Ljiljana Damjanović-Vasilić

University of Belgrade · Faculty of Physical Chemistry

An ion-exchange procedure of synthetic zeolite ZSM-5 (Si/Al = 15) was used to prepare three cobalt ZSM-5 zeolites (CoM-ZSM5 (M = Zn and Ni)) that were examined for OERs in alkaline media. The structural, morphological, and surface properties of the prepared materials were studied by X-ray powder diffraction, Fourier transform infrared spectroscopy,...

Zeolite ZSM-5 and zeolite β were modified by aqueous ion exchange with cerium and then calcined (cal) to obtain Ce-ZSM-5, Ce-ZSM-5 cal, Ce-β, and Ce-β cal electrocatalysts. X-ray powder diffraction analysis, Fourier Ttransform infrared spectroscopy, scanning electron microscopy with energy dispersive spectroscopy, X-ray photoelectron spectroscopy,...

Photocatalytic degradation of bisphenol A (BPA) was investigated using commercial TiO2 P25 nanoparticles supported on natural zeolite clinoptilolite (Cli). Employing ultrasound assisted solid-state dispersion method hybrid photocatalyst containing 20 wt% of TiO2, marked TCli-20, was prepared. The structural, morphological and surface properties, an...

The preparation and characterization of oxide coatings made by plasma electrolytic oxidation (PEO) process on aluminum in two different electrolyte solutions of opposite pH values with addition of Ce-enriched ZSM-5 zeolite are investigated in this paper. The first selected electrolyte solution is highly acidic pH < 3, prepared with tungstosilicic a...

Citation: Lužanin, O.; Gudurić, V.; Bernhardt, A.; Movrin, D.; Damjanović-Vasilić, L.; Terek, P.; Ostojić, G.; Stankovski, S. Abstract: Due to affordability, and the ability to parametrically control the vital processing parameters, material extrusion is a widely accepted technology in tissue engineering. Material extrusion offers sufficient contro...

Four cerium-zeolites were examined as low-cost bifunctional electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in an alkaline solution. Cerium-exchanged zeolites, synthetic 13X and natural clinoptilolite were employed as prepared and calcined (cal). Four samples (Ce-13X cal, Ce-13X, Ce-Cli cal, and Ce-Cli) were...

Recently the successful formation of PEO coatings on zinc in a phosphate aluminate electrolyte was shown. The produced composite coatings contain various mixtures of ZnO and ZnAl$_2$O$_4$. In frame of the current study, the properties of the formed coatings including adhesion/cohesion, wear, corrosion and photocatalytic activity were analysed to id...

The preparation and properties of zeolite-containing oxide coatings obtained by plasma electrolytic oxidation are investigated and discussed. Pure and Ce-exchanged natural (clinoptilolite) and synthetic (13X) zeolites are immobilized on aluminum support from silicate-based electrolyte. Obtained coatings are characterized with respect to their morph...

Dear Colleagues, We are very glad to announce that the Eight Balkan Symposium on Archaeometry (BSA 8) will be held on the 3 rd-6 th October 2022 in Belgrade, Serbia. We are kindly inviting you to take part in the event. Balkans is a bridge, a crossroads whose significance cannot be overestimated. Paleolithic peoples and Neolithic farmers settled Eu...

Removal of the β-blocker atenolol from an aqueous solution was studied using TiO2/zeolites, prepared by a simple and cost-effective solid-state dispersion method. Synthetic zeolites 13X and ZSM-5 (Si/Al = 40) and natural zeolite clinoptilolite were used as one component of the hybrid materials, whereas TiO2 nanocrystals obtained from TiO2 nanotubes...

The preparation and properties of oxide coatings with immobilized ZSM-5 zeolite obtained by plasma electrolytic oxidation on aluminum support are investigated and discussed. Pure and Ce-exchanged ZSM-5 are immobilized on aluminum support from silicate-based electrolyte in ultra-low duty cycle pulsed direct current conditions. Obtained composite coa...

The aim of this study was to demonstrate the potential of Laser-Induced Breakdown Spectroscopy (LIBS) in the analysis of pottery shards, which are commonly the most abundant artefacts recovered at archaeological sites. The analytical capability of LIBS in identification of elements characteristic to inorganic pigments used for decoration was assess...

Dual templating approach, using hexadecyltrimethylammonium bromide (CTAB), was employed in an attempt to synthesize hierarchical ZSM-5 zeolite. Amount of mesoporogen and the duration of aging of the precursor were varied. Majority of the synthesis routes resulted in phase separation, yielding separate ZSM-5 and amorphous mesoporous material. The re...

In this paper, we employed plasma electrolytic oxidation (PEO) of aluminum in a water solution of sodium tungstate (Na2WO4∙2H2O) with the addition of the pure and Ce-loaded zeolites clinoptilolite and 13 X for the preparation of oxide coatings. The obtained coatings were characterized with respect to their morphologies and chemical and phase compos...

