TY  - JOUR
AU  - Karanac, Milica
AU  - Dolić, Maja B.
AU  - Veljović, Đorđe
AU  - Rajaković-Ognjanović, Vladana
AU  - Veličković, Zlate
AU  - Pavićević, Vladimir
AU  - Marinković, Aleksandar
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/937
AB  - This study focuses on the use of raw fly ash (FA) and modified fly ash - activated by lime (MFA), as effective and low-cost adsorbents for the removal of heavy metals (Zn2+, Pb2+ and As(V)), followed by the revalorization of the exhausted adsorbent. The granulometric, elemental analysis, point of zero charge (pH(pzc), radiochemical and structural characterization were conducted using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and gamma spectrometry techniques. The optimal conditions and key factors influencing the adsorption process were assessed using the response surface method (RSM). The adsorption capacity of the MFA adsorbent for Zn2+, Pb2+ and As(V) removal, calculated by the Langmuir model, was found to be 33.13, 26.06, and 29.71 mg g(-1), respectively. The kinetic and thermodynamic parameters indicated that the adsorption process is spontaneous and endothermic. Due to their low desorption potential of the exhausted adsorbents, their effective reuse was established to be feasible. For this reason, the valorization of this material as an additive in construction materials was thereafter studied, where testing its toxicity leaching (TCLP) as well as the mechanical properties of construction material containing exhausted MFA confirmed its safe use. Hence, this study points to a possible "two-in-one" reuse of coal ash, initially as an adsorbent and later as an additive in a construction material.
PB  - Elsevier Ltd
T2  - Waste Management
T1  - The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent
EP  - 378
SP  - 366
VL  - 78
DO  - 10.1016/j.wasman.2018.05.052
ER  - 

@article{
author = "Karanac, Milica and Dolić, Maja B. and Veljović, Đorđe and Rajaković-Ognjanović, Vladana and Veličković, Zlate and Pavićević, Vladimir and Marinković, Aleksandar",
year = "2018",
abstract = "This study focuses on the use of raw fly ash (FA) and modified fly ash - activated by lime (MFA), as effective and low-cost adsorbents for the removal of heavy metals (Zn2+, Pb2+ and As(V)), followed by the revalorization of the exhausted adsorbent. The granulometric, elemental analysis, point of zero charge (pH(pzc), radiochemical and structural characterization were conducted using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and gamma spectrometry techniques. The optimal conditions and key factors influencing the adsorption process were assessed using the response surface method (RSM). The adsorption capacity of the MFA adsorbent for Zn2+, Pb2+ and As(V) removal, calculated by the Langmuir model, was found to be 33.13, 26.06, and 29.71 mg g(-1), respectively. The kinetic and thermodynamic parameters indicated that the adsorption process is spontaneous and endothermic. Due to their low desorption potential of the exhausted adsorbents, their effective reuse was established to be feasible. For this reason, the valorization of this material as an additive in construction materials was thereafter studied, where testing its toxicity leaching (TCLP) as well as the mechanical properties of construction material containing exhausted MFA confirmed its safe use. Hence, this study points to a possible "two-in-one" reuse of coal ash, initially as an adsorbent and later as an additive in a construction material.",
publisher = "Elsevier Ltd",
journal = "Waste Management",
title = "The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent",
pages = "378-366",
volume = "78",
doi = "10.1016/j.wasman.2018.05.052"
}

Karanac, M., Dolić, M. B., Veljović, Đ., Rajaković-Ognjanović, V., Veličković, Z., Pavićević, V.,& Marinković, A.. (2018). The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent. in Waste Management
Elsevier Ltd., 78, 366-378.
https://doi.org/10.1016/j.wasman.2018.05.052

Karanac M, Dolić MB, Veljović Đ, Rajaković-Ognjanović V, Veličković Z, Pavićević V, Marinković A. The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent. in Waste Management. 2018;78:366-378.
doi:10.1016/j.wasman.2018.05.052 .

