TY  - CONF
AU  - Trajković, Dušan
AU  - Vukčević, Marija
AU  - Maletić, Marina
AU  - Trivunac, Katarina
AU  - Perić Grujić, Aleksandra
AU  - Živojinović, Dragana
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6640
AB  - The immense quantity of industrial waste is a global problem that requires new solutions in accordance with the principles of circular economy and sustainable development. Therefore, in this work, fly ash obtained as waste from thermal power plants was used as an adsorbent for the removal of pharmaceutical residues from water. To improve the adsorption efficiency of fly ash, different modification methods were applied. Obtained adsorbents were characterized by SEM and FTIR. In order to improve the adsorption characteristics, the adsorption parameters were optimized (volume, initial concentration, and pH value of adsorbate solution, adsorbent mass, and contact time between adsorbent and adsorbate). Artificial neural networks were applied to establish the correlation between the examined adsorption parameters and to define the parameters having the greatest influence on the adsorption efficiency. The chemometric approach enabled the reduction of variables, i.e., the number of experiments necessary for the optimization of pharmaceutical residue adsorption onto modified fly ash, giving a good basis for the commercial application of fly ash in the field of wastewater treatment.
PB  - Skopje : Society of Chemists and Technologists of Macedonia
C3  - Book of abstracts / 26th Congress of SCTM with international participation 20–23 September 2023 Metropol Lake Resort Ohrid, R. Macedonia
T1  - Modified Fly Ash for Adsorption of Pharmaceuticals from Water: Chemometric Approach to the Optimization of Adsorption Method
SP  - 114
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6640
ER  - 

@conference{
author = "Trajković, Dušan and Vukčević, Marija and Maletić, Marina and Trivunac, Katarina and Perić Grujić, Aleksandra and Živojinović, Dragana",
year = "2023",
abstract = "The immense quantity of industrial waste is a global problem that requires new solutions in accordance with the principles of circular economy and sustainable development. Therefore, in this work, fly ash obtained as waste from thermal power plants was used as an adsorbent for the removal of pharmaceutical residues from water. To improve the adsorption efficiency of fly ash, different modification methods were applied. Obtained adsorbents were characterized by SEM and FTIR. In order to improve the adsorption characteristics, the adsorption parameters were optimized (volume, initial concentration, and pH value of adsorbate solution, adsorbent mass, and contact time between adsorbent and adsorbate). Artificial neural networks were applied to establish the correlation between the examined adsorption parameters and to define the parameters having the greatest influence on the adsorption efficiency. The chemometric approach enabled the reduction of variables, i.e., the number of experiments necessary for the optimization of pharmaceutical residue adsorption onto modified fly ash, giving a good basis for the commercial application of fly ash in the field of wastewater treatment.",
publisher = "Skopje : Society of Chemists and Technologists of Macedonia",
journal = "Book of abstracts / 26th Congress of SCTM with international participation 20–23 September 2023 Metropol Lake Resort Ohrid, R. Macedonia",
title = "Modified Fly Ash for Adsorption of Pharmaceuticals from Water: Chemometric Approach to the Optimization of Adsorption Method",
pages = "114",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6640"
}

Trajković, D., Vukčević, M., Maletić, M., Trivunac, K., Perić Grujić, A.,& Živojinović, D.. (2023). Modified Fly Ash for Adsorption of Pharmaceuticals from Water: Chemometric Approach to the Optimization of Adsorption Method. in Book of abstracts / 26th Congress of SCTM with international participation 20–23 September 2023 Metropol Lake Resort Ohrid, R. Macedonia
Skopje : Society of Chemists and Technologists of Macedonia., 114.
https://hdl.handle.net/21.15107/rcub_technorep_6640

Trajković D, Vukčević M, Maletić M, Trivunac K, Perić Grujić A, Živojinović D. Modified Fly Ash for Adsorption of Pharmaceuticals from Water: Chemometric Approach to the Optimization of Adsorption Method. in Book of abstracts / 26th Congress of SCTM with international participation 20–23 September 2023 Metropol Lake Resort Ohrid, R. Macedonia. 2023;:114.
https://hdl.handle.net/21.15107/rcub_technorep_6640 .

Trajković, Dušan, Vukčević, Marija, Maletić, Marina, Trivunac, Katarina, Perić Grujić, Aleksandra, Živojinović, Dragana, "Modified Fly Ash for Adsorption of Pharmaceuticals from Water: Chemometric Approach to the Optimization of Adsorption Method" in Book of abstracts / 26th Congress of SCTM with international participation 20–23 September 2023 Metropol Lake Resort Ohrid, R. Macedonia (2023):114,
https://hdl.handle.net/21.15107/rcub_technorep_6640 .

