TY  - JOUR
AU  - Pejić, Biljana M.
AU  - Vukčević, Marija M.
AU  - Lazić, Biljana D.
AU  - Janjić, Svjetlana D.
AU  - Kostić, Mirjana
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5924
AB  - In this study, waste flax fibers with different levels of cellulosic and noncellulosic components were obtained by oxidative and alkali treatments and used to assess the influence of the fiber’s structural and chemical properties on the biosorption of lead ions. Scanning electron microscopy was used for the characterization of the flax fibers’ surface morphology, while the physicochemical properties of the fibers’ surface were determined by the streaming potential method, and Fourier transform infrared spectroscopy. Alkaline treatment decreased, while oxidative increased the crystallinity index of flax fibers by approximately 10%, due to the changes in the content of cellulosic components. Adsorption of lead ions was studied in detail, including kinetics, isotherms, and thermodynamic parameters analysis. It was shown that the amount and distribution of oxygen-containing groups, originating from cellulosic components, have the highest influence on the adsorption capacity of flax fibers, increasing Langmuir adsorption capacity from 12.76 mg g−1 for untreated to 21.9 and 79.9 mg g−1 for alkali-treated and oxidized fibers, respectively. Obtained negative values of ∆GӨ (−4.874 to −0.807 kJ mol−1) and ∆HӨ (−42.81 to −13.65 kJ mol−1) indicated that the adsorption of lead ions onto flax fibers is a spontaneous and endothermic process, which occurs through electrostatic attraction and ion-exchange. The results presented in this work demonstrate that the waste flax fibers of suitable chemical composition may be used as sustainable and renewable low-cost biosorbents.
T2  - JOURNAL OF NATURAL FIBERS
T1  - The Role of Cellulosic and Noncellulosic Functional Groups in the Biosorption of Lead Ions by Waste Flax Fibers
IS  - 1
SP  - 2140325
VL  - 20
DO  - 10.1080/15440478.2022.2140325
ER  - 

@article{
author = "Pejić, Biljana M. and Vukčević, Marija M. and Lazić, Biljana D. and Janjić, Svjetlana D. and Kostić, Mirjana",
year = "2023",
abstract = "In this study, waste flax fibers with different levels of cellulosic and noncellulosic components were obtained by oxidative and alkali treatments and used to assess the influence of the fiber’s structural and chemical properties on the biosorption of lead ions. Scanning electron microscopy was used for the characterization of the flax fibers’ surface morphology, while the physicochemical properties of the fibers’ surface were determined by the streaming potential method, and Fourier transform infrared spectroscopy. Alkaline treatment decreased, while oxidative increased the crystallinity index of flax fibers by approximately 10%, due to the changes in the content of cellulosic components. Adsorption of lead ions was studied in detail, including kinetics, isotherms, and thermodynamic parameters analysis. It was shown that the amount and distribution of oxygen-containing groups, originating from cellulosic components, have the highest influence on the adsorption capacity of flax fibers, increasing Langmuir adsorption capacity from 12.76 mg g−1 for untreated to 21.9 and 79.9 mg g−1 for alkali-treated and oxidized fibers, respectively. Obtained negative values of ∆GӨ (−4.874 to −0.807 kJ mol−1) and ∆HӨ (−42.81 to −13.65 kJ mol−1) indicated that the adsorption of lead ions onto flax fibers is a spontaneous and endothermic process, which occurs through electrostatic attraction and ion-exchange. The results presented in this work demonstrate that the waste flax fibers of suitable chemical composition may be used as sustainable and renewable low-cost biosorbents.",
journal = "JOURNAL OF NATURAL FIBERS",
title = "The Role of Cellulosic and Noncellulosic Functional Groups in the Biosorption of Lead Ions by Waste Flax Fibers",
number = "1",
pages = "2140325",
volume = "20",
doi = "10.1080/15440478.2022.2140325"
}

Pejić, B. M., Vukčević, M. M., Lazić, B. D., Janjić, S. D.,& Kostić, M.. (2023). The Role of Cellulosic and Noncellulosic Functional Groups in the Biosorption of Lead Ions by Waste Flax Fibers. in JOURNAL OF NATURAL FIBERS, 20(1), 2140325.
https://doi.org/10.1080/15440478.2022.2140325

Pejić BM, Vukčević MM, Lazić BD, Janjić SD, Kostić M. The Role of Cellulosic and Noncellulosic Functional Groups in the Biosorption of Lead Ions by Waste Flax Fibers. in JOURNAL OF NATURAL FIBERS. 2023;20(1):2140325.
doi:10.1080/15440478.2022.2140325 .

Pejić, Biljana M., Vukčević, Marija M., Lazić, Biljana D., Janjić, Svjetlana D., Kostić, Mirjana, "The Role of Cellulosic and Noncellulosic Functional Groups in the Biosorption of Lead Ions by Waste Flax Fibers" in JOURNAL OF NATURAL FIBERS, 20, no. 1 (2023):2140325,
https://doi.org/10.1080/15440478.2022.2140325 . .

TY  - JOUR
AU  - Lazić, Biljana
AU  - Janjić, Svjetlana
AU  - Ivanović, Vesna
AU  - Kostić, Mirjana
AU  - Novak, Bostjan
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7301
AB  - Flax fibers contain cellulose and different impurities (hemicelluloses, lignin, pectin, waxes and fats, mineral salts, natural coloring matter and water soluble compounds). From the ecological and industrial aspect, hydrogen peroxide is the most acceptable component for modification of flax fibers. The aim of the modification of flax fibers is to remove non-cellulose components and improve the fiber quality without significant changing of the mechanical properties. Flax fibers were treated with hydrogen peroxide solutions at concentrations 1%, 2% and 4% at 50 °C, 80 °C and boiling temperature for time period of 60 min. With the removal of non-cellulosic substances from fibers, it has been achieved a high degree of fiber separation and a significant increase of modified fibers fineness. The value for fineness of modified fibers was reduced about 2-4-fold and the modified flax fibers were softer to the hand, unlike unmodified fibers that are very coarse and stiff. However, the weight loss and removal of lignin, which gives the fibers strength, as well as a partial damage of the cellulose itself during the severity of treatment, brought to reduction in the tensile strength of the modified fibers.
PB  - University of Banja Luka, Faculty of Technology
T2  - Journal of Chemists, Technologists and Environmentalists
T1  - Effect of hydrogen-peroxide treatment on the physico-mechanical properties of flax fibers
EP  - 19
IS  - 1
SP  - 14
VL  - 4
DO  - 10.59919/JCTE04202301E219
ER  - 

@article{
author = "Lazić, Biljana and Janjić, Svjetlana and Ivanović, Vesna and Kostić, Mirjana and Novak, Bostjan",
year = "2023",
abstract = "Flax fibers contain cellulose and different impurities (hemicelluloses, lignin, pectin, waxes and fats, mineral salts, natural coloring matter and water soluble compounds). From the ecological and industrial aspect, hydrogen peroxide is the most acceptable component for modification of flax fibers. The aim of the modification of flax fibers is to remove non-cellulose components and improve the fiber quality without significant changing of the mechanical properties. Flax fibers were treated with hydrogen peroxide solutions at concentrations 1%, 2% and 4% at 50 °C, 80 °C and boiling temperature for time period of 60 min. With the removal of non-cellulosic substances from fibers, it has been achieved a high degree of fiber separation and a significant increase of modified fibers fineness. The value for fineness of modified fibers was reduced about 2-4-fold and the modified flax fibers were softer to the hand, unlike unmodified fibers that are very coarse and stiff. However, the weight loss and removal of lignin, which gives the fibers strength, as well as a partial damage of the cellulose itself during the severity of treatment, brought to reduction in the tensile strength of the modified fibers.",
publisher = "University of Banja Luka, Faculty of Technology",
journal = "Journal of Chemists, Technologists and Environmentalists",
title = "Effect of hydrogen-peroxide treatment on the physico-mechanical properties of flax fibers",
pages = "19-14",
number = "1",
volume = "4",
doi = "10.59919/JCTE04202301E219"
}

Lazić, B., Janjić, S., Ivanović, V., Kostić, M.,& Novak, B.. (2023). Effect of hydrogen-peroxide treatment on the physico-mechanical properties of flax fibers. in Journal of Chemists, Technologists and Environmentalists
University of Banja Luka, Faculty of Technology., 4(1), 14-19.
https://doi.org/10.59919/JCTE04202301E219

Lazić B, Janjić S, Ivanović V, Kostić M, Novak B. Effect of hydrogen-peroxide treatment on the physico-mechanical properties of flax fibers. in Journal of Chemists, Technologists and Environmentalists. 2023;4(1):14-19.
doi:10.59919/JCTE04202301E219 .

Lazić, Biljana, Janjić, Svjetlana, Ivanović, Vesna, Kostić, Mirjana, Novak, Bostjan, "Effect of hydrogen-peroxide treatment on the physico-mechanical properties of flax fibers" in Journal of Chemists, Technologists and Environmentalists, 4, no. 1 (2023):14-19,
https://doi.org/10.59919/JCTE04202301E219 . .

TY  - JOUR
AU  - Lazić, Biljana D.
AU  - Pejić, Biljana
AU  - Kramar, Ana
AU  - Vukčević, Marija
AU  - Mihajlovski, Katarina
AU  - Rusmirović, Jelena
AU  - Kostić, Mirjana
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3973
AB  - In this work, alkali and oxidative treatments were employed to obtain flax fibers with different content of hemicelluloses and lignin, in order to study the influence of chemical composition on structure and sorption properties of flax fibers. The flax fibers were characterized using FTIR spectroscopy and FESEM microscopy, and by determination of chemical composition, carboxyl group content, electrokinetic and sorption properties. Adsorption of silver ions was used to evaluate flax fiber sorption properties, but also to obtain antimicrobial fibers whose antimicrobial activity was tested against Gram-negative bacteria Escherichia coli, Gram-positive bacteria Staphylococcus aureus and fungi Candida albicans. The progressive removal of hemicelluloses or lignin influenced the sorption properties through the increased liberation of elementary fibers and accessibility of functional surface groups of flax fibers. Removal of hemicelluloses led to increase of iodine sorption without significant change in functional groups content and electrokinetic properties. On the other hand, lignin removal led to an increase of functional groups content, namely carboxyl groups, which in turn influenced better moisture and silver ions sorption. Flax fibers with incorporated silver exhibit fair antimicrobial activity against Gram (-) E. coli, Gram (+) S. aureus and fungi C. albicans.
PB  - Springer, Dordrecht
T2  - Cellulose
T1  - Influence of hemicelluloses and lignin content on structure and sorption properties of flax fibers (Linum usitatissimum L.)
EP  - 709
IS  - 1
SP  - 697
VL  - 25
DO  - 10.1007/s10570-017-1575-4
ER  - 

@article{
author = "Lazić, Biljana D. and Pejić, Biljana and Kramar, Ana and Vukčević, Marija and Mihajlovski, Katarina and Rusmirović, Jelena and Kostić, Mirjana",
year = "2018",
abstract = "In this work, alkali and oxidative treatments were employed to obtain flax fibers with different content of hemicelluloses and lignin, in order to study the influence of chemical composition on structure and sorption properties of flax fibers. The flax fibers were characterized using FTIR spectroscopy and FESEM microscopy, and by determination of chemical composition, carboxyl group content, electrokinetic and sorption properties. Adsorption of silver ions was used to evaluate flax fiber sorption properties, but also to obtain antimicrobial fibers whose antimicrobial activity was tested against Gram-negative bacteria Escherichia coli, Gram-positive bacteria Staphylococcus aureus and fungi Candida albicans. The progressive removal of hemicelluloses or lignin influenced the sorption properties through the increased liberation of elementary fibers and accessibility of functional surface groups of flax fibers. Removal of hemicelluloses led to increase of iodine sorption without significant change in functional groups content and electrokinetic properties. On the other hand, lignin removal led to an increase of functional groups content, namely carboxyl groups, which in turn influenced better moisture and silver ions sorption. Flax fibers with incorporated silver exhibit fair antimicrobial activity against Gram (-) E. coli, Gram (+) S. aureus and fungi C. albicans.",
publisher = "Springer, Dordrecht",
journal = "Cellulose",
title = "Influence of hemicelluloses and lignin content on structure and sorption properties of flax fibers (Linum usitatissimum L.)",
pages = "709-697",
number = "1",
volume = "25",
doi = "10.1007/s10570-017-1575-4"
}

