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Proceedings of the 23rd International Symposium on Analytical and Environmental Problems
Full text linkProceedings of the 21st International Symposium on Analytical and Environmental Problems
Full text linkProceedings of the 22nd International Symposium on Analytical and Environmental Problems
Full text linkProceedings of the 27th International Symposium on Analytical and Environmental Problems
Full text linkTransformation of thiacloprid, a new insecticide, by gamma radiolysisin aqueous solutions
Full text linkDegradation of organic pollutants in wastewater by ionizing radiation is an emerging technology. Using this method the transformation of thiacloprid takes place by reactions with free radicals (hydroxyl radical (•OH), hydrated electron (eaq ), hydrogen radical (•H), and hydroperoxyl radical/superoxide radical anion(HO2 /O2 )).Gamma (γ)radiolysis is an appropriatemethod to investigate the role of primary radicals in the transformation and degradation of thiacloprid. In this study we examined different reaction conditions (solutions of thiaclopridsaturated with dissolved oxygen or nitrogen or nitrous oxide),in order to investigate the effect of different radical sets formed
Photocatalytic ozonation of monuron over suspended and immobilized TiO2
Full text linkHeterogeneous photocatalysis, using photocatalyst in suspensions and in immobilized form, ozonation, and their combination (photocatalytic ozonation) at various ozone (O3) concentrations (0–20 mg dm–3 O3 in gas phase) were investigated and compared in the transformation of the herbicide monuron (3-(p-chlorophenyl)-1,1-dimethylurea). Using the photocatalyst (Aeroxide® P25) in immobilized form, the rate of transformation of monuron was considerably lower compared to the case of suspension (1.0 g dm–3 TiO2). O3 increased the rate of transformation in each case, while the photocatalyst decreased the concentration of dissolved O3. However, there was no synergistic effect during the combination of heterogeneous photocatalysis and ozonation. The economic feasibility of the treatments was also compared based on the obtained values of Electrical Energy per Order (EEO). The EEO value decreased with the increase of O3 concentration in each case, and there was no significant difference between the energy requirement of ozonation and its combination with heterogeneous photocatalysis using TiO2 in suspension at each O3 concentration
UV és látható fénnyel gerjeszthető fotokatalizátorok a napfényt hasznosító heterogén fotokatalízisben
Full text linkUV- and Visible Light Active Photocatalysts in Solar Heterogeneous Photocatalysis = UV és látható fénnyel gerjeszthető fotokatalizátorok a napfényt hasznosító heterogén fotokatalízisben
No full textTREATMENT OF OIL CONTAMINATED WATERS BY (PHOTO-)FENTON REACTION AND THEIR EFFECTS ON MEMBRANE FILTRATION
Full text linkIn the present study crude oil contaminated (100 ppm oil content; doil drops< 1.5µm) water was purified by Fenton reaction, UV/H2O2 combined treatment and by photo-Fenton reaction. Among the investigated advanced oxidation processes, photo-Fenton treatment showed emergent purification efficiency, which resulted 53% decline of chemical oxygen demand after 120 min of treatment. It can also be concluded that after the treatment with photo-Fenton reaction, adjusting the pH to 7, iron-hydroxide was precipitated, which adhered the residual oily contaminants, which increased the flux during the microfiltration of the pre-treated water
HIDROGÉN-PEROXID ALKALMAZÁSA LÁTHATÓ FÉNNYEL GERJESZTHETŐ ANATÁZ FÁZISÚ TITÁN-DIOXIDOK ELŐÁLLÍTÁSÁRA
Full text linkIn the present study anatase phase titanium dioxide was fabricatedusing hydrogen peroxide during the synthesis method, to facilitate the visible light excitability of the titania. The photocatalysts were characterized by XRD, DRS, and IR measurements, and the photocatalytic activity was determined by the degradation of phenol under visible light irradiation. Self-made anatase TiO2 (denoted as ‘TiO2_pH3_70°C’) possessed superior photocatalytic efficiency compared to commercial Aeroxide P25 and Aldrich Anatase. The DRS spectra indicated that the light absorption was shifted into the visible region in case of our self-made TiO2which corresponds well with the resulted high photocatalytic efficiency
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