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This paper presents a comparative analysis of three carbon-based electrodes: bare multiwalled carbon nanotubes (MWCNT), SnO2/MWCNT, and PbO2/graphene-nanoribbons (PbO2/GNR) composites, as anodes for the electrooxidative degradation of Rhodamine B as a model organic pollutant. Anodic electrooxidation of Rhodamine B was performed on all three electrodes, and the decolorization efficiency was found to increase in the order MWCNT < PbO2/GNR < SnO2/MWCNT. The electrodes were characterized by X-ray photoelectron spectroscopy (XPS) and linear sweep voltammetry (LSV). It was proposed that, in the 0.1 M Na2SO4 applied as electrolyte, observed decolorization mainly occurs in the interaction of Rhodamine B with OH radical adsorbed on the anode. Finally, the obtained results were complemented with Density Functional Theory (DFT) calculations of OH-radical interaction with appropriate model surfaces: graphene(0001), SnO2(001), and PbO2(001). It was found that the stabilization of adsorbed OH-radical on metal oxide spots (SnO2 or PbO2) compared to carbon is responsible for the improved efficiency of composites in the degradation of Rhodamine B. The observed ability of metal oxides to improve the electrooxidative potential of carbon towards organic compounds can be useful in the future design of appropriate anodes.

J. SUBOTIĆ i dr. UPRAVLJANJE BRZINAMA NA PUTEVIMA 844 TEHNIKA -SAOBRAĆAJ 61 (2014) 5 Upravljanje brzinama na putevima JOVANA LJ. SUBOTIĆ, Univerzitet u Beogradu, Stručni rad Saobraćajni fakultet, Beograd UDC: 656.11.01 OLIVERA S. JOVIČIĆ, Univerzitet u Beogradu, Saobraćajni fakultet, Beograd MARIJA D. SIMIĆ, Univerzitet u Beogradu, Saobraćajni fakultet, Beograd ĐURĐIJA V. MITROVIĆ, Univerzitet u Beogradu, Saobraćajni fakultet, Beograd Brzina ali i vozila kao uzročnici tih brzina, utiču kako na nivo usluge tako i na bezbednost u saobraćaju i na kvalitet života. Usled toga je upravljanje brzinama saobraćaja od višestrukog značaja i ono treba pre svega da obezbedi efikasne i ekonomične uslove odvijanja modernog saobraćaja kao i preventivnu zaštitu ljudskih života kao najvećeg blaga, a potom i materijalnih sredstava. U radu su prukazani načini na koje se to postiže uz pomoć različitih mera kao što su: odgovarajuće planiranje i projektovanje puteva i ulica, odgovarajuće upravljanje saobraćajem, legislativom, prisilom, određenim kapanjama, edukacijom, primenom naprednih tehnologija (ITS). Ključne reči: upravljanje brzinama, kontrola brzina, inteligentni transportni sistemi (ITS), koordinacija SUMMARY TRAFFIC SPEED MANAGEMENT Speed, and vehicles themselfes, affect the level of service and road safety, quality of life, noise from traffic, the environment, health, air pollution, emission of carbon dioxide, global warming, the economy and consumption of non-renewable energy such as oil. Therefore, the speed management of the traffic of multiple significance and that should be primarily to provide effective and economical conditions of the modern and preventive protection of human life as the greatest treasure and then the material resources. The way to accomplish this is by using various (different) measures such as: appropriate planning and projecting roads and streets, speed control, the legislation, enforcement, campaigns, education, advanced technologies (ITS).