Karanac, Milica, Dolić, Maja B., Veljović, Đorđe, Rajaković-Ognjanović, Vladana, Veličković, Zlate, Pavićević, Vladimir, Marinković, Aleksandar, "The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent" in Waste Management, 78 (2018):366-378,
https://doi.org/10.1016/j.wasman.2018.05.052 . .

TY  - CONF
AU  - Markovski, Jasmina
AU  - Hristovski, Kiril D.
AU  - Rajaković-Ognjanović, Vladana
AU  - Marinković, Aleksandar
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/708
AB  - The Republic of Serbia is a good example of a developing country with a water management system that has not been adequately transitioned to address the need of the new socio-economic paradigm. Consequently, more than 30% of generated potable water is lost in transportation, sewage collection and treatment significantly lag behind water supply and only 10% of the collected sewage receiving adequate treatment witch further burdens the already unsatisfying quality of water resources. In order to mitigate the upcoming effects of climate change and successfully manage the water resources for the next generations, the goal of this study is to identify and evaluate the existing barriers that hinder the development and implementation of an integrated national water resources management system. To achieve this goal, water resources management system in Serbia is examined through the prism of regulations, management, engineering, and education, which represent principal pillars of every national socio-economic system. The key findings and the outcomes of this study reveals that an in-depth analysis of existing situation and identification of barriers represent important initial steps in process of developing and implementing an integrated national water management system.
PB  - American Chemical Society
C3  - Water Challenges and Solutions On A Global Scale
T1  - Building a Sustainable Water Management System in the Republic of Serbia: Challenges and Issues
EP  - 283
SP  - 257
VL  - 1206
DO  - 10.1021/bk-2015-1206.ch013
ER  - 

@conference{
author = "Markovski, Jasmina and Hristovski, Kiril D. and Rajaković-Ognjanović, Vladana and Marinković, Aleksandar",
year = "2015",
abstract = "The Republic of Serbia is a good example of a developing country with a water management system that has not been adequately transitioned to address the need of the new socio-economic paradigm. Consequently, more than 30% of generated potable water is lost in transportation, sewage collection and treatment significantly lag behind water supply and only 10% of the collected sewage receiving adequate treatment witch further burdens the already unsatisfying quality of water resources. In order to mitigate the upcoming effects of climate change and successfully manage the water resources for the next generations, the goal of this study is to identify and evaluate the existing barriers that hinder the development and implementation of an integrated national water resources management system. To achieve this goal, water resources management system in Serbia is examined through the prism of regulations, management, engineering, and education, which represent principal pillars of every national socio-economic system. The key findings and the outcomes of this study reveals that an in-depth analysis of existing situation and identification of barriers represent important initial steps in process of developing and implementing an integrated national water management system.",
publisher = "American Chemical Society",
journal = "Water Challenges and Solutions On A Global Scale",
title = "Building a Sustainable Water Management System in the Republic of Serbia: Challenges and Issues",
pages = "283-257",
volume = "1206",
doi = "10.1021/bk-2015-1206.ch013"
}

Markovski, J., Hristovski, K. D., Rajaković-Ognjanović, V.,& Marinković, A.. (2015). Building a Sustainable Water Management System in the Republic of Serbia: Challenges and Issues. in Water Challenges and Solutions On A Global Scale
American Chemical Society., 1206, 257-283.
https://doi.org/10.1021/bk-2015-1206.ch013

Markovski J, Hristovski KD, Rajaković-Ognjanović V, Marinković A. Building a Sustainable Water Management System in the Republic of Serbia: Challenges and Issues. in Water Challenges and Solutions On A Global Scale. 2015;1206:257-283.
doi:10.1021/bk-2015-1206.ch013 .

Markovski, Jasmina, Hristovski, Kiril D., Rajaković-Ognjanović, Vladana, Marinković, Aleksandar, "Building a Sustainable Water Management System in the Republic of Serbia: Challenges and Issues" in Water Challenges and Solutions On A Global Scale, 1206 (2015):257-283,
https://doi.org/10.1021/bk-2015-1206.ch013 . .

TY  - CONF
AU  - Taleb, Khaled
AU  - Markovski, Jasmina
AU  - Hristovski, Kiril
AU  - Rajaković-Ognjanović, Vladana
AU  - Marinković, Aleksandar
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/689
C3  - Abstracts of Papers of the American Chemical Society
T1  - Goethite nanoparticles impregnated cross-linked macroporous polymer for arsenic removal: fullscale system modeling
VL  - 250
UR  - https://hdl.handle.net/21.15107/rcub_grafar_689
ER  - 

@conference{
author = "Taleb, Khaled and Markovski, Jasmina and Hristovski, Kiril and Rajaković-Ognjanović, Vladana and Marinković, Aleksandar",
year = "2015",
journal = "Abstracts of Papers of the American Chemical Society",
title = "Goethite nanoparticles impregnated cross-linked macroporous polymer for arsenic removal: fullscale system modeling",
volume = "250",
url = "https://hdl.handle.net/21.15107/rcub_grafar_689"
}

Taleb, K., Markovski, J., Hristovski, K., Rajaković-Ognjanović, V.,& Marinković, A.. (2015). Goethite nanoparticles impregnated cross-linked macroporous polymer for arsenic removal: fullscale system modeling. in Abstracts of Papers of the American Chemical Society, 250.
https://hdl.handle.net/21.15107/rcub_grafar_689

Taleb K, Markovski J, Hristovski K, Rajaković-Ognjanović V, Marinković A. Goethite nanoparticles impregnated cross-linked macroporous polymer for arsenic removal: fullscale system modeling. in Abstracts of Papers of the American Chemical Society. 2015;250.
https://hdl.handle.net/21.15107/rcub_grafar_689 .

Taleb, Khaled, Markovski, Jasmina, Hristovski, Kiril, Rajaković-Ognjanović, Vladana, Marinković, Aleksandar, "Goethite nanoparticles impregnated cross-linked macroporous polymer for arsenic removal: fullscale system modeling" in Abstracts of Papers of the American Chemical Society, 250 (2015),
https://hdl.handle.net/21.15107/rcub_grafar_689 .

TY  - JOUR
AU  - Ben Issa, Nureddin
AU  - Rajaković-Ognjanović, Vladana
AU  - Marinković, Aleksandar
AU  - Rajaković, Ljubinka V.
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/354
AB  - A simple and efficient method for separation and determination of inorganic arsenic (iAs) and organic arsenic (oAs) in drinking, natural and wastewater was developed. If arsenic is present in water prevailing forms are inorganic acids of As(III) and As(V). oAs can be found in traces as monomethylarsenic acid, MMA(V), and dimethylarsenic acid, DMAs(V). Three types of resins: a strong base anion exchange (SBAE) and two hybrid (HY) resins: HY-Fe and HY-AgCl, based on the activity of hydrated iron oxides and a silver chloride were investigated. It was found that the sorption processes (ion exchange, adsorption and chemisorptions) of arsenic species on SBAE (ion exchange) and HY resins depend on pH values of water. The quantitative separation of molecular and ionic forms of iAs and oAs was achieved by SBAE and pH adjustment, the molecular form of As(III) that exists in the water at pH lt 8.0 was not bonded with SBAE, which was convenient for direct determination of As(III) concentration in the effluent. HY-Fe resin retained all arsenic species except DMAs(V), which makes possible direct measurements of this specie in the effluent. HY-AgCl resin retained all iAs which was convenient for direct determination of oAs species concentration in the effluent. The selective bonding of arsenic species on three types of resins makes possible the development of the procedure for measuring and calculation of all arsenic species in water. In order to determine capacity of resins the preliminary investigations were performed in batch system and fixed bed flow system. Resin capacities were calculated according to breakthrough points in a fixed bed flow system which is the first step in designing of solid phase extraction (SPE) module for arsenic speciation separation and determination. Arsenic adsorption behavior in the presence of impurities showed tolerance with the respect to potential interference of anionic compounds commonly found in natural water. Proposed method was established performing standard procedures: with external standard, certified reference material and standard addition method. Two analytical techniques: the inductively coupled plasma mass spectrometry (ICP-MS) and atomic absorption spectroscopy-hydride generation (AAS-GH) were comparatively applied for the determination of arsenic in all arsenic species in water. ICP-MS detection limit was 0.2 mu g L(-1) and relative standard deviation (RSD) of all arsenic species investigated was between 3.5 and 5.1%.
T2  - Analytica Chimica Acta
T1  - Separation and determination of arsenic species in water by selective exchange and hybrid resins
EP  - 198
IS  - 1
SP  - 191
VL  - 706
DO  - 10.1016/j.aca.2011.08.015
ER  - 

@article{
author = "Ben Issa, Nureddin and Rajaković-Ognjanović, Vladana and Marinković, Aleksandar and Rajaković, Ljubinka V.",
year = "2011",
abstract = "A simple and efficient method for separation and determination of inorganic arsenic (iAs) and organic arsenic (oAs) in drinking, natural and wastewater was developed. If arsenic is present in water prevailing forms are inorganic acids of As(III) and As(V). oAs can be found in traces as monomethylarsenic acid, MMA(V), and dimethylarsenic acid, DMAs(V). Three types of resins: a strong base anion exchange (SBAE) and two hybrid (HY) resins: HY-Fe and HY-AgCl, based on the activity of hydrated iron oxides and a silver chloride were investigated. It was found that the sorption processes (ion exchange, adsorption and chemisorptions) of arsenic species on SBAE (ion exchange) and HY resins depend on pH values of water. The quantitative separation of molecular and ionic forms of iAs and oAs was achieved by SBAE and pH adjustment, the molecular form of As(III) that exists in the water at pH lt 8.0 was not bonded with SBAE, which was convenient for direct determination of As(III) concentration in the effluent. HY-Fe resin retained all arsenic species except DMAs(V), which makes possible direct measurements of this specie in the effluent. HY-AgCl resin retained all iAs which was convenient for direct determination of oAs species concentration in the effluent. The selective bonding of arsenic species on three types of resins makes possible the development of the procedure for measuring and calculation of all arsenic species in water. In order to determine capacity of resins the preliminary investigations were performed in batch system and fixed bed flow system. Resin capacities were calculated according to breakthrough points in a fixed bed flow system which is the first step in designing of solid phase extraction (SPE) module for arsenic speciation separation and determination. Arsenic adsorption behavior in the presence of impurities showed tolerance with the respect to potential interference of anionic compounds commonly found in natural water. Proposed method was established performing standard procedures: with external standard, certified reference material and standard addition method. Two analytical techniques: the inductively coupled plasma mass spectrometry (ICP-MS) and atomic absorption spectroscopy-hydride generation (AAS-GH) were comparatively applied for the determination of arsenic in all arsenic species in water. ICP-MS detection limit was 0.2 mu g L(-1) and relative standard deviation (RSD) of all arsenic species investigated was between 3.5 and 5.1%.",
journal = "Analytica Chimica Acta",
title = "Separation and determination of arsenic species in water by selective exchange and hybrid resins",
pages = "198-191",
number = "1",
volume = "706",
doi = "10.1016/j.aca.2011.08.015"
}

Ben Issa, N., Rajaković-Ognjanović, V., Marinković, A.,& Rajaković, L. V.. (2011). Separation and determination of arsenic species in water by selective exchange and hybrid resins. in Analytica Chimica Acta, 706(1), 191-198.
https://doi.org/10.1016/j.aca.2011.08.015

Ben Issa N, Rajaković-Ognjanović V, Marinković A, Rajaković LV. Separation and determination of arsenic species in water by selective exchange and hybrid resins. in Analytica Chimica Acta. 2011;706(1):191-198.
doi:10.1016/j.aca.2011.08.015 .

Ben Issa, Nureddin, Rajaković-Ognjanović, Vladana, Marinković, Aleksandar, Rajaković, Ljubinka V., "Separation and determination of arsenic species in water by selective exchange and hybrid resins" in Analytica Chimica Acta, 706, no. 1 (2011):191-198,
https://doi.org/10.1016/j.aca.2011.08.015 . .

TY  - CONF
AU  - Trišović, Nataša
AU  - Lazović, Tatjana
AU  - Mitrović, Caslav
AU  - Marinković, Aleksandar
AU  - Lazarević, Mihailo
AU  - Šumarac, Dragoslav
AU  - Golubović, Zoran
PY  - 2010
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/288
AB  - The methods of structural dynamic modification, especially those with their roots in finite element models, have often been described as reanalysis. The present paper deals with the problem of improving of dynamic characteristics some structures. New dynamic modification procedure is given as using distribution of potential and kinetic energy in every finite element is used for analysis. The main goal of dynamic modification is to increase natural frequencies and to increase the difference between them. Some information should be prepared, before setting up the FE model. The first pack of information includes referent pieces of information about the structure: size, material, and boundary conditions. It should be noticed that dynamic response is given primarily through corresponding eigenfrequencies and main oscillation forms as characteristic (typical) variables. Changing them by changing the design parameters of a structure it is possible to achieve (can bring about) requested structural dynamic response. Sensitivity analysis is an important point within the dynamical modification process. Sensitivity analysis represents a collection of mathematical methods for reanalyzing constructions which is, within dynamical modification, related to sensitivity of eigenvalues and eigenvectors. Therefore, the application of sensitivity analysis is limited to construction of segments for which necessary mathematical relations can be determined. If this is not possible, sensitivity analysis is only partially applicable. Dynamical analysis of complex structures can easily be conducted via finite elements modeling. Therefore, while finite element analysis method is highly adequate for modeling complex structures, one of its major drawbacks lies in the usage of large number of degrees of freedom in calculating the exact eigenpairs. This number can amount to few tens of thousands, or even more. To reduce the calculation time it is possible to divide the complex structure into connected substructures and analyze each one separately. The dynamical behavior of each substructure is represented only by a reduced set of eigenpairs of interest, which contributes to significant problem simplification. A more general problem of structural dynamic analysis has three important aspects. Firstly, the observed physical structure is represented by initial finite element model. Modeling is based on numerous idealizing approximations within an exaggerated elaboration of details, which in essence does not significantly improve the accuracy of output data, especially having available powerful computers and appropriate software packages. Optimal alternative is to have the possibility of verifying outputted data that were measured on a prototype or real structure. Secondly, the dynamic characteristics of construction under reanalysis are analyzed. What is basically observed are eigenvalues and main forms of oscillations as characteristic variables that can invoke inadequate actual dynamic behavior. Thirdly, on the basis of analysis of actual dynamic behavior, modification steps are proposed after which a modified model is obtained. Having in mind that mechanical structures are most often very complex, the most convenient modification steps are not easily obtained. Figure 1 shows a simplified triangle of fine reanalysis. Choosing the structural parts most suitable for reanalysis requires the analysis of sensitivity for separate segments to changes in construction. Most importantly, the best result should be obtained with minimal changes. This most frequently involves the icrease in frequency and distance between two neighboring frequencies.
C3  - Latest Trends On Engineering Mechanics, Structures, Engineering Geology
T1  - New procedure for dynamic structural reanalysis
SP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_grafar_288
ER  - 

