Preparation of TiO2 micro-tubes with a combination of the technique of electrospinning and the method of dip - coating for environmental applications (Master thesis)

Τάτση, Γεωργία


Nowadays, the use of titanium dioxide (TiO2) is becoming increasingly important in photocatalytic reactions and this is reflected in the growing number of publications dealing with theoretical aspects and practical applications in these reactions.The main disadvantage of titanium dioxide (TiO2) is the high energy band gap that allows its activation only under UV irradiation (<400nm), which amount is less than 5% of the intensity of solar radiation reaching the earth.Especially, nano- or microtubes of TiO2 attracted tremendous attention because of their strong oxidizing capability and chemical inertness, rendering them prospective for use in photocatalysis. It has reported that TiO2 nanotubes by themselves do not exhibit high photocatalytic properties although they show high light absorption as well as from their high surface area high adsorption ability.In this thesis, TiO2 tubes were synthesized by the combination of electrospinning and dip – coating method. All samples were studied by the FT – IR, TG – DSC, N2porosimetry, SEM, TEM, XRD, XPS and UV – Vis DRS techniques. The diameter of the prepared TiO2 tubes ranges from 2 to 4 μm and have lower surface area compared to Degussa P25. The prepared samples are consisted of biphasic titania both anatase - rutile (~ 90% anatase) and through XPS and EPR techniques an amount of carbon was detected due to the low calcination temperature (450oC). All samples seem to absorb in the visible light region having lower energy band gap compared to Degussa P25. The photocatalytic activity was tested on the removal of gas NO pollutant and liquid Methylene Blue dye pollutant. The photocatalytic activity of all materials was compared with commercial Degussa P25. A increased oxidation of NO and a limited degradation of Methylene Blue was observed.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Subject classification: Τιτάνιο
Φωτοκατάλυση
Keywords: Μικρό-σωλήνες TiO2,Ηλεκτροστατική ινοποίηση,Επίστρωση με εμβάπτιση,Φωτοκατάλυση,TiO2 micro-tubes,Electrospinning,Dip-Coating,Photocatalysis
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/28046
Appears in Collections:Διατριβές Μεταπτυχιακής Έρευνας (Masters)

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