Technical Faculty in Bor
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Application of mullein leaf for biosorption of Zn(II) and Ni(II) ions from synthetic solutions
(University of Banja Luka, Faculty of Technology, 2025) Nujkić, Maja; Tasić, Žaklina; Medić, Dragana; Milić, Snežana; Stanković, Sonja; Pešić, Marina
In this study, the potential of mullein leaves (Verbascum thapsus) for the biosorption of Zn(II) and Ni(II) ions from synthetic solutions was investigated. Several factors affecting the biosorption efficiency of mullein leaf powder were investigated, including initial Zn(II) and Ni(II) concentration (25–400 mg L−1), solution pH (3–7), contact time (10–120 min), and biosorbent dosage (2–20 g L−1). The concentration of Zn(II) and Ni(II) before and after biosorption was determined using an optical emission spectrometer with inductively coupled plasma. The maximum biosorption efficiency of 86.46% was observed at a biosorbent dosage of 20 g L−1, pH = 4, contact time 90 min and an initial Zn(II) oncentration of 100 mg L−1. Also, the good biosorption efficiency of 76.51% for Ni(II) ions was achieved at a contact time of 90 minutes. Therefore, mullein was most effective in removing Zn(II) ions from synthetic solutions. Thus, mullein has the potential to be a cost-effective biosorbent for wastewater treatment, but further studies on modified mullein should be conducted.
Investigation of thermal properties of Al–Cu eutectic alloy for phase change energy storage applications
(Springer, 2025) Manasijević, Dragan; Balanović, Ljubiša; Cimpoesu, Nicanor; Markovic, Ivana; Gorgievski, Milan; Stamenković, Uroš; Stepanović, Aleksandra
The knowledge of thermal properties such as thermal conductivity, specific heat, and latent heat of melting is essential for the development of phase change materials (PCMs) for latent heat energy storage applications. Due to their good properties, aluminum-based eutectic alloys have become the most widely studied metal-based PCMs. In the present study, microstructure, thermal diffusivity, thermal conductivity, specific heat capacity, and latent heat of melting of the Al-33.6 mass% Cu eutectic alloy were examined using scanning electron microscopy, energy dispersion spectroscopy, differential scanning calorimetry, and light flash method. The results show that the microstructure of the investigated alloy consists of fine and coarse (Al) + Al2Cu eutectic regions. Specific heat, thermal diffusivity, and thermal conductivity increase with increasing temperature in the temperature range 25–400 °C. The thermal conductivity of the studied alloy at room temperature is 134.3 Wm−1 K−1. The measured latent heat is 319.5 Jg−1. The obtained results indicate that the Al–Cu eutectic alloy has considerable potential for application in the field of phase change energy storage materials.
Tekstilna industrija
(Savez inženjera i tehničara tekstilaca Srbije, 2024) Urošević, Snežana; Urošević, Snežana
Effect of Chemical Composition on the Corrosion Resistance, Microstructure, Hardness and Electrical Conductivity of the Ge–In–Sn Alloys
(Springer, 2023) Zečević, Milena; Tosković, Nemanja; Đorđević, Aleksandar; Minić, Duško; Tošković, Dragan; Kolarević, Milan; Ristić, Vladica; Tasić, Žaklina
This paper presents the results of experimental and analytical testing of the ternary Ge–In–Sn system.
Experimental part includes results of the corrosion resistance, microstructure, hardness and electrical properties of the selected ternary Ge–In–Sn alloys. The prepared alloys were tested using X-ray powder diffraction (XRD) method, scanning electron microscopy with energy dispersive spectrometry (SEMEDS), hardness and electrical conductivity tests. For the obtained values of hardness and electrical conductivity, a mathematical model was used in order to determine the properties of the alloy in the entire range of the composition. The results of the Brinell hardness test show that the Ge80In10Sn10 ternary alloy has the highest hardness of all tested ternary alloys, 254.2 MN/m2 . While, results of the electrical conductivity test show that the Ge10In10Sn80 ternary alloy has the highest conductivity of all tested ternary alloys and the highest corrosion resistance. Calculated isothermal section at 25 C, were confirmed with XRD and EDS results.
The Granger causality of digital connectivity and trade globalization in the health crisis
(University of Belgrade, Technical Faculty in Bor, 2024) Petkovski, Ivana; Fedajev, Aleksandra; Milošević, Isidora
The widespread adoption of digital technology in the last decade has caused global changes, leading to the belief that technology is altering the global connectivity of economies. This is especially emphasized in light of the global health crisis in 2020. To efficiently monitor this process, it is vital to assess the anticipatory potential of this type of digital connectivity and the growth of globalization in trade. An effective analysis of this issue necessitates looking into the causative relationship between digital technology connections and trade globalization. This is performed by applying the statistical approach of Granger causality to a data set consisting of 35 European countries from 2010 to 2022. A Granger causality study was performed using the lag value estimated based on the Akaike information criterion, which equals 2. The findings suggested that there is a unidirectional causal relationship between active mobile-broadband subscriptions and imports, with the former influencing the latter. However, this causal relationship fails to be valid in the opposite direction. The examination revealed a reciprocal relationship between fixed-telephone subscriptions and exports, as well as a reciprocal relationship between fixed-telephone subscriptions and imports. The results reveal the bidirectional value of the number of fixed telephone subscriptions as a measure of digital connectivity.