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One-step extraction of Cd, Ni, Sb and V applied to the river and accumulation sediments located in Serbia
No full textThe consequence of elevated values of toxic pollutants, which originate from numerous human
activities, is contaminated environment [1]. Rapid development of industry and agriculture
contributed to increase in heavy metals in invertebrates, fish and humans [2]. Heavy metals
accumulate in sediments over time which might be a trigger for numerous human diseases due to
possibility of transport of these metals in water medium and entering the food chain [3].
The aim of this study was the estimation of element contamination level in sediments of the important
rivers, accumulation and their tributaries in Serbia. The determination of the sample contents of the 4
elements (Cd, Ni, Sb and V) was conducted by the one-step extraction with inductively coupled
plasma atomic emission spectrometry (ICP OES). Extraction was done with three different acidic
extraction agents. Total of 33 samples of sediments from 16 major river and their tributaries in Serbia
wereanalyzed. The analyzed sediments showed high concentrations of Cd and Ni, which may have
great negative environmental impacts.
In sediments from Zapadna and Južna Morava, Tisa and river Pek the highest concentrations of Cd
was detected. The concentrations of Ni were above maximum permissible concentration in Vrutci and
Zapadna Morava river sediments. Results showed that the content of Sb was low in majority of the
samples. The highest content of V was extracted from Barje sediment sample
DEFINISANJE TEHNOLOŠKE ŠEME DOBIJANJA PUNIOCA ZA RAZLIČITE INDUSTRIJE NA BAZI KREČNJAKA “VISOČICA”- BJELOPAVLIĆI
No full textIspitivana je mogućnost korišćenja krečnjaka “Visočica” za dobijanje punioca. Ispitivani su mikronizacija, granulo-sastav, upijanje vode i ulja, i stepen bjeline. Urađena je hemijska i DTA/TG analiza. Na osnovu fizičko-hemijskih karakteristika ovaj krečnjak se može koristiti kao punioc u sledećim industrijama: za boje i lakove, kozmetičkoj i farmaceutskoj, papirnoj, gume i PVC-a, stakla, za proizvodnju životinjske hrane, livarskoj, šećera i metalurgiji. Zbog povišenog sadržaja MgO i G.Ž, ne može se koristiti u proizvodnji mineralnih đubriva. Zbog prisustva Cd, ne može se koristiti za neutralizaciju kiselih zemljišta
Micro- to nanoscale textures of ore minerals: methods of study and significance
No full textInvestigations of ore minerals, and mineralogical studies of the ore deposits in
general, are not only crucial for the interpretation of ore-forming processes and
genesis of ore deposits but also have a significant impact on the exploitation
efficiency and subsequent extractive metallurgy. Additionally, such researches also
comprise crystal chemistry and transformation processes in minerals (especially
sulphides) and thus providing a prominent contribution to the understanding of
presence and liberation of toxic elements in mining waste materials and their impact
on the environment. Simultaneously, by the oxidation processes precious metals (Au
and Ag) can be also liberated from the sulphides
Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2019), Book of Abstracts
No full textThe Fourth Metallurgical & Materials Engineering Congress of South-East Europe
(MME SEE 2019) is a biannual meeting of scientists, professionals, and specialists working
in the fields of metallurgical and materials engineering. The aim of the Congress is to
present current research results related to processing/structure/property relationships,
advances in processing, characterization, and applications of modern materials.
Congress encompasses a wide range of related topics and presents the current views
from both academia and industry: Future of metals/materials industry in South-East European
countries; Raw materials; New industrial achievements, developments and trends in
metals/materials; Ferrous and nonferrous metals production; Metal forming, casting,
refractories and powder metallurgy; New and advanced ceramics, polymers and composites;
Characterization and structure of materials; Recycling and waste minimization;
Corrosion, coating, and protection of materials; Process control and modeling; Nanotechnology;
Sustainable development; Welding; Environmental protection; Education; Accreditation
& certification.
The Editors hope that Congress will stimulate new ideas and improve the knowledge
in the field of metallurgical and materials engineering.
The Congress is organized jointly by the Association of Metallurgical Engineers of
Serbia, Faculty of Technology and Metallurgy, University of Belgrade, Institute for Technology
of Nuclear and Other Mineral Raw Materials, Institute of Chemistry, Technology
and Metallurgy, Vinca Institute of Nuclear Sciences and Serbian Foundrymen's Society.
The Editors would like to thank the Scientific and the Organizing Committee, the
Congress Secretariat - CONGREXPO d.o.o. and all those who helped in making the Congress
a success.