The preparation and properties of zeolite-containing oxide coatings obtained by plasma electrolytic oxidation are investigated and discussed. Pure and Ce-exchanged natural (clinoptilolite) and synthetic (13X) zeolites are immobilized on aluminum support from silicate-based electrolyte. Obtained coatings are characterized with respect to their morph...

Plasma electrolytic oxidation (PEO) with in situ anatase particle addition is applied to functionalize the surface of AA2024 alloy. A base potassium titanium oxide oxalate dihydrate aqueous electrolyte is used with up to 30 g L⁻¹ anatase particle addition. The coatings’ morphology and phase composition as a function of the anatase concentration in...

Recently the successful formation of PEO coatings on zinc alloy in a phosphate aluminate electrolyte was shown. The produced composite coatings contain various mixtures of ZnO and ZnAl2O4. In frame of the current study, the properties of the formed coatings including adhesion/cohesion, wear, corrosion and photocatalytic activity were analysed to id...

Plasma electrolytic oxidation (PEO) was applied to functionalise the surface of AA2024 alloy. A potassium titanium-oxide oxalate dihydrate based aqueous electrolyte was used, which allowed the direct formation of a TiO2 surface layer on the aluminium alloy substrate. The effect of PEO treatment time and the additional presence of anatase particles...

Medieval glazed ceramics, dated to the early 15th century, excavated at the Belgrade Fortress, Serbia, were investigated by combining optical microscopy, X-ray powder diffraction (XRPD), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), micro-Raman spectroscopy and multivariate statistical analysis. The decoration and styl...

A collection of 63 pottery shards excavated at the Studenica Monastery, Serbia, originating from two distinct cultural strata (late 12th until the late 13th century, and the 14th and the first half of 15th century) was subject of this work. Mineralogical and chemical composition of body and glaze and production technology of investigated pottery we...

The chemical and mineralogical composition of ceramic bodies, glazes and pigments, as well as the firing temperatures of main groups of Austrian period painted pottery excavated at the Belgrade Fortress on the territory of Serbia, two groups of Malhornware and one group of Anabaptist faience, were determined by a combination of powder X-ray diffrac...

The competitive adsorption of aromatic hydrocarbons (benzene, methyl- and ethyl-benzene) and water on FeZSM-5 zeolites have been investigated by means of temperature-programmed desorption coupled with mass spectrometry (TPD/MS). The incorporation of iron in zeolite was done by aqueous ion exchange using dilute solutions of Fe complexes (ferric citr...

Room temperature adsorption of CO and N2O using isothermal calorimetry and in situ FTIR spectroscopy on bimetallic and monometallic forms of Cu, Fe and Mn exchanged zeolite ZSM-5 was studied. The two complementary techniques allowed the assessment of the strengths of interactions as well as the identification of the cations active in adsorption. In...

The thermal behaviour of a Pt(IV) and a Ru(II) complex coordinated to O,O'-di-n-butyl-(S,S)-ethylenediamine-N,N'-di-2-(3-cyclohexyl)propanoate has been investigated using thermogravimetry (TG) and differential scanning calorimetry (DSC). The study included investigation of the thermal decomposition of these complexes in the temperature range of 30...

A study of decorated Neolithic pottery samples from excavation site Pločnik, Serbia, was performed using X-ray powder diffraction (XRPD), Fourier transform infrared (FTIR) and X-ray fluorescence (XRF) spectroscopy. Investigated samples belong to the era of the Vinča culture which existed at the central Balkan region from mid VI until the first half...

A canvas painting by Milo Milunović “The Inspiration of the poet” was studied by energy dispersive X-Ray fluorescence (EDXRF), micro-Raman and Fourier transform infrared (FTIR) spectroscopy in order to identify materials used by the artist and his painting technique. Study is perfomed combining in situ non-destructive method with the preparation an...

This paper provides the correlation between the catalytic activity and selectivity of catalysts with various loadings of heteropolyacids over bentonite in the vapour phase 2-propanol oxidation. The catalysts are characterised by energy dispersive spectroscopy, differential scanning calorimeter, ammonia temperature programmed desorption, infrared sp...

Medieval pottery from excavations at Novo Brdo, Serbia, an important mining and trading centre during the 14th and 15th centuries, was investigated by a combination of optical microscopy, inductively coupled plasma – optical emission spectrometry, Fourier transform infrared, micro-Raman and energy-dispersive X-ray fluorescence spectroscopy and X-ra...

This is an early electronic version of an as-received manuscript that has been accepted for publication in the Journal of the Serbian Chemical Society but has not yet been subjected to the editing process and publishing procedure applied by the JSCS Editorial Office., doi: 10.2298/JSC140722099D This "raw" version of the manuscript is being provided...

