Kljajević, Ljiljana

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  • Kljajević, Ljiljana (2)
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Author's Bibliography

Preparation and Characterization of Geopolymers Based on Metakaolin with the Addition of Organic Phase PVA

Ivanović, Marija; Knežević, Sanja; Radović, Ivona; Kljajević, Ljiljana; Mirković, Miljana; Nenadović, Miloš; Nenadović, Snežana

(MDPI, 2023)

TY  - JOUR
AU  - Ivanović, Marija
AU  - Knežević, Sanja
AU  - Radović, Ivona
AU  - Kljajević, Ljiljana
AU  - Mirković, Miljana
AU  - Nenadović, Miloš
AU  - Nenadović, Snežana
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6311
AB  - Geopolymers have excellent physical and mechanical properties, so they can be used as a substitute for ordinary polymers. Geopolymers are ceramic materials, which exhibit the property of brittleness, which can be a limitation in some structural applications. To overcome this shortcoming, a new group of materials (organic geopolymers) was developed. The aim of this work is the synthesis of organic (hybrid) geopolymers. A geopolymer based on metakaolin was synthesized as a reference sample, while polyvinyl alcohol was added as an organic phase for synthesizing a hybrid geopolymer. It was concluded that the systems follow the rule of behavior in liquid systems. The chemical composition of the samples was determined by X-ray fluorescence analysis (XRF). Structural and phase characterization of hybrid and reference materials were analyzed using X-ray diffraction (XRD)and Fourier-transform infrared spectroscopy (FTIR), which revealed new phases in the PVA-added samples. The results show that the content of added PVA in the reaction mixture affects the phase composition of the synthesized materials. To examine the possibility of adsorption of the samples, Ultraviolet-visible spectroscopy (UV/VIS) was used. The morphology was analyzed using a scanning electron microscope with energy dispersive spectroscopy (SEM/EDS), where efflorescence was observed and identified. After characterