TY  - CONF
AU  - Petković, Darija
AU  - Adnađević, Borivoje
AU  - Jovanović, Jelena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12347
PB  - Russia, Dubna : Joint Institute for Nuclear Research
C3  - AYSS-2022 : The XXVI International Scientific Conference of Young Scientists and Specialists
T1  - Linear and non-linear methods applied to fitting non-isothermal kinetic curves of dehydration of PAAG hydrogel swollen to equilibrium and non-equilibrium state
SP  - 190
EP  - 190
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12347
ER  - 

@conference{
author = "Petković, Darija and Adnađević, Borivoje and Jovanović, Jelena",
year = "2022",
publisher = "Russia, Dubna : Joint Institute for Nuclear Research",
journal = "AYSS-2022 : The XXVI International Scientific Conference of Young Scientists and Specialists",
title = "Linear and non-linear methods applied to fitting non-isothermal kinetic curves of dehydration of PAAG hydrogel swollen to equilibrium and non-equilibrium state",
pages = "190-190",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12347"
}

Petković, D., Adnađević, B.,& Jovanović, J.. (2022). Linear and non-linear methods applied to fitting non-isothermal kinetic curves of dehydration of PAAG hydrogel swollen to equilibrium and non-equilibrium state. in AYSS-2022 : The XXVI International Scientific Conference of Young Scientists and Specialists
Russia, Dubna : Joint Institute for Nuclear Research., 190-190.
https://hdl.handle.net/21.15107/rcub_vinar_12347

Petković D, Adnađević B, Jovanović J. Linear and non-linear methods applied to fitting non-isothermal kinetic curves of dehydration of PAAG hydrogel swollen to equilibrium and non-equilibrium state. in AYSS-2022 : The XXVI International Scientific Conference of Young Scientists and Specialists. 2022;:190-190.
https://hdl.handle.net/21.15107/rcub_vinar_12347 .

Petković, Darija, Adnađević, Borivoje, Jovanović, Jelena, "Linear and non-linear methods applied to fitting non-isothermal kinetic curves of dehydration of PAAG hydrogel swollen to equilibrium and non-equilibrium state" in AYSS-2022 : The XXVI International Scientific Conference of Young Scientists and Specialists (2022):190-190,
https://hdl.handle.net/21.15107/rcub_vinar_12347 .

TY  - JOUR
AU  - Lazarević, Nataša
AU  - Adnađević, Borivoj
AU  - Jovanović, Jelena
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/117
AB  - The non-isothermal kinetics of nicotine desorption from precipitated silicon dioxide was investigated. The non-isothermal thermogravimetric curves of nicotine desorption at different heating rates (beta = 5, 10 and 20 K/min) were recorded. The kinetics model of non-isothermal kinetics of nicotine desorption was determined by using the model-fitting and master-plot methods. It was found that non-isothermal nicotine desorption can mathematically describe by the theoretical kinetics model of phase - boundary controlled reaction (contracting volume, i.e., three dimensional shape) - R3. By applying the method of Kissinger and method of invariant kinetic parameters the values of kinetic parameters were determined. It was established that both applied method give almost identical kinetic parameters regardless their theoretical limitations. The dependence of activation energy on the degree of nicotine desorption was determined using the KAS method. It was found that the value of activation energy is independent on the degree of nicotine desorption. The effect of heating mode on the kinetic of nicotine desorption was analyzed. It was established that the type of heating mode (isothermal and non-isothermal) does not influence the mechanism of the formation of the activation complex nor the kinetics model of desorption. The increase in the values of kinetic parameters obtained for non-isothermal heating in comparison to the isothermal ones are explained with the Larsons model of selective transfer of energy. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Thermochimica Acta
T1  - Kinetic analysis of nicotine desorption from silicon dioxide under non-isothermal conditions
VL  - 589
SP  - 100
EP  - 106
DO  - 10.1016/j.tca.2014.05.023
ER  - 

@article{
author = "Lazarević, Nataša and Adnađević, Borivoj and Jovanović, Jelena",
year = "2014",
abstract = "The non-isothermal kinetics of nicotine desorption from precipitated silicon dioxide was investigated. The non-isothermal thermogravimetric curves of nicotine desorption at different heating rates (beta = 5, 10 and 20 K/min) were recorded. The kinetics model of non-isothermal kinetics of nicotine desorption was determined by using the model-fitting and master-plot methods. It was found that non-isothermal nicotine desorption can mathematically describe by the theoretical kinetics model of phase - boundary controlled reaction (contracting volume, i.e., three dimensional shape) - R3. By applying the method of Kissinger and method of invariant kinetic parameters the values of kinetic parameters were determined. It was established that both applied method give almost identical kinetic parameters regardless their theoretical limitations. The dependence of activation energy on the degree of nicotine desorption was determined using the KAS method. It was found that the value of activation energy is independent on the degree of nicotine desorption. The effect of heating mode on the kinetic of nicotine desorption was analyzed. It was established that the type of heating mode (isothermal and non-isothermal) does not influence the mechanism of the formation of the activation complex nor the kinetics model of desorption. The increase in the values of kinetic parameters obtained for non-isothermal heating in comparison to the isothermal ones are explained with the Larsons model of selective transfer of energy. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Thermochimica Acta",
title = "Kinetic analysis of nicotine desorption from silicon dioxide under non-isothermal conditions",
volume = "589",
pages = "100-106",
doi = "10.1016/j.tca.2014.05.023"
}

Lazarević, N., Adnađević, B.,& Jovanović, J.. (2014). Kinetic analysis of nicotine desorption from silicon dioxide under non-isothermal conditions. in Thermochimica Acta, 589, 100-106.
https://doi.org/10.1016/j.tca.2014.05.023

Lazarević N, Adnađević B, Jovanović J. Kinetic analysis of nicotine desorption from silicon dioxide under non-isothermal conditions. in Thermochimica Acta. 2014;589:100-106.
doi:10.1016/j.tca.2014.05.023 .

Lazarević, Nataša, Adnađević, Borivoj, Jovanović, Jelena, "Kinetic analysis of nicotine desorption from silicon dioxide under non-isothermal conditions" in Thermochimica Acta, 589 (2014):100-106,
https://doi.org/10.1016/j.tca.2014.05.023 . .

TY  - CONF
AU  - Lazarević, Nataša
AU  - Jovanović, Jelena
AU  - Adnađević, Borivoj
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9199
AB  - The poly(acrylic acid) hydrogel (PAA) has been suggested as adsorbent
material to treat cobalt-60 in radioactive liquid waste. The kinetics of
isothermal adsorption of cobalt ions from an aqueous solution onto PAA
hydrogel was investigated in the temperature range from 298K to 315 K.
The kinetic model of Co2+ adsorption [1-(1-α)1/3]2=kt, was established by
using the model-fitting method. The kinetic parameters of Co2+ adsorption
(Ea = 41 kJ mol-1, ln [A/min-1]=12) were determined. It was found that
cobalt adsorption was kinetically controlled process which is determined by
the rate of three-dimensional diffusion Co2+ ions (D3).
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Research on treatment of liquid radioactive waste containing cobalt by adsorption on poly(acrilic acid) hydrogel
VL  - G-02-P
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9199
ER  - 

@conference{
author = "Lazarević, Nataša and Jovanović, Jelena and Adnađević, Borivoj",
year = "2014",
abstract = "The poly(acrylic acid) hydrogel (PAA) has been suggested as adsorbent
material to treat cobalt-60 in radioactive liquid waste. The kinetics of
isothermal adsorption of cobalt ions from an aqueous solution onto PAA
hydrogel was investigated in the temperature range from 298K to 315 K.
The kinetic model of Co2+ adsorption [1-(1-α)1/3]2=kt, was established by
using the model-fitting method. The kinetic parameters of Co2+ adsorption
(Ea = 41 kJ mol-1, ln [A/min-1]=12) were determined. It was found that
cobalt adsorption was kinetically controlled process which is determined by
the rate of three-dimensional diffusion Co2+ ions (D3).",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Research on treatment of liquid radioactive waste containing cobalt by adsorption on poly(acrilic acid) hydrogel",
volume = "G-02-P",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9199"
}

Lazarević, N., Jovanović, J.,& Adnađević, B.. (2014). Research on treatment of liquid radioactive waste containing cobalt by adsorption on poly(acrilic acid) hydrogel. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Society of Physical Chemists of Serbia., G-02-P.
https://hdl.handle.net/21.15107/rcub_vinar_9199

Lazarević N, Jovanović J, Adnađević B. Research on treatment of liquid radioactive waste containing cobalt by adsorption on poly(acrilic acid) hydrogel. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2014;G-02-P.
https://hdl.handle.net/21.15107/rcub_vinar_9199 .

Lazarević, Nataša, Jovanović, Jelena, Adnađević, Borivoj, "Research on treatment of liquid radioactive waste containing cobalt by adsorption on poly(acrilic acid) hydrogel" in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry, G-02-P (2014),
https://hdl.handle.net/21.15107/rcub_vinar_9199 .

