Supplementary data for article: Kop, T. J.; Dordevic, J.; Bjelakovic, M. S.; Milić, D. Fullerene Bisadduct Regioisomers Containing an Asymmetric Diamide Tether. Tetrahedron 2017, 73 (50), 7073–7078. https://doi.org/10.1016/j.tet.2017.10.069

Supplementary material for: [https://doi.org/10.1016/j.tet.2017.10.069]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2565

Supplementary data for article: Bjelaković, M. S.; Kop, T. J.; Dordević, J.; Milić, D. R. Fulleropeptide Esters as Potential Self-Assembled Antioxidants. Beilstein Journal of Nanotechnology 2015, 6 (1), 1065–1071. https://doi.org/10.3762/bjnano.6.107

Supporting information for: [https://doi.org/10.3762/bjnano.6.107]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/1695

Supplementary material for the article: Kop, T.; Bjelaković, M.; Dordević, J.; Žekić, A.; Milić, D. Fulleropyrrolidines Derived from Dioxa- and Trioxaalkyl-Tethered Diglycines. RSC Advances 2015, 5 (115), 94599–94606. https://doi.org/10.1039/c5ra17392b

Supplementary material for: [https://doi.org/10.1039/c5ra17392b]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/1998

Fulleropeptide esters as potential self-assembled antioxidants

The potential use of amphiphilic fullerene derivatives as a bionanomaterial was investigated by cyclic voltammetry (CV), scanning electron microscopy (SEM), and the ferrous ion oxidation-xylenol orange (FOX) method. Despite the disrupted delocalization of the pi-electronic system over the C-60 sphere, its antioxidant capacity remained high for all twelve derivatives. The compounds expressed up to two-fold and 5-12-fold better peroxide quenching capacity as compared to pristine C-60 and standard antioxidant vitamin C, respectively. During precipitation and slow evaporation of the solvent, all compounds underwent spontaneous self-assembly giving ordered structures. The size and morphology of the resulting particles depend primarily on the sample concentration, and somewhat on the side chain structure.Supplementary material: [http://cherry.chem.bg.ac.rs/handle/123456789/3368

Supplementary data for article: Kop, T. J.; Dordevic, J.; Bjelakovic, M. S.; Milić, D. Fullerene Bisadduct Regioisomers Containing an Asymmetric Diamide Tether. Tetrahedron 2017, 73 (50), 7073–7078. https://doi.org/10.1016/j.tet.2017.10.069

Supplementary material for: [https://doi.org/10.1016/j.tet.2017.10.069]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2565

Supplementary data for article: Bjelaković, M. S.; Kop, T. J.; Dordević, J.; Milić, D. R. Fulleropeptide Esters as Potential Self-Assembled Antioxidants. Beilstein Journal of Nanotechnology 2015, 6 (1), 1065–1071. https://doi.org/10.3762/bjnano.6.107

Supporting information for: [https://doi.org/10.3762/bjnano.6.107]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/1695

Supplementary material for the article: Kop, T.; Bjelaković, M.; Dordević, J.; Žekić, A.; Milić, D. Fulleropyrrolidines Derived from Dioxa- and Trioxaalkyl-Tethered Diglycines. RSC Advances 2015, 5 (115), 94599–94606. https://doi.org/10.1039/c5ra17392b

Supplementary material for: [https://doi.org/10.1039/c5ra17392b]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/1998

