selected nanostructured materials was investigated monitoring the induced CH₃CHO degradation. In addition to that the kinetics of the processes as well as the end-products formation and the corresponding yields, were determined. Moreover, the metal kind and its mixing ratio impact on the photocatalytic efficiency, for the titled nanostructured materials was studied. 0.02% Fe/TiO₂ and 0.04% Mn/Co-TiO₂showed the highest UV induced photocatalytic efficiency resulting in CO₂ and H₂O, as sole end-products. However, it is worth noting that the non-environmentally friendly CO was also identified as end-product, in some cases. End-products conversion yield was measured for all the different photocatalysts studied in the present work. 0.25% Co/ZnO, 0.04% Mn/TiO₂ and 0.04% Mn/TiO₂ doped with high OH levels were the only nanostructured materialsthat induce the photocatalytic degradation of the studied pollutant, under visible light irradiation conditions. It is even more important to note that CO₂ and H₂O were detected as sole end-products, since the maximum yield of toxic CO<3%, according to the detection limit of the technique used, demonstrating that these materials are prominent additives to be used for cleaning indoor environment, since they have less impact to the air toxicity.

Language

Greek

Subject

Indoor and outdoor environmental clean-up

Infrared Spectroscopy

Photocatalysis

Απορρύπανση εξωτερικών και εσωτερικών χώρων

Νανοδομικά υλικά

Φασματοσκοπία Υπερύθρου

Φωτοκατάλυση

Issue date

2017-07-21