Michał Pacia has got his PhD degree. Congratulations!
Activation of O2, H2O and H2O2 in photoinduced electron transfer processes.
As part of the dissertation research was carried to recognize various aspects of activation of the O2, H2O and H2O2 presence of TiO2 materials. In the case of anatase and rutile the influence of O2 and H2O2 presence on ROS generation in the irradiated system was determined. It was proven that rutile, compared to anatase, performs better in both O2 and H2O2 reduction. The influence of the exposed crystal facets on redox properties of materials were also investigated. The facets were put in an order (101) > (100) > (001) according to their activity in the H2O2 activation via reduction. Monocrystalline rutile materials, with exposed(110), (101) or (001) facets were also tested. The next step involved tests on surface modified TiO2 materials. Proper approach to determining the EBG in the case of surface modified materials was established. Activity of materials modified with organic compounds coordinating to the surface of TiO2 was tested. Additionally, a series of other semiconductors were investigated in terms of H2O and H2O2 activation properties. One of the crucial parts of this work was to verify the suitability of available ROS detection and determination methods in the systems containing heterogeneous photocatalysts. Weaknesses of methods based on reduction of XTT and chemiluminescence of luminol have been shown. Both high selectivity and sensitivity of the method to analyze production of hydroxyl radicals based on the oxidation of TA was confirmed. By means of EPR spectroscopy, EDTA has been confirmed to have very good holes quenching properties.
Our group becomes more and more international. For one month we will host Prof. Minoru Mizuhata from Kobe University. During his stay at our faculty, the professor will conduct two courses entitled “Ceramics prepared by low-temperature synthesis-soft solution process” and “Structure and properties of electrolyte solution”.
The scientific cooperation with Prof. Radim Beranek and his group reaches a new level – Paweł Mikrut spent three months in the Institute of Electrochemistry – Ulm University.
We are glad to inform that we are looking for people to work within the TEAM project “In quest of a more efficient quantum solar energy exploitation in energy downhill and uphill photocatalytic processes (INGENIOUS)”
More detailed offer can be downloaded from following link:
We are glad to inform that we are looking for PhD students to work within the SHENG-1 project “Photocatalytic reduction of carbon dioxide based on p-type semiconductors “.
More detailed offer can be downloaded from the following link:
We are looking for postdoctoral fellow to work within the TEAM project “In quest of a more efficient quantum solar energy exploitation in energy downhill and uphill photocatalytic processes (INGENIOUS)”
Mateusz Trochowski has got his PhD degree. Congratulations!
Diversity of the photosensitization mechanisms of surface-functionalized oxide semiconductors.
The doctoral thesis is focused on verification of four hypotheses related to the photosensitization mechanisms of titanium(IV) oxide and zinc oxide. The first hypothesis concerned the possibility of protection of photosensitizers bound to the TiO2 surface by covering them with a thin layer of titanium(IV) oxide to improve the photostability. The strategy worked only for a minority of the tested samples. The second hypothesis was the higher stability of dihydroxy derivatives of anthraquinone comparised to catechol adsorbed at TiO2. Long-term photocatalytic tests have shown that all obtained materials are more photostable than the reference catechol/TiO2 system and some of them are also more active. The third problem concerned investigation how insignificant modifications of photocatalysts can significantly change their photocatalytic activity. A significant effect on photocatalytic activity, of the studied materials, in particular upon visible light irradiation, was observed, although changes in the phase composition, spectroscopic properties and morphology of the samples tested were negligible. The fourth hypothesis concerned determining of the mechanisms of localized surface plasmon resonance interaction with ZnO modified with Au nanoparticles. The analysis of emission spectra has shown that photosensitization of ZnO occurs most probably via the transfer of “hot” electrons.