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17 results on '"Vuksanovic, Marija"'

5. Modified hybrid cellulose membrane for Nickel(ii) ions removal from industrial wastewater

Author

Jovanović, Aleksandar, Bugarčić, Mladen, Milošević, Milena, Vuksanovic, Marija, Abdualatif Abduarahman, Muna, Sokić, Miroslav, Marinković, Aleksandar, Jovanović, Aleksandar, Bugarčić, Mladen, Milošević, Milena, Vuksanovic, Marija, Abdualatif Abduarahman, Muna, Sokić, Miroslav, and Marinković, Aleksandar

Abstract

Nickel pollution of water induces several problems for the environment. The purpose of this paper was to investigate the adsorption of Ni2+ ions on fabricated biomembranes. The proposed adsorbent was prepared from epoxy and amino-functionalized waste cellulose fibers, able to participate in cross-linking with amino acid lysine - wCell/Mn-Fe_LDH. The prepared material underwent preliminary structural characterization by Fourier-transform infrared spectroscopy. In a batch system, the influence of pH, contact time, temperature, and initial concentration on adsorption efficiency was investigated. The effectiveness of the membrane was demonstrated by acceptable adsorption capacities of 40.49 mg g-1 obtained for Ni2+ at 45°C. The kinetic study, using the Weber-Morris model, indicates intraparticle diffusion as the rate limiting step. Adsorption mechanism physisorption was proposed based on thermodynamic behaviors. The outcomes demonstrated that environmentally friendly sustainable technology has been successfully developed.

Published
2023

8. Principal component analysis of morphological descriptors for monitoring surface defects induced by thermal shock

Author

Martinovic, Sanja, Vlahovic, Milica, Gajić-Kvaščev, Maja, Vuksanovic, Marija, Glišić, Dragomir, Volkov-Husović, Tatjana, Martinovic, Sanja, Vlahovic, Milica, Gajić-Kvaščev, Maja, Vuksanovic, Marija, Glišić, Dragomir, and Volkov-Husović, Tatjana

Abstract

Pattern recognition techniques are applied to various morphological descriptors to monitor the formation and propagation of surface defects of materials subjected to thermal shock. A low-cement high-alumina castable was synthesized, cured, sintered, and exposed to thermal stability testing using the water quench test. After a certain number of thermal shock cycles, photographs of the samples’ surfaces were taken and subjected to image analysis. The influence of the sintering temperature on the morphology of the detected defects was studied using principal component analysis (PCA) as a pattern recognition technique that is the most informative for extracting possible differences. The morphological descriptors of the defects correspond to the previous results regarding the influence of sintering temperature on the structure of a castable during thermal shocks.

Published
2021

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