TY  - JOUR
AU  - Adnađević, Borivoj
AU  - Tasić, Gvozden S.
AU  - Jovanović, Jelena
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4207
AB  - The kinetic of non-isothermal dehydration of equilibrium swollen poly(acrylic acid-co-methacrylic acid) hydrogel (PAM) has been investigated. Thermogravimetric and conversion dehydration curves were recorded at various heating rates 5-30 K min(-1). The conversion dehydration curves at all investigated temperatures can be mathematically described using the logistic regression function in entire. It was found that activation energy complexly changes with the increasing dehydration degree. Physical meaning of the parameters of logistic function (band w) is given. It was established that, during the dehydration, changes in the fluctuating hydrogel structure occur, and that limiting step on the kinetics of hydrogel dehydration have rate of structural rearrangement of hydrogel (actual relaxation mechanism). A procedure for determining the dependence of effective activation energy on temperature and dehydration degree, based on logistic function, is exposed. Possible explanation for the existence of negative values of activation energy in the certain range of temperature, is given. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Thermochimica Acta
T1  - Kinetic of non-isothermal dehydration of equilibrium swollen poly(acrylic acid-co-methacrylic acid) hydrogel
VL  - 512
IS  - 1-2
SP  - 157
EP  - 162
DO  - 10.1016/j.tca.2010.09.019
ER  - 

@article{
author = "Adnađević, Borivoj and Tasić, Gvozden S. and Jovanović, Jelena",
year = "2011",
abstract = "The kinetic of non-isothermal dehydration of equilibrium swollen poly(acrylic acid-co-methacrylic acid) hydrogel (PAM) has been investigated. Thermogravimetric and conversion dehydration curves were recorded at various heating rates 5-30 K min(-1). The conversion dehydration curves at all investigated temperatures can be mathematically described using the logistic regression function in entire. It was found that activation energy complexly changes with the increasing dehydration degree. Physical meaning of the parameters of logistic function (band w) is given. It was established that, during the dehydration, changes in the fluctuating hydrogel structure occur, and that limiting step on the kinetics of hydrogel dehydration have rate of structural rearrangement of hydrogel (actual relaxation mechanism). A procedure for determining the dependence of effective activation energy on temperature and dehydration degree, based on logistic function, is exposed. Possible explanation for the existence of negative values of activation energy in the certain range of temperature, is given. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Thermochimica Acta",
title = "Kinetic of non-isothermal dehydration of equilibrium swollen poly(acrylic acid-co-methacrylic acid) hydrogel",
volume = "512",
number = "1-2",
pages = "157-162",
doi = "10.1016/j.tca.2010.09.019"
}

Adnađević, B., Tasić, G. S.,& Jovanović, J.. (2011). Kinetic of non-isothermal dehydration of equilibrium swollen poly(acrylic acid-co-methacrylic acid) hydrogel. in Thermochimica Acta, 512(1-2), 157-162.
https://doi.org/10.1016/j.tca.2010.09.019

Adnađević B, Tasić GS, Jovanović J. Kinetic of non-isothermal dehydration of equilibrium swollen poly(acrylic acid-co-methacrylic acid) hydrogel. in Thermochimica Acta. 2011;512(1-2):157-162.
doi:10.1016/j.tca.2010.09.019 .

Adnađević, Borivoj, Tasić, Gvozden S., Jovanović, Jelena, "Kinetic of non-isothermal dehydration of equilibrium swollen poly(acrylic acid-co-methacrylic acid) hydrogel" in Thermochimica Acta, 512, no. 1-2 (2011):157-162,
https://doi.org/10.1016/j.tca.2010.09.019 . .

TY  - JOUR
AU  - Adnađević, Borivoj
AU  - Jovanović, Jelena
AU  - Lazarević, Nataša
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4146
AB  - The isothermal kinetic of the release of nicotine from a poly(acrylic acid) (PAA) hydrogel was investigated at temperature range from 26 degrees C to 45 degrees C. Specific shape parameters of the kinetic curves, the period of linearity and saturation time were determined. The change in the specific shape parameters of the kinetic curves with temperature and the kinetic parameters of release of nicotine E(a) and ln A were determined. By applying the model fitting method it was established that the kinetic model of release of nicotine from the PAA hydrogel was [1 - (1 - alpha)(1/3)] = k(M)t. The limiting stage of the kinetics release of nicotine was found to be the contracting volume of the interaction interface. The distribution function of the activation energy was determined and the most probable values of activation energies of 25.5 kJ mol(-1) and 35 kJ mol(-1) were obtained. Energetically heterogeneity of the interaction interface was explained by the existence of the two different modes of bonding the nicotine molecules onto the hydrogel network by hydrogen bond and electrostatic forces. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 1805-1812, 2011
T2  - Journal of Applied Polymer Science
T1  - Kinetics Study of Isothermal Nicotine Release from Poly(acrylic acid) Hydrogel
VL  - 119
IS  - 3
SP  - 1805
EP  - 1812
DO  - 10.1002/app.32869
ER  - 