Microbial Recovery of Copper and Zinc from Wasted Electronic Parts

Recycling of electronic waste is crucial not only from the viewpoint of waste treatment but also from aspect of the recovery of valuable metals [1]. The aim of our study was to investigate the potential of using the Acidithiobacillus sp. B2, to solubilize metals (Cu and Zn) from electronic waste. Methodology: Chemical analysis of electronic waste and pyrite The electronic waste (after separating of the plastic parts) and pyrite were pulverized and sieved through a 63 µm stainless steel sieve in preparation for chemical and leaching studies. Electronic waste preparation for the leaching experiment The presence of alkali components in electronic waste is considered inconvenient for the reaction between the electronic waste and the acidic iron(III) sulphate solution. Hence, it is necessary to neutralize the electronic waste before adding the bacterial culture which would generate the oxidant. Before the leaching experiment, electronic waste was dispersed in 0.05 M H2 SO4 solution, shaken for 48 h, filtered from the solution, washed out with deionized water and dried at 110 °C [2]. Preparation of pyrite for the leaching experiments The pyrite concentrate for the leaching experiments was prepared by treating with a 0.5 mol/dm3 sulphuric acid solution (pH ~ 0.5) (solid to liquid phase ratio 1:5 m/V), and mixing with a mechanical stirrer at a room temperature overnight. Then, the solution was decanted, washed with deionized water and dried at 80 °C to a constant mass [2]. Leaching experiments The leaching experiments were carried out with bacterium Acidithiobacillus sp. B2. Experimental conditions were: leaching period of 20 d, 50 ml leaching solution (g/dm3 ): (NH4 )2 SO4 (3), K2 HPO4 (0.5), MgSO4 x 7H2 O(0.5), KCl (0.1), Ca(NO3 )2 (0.01), at a pH of 2.5 in 150 mL Erlenmeyer flasks at a pulp density of 10% (m/V) (5 g leaching substrate in 50 ml solution). The pH of the leaching solution was maintained at a constant value during the leaching process. One half of the substrate was pyrite and the other was an electronic waste. The initial number of microogranisms was 107 per mL, determined by the Most Probable Number method. The control suspension had the same chemical content and pH value as the suspension with Acidithiobacillus sp. B2 but the Acidithiobacillus sp. B2 culture had been inactivated by sterilization. The study was realized on a horizontal shaker. The incubation temperature was 28 °C [2]. Results and conclusions: The results of the effective metal leaching (calculated by subtraction of percentage metal leaching in the control suspension from that in the Acidithiobacillus sp. B2 suspension) are as follows: Zn (38%)>Cu (35%). The obtained results demonstrate that Acidithiobacillus sp. B2 was able to grow in the presence of electronic waste and may be “green” agents in the area of circular economy and sustainable development

High annual radon concentration in dwellings and natural radioactivity content in nearby soil in some rural areas of Kosovo and Metohija

Some previous studies on radon concentration in dwellings of some areas of Kosovo and Metohija have revealed a high average radon concentration, even though the detectors were exposed for three months only. In order to better design a larger study in this region, the annual measurements in 25 houses were carried out as a pilot study. For each house, CR-39-based passive devices were exposed in two rooms for the two consecutive six-month periods to account for seasonal variations of radon concentration. Furthermore, in order to correlate the indoor radon with radium in nearby soil and to improve the knowledge of the natural radioactivity in the region, soil samples near each house were collected and 226Ra, 232Th, 40K activity concentration were measured. The indoor radon concentration resulted quite high from the average (163 Bq/m3) and generally it did not differ considerably between the two rooms and the two six-month periods. The natural radionuclides in soil resulted to be distributed quite uniformly. Moreover, the correlation between the226Ra content in soil and radon concentration in dwellings resulted to be low (R2=0.26). The annual effective dose from radon and its short-lived progeny (5.5 mSv, in average) was calculated by using the last ICRP dose conversion factors. In comparison, the contribution to the annual effective dose of outdoor gamma exposure from natural radionuclides in soil is nearly negligible (66 mSv). In conclusion, the observed high radon levels are only partially correlated with radium in soil; moreover, a good estimate of the annual average of radon concentration can be obtained from a six-month measurement with a proper choice of exposure period, which could be useful when designing large surveys

Ispitivanje bioremedijacionog potencijala bakterijskih konzorcijuma sedimenata čukaričkog kanala (Beograd)

Poster presented at: Prvi naučnog skupa:“Zaštita životne sredine“, (26. maj 2011., Sremska Kamenica)Abstract: [https://cherry.chem.bg.ac.rs/handle/123456789/5421