TY  - JOUR
AU  - Trajković, Dušan
AU  - Savić, Marija
AU  - Kostić, Mirjana
AU  - Majstorović, Divna
AU  - Stojanović, Petar
AU  - Stepanović, Jovan
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3730
AB  - In the false twist texturing process, due to the action of mechanical forces and heat, a disorientation of structural elements happens at all levels of the supramolecular structure. These changes are related to changes in the texturing parameters and mechanical properties of yarn. In this paper, investigated is the effect of technical-technological texturing parameters in the false twist texturing process on the structure of PA6.6 yarns. POY multifilament PA6.6 with a fineness of 22f07x1 dtex was used as experimental material. The yarn was textured on a friction texturing machine -ICBT model FT 15 E3. The exiting yarn speed (Vi) changed as 600, 700, 800 and 900 m/min; the heater temperature (T) was 200, 210 and 220 degrees C, and the ratio of the disk surface speed to the linear yarn speed (D/Y) was 1.9 and 2.1. The values of strain were kept constant at 1.305 (tension in texturing zone) and 0,954 in the winding zone. Analysed were the density, degree of crystallinity, degree of orientation, single filament diameter, the content of -NH2 and -COOH end groups, and the total content of end groups. From the results obtained it can be seen that the effect of the heater temperature is more significant than that of Vi and D/Y on the structural characteristics analysed. Analysing the experimental results it was found that linear positive correlations were established between the texturing speed and end (-NH2) groups, the texturing speed and end (-COOH) groups and the texturing speed and the total content of end groups. The correlation factor between the process parameters and yarn structural characteristics analysed is determined.
PB  - Inst Chemical Fibres, Lodz
T2  - Fibres & Textiles in Eastern Europe
T1  - Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process
EP  - 85
IS  - 3
SP  - 79
VL  - 25
DO  - 10.5604/12303666.1237241
ER  - 

@article{
author = "Trajković, Dušan and Savić, Marija and Kostić, Mirjana and Majstorović, Divna and Stojanović, Petar and Stepanović, Jovan",
year = "2017",
abstract = "In the false twist texturing process, due to the action of mechanical forces and heat, a disorientation of structural elements happens at all levels of the supramolecular structure. These changes are related to changes in the texturing parameters and mechanical properties of yarn. In this paper, investigated is the effect of technical-technological texturing parameters in the false twist texturing process on the structure of PA6.6 yarns. POY multifilament PA6.6 with a fineness of 22f07x1 dtex was used as experimental material. The yarn was textured on a friction texturing machine -ICBT model FT 15 E3. The exiting yarn speed (Vi) changed as 600, 700, 800 and 900 m/min; the heater temperature (T) was 200, 210 and 220 degrees C, and the ratio of the disk surface speed to the linear yarn speed (D/Y) was 1.9 and 2.1. The values of strain were kept constant at 1.305 (tension in texturing zone) and 0,954 in the winding zone. Analysed were the density, degree of crystallinity, degree of orientation, single filament diameter, the content of -NH2 and -COOH end groups, and the total content of end groups. From the results obtained it can be seen that the effect of the heater temperature is more significant than that of Vi and D/Y on the structural characteristics analysed. Analysing the experimental results it was found that linear positive correlations were established between the texturing speed and end (-NH2) groups, the texturing speed and end (-COOH) groups and the texturing speed and the total content of end groups. The correlation factor between the process parameters and yarn structural characteristics analysed is determined.",
publisher = "Inst Chemical Fibres, Lodz",
journal = "Fibres & Textiles in Eastern Europe",
title = "Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process",
pages = "85-79",
number = "3",
volume = "25",
doi = "10.5604/12303666.1237241"
}

Trajković, D., Savić, M., Kostić, M., Majstorović, D., Stojanović, P.,& Stepanović, J.. (2017). Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process. in Fibres & Textiles in Eastern Europe
Inst Chemical Fibres, Lodz., 25(3), 79-85.
https://doi.org/10.5604/12303666.1237241

Trajković D, Savić M, Kostić M, Majstorović D, Stojanović P, Stepanović J. Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process. in Fibres & Textiles in Eastern Europe. 2017;25(3):79-85.
doi:10.5604/12303666.1237241 .

Trajković, Dušan, Savić, Marija, Kostić, Mirjana, Majstorović, Divna, Stojanović, Petar, Stepanović, Jovan, "Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process" in Fibres & Textiles in Eastern Europe, 25, no. 3 (2017):79-85,
https://doi.org/10.5604/12303666.1237241 . .

TY  - JOUR
AU  - Savić, Marija
AU  - Trajković, Dušan
AU  - Stepanović, Jovan
AU  - Stojanović, Petar
AU  - Kostić, Mirjana
AU  - Majstorović, Divna
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3480
AB  - In this paper, the effect of technical and technological parameters in false twist texturing on physical-mechanical properties of polyamide yarns was studied. Partially oriented (POY) multifilament with fineness of 22f07x1 dtex was textured under factory conditions on a friction texturing ICBT model FT 15 E3 machine. Using low temperature long heaters the influence of heater temperature and texturing speed on crimping, shrinking and breaking characteristics of yarn was investigated. Thereby, the values for the ratio of surface speed of disks to linear yarn speed, (D/Y), of 1.9, and tension in texturing zone (stretching) of 1.305 and in winding zone of 0.954, were kept constant. The investigated texturing parameters affect the change of these characteristics to varying degrees. For heater temperatures of 200, 210 and 220 degrees C, linear negative correlation was found between the texturing speed, indicator of crimping and texturing speed and breaking characteristics, while the positive correlation was established between the speed of texturing and shrinkage. It was determined the correlation factor between the texturing process parameters and the analysed properties of the yarn. Based on the obtained results it can be concluded that with the established correlation between the speed of texturing and the investigated properties of the yarn, the correlation factor increases with the increase in heater temperature to 210 degrees C. However, at the temperature of 220 degrees C, generally in most cases this value decreases. Therefore, in this study, the optimum temperature of the heater is 210 degrees C, taking into account the selection of other parameter values of the D/Y ratio and stretching.
PB  - Inst Natl Cercetare-Dezvoltare Textile Pielarie-Bucuresti, Bucuresti
T2  - Industria Textila
T1  - Influence of heater temperature and texturing speed on the physical-mechanical properties of polyamide textured yarns in false-twist texturing process
EP  - 457
IS  - 6
SP  - 451
VL  - 68
DO  - 10.35530/it.068.06.1482
ER  - 

@article{
author = "Savić, Marija and Trajković, Dušan and Stepanović, Jovan and Stojanović, Petar and Kostić, Mirjana and Majstorović, Divna",
year = "2017",
abstract = "In this paper, the effect of technical and technological parameters in false twist texturing on physical-mechanical properties of polyamide yarns was studied. Partially oriented (POY) multifilament with fineness of 22f07x1 dtex was textured under factory conditions on a friction texturing ICBT model FT 15 E3 machine. Using low temperature long heaters the influence of heater temperature and texturing speed on crimping, shrinking and breaking characteristics of yarn was investigated. Thereby, the values for the ratio of surface speed of disks to linear yarn speed, (D/Y), of 1.9, and tension in texturing zone (stretching) of 1.305 and in winding zone of 0.954, were kept constant. The investigated texturing parameters affect the change of these characteristics to varying degrees. For heater temperatures of 200, 210 and 220 degrees C, linear negative correlation was found between the texturing speed, indicator of crimping and texturing speed and breaking characteristics, while the positive correlation was established between the speed of texturing and shrinkage. It was determined the correlation factor between the texturing process parameters and the analysed properties of the yarn. Based on the obtained results it can be concluded that with the established correlation between the speed of texturing and the investigated properties of the yarn, the correlation factor increases with the increase in heater temperature to 210 degrees C. However, at the temperature of 220 degrees C, generally in most cases this value decreases. Therefore, in this study, the optimum temperature of the heater is 210 degrees C, taking into account the selection of other parameter values of the D/Y ratio and stretching.",
publisher = "Inst Natl Cercetare-Dezvoltare Textile Pielarie-Bucuresti, Bucuresti",
journal = "Industria Textila",
title = "Influence of heater temperature and texturing speed on the physical-mechanical properties of polyamide textured yarns in false-twist texturing process",
pages = "457-451",
number = "6",
volume = "68",
doi = "10.35530/it.068.06.1482"
}

Savić, M., Trajković, D., Stepanović, J., Stojanović, P., Kostić, M.,& Majstorović, D.. (2017). Influence of heater temperature and texturing speed on the physical-mechanical properties of polyamide textured yarns in false-twist texturing process. in Industria Textila
Inst Natl Cercetare-Dezvoltare Textile Pielarie-Bucuresti, Bucuresti., 68(6), 451-457.
https://doi.org/10.35530/it.068.06.1482

Savić M, Trajković D, Stepanović J, Stojanović P, Kostić M, Majstorović D. Influence of heater temperature and texturing speed on the physical-mechanical properties of polyamide textured yarns in false-twist texturing process. in Industria Textila. 2017;68(6):451-457.
doi:10.35530/it.068.06.1482 .