@article{
author = "Adnađević, Borivoj and Jovanović, Jelena and Lazarević, Nataša",
year = "2011",
abstract = "The isothermal kinetic of the release of nicotine from a poly(acrylic acid) (PAA) hydrogel was investigated at temperature range from 26 degrees C to 45 degrees C. Specific shape parameters of the kinetic curves, the period of linearity and saturation time were determined. The change in the specific shape parameters of the kinetic curves with temperature and the kinetic parameters of release of nicotine E(a) and ln A were determined. By applying the model fitting method it was established that the kinetic model of release of nicotine from the PAA hydrogel was [1 - (1 - alpha)(1/3)] = k(M)t. The limiting stage of the kinetics release of nicotine was found to be the contracting volume of the interaction interface. The distribution function of the activation energy was determined and the most probable values of activation energies of 25.5 kJ mol(-1) and 35 kJ mol(-1) were obtained. Energetically heterogeneity of the interaction interface was explained by the existence of the two different modes of bonding the nicotine molecules onto the hydrogel network by hydrogen bond and electrostatic forces. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 1805-1812, 2011",
journal = "Journal of Applied Polymer Science",
title = "Kinetics Study of Isothermal Nicotine Release from Poly(acrylic acid) Hydrogel",
volume = "119",
number = "3",
pages = "1805-1812",
doi = "10.1002/app.32869"
}

Adnađević, B., Jovanović, J.,& Lazarević, N.. (2011). Kinetics Study of Isothermal Nicotine Release from Poly(acrylic acid) Hydrogel. in Journal of Applied Polymer Science, 119(3), 1805-1812.
https://doi.org/10.1002/app.32869

Adnađević B, Jovanović J, Lazarević N. Kinetics Study of Isothermal Nicotine Release from Poly(acrylic acid) Hydrogel. in Journal of Applied Polymer Science. 2011;119(3):1805-1812.
doi:10.1002/app.32869 .

Adnađević, Borivoj, Jovanović, Jelena, Lazarević, Nataša, "Kinetics Study of Isothermal Nicotine Release from Poly(acrylic acid) Hydrogel" in Journal of Applied Polymer Science, 119, no. 3 (2011):1805-1812,
https://doi.org/10.1002/app.32869 . .

TY  - JOUR
AU  - Lazarević, Nataša
AU  - Adnađević, Borivoj
AU  - Jovanović, Jelena
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4333
AB  - The isothermal adsorption of nicotine from an aqueous solution onto zeolite type USY was investigated. The adsorption isotherms of nicotine onto the zeolite at different temperatures ranging from 298 to 322K were determined. It was found that the adsorption isotherms can be described by the model of Freundlich adsorption isotherm. Based on the adsorption isotherms the changes of adsorption heat, free energy and entropy with adsorption degree were determined. The determined decrease of adsorption heat with adsorption degree can be explained by the presence of the adsorption centers of different energy and concentration on interface of zeolite-nicotine solution. It was found that the probability function of density distribution of the heat of adsorption (DDF) has exponential form. It was concluded that the possibility of fitting the adsorption isotherms of nicotine onto the zeolite by Freundlich adsorption isotherm was a direct consequence of that. The determined increase in entropy with the increase in adsorption degree can be explained with the change of phase state of adsorbed nicotine. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Adsorption of nicotine from aqueous solution onto hydrophobic zeolite type USY
VL  - 257
IS  - 18
SP  - 8017
EP  - 8023
DO  - 10.1016/j.apsusc.2011.04.076
ER  - 

@article{
author = "Lazarević, Nataša and Adnađević, Borivoj and Jovanović, Jelena",
year = "2011",
abstract = "The isothermal adsorption of nicotine from an aqueous solution onto zeolite type USY was investigated. The adsorption isotherms of nicotine onto the zeolite at different temperatures ranging from 298 to 322K were determined. It was found that the adsorption isotherms can be described by the model of Freundlich adsorption isotherm. Based on the adsorption isotherms the changes of adsorption heat, free energy and entropy with adsorption degree were determined. The determined decrease of adsorption heat with adsorption degree can be explained by the presence of the adsorption centers of different energy and concentration on interface of zeolite-nicotine solution. It was found that the probability function of density distribution of the heat of adsorption (DDF) has exponential form. It was concluded that the possibility of fitting the adsorption isotherms of nicotine onto the zeolite by Freundlich adsorption isotherm was a direct consequence of that. The determined increase in entropy with the increase in adsorption degree can be explained with the change of phase state of adsorbed nicotine. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Adsorption of nicotine from aqueous solution onto hydrophobic zeolite type USY",
volume = "257",
number = "18",
pages = "8017-8023",
doi = "10.1016/j.apsusc.2011.04.076"
}

Lazarević, N., Adnađević, B.,& Jovanović, J.. (2011). Adsorption of nicotine from aqueous solution onto hydrophobic zeolite type USY. in Applied Surface Science, 257(18), 8017-8023.
https://doi.org/10.1016/j.apsusc.2011.04.076

Lazarević N, Adnađević B, Jovanović J. Adsorption of nicotine from aqueous solution onto hydrophobic zeolite type USY. in Applied Surface Science. 2011;257(18):8017-8023.
doi:10.1016/j.apsusc.2011.04.076 .

Lazarević, Nataša, Adnađević, Borivoj, Jovanović, Jelena, "Adsorption of nicotine from aqueous solution onto hydrophobic zeolite type USY" in Applied Surface Science, 257, no. 18 (2011):8017-8023,
https://doi.org/10.1016/j.apsusc.2011.04.076 . .

TY  - JOUR
AU  - Adnađević, Borivoj
AU  - Lazarević, Nataša
AU  - Jovanović, Jelena
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4109
AB  - The isothermal kinetics of nicotine desorption from silicon dioxide (SiO(2)) was investigated. The isothermal thermogravimetric curves of nicotine at temperatures of 115 degrees C, 130 degrees C and 152 degrees C were recorded. The kinetic parameters (E(a), lnA) of desorption of nicotine were calculated using various methods (stationary point, model constants and differential isoconversion method). By applying the model-fitting method, it was found that the kinetic model of nicotine desorption from silicon dioxide was a phase boundary controlled reaction (contracting volume). The values of the kinetic parameters, E(a,alpha) and lnA(alpha), complexly change with changing degree of desorption and a compensation effect exists. A new mechanism of activation for the desorption of the absorbed molecules of nicotine was suggested in agreement with model of selective energy transfer. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - A study of the kinetics of isothermal nicotine desorption from silicon dioxide
VL  - 257
IS  - 5
SP  - 1425
EP  - 1430
DO  - 10.1016/j.apsusc.2010.08.055
ER  - 

@article{
author = "Adnađević, Borivoj and Lazarević, Nataša and Jovanović, Jelena",
year = "2010",
abstract = "The isothermal kinetics of nicotine desorption from silicon dioxide (SiO(2)) was investigated. The isothermal thermogravimetric curves of nicotine at temperatures of 115 degrees C, 130 degrees C and 152 degrees C were recorded. The kinetic parameters (E(a), lnA) of desorption of nicotine were calculated using various methods (stationary point, model constants and differential isoconversion method). By applying the model-fitting method, it was found that the kinetic model of nicotine desorption from silicon dioxide was a phase boundary controlled reaction (contracting volume). The values of the kinetic parameters, E(a,alpha) and lnA(alpha), complexly change with changing degree of desorption and a compensation effect exists. A new mechanism of activation for the desorption of the absorbed molecules of nicotine was suggested in agreement with model of selective energy transfer. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "A study of the kinetics of isothermal nicotine desorption from silicon dioxide",
volume = "257",
number = "5",
pages = "1425-1430",
doi = "10.1016/j.apsusc.2010.08.055"
}

Adnađević, B., Lazarević, N.,& Jovanović, J.. (2010). A study of the kinetics of isothermal nicotine desorption from silicon dioxide. in Applied Surface Science, 257(5), 1425-1430.
https://doi.org/10.1016/j.apsusc.2010.08.055

Adnađević B, Lazarević N, Jovanović J. A study of the kinetics of isothermal nicotine desorption from silicon dioxide. in Applied Surface Science. 2010;257(5):1425-1430.
doi:10.1016/j.apsusc.2010.08.055 .

Adnađević, Borivoj, Lazarević, Nataša, Jovanović, Jelena, "A study of the kinetics of isothermal nicotine desorption from silicon dioxide" in Applied Surface Science, 257, no. 5 (2010):1425-1430,
https://doi.org/10.1016/j.apsusc.2010.08.055 . .