Sonja Miličević

Institute for Technology of Nuclear and other Mineral Raw Materials

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Sanja Martinović

Institute of Chemistry, Technology and Metallurgy

Aleksandra Daković

Institute for Technology of Nuclear and other Mineral Raw Materials

Vladan Milošević

University of Bergen

Milica Vlahović

University of Belgrade

Milan Kragović

University of Belgrade

Ndue Kanari

Université de Lorraine

Ana Popović

Technical College of Applied Sciences

Frédéric Diot

Centre National de la Recherche Scientifique

Jacques Yvon

GeoRessources

ŽS

Živko Sekulić

Institute for Technology of Nuclear and other Mineral Raw Materials

Cooperative Institutions

University of Belgrade

Institute for Technology of Nuclear and other Mineral Raw Materials

Vinča Institute of Nuclear Sciences

Mining and Metallurgy Institute Bor

Institute of Economic Sciences

Institute of Chemistry, Technology and Metallurgy

University of Nis

Centre National de la Recherche Scientifique

University of Split

University of Novi Sad

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Sorption of copper by fly ash

HAL (Le Centre pour la Communication Scientifique Directe) (2018)

Sonja Miličević Sanja Martinović Milica Vlahović Ndue Kanari Frédéric Diot

On the fly

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Removal of copper and lead by clinoptilolite and clinoptilolite-iron system

Milan Kragović Sonja Miličević Aleksandra Daković Jelena Perić Marina Trgo

The increasing levels of toxic metals (copper, zinc, cadmium, lead, nickel, chromium, etc.) that are discharged to the environment as industrial wastes, represent a serious threat to human health, living resources and ecological systems. Due to their tendency to accumulate in living organisms, causing various diseases and disorders, the treatment methods for heavy metals removal are essential for environmental and human health protection (Sljivic et al. 2009). Among numerous methods for water purification, sorption technologies have gained the most attention because of low cost and easy operation. Natural materials, such as zeolites and clay minerals are the commonly used sorbents for heavy metals removal. Iron oxides are also active sorbents and play an important role in the reaction behavior of many ions in environmental sediments. Many researchers have tried to synthesize mixed systems of iron oxides and clay minerals or zeolites and they have proven that these systems were able to adsorb high concentrations of inorganic species. Recently, iron-overexchanged clinoptilolite (Clino-Fe) was tested for removal of Mn2+ ions from drinking water and in Cu2+ ions adsorption from KCl solutions at different pH values (Dimirkou and Doula, 2008). They reported that Clino-Fe system had much higher adsorption capacity for Mn^2+ and Cu^2+ ions than unmodified clinoptilolite. The objective of the current investigation was to synthesize the clinoptilolite-iron system under strongly basic conditions and to investigate if the new sorbent has higher sorption capacity for lead and copper than the unmodified clinoptilolite.

Clinoptilolite

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Waste Slag from Heating Plants as a Partial Replacement for Cement in Mortar and Concrete Production. Part I—Physical–Chemical and Physical–Mechanical Characterization of Slag

Minerals (2020)

Andrijana Nedeljković Marija Stojmenović Jelena Gulicovski Nenad Ristić Sonja Miličević

Numerous factors influence the complexity of environmental and waste management problems, and the most significant goal is the reuse of materials that have completed their “life cycle” and the reduction in the use of new resources. In order to reduce impact of waste slag on the environment, in the present study, waste slag, generated in heating plants after lignite combustion, was characterized in detail and tested for application as a replacement for cement in mortar or concrete production. For physical–chemical characterization of slag, different experimental and instrumental techniques were used such as chemical composition and determination of the content of heavy metals, investigation of morphological and textural properties, thermal analysis, X-ray, and infrared spectroscopy. Physical–mechanical characterization of slag was also performed and included determination of activity index, water requirement, setting time and soundness. A leaching test was also performed. Presented results show that waste slag may be used in mortar and concrete production as a partial cement replacement, but after additional combustion at 650 °C and partial replacement of slag with silica fume in the minimal amount of 12%. The maximal obtained cement replacement was 20% (17.8% slag and 2.2% of silica fume).

Slag (welding)

Copper slag

Silica fume

10.3390/min10110992

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Development and mechanical properties of the pelletized fly ash

HAL (Le Centre pour la Communication Scientifique Directe) (2019)

Sonja Miličević Sanja Martinović Vladimir Jovanović Milica Vlahović Ndue Kanari

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Sorption of copper by fly ash

HAL (Le Centre pour la Communication Scientifique Directe) (2018)

Sonja Miličević Sanja Martinović Milica Vlahović Ndue Kanari Frédéric Diot

On the fly

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Chemical behavior of iron modified zeolite at different pH values of aquaeous solutions

Marin Ugrina Nediljka Vukojević Medvidović Jelena Perić Marina Trgo Aleksandra Daković

The sample of natural zeolite originating from the Vranjska Banja deposit has been used in preparation of iron modified zeolite (IMZ), which has shown a significant increase of adsorption capacity towards heavy metal ions. This paper examines the chemical behavior of IMZ in the IMZ - ultrapure water system at different initial pH values in the range from 1.71 to 5.08. The results show that a rapid increase of pH is observed in the time interval up to 300 min in the pH range from 2.85 to 5.08. This can be attributed to the OH^- ions released during the process of exchange of H^+ ions from water with Na+ and other exchangeable cations from the zeolitic structure. At pH=1.71, the suspension pH was unchanged during 24 hours, when partial dissolution and degradation of the aluminosilicate structure have been observed.

Ultrapure water

Suspension

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Chlorination as an alternative for the treatment of metallic sulfides at low temperatures

HAL (Le Centre pour la Communication Scientifique Directe) (2018)

Ndue Kanari Eric Allain Sonja Miličević Frédéric Diot Jacques Yvon

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Influence of organic cations sorption on the point of zero charge of natural zeolite

Hemijska industrija (2009)

Milan Kragović Aleksandra Daković Sonja Miličević Zivko Sekulic S.K. Milonjić

In this paper, the results of the surface modification of natural zeolite with different amounts (2, 5 and 10 mmol M+/100g) of octadecyldimethylbenzyl ammonium ions (ODMBA) are presented. The obtained organozeolites were denoted as OZ-2, OZ-5 and OZ-10. The degree of ion exchange was followed by determination of amounts of inorganic cations released from zeolite. Results confirmed that reaction between ODMBA and starting zeolite has occurred via ion exchange mechanism. The obtained value for point of zero charge, pHpzc, of natural zeolite was 6.8?0.1, while for OZ-2, OZ-5 and OZ-10 pHpzc was 7.0?0.1. Below the pHpzc, the surfaces of materials are positive while at pH values higher than pHpzc their surfaces are negative. Compared to the pHpzc of natural zeolite, no significant differences in pHpzc was observed for all three organozeolites indicating that obtained products have similar functional groups with similar acid and basic characteristics as starting zeolite. The pHpzc was not dependent on the amount of ODMBA ions at the zeolitic surface and the value of pHpzc for all investigated sorbents is the same for all three electrolyte concentrations indicating that the pHpzc of each material is independent of the ionic strength of KNO3.

Clinoptilolite

10.2298/hemind0904325k

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Sorption of lead by natural and its iron (III) modified zeolite

Milan Kragović Aleksandra Daković Sonja Miličević Vladan Sekulić Živko

In this paper, results of lead sorption by the natural and its iron (III)-modified zeolite are presented. It was determined that, for both zeolites lead sorption increased with increasing the initial concentration of lead in solution. Much higher sorption of lead was achieved with the iron (III)-modified zeolite. The results were fitted to the Langmuir and Freudlich sorption isotherm. The best fit of experimental data was achieved with the Freundlich sorption isotherm (correlation coefficient >0.93). From Langmuir isotherm, maximally sorbed amount of lead was 0.318 and 0.642 mmol/g for the natural and iron (III)-modified zeolite, respectively.

Langmuir adsorption model

Sorption isotherm

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Characteristics of fly ashes, their potential uses and damaged conditions of landfill deposits

HAL (Le Centre pour la Communication Scientifique Directe) (2018)

Ndue Kanari Frédéric Diot Sonja Miličević Sanja Martinović Milica Vlahović

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