Special thanks are due to the Ministry of Education, Science and Technological Development
of the Republic of Serbia and sponsors for the financial support of the Congress
Obtaining Fillers Based on Limestone from Deposit Brijeg-Ulcinj for Applications in Various Industries
No full textPaper presents results of investigations of the possibility of using “Brijeg”-Ulcinj limestone as filler in various industries. Micronization, granulometric composition, oil and water absorption and degree of whiteness were investigated, and chemical and thermal analyses were performed. Physico-chemical properties of this sample classify it among high quality carbonate raw materials with high CaCO3 content of 98.21%, with low contents of MgCO3 0.88 % and SiO2 0.16 %. Its quality satisfies requirements of standards on using of calcium carbonate as filler in next industries: paints and coatings; rubber and PVC; glass; foundry ; sugar industry production of mineral fertilizers and metallurgy
Geology characteristics of zeolitic tuffes of Serbia
No full textSince about 50 years it is known that giant deposits of natural zeolites of pyroclastic origin are spread over all Miocene sediments of Serbia. Such rocks have often zeolite contents between 60 and 90%. The most significant Serbian deposits of natural zeolites are: Zlatokop, Igros, Beocin, Toponica, and Slanci. Based on obtained results of structural, chemical, physical, and thermal analyses, the investigated zeolite tuffs can be generally defined in two mineral series: clinoptilolite-Ca, and heulandite-Ca. The interest for these materials is in steady mass growth as they are of vital importance for Serbian economy. The oversights of perennial mineralogical research of Serbian giant deposits of natural zeolites were presented in this paper
Kaolin modified with cationic surfactant as a potential adsorbent for ketoprofen
No full textThe contamination of the natural aquatic environment by pharmaceuticals is a serious environmental problem due to their extensive use in human health and animal husbandry. One of the most efficient technique for removal of pharmaceuticals from water is their adsorption on activated carbons, clays and zeolites. In this study adsorption of ketoprofen (KETO), widely used non-steroidal anti-inflammatory drug, on modified kaolin was invesitgated. The natural kaolin (from Rgotina, Serbia) was modified with cationic surfactant hexadecyltrimethyl ammonium bromide in amounts equivalent to 50% and 90% of kaolin cationic exchange capacity. FTIR and DTA/TGA were used for characterisation of materials. The obtained data showed that adsorption of KETO by modified kaolin increased with increasing the amount of surfactant, as well as with increasing the amount of solid phase in the suspension (0.5 – 5.0 mg/ml). According to obtained results modified kaolin may be used as adsobent for removal of KETO from contaminated water
Graphene-reinforced composite hydroxyapatite/chitosan and hydroxyapatite/chitosan/gentamicin coatings
No full textGraphene (Gr) is a superior material with favorable mechanical and thermal properties,
predominately utilized as a component of exceptional composites [1]. In this work
graphene-reinforced composite coatings based on hydroxyapatite (HAP) and chitosan
(CS), with and without antibiotic gentamicin (Gent) were investigated.
Composite HAP/CS/Gr and HAP/CS/Gr/Gent coatings were electrophoretically
deposited in a single step process from aqueous suspension on pure titanium foils.
Detailed physico-chemical and biological characterization analyses were performed in
order to evaluate the influence of graphene on the properties of newly formed
composites. The formation of HAP/CS/Gr and HAP/CS/Gr/Gent composite coatings
was confirmed by X-ray diffraction, field emission scanning electron microscopy and
Fourier transform infrared spectroscopy. On micro level, composite coatings exhibited
porous, homogenous surfaces suggesting strong interfacial interactions between HAP,
CS and Gr.
Agar diffusion testing was performed against Staphylococcus aureus and Escherichia
coli in order to evaluate the antibacterial potential and possible medical applications of
obtained composite coatings. The results indicated excellent antibacterial properties of
the gentamicin-containing coating (HAP/CS/Gr/Gent) with a slightly more pronounced
effect against S. aureus compared to E. coli. Composite coatings were also subjected to
cytotoxicity MTT assay to prove the biocompatibility and non-cytotoxic effect towards
MRC-5 and L292 cell lines. Obtained results indicated the high potential of HAP/CS/Gr/Gent coating for use in medicine as a part of bone implants
Remedijacioni potencijal ugljeničnih low-cost materijala dobijenih hidrotermalnom karbonizacijom otpadne biomase
No full textU cilju razvoja održivih metoda sekvestracije organskih polutanata u sedimentu primenom ugljeničnih "low-cost" materijala, biomase rezanca šećerne repice (R) i miskantusa (M) su konvertovane hidrotermalnom karbonizacijom na tri temperature (180°C, 200°C, 220°C). Kao predstavnici perzistentnih organskih polutanata izabrani su pentahlorbenzen (POeCB), heksahlorbenzen (HCB). Šaržni testovi imobilizacije organskih polutanata u sedimentu sprovedeni su primenom tri doze produktivnih materijala (1%, 5% i 10%), kao i ispitivanjem efekta starenja dobijenih smeša nakon tri vremena uravnoteženja(14, 90 i 180 dana). Dobijeni rezultati pokazali su da potencijal primene produkovanih hidročađi značajno zavisi od (1) strukture polazne biomase, (2) procesnih uslova konverzije biomase i (3) fizičko-hemijskih osobina polutanata