21. Developing DGT technique for determination of iron redox species by photothermal beam deflection spectrometryHanna Budasheva, Arne Bratkič, Chang Zhou, Dorota Korte, Yue Gao, Mladen Franko, Bruno Delille, 2019, published scientific conference contribution abstract Keywords: Diffusive Gradients in Thin Films, Beam Deflection Spectrometry, iron redox species Published in RUNG: 25.09.2019; Views: 3603; Downloads: 0 This document has many files! More... |
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23. Determination of bioavailable Fe redox fractions of sediment pore waters by DGT passive sampling and BDS detectionHanna Budasheva, Dorota Korte, Arne Bratkič, Mladen Franko, 2019, published scientific conference contribution abstract Abstract: The bioavailability and toxicity of contaminants in sediments to benthic organisms depend on the speciation of the contaminant [1]. The level of iron supply to sediments creates contrasting chemical pathways, each producing distinctive mineral assemblag- es. Reliable measurement of Fe redox species (Fe2+ and Fe3+) in sediments is essential for studies of pollutants or trace-element cycling. This is, however, a difficult task, because the distribution of chemical species often changes during sampling and storage.
In this work the Diffusive Gradients in Thin-films technique (DGT) is investigated as a passive sampling approach used in combination with photothermal beam deflection spectroscopy (BDS) as a detection method for determination of labile Fe-redox species in sediments and natural waters. DGT offers the advantage of pre-concentration of labile (i.e. bioavailable) Fe species from the total dissolved Fe pool in sediment pore waters [2]. The advantage of using BDS [3-4] is also in avoiding contamination by using additional steps as extraction or pre-concentration. Furthermore, combined DGT-BDS provides 2D information about distribution of Fe2+ and the total Fe content in the resin hydrogels [5].
The goal of this research is to show the repeatability of this technique for determining trace amounts of Fe redox species in environmental samples. Keywords: beam deflection spectrometry, diffusive gradients in thin-films, iron species Published in RUNG: 16.07.2019; Views: 3616; Downloads: 0 This document has many files! More... |
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25. Synthesis of molybdenum carbide thin films for production of hydrogen via electrochemical water splitting : M. Sc. thesisCesur Altinkaya, 2018, master's thesis Keywords: molybdenum, platinum, molybdenum carbide thin films, hydrogen evolution reaction, water splitting, electrolysis, electrochemistry, pyrolysis, thin films Published in RUNG: 30.08.2018; Views: 5107; Downloads: 0 This document has many files! More... |
26. Transparent titania-zirconia thin films for self-cleaning and photocatalytic applicationNives Vodišek, Kandalam Ramanujachary, Vlasta Brezová, Urška Lavrenčič Štangar, 2016, published scientific conference contribution abstract Abstract: Thin films were prepared by sol-gel process, where different amount of zirconia were added to titania.
Photocatalytic activity of thin films was measured by two methods i) determination of degradation ration of methyl stearate with measuring the contact angle and ii) formation of hydroxyterephthalic acid was measured by spectrofluorometer.
Prepared samples were characterized by UV-Vis spectrophotometer, SEM, XRD, FT-IR ATR, and BET.
The result of measurements of photocatalytic activity shows that the highest activity has a sample without addition of zirconia, but mechanical stability of that sample is worse. Keywords: photocatalysis, ZrO2/ TiO2, thin films, self-cleaning, low-temperature, sol-gel process Published in RUNG: 14.03.2017; Views: 5297; Downloads: 203 Full text (462,52 KB) |
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28. Thermal and elastic characterization of glassy carbon thin films by photoacoustic measurementsDragan D. Markushev, J. Ordonez-Miranda, Mihajlo Rabasović, M. Chirtoc, D. M. Todorovic, S. E. Bialkowski, Dorota Korte, Mladen Franko, 2017, original scientific article Keywords: Thermal and elastic characterization, glassy
carbon, thin films, photoacoustic measurements Published in RUNG: 23.01.2017; Views: 4544; Downloads: 0 This document has many files! More... |
29. Solar-driven photocatalytic treatment of diclofenac using immobilized TiO2-based zeolite compositesMarin Kovacic, Subhan Salaeh, Hrvoje Kušić, Andraz Suligoj, Marko Kete, Mattia Fanetti, Urška Lavrenčič Štangar, Dionysios D. Dionysiou, Ana Lončarić Božić, 2016, original scientific article Abstract: The study is aimed at evaluating the potential of
immobilized TiO2-based zeolite composite for solar-driven
photocatalytic water treatment. In that purpose, TiO2-iron-exchanged
zeolite (FeZ) composite was prepared using commercial
Aeroxide TiO2 P25 and iron-exchanged zeolite of ZSM5
type, FeZ. The activity of TiO2-FeZ, immobilized on glass
support, was evaluated under solar irradiation for removal of
diclofenac (DCF) in water. TiO2-FeZ immobilized in a form
of thin film was characterized for its morphology, structure,
and composition using scanning electron microscopy/energydispersive
x-ray spectroscopy (SEM/EDX). Diffuse reflectance
spectroscopy (DRS) was used to determine potential
changes in band gaps of prepared TiO2-FeZ in comparison
to pure TiO2. The influence of pH, concentration of hydrogen
peroxide, FeZ wt% within the composite, and photocatalyst
dosage on DCF removal and conversion efficiency by solar/
TiO2-FeZ/H2O2 process was investigated. TiO2-FeZ demonstrated
higher photocatalytic activity than pure TiO2 under
solar irradiation in acidic conditions and presence of H2O2. Keywords: Photocatalysis, Thin films, TiO2-FeZ, Solar irradiation, Diclofenac, Water Treatment Published in RUNG: 22.07.2016; Views: 6328; Downloads: 0 This document has many files! More... |
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