9th International Conference on the Occurrence, Properties and Utilization of Natural Zeolites

Russian icon painted on wooden panel analyzed in this work is interesting for art historians because there is no precise information in which workshops it was made or who the author was. Similar icons are often found in churches and monasteries in our region. In order to obtain information about materials used for creation of investigated icon two...

This chapter presents the fundamentals, the experimental setups and the applications of temperature-programmed desorption (TPD), method used to investigate the events that take place at the surface of solid material while its temperature is changed in a controlled manner. At the beginning, fundamental principles of adsorption and desorption phenome...

The deep oxidation of n-hexane was studied over Pt catalysts with small and large Pt crystallites, promoted by MnOx. The Mn was deposited on the Pt/Al2O3 by deposition-precipitation method using two alkalis, ammonia and dimethylamine. The strength of the base influenced morphology and performances of Mn-Pt catalysts. Ammonia formed mostly spherical...

A combined study of a series of polychromatic and monochromatic glazed medieval pottery shards excavated from the archaeological area of Stari (Old) Ras in southern Serbia, including petrographic and chemical analysis, powder X-ray diffraction (PXRD) and Fourier transform infrared (FTIR) spectroscopy, allowed us to clearly distinguish between two g...

In this work we present a calorimetric study of NaBH4 hydrolysis in the presence of Co3O4. NaBH4 can be utilized as source of a high purity hydrogen generated by the hydrolysis reaction (BH4−+4H2O→B(OH)4−+4H2) which is easily controlled by catalysts. A modified Setaram Titrys microcalorimeter was used to determine the enthalpy of hydrolysis in a sy...

This work reports results on phenol adsorption from aqueous solutions on synthetic BEA (β) and MFI (ZSM-5) zeolites, studied by heat-flow microcalorimetry. For the sake of comparison, the adsorption was performed on activated carbon, a solid customarily used for removal of phenol from water. The obtained values of heats evolved during phenol adsorp...

NaBH4 and KBH4 hydrolysis reactions (BH4− + 4H2O → B(OH)4− + 4H2), which can be utilized as a source of high purity hydrogen and be easily controlled catalytically, are exothermic processes. Precise determination of the evolved heat is of outmost importance for the design of the reactor for hydrogen generation. In this work we present an efficient...

The present work is focused on the adsorption of nicotine from aqueous solutions. Based on the data available in the literature, serious concern is claimed regarding the appearance of nicotine in ground, surface and municipal wastewaters. In order to investigate the possibility of abatement by adsorption, three different types of zeolites (BEA, MFI...

Rakic, Vesna Damjanovic, Ljiljana Rac, Vladislav Stosic, Dusan Dondur, Vera Auroux, Aline

Damjanovic, Ljiljana Rakic, Vesna Rac, Vladislav Stosic, Dusan Auroux, Aline

Introduction During the last decade a lot of research effort has been put into the development of suitable and safe technologies for hydrogen storage. Sodium and potassium borohydrides (NaBH 4 and KBH 4) are two interesting materials for future energy applications and in particular for hydrogen storage [1]. They present the advantages of a high pot...

The characterization of the acidity of zeolites and related materials is of great importance for applications of these materials, particularly in the petrochemical industry and environmental sciences. This chapter provides a comparison of the two most widely used techniques for the study of acid/base properties of zeolites, namely temperature-progr...

This chapter discusses various studies in which calorimetry have been used to characterize zeolites, oxides, and metallic catalysts. It is apparent from the results in the literature that microcalorimetry is a very powerful technique even if it does not provide direct information about the molecular nature of the adsorbed species. The chapter descr...

The Li+- and Na+-doped hexacelsians (HC) synthesized from Ba-LTA synthetic zeolite as precursors were used for preparation of monoclinic celsians (MC). The doped pure MC and mixture HC/MC species were obtained by thermally induced polymorphous transformation at 1200 °C. Synthesized-doped MC have been characterized by X-ray powder diffraction and sp...

L-histidine, a naturally occurring amino acid, was incorporated inside the supercages of FAU type zeolite in a form of Me-complex entity (Me = Cu(II), Zn(II), Fe(III)). The preparation was done either by ion-exchange procedure, or previously prepared Me-histidine complex was incorporated into the a cages of Y zeolite by occlusion. The preparation p...

Although early medieval Serbian ceramic is well described by the archeologists and historians, knowledge of the Balkan ceramic production is still limited. Archaeometric study of ceramics provenance, technology of preparation and used pigments as well as influence of neighboring countries and specific characteristics of different workshops has neve...

Artefacts produced or treated at high temperatures provide information about manufacturing techniques. Well preserved ceramic objects are therefore excellent chronological markers as well as general markers of society development. In order to determine provenance of pottery fragments, archaeologists classify samples according to their physical char...