Savić, Marija, Trajković, Dušan, Stepanović, Jovan, Stojanović, Petar, Kostić, Mirjana, Majstorović, Divna, "Influence of heater temperature and texturing speed on the physical-mechanical properties of polyamide textured yarns in false-twist texturing process" in Industria Textila, 68, no. 6 (2017):451-457,
https://doi.org/10.35530/it.068.06.1482 . .

TY  - JOUR
AU  - Stojanović, Petar
AU  - Savić, Marija
AU  - Trajković, Dušan
AU  - Stepanović, Jovan
AU  - Stamenković, Miodrag
AU  - Kostić, Mirjana
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3606
AB  - In this paper, the effect of false-twist texturing parameters (texturing speed, heater temperature, draw ratio and disc-to-yarn speed ratio (D/Y ratio)) on the structure and crimp properties of polyester yarn has been studied using a high temperature heater and high texturing speeds. Textured yarn was analyzed and characterized in terms of the degree of crystallinity, degree of orientation and crimp properties (crimp contraction, crimp module and crimp stability). The most important parameters, significantly affecting yarn temperature and its uniformity and thus textured yarn structure and crimp properties, are texturing speed and heater temperature. Depending on these texturing parameters, the degree of crystallinity and orientation varied in the range of 24.48 to 36.66% and 0.371 to 0.595, respectively. The crimp characteristics increase with the increase in heater temperature, and decrease with the increase in texturing speed. The effect of draw ratio and D/Y ratio on the textured yarn structure and properties is less pronounced. Obtained results show that partially oriented polyester yarn used in this study can be textured at significantly higher texturing speed (up to 1100 m/min) than the standard texturing speed (up to 700 m/min) used for the yarn count examined.
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - The effect of false-twist texturing parameters on the structure and crimp properties of polyester yarn
EP  - 419
IS  - 3
SP  - 411
VL  - 23
DO  - 10.2298/CICEQ160720055S
ER  - 

@article{
author = "Stojanović, Petar and Savić, Marija and Trajković, Dušan and Stepanović, Jovan and Stamenković, Miodrag and Kostić, Mirjana",
year = "2017",
abstract = "In this paper, the effect of false-twist texturing parameters (texturing speed, heater temperature, draw ratio and disc-to-yarn speed ratio (D/Y ratio)) on the structure and crimp properties of polyester yarn has been studied using a high temperature heater and high texturing speeds. Textured yarn was analyzed and characterized in terms of the degree of crystallinity, degree of orientation and crimp properties (crimp contraction, crimp module and crimp stability). The most important parameters, significantly affecting yarn temperature and its uniformity and thus textured yarn structure and crimp properties, are texturing speed and heater temperature. Depending on these texturing parameters, the degree of crystallinity and orientation varied in the range of 24.48 to 36.66% and 0.371 to 0.595, respectively. The crimp characteristics increase with the increase in heater temperature, and decrease with the increase in texturing speed. The effect of draw ratio and D/Y ratio on the textured yarn structure and properties is less pronounced. Obtained results show that partially oriented polyester yarn used in this study can be textured at significantly higher texturing speed (up to 1100 m/min) than the standard texturing speed (up to 700 m/min) used for the yarn count examined.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "The effect of false-twist texturing parameters on the structure and crimp properties of polyester yarn",
pages = "419-411",
number = "3",
volume = "23",
doi = "10.2298/CICEQ160720055S"
}

Stojanović, P., Savić, M., Trajković, D., Stepanović, J., Stamenković, M.,& Kostić, M.. (2017). The effect of false-twist texturing parameters on the structure and crimp properties of polyester yarn. in Chemical Industry & Chemical Engineering Quarterly
Savez hemijskih inženjera, Beograd., 23(3), 411-419.
https://doi.org/10.2298/CICEQ160720055S

Stojanović P, Savić M, Trajković D, Stepanović J, Stamenković M, Kostić M. The effect of false-twist texturing parameters on the structure and crimp properties of polyester yarn. in Chemical Industry & Chemical Engineering Quarterly. 2017;23(3):411-419.
doi:10.2298/CICEQ160720055S .

Stojanović, Petar, Savić, Marija, Trajković, Dušan, Stepanović, Jovan, Stamenković, Miodrag, Kostić, Mirjana, "The effect of false-twist texturing parameters on the structure and crimp properties of polyester yarn" in Chemical Industry & Chemical Engineering Quarterly, 23, no. 3 (2017):411-419,
https://doi.org/10.2298/CICEQ160720055S . .