Lazić, B. D., Pejić, B., Kramar, A., Vukčević, M., Mihajlovski, K., Rusmirović, J.,& Kostić, M.. (2018). Influence of hemicelluloses and lignin content on structure and sorption properties of flax fibers (Linum usitatissimum L.). in Cellulose
Springer, Dordrecht., 25(1), 697-709.
https://doi.org/10.1007/s10570-017-1575-4

Lazić BD, Pejić B, Kramar A, Vukčević M, Mihajlovski K, Rusmirović J, Kostić M. Influence of hemicelluloses and lignin content on structure and sorption properties of flax fibers (Linum usitatissimum L.). in Cellulose. 2018;25(1):697-709.
doi:10.1007/s10570-017-1575-4 .

Lazić, Biljana D., Pejić, Biljana, Kramar, Ana, Vukčević, Marija, Mihajlovski, Katarina, Rusmirović, Jelena, Kostić, Mirjana, "Influence of hemicelluloses and lignin content on structure and sorption properties of flax fibers (Linum usitatissimum L.)" in Cellulose, 25, no. 1 (2018):697-709,
https://doi.org/10.1007/s10570-017-1575-4 . .

TY  - JOUR
AU  - Lazić, Biljana D.
AU  - Janjić, Svjetlana
AU  - Rijavec, Tatjana
AU  - Kostić, Mirjana
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3691
AB  - Flax fibers were modified with NaOH and NaClO2 under different conditions in order to not only clarify the effects of hemicelluloses and lignin removal on the morphology and properties of flax fibers, but also to improve the fiber quality. The quality of flax fibers was characterized in terms of chemical composition, fineness, whiteness, and mechanical and sorption properties. Both treatments, alkali treatment leading to hemicelluloses removal ( up to 72 %) and chlorite treatment leading to lignin removal ( up to 96 %), induce a modification of the morphology and properties of flax fibers. For 5 % NaOH treatments, as well as all NaClO2 treatments, an increase in the crystallinity was observed, while for higher NaOH concentrations, the mercerization phenomenon induced a slight decrease in the crystallinity. Modification with NaClO2 resulted in fiber fibrillation while modification with NaOH at boiling temperature resulted in smoother fiber surfaces. Both treatments cause a decrease in tensile strength and water retention values, with the maximal decrease obtained with NaOH treatment at boiling temperature. Chlorite treatment resulted in finer fibers having a higher whiteness index compare to the alkali-modified fibers.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Effect of chemical treatments on the chemical composition and properties of flax fibers
EP  - 97
IS  - 1
SP  - 83
VL  - 82
DO  - 10.2298/JSC160707106L
ER  - 

@article{
author = "Lazić, Biljana D. and Janjić, Svjetlana and Rijavec, Tatjana and Kostić, Mirjana",
year = "2017",
abstract = "Flax fibers were modified with NaOH and NaClO2 under different conditions in order to not only clarify the effects of hemicelluloses and lignin removal on the morphology and properties of flax fibers, but also to improve the fiber quality. The quality of flax fibers was characterized in terms of chemical composition, fineness, whiteness, and mechanical and sorption properties. Both treatments, alkali treatment leading to hemicelluloses removal ( up to 72 %) and chlorite treatment leading to lignin removal ( up to 96 %), induce a modification of the morphology and properties of flax fibers. For 5 % NaOH treatments, as well as all NaClO2 treatments, an increase in the crystallinity was observed, while for higher NaOH concentrations, the mercerization phenomenon induced a slight decrease in the crystallinity. Modification with NaClO2 resulted in fiber fibrillation while modification with NaOH at boiling temperature resulted in smoother fiber surfaces. Both treatments cause a decrease in tensile strength and water retention values, with the maximal decrease obtained with NaOH treatment at boiling temperature. Chlorite treatment resulted in finer fibers having a higher whiteness index compare to the alkali-modified fibers.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Effect of chemical treatments on the chemical composition and properties of flax fibers",
pages = "97-83",
number = "1",
volume = "82",
doi = "10.2298/JSC160707106L"
}