In this work, a series of iron-containing zeolitic materials has been tested as heterogeneous catalysts for decomposition of H 2O 2 and for oxidation of the cationic dye Methylene Blue with H 2O 2 in aqueous solutions. FeAPO and FeBEA zeolites, synthesized through hydrothermal crystallization of basic hydrogels, and FeY and FeZSM-5 zeolites, prepar...

The surface properties of zeolites A, X, Y and natural zeolite clinoptilolite (CLI) functionalized by cationic surfactants were investigated. The quaternary ammonium type surfactants, such as hexadecyltrimethylammonium (HDTMA) chloride, stearildimethylbenzylammonium (SDMBA) chloride and distearildimethylammonium (DSDMA) chloride, replaced inorganic...

Temperature-programmed desorption coupled with mass spectrometer as a detector (TPD), IR and 13C NMR measurements are used to study the adsorption of n-hexane on hydrated HZSM-5 and NH4ZSM-5 zeolites. The 13C NMR measurements show that n-hexane can access the pore structure of ZSM-5 zeolites previously saturated with water. TPD spectra of n-hexane...

A series of hexacelsians with different compositions were synthesized by thermally induced transformation of a LTA zeolite. Various forms of hexacelsians have been characterized by XRPD, IR, Raman and 29Si MAS NMR method. The phase transformation a�b hexacelsian was investigated by DSC method. This phase transformation is sensitive to synthesis con...

The acidic properties of the alkaline earth salts of 12-tungstophosphoric acid were investigated using ammonia absorption microcalorimetry. The number and the strength of acid sites of these catalysts as well as differential heats of ammonia absorption were determined. As a result of substitution of two protons with one alkaline earth cation, the d...

This review summarizes some of the recently published results concerning the acid sites in the zeolites ZSM-5 and Y studied by temperature-programmed desorption (TPD) and adsorption calorimetry using different probe molecules NH3, CO, N2O and n-hexane. For the first time it has been shown that the acid sites in hydrated zeolites are accessible for...

Néel (TN) and Weiss (Θ) temperatures of the alkali-electro-sodalites (AES) loaded with Na or K were investigated as a function of hydrostatic pressure up to 2GPa with a low-frequency ESR technique. TN depends weakly on the pressure, but Θ decreases more sensitively with the pressure. The transfer energies t1 and t2 via the two-kinds of coupling win...

Insulator-Metal transition of a bee electron lattice in the alumino-silicate cage compound, Ag(SiAlO4)6, (A is Na or K) is investigated under high pressure. ESR has been measured to obtain the spin susceptibility that gives the Neel T-N and the Weiss Theta temperatures. They were analysed to give the exchange interactions J(1) and J(2) through the...

We report 27Al-NMR and DC-magnetic susceptibility measurements on recently discovered alkali-electro-sodalite (AES, A=Sodium, Potassium). AES is known to be a Mott insulator consisting of a body-centered-cubic lattice of F-centers. 27Al-NMR measurements demonstrate that SES (S=Sodium) and PES (P=Potassium) undergo an antiferromagnetic transition ar...

Temperature-dependent EPR data of potassium-electro-sodalite (PES), K8[Al6Si6O24](e-)2, are consistent with the occurrence of an antiferromagnetic phase transition at 71±2 K. PES is a Mott insulator which contains an unpaired electron in every sodalite cage. The same transition in sodium-electro-sodalite occurs at a considerably lower temperature (...

Pressure (0–19 kbar) and temperature (4–300 K) dependent EPR study of Sodium-Electro-Sodalite (SES) is presented. SES, which consists of a bcc sub-lattice of F-centers supported by a zeolite-like framework, is known to be a Mott insulator at room temperature. On cooling, SES undergoes an AF transition at 48±2 K providing the first example of an s-e...

AES (A= Na, K) is a Mott insulator at room temperature consisting of a bcc sub-lattice of F-centers, supported by a zeolite-like framework. Each sodalite cage contains an s-like electron trapped by a spherical potential due to four tetrahedrally arranged alkali cations. On cooling, SES and KES undergo an AF transition at about 50 and 70 K respectiv...

The structure of sodium electrosodalite (SES), Na{sub 8}(AlSiO{sub 4}){sub 6}, has been determined at 20 K using synchrotron powder diffraction. Subsequently the electron density was calculated through a periodic unrestricted Hartree-Fock approach and analyzed by topological methods. The F center is found to manifest itself as a maximum in the elec...

The structure of sodium electrosodalite ~SES!, Na8(AlSiO4)6, has been determined at 20 K using synchrotron powder diffraction. Subsequently the electron density was calculated through a periodic unrestricted Hartree-Fock approach and analyzed by topological methods. The F center is found to manifest itself as a maximum in the electron density at a...