@conference{
author = "Trišović, Nataša and Lazović, Tatjana and Mitrović, Caslav and Marinković, Aleksandar and Lazarević, Mihailo and Šumarac, Dragoslav and Golubović, Zoran",
year = "2010",
abstract = "The methods of structural dynamic modification, especially those with their roots in finite element models, have often been described as reanalysis. The present paper deals with the problem of improving of dynamic characteristics some structures. New dynamic modification procedure is given as using distribution of potential and kinetic energy in every finite element is used for analysis. The main goal of dynamic modification is to increase natural frequencies and to increase the difference between them. Some information should be prepared, before setting up the FE model. The first pack of information includes referent pieces of information about the structure: size, material, and boundary conditions. It should be noticed that dynamic response is given primarily through corresponding eigenfrequencies and main oscillation forms as characteristic (typical) variables. Changing them by changing the design parameters of a structure it is possible to achieve (can bring about) requested structural dynamic response. Sensitivity analysis is an important point within the dynamical modification process. Sensitivity analysis represents a collection of mathematical methods for reanalyzing constructions which is, within dynamical modification, related to sensitivity of eigenvalues and eigenvectors. Therefore, the application of sensitivity analysis is limited to construction of segments for which necessary mathematical relations can be determined. If this is not possible, sensitivity analysis is only partially applicable. Dynamical analysis of complex structures can easily be conducted via finite elements modeling. Therefore, while finite element analysis method is highly adequate for modeling complex structures, one of its major drawbacks lies in the usage of large number of degrees of freedom in calculating the exact eigenpairs. This number can amount to few tens of thousands, or even more. To reduce the calculation time it is possible to divide the complex structure into connected substructures and analyze each one separately. The dynamical behavior of each substructure is represented only by a reduced set of eigenpairs of interest, which contributes to significant problem simplification. A more general problem of structural dynamic analysis has three important aspects. Firstly, the observed physical structure is represented by initial finite element model. Modeling is based on numerous idealizing approximations within an exaggerated elaboration of details, which in essence does not significantly improve the accuracy of output data, especially having available powerful computers and appropriate software packages. Optimal alternative is to have the possibility of verifying outputted data that were measured on a prototype or real structure. Secondly, the dynamic characteristics of construction under reanalysis are analyzed. What is basically observed are eigenvalues and main forms of oscillations as characteristic variables that can invoke inadequate actual dynamic behavior. Thirdly, on the basis of analysis of actual dynamic behavior, modification steps are proposed after which a modified model is obtained. Having in mind that mechanical structures are most often very complex, the most convenient modification steps are not easily obtained. Figure 1 shows a simplified triangle of fine reanalysis. Choosing the structural parts most suitable for reanalysis requires the analysis of sensitivity for separate segments to changes in construction. Most importantly, the best result should be obtained with minimal changes. This most frequently involves the icrease in frequency and distance between two neighboring frequencies.",
journal = "Latest Trends On Engineering Mechanics, Structures, Engineering Geology",
title = "New procedure for dynamic structural reanalysis",
pages = "57",
url = "https://hdl.handle.net/21.15107/rcub_grafar_288"
}

Trišović, N., Lazović, T., Mitrović, C., Marinković, A., Lazarević, M., Šumarac, D.,& Golubović, Z.. (2010). New procedure for dynamic structural reanalysis. in Latest Trends On Engineering Mechanics, Structures, Engineering Geology, 57.
https://hdl.handle.net/21.15107/rcub_grafar_288

Trišović N, Lazović T, Mitrović C, Marinković A, Lazarević M, Šumarac D, Golubović Z. New procedure for dynamic structural reanalysis. in Latest Trends On Engineering Mechanics, Structures, Engineering Geology. 2010;:57.
https://hdl.handle.net/21.15107/rcub_grafar_288 .

Trišović, Nataša, Lazović, Tatjana, Mitrović, Caslav, Marinković, Aleksandar, Lazarević, Mihailo, Šumarac, Dragoslav, Golubović, Zoran, "New procedure for dynamic structural reanalysis" in Latest Trends On Engineering Mechanics, Structures, Engineering Geology (2010):57,
https://hdl.handle.net/21.15107/rcub_grafar_288 .