Lazić, B. D., Janjić, S., Rijavec, T.,& Kostić, M.. (2017). Effect of chemical treatments on the chemical composition and properties of flax fibers. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 82(1), 83-97.
https://doi.org/10.2298/JSC160707106L

Lazić BD, Janjić S, Rijavec T, Kostić M. Effect of chemical treatments on the chemical composition and properties of flax fibers. in Journal of the Serbian Chemical Society. 2017;82(1):83-97.
doi:10.2298/JSC160707106L .

Lazić, Biljana D., Janjić, Svjetlana, Rijavec, Tatjana, Kostić, Mirjana, "Effect of chemical treatments on the chemical composition and properties of flax fibers" in Journal of the Serbian Chemical Society, 82, no. 1 (2017):83-97,
https://doi.org/10.2298/JSC160707106L . .

TY  - JOUR
AU  - Janjić, Svjetlana
AU  - Škundrić, Petar
AU  - Kostić, Mirjana
AU  - Lazić, Biljana D.
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/802
AB  - In recent years growing attention has been paid to production of cellulose from unconventional, annually and renewable plants such as hemp and flax. Lignin and pectin are very important noncellulosic substances occurring in hemp fibers. In order to establish effects on lignin removal, four types chemical processes are conducted: with boiling sodium hydroxide, with boiling sodium hydroxide and afterwards with permanganate; with boiling sodium hydroxide and afterwards with hydrogen peroxide; and with hydrogen peroxide. Lignin in hemp before and after chemical processing is characterized. The results indicate that the alkaline boiling process is effective for removing lignin and afterwards treatment with peroxide additionally removing lignin and also increase fiber whiteness. It is establish that, the cellulose obtained from hemp fibres by previous treatment is high quality materials for the process of manufacturing cellulose fibers based on direct cellulose dissolution in the N-methylmorpholine N-oxide (NMMO) as predominating technology for the 21st century.
AB  - Poslednjih godina je posvećena velika pažnja dobijanju celuloze od nekonvencionalnih, jednogodišnjih i obnovljivih biljnih vrsta kao što su konoplja i lan. Lignin i pektin su veoma važne necelulozne primjese koje se pojavljuju u vlaknima konoplje. Da bi se utvrdila efikasnost njihovog uklanjanja iz vlakana konoplje provedene su četiri vrste hemijskih obrada ključalim rastvorom natrijum hidroksida; ključalim rastvorom natrijum hidroksida a zatim vodonik peroksidom; ključalim rastvorom natrijum hidroksida a zatim kalijumpermanganatom; i vodonik peroksidom. Određen je sadržaj lignina u vlaknima prije i poslije obrade. Rezultati pokazuju da obrada ključalim rastvorom natrijum hidroksida dosta uspješno uklanja lignin a dodatna obrada peroksidom samo poboljšava njegovo uklanjanje i bijeli vlakna. Pokazano je, da je tako dobijena celuloza visoko kvalitetan materijal, koji se može uspješno koristiti za dobijanje hemijskih celuloznih vlakana, direktnim rastvaranjem u N-metilmorfolin N-oksidu (NMMO), što će predstavljati dominantnu tehnologiju proizvodnje ovih vlakana u 21-om vijeku.
PB  - Univerzitet u Nišu - Tehnološki fakultet, Leskovac
T2  - Zbornik radova Tehnološkog fakulteta, Leskovac
T1  - Obtaining of high quality cellulose from the hemp fibers
T1  - Dobijanje visoko kvalitetne celuloze iz vlakana konoplje
EP  - 394
IS  - 14
SP  - 386
UR  - https://hdl.handle.net/21.15107/rcub_technorep_802
ER  - 

@article{
author = "Janjić, Svjetlana and Škundrić, Petar and Kostić, Mirjana and Lazić, Biljana D.",
year = "2005",
abstract = "In recent years growing attention has been paid to production of cellulose from unconventional, annually and renewable plants such as hemp and flax. Lignin and pectin are very important noncellulosic substances occurring in hemp fibers. In order to establish effects on lignin removal, four types chemical processes are conducted: with boiling sodium hydroxide, with boiling sodium hydroxide and afterwards with permanganate; with boiling sodium hydroxide and afterwards with hydrogen peroxide; and with hydrogen peroxide. Lignin in hemp before and after chemical processing is characterized. The results indicate that the alkaline boiling process is effective for removing lignin and afterwards treatment with peroxide additionally removing lignin and also increase fiber whiteness. It is establish that, the cellulose obtained from hemp fibres by previous treatment is high quality materials for the process of manufacturing cellulose fibers based on direct cellulose dissolution in the N-methylmorpholine N-oxide (NMMO) as predominating technology for the 21st century., Poslednjih godina je posvećena velika pažnja dobijanju celuloze od nekonvencionalnih, jednogodišnjih i obnovljivih biljnih vrsta kao što su konoplja i lan. Lignin i pektin su veoma važne necelulozne primjese koje se pojavljuju u vlaknima konoplje. Da bi se utvrdila efikasnost njihovog uklanjanja iz vlakana konoplje provedene su četiri vrste hemijskih obrada ključalim rastvorom natrijum hidroksida; ključalim rastvorom natrijum hidroksida a zatim vodonik peroksidom; ključalim rastvorom natrijum hidroksida a zatim kalijumpermanganatom; i vodonik peroksidom. Određen je sadržaj lignina u vlaknima prije i poslije obrade. Rezultati pokazuju da obrada ključalim rastvorom natrijum hidroksida dosta uspješno uklanja lignin a dodatna obrada peroksidom samo poboljšava njegovo uklanjanje i bijeli vlakna. Pokazano je, da je tako dobijena celuloza visoko kvalitetan materijal, koji se može uspješno koristiti za dobijanje hemijskih celuloznih vlakana, direktnim rastvaranjem u N-metilmorfolin N-oksidu (NMMO), što će predstavljati dominantnu tehnologiju proizvodnje ovih vlakana u 21-om vijeku.",
publisher = "Univerzitet u Nišu - Tehnološki fakultet, Leskovac",
journal = "Zbornik radova Tehnološkog fakulteta, Leskovac",
title = "Obtaining of high quality cellulose from the hemp fibers, Dobijanje visoko kvalitetne celuloze iz vlakana konoplje",
pages = "394-386",
number = "14",
url = "https://hdl.handle.net/21.15107/rcub_technorep_802"
}

Janjić, S., Škundrić, P., Kostić, M.,& Lazić, B. D.. (2005). Obtaining of high quality cellulose from the hemp fibers. in Zbornik radova Tehnološkog fakulteta, Leskovac
Univerzitet u Nišu - Tehnološki fakultet, Leskovac.(14), 386-394.
https://hdl.handle.net/21.15107/rcub_technorep_802

Janjić S, Škundrić P, Kostić M, Lazić BD. Obtaining of high quality cellulose from the hemp fibers. in Zbornik radova Tehnološkog fakulteta, Leskovac. 2005;(14):386-394.
https://hdl.handle.net/21.15107/rcub_technorep_802 .

Janjić, Svjetlana, Škundrić, Petar, Kostić, Mirjana, Lazić, Biljana D., "Obtaining of high quality cellulose from the hemp fibers" in Zbornik radova Tehnološkog fakulteta, Leskovac, no. 14 (2005):386-394,
https://hdl.handle.net/21.15107/rcub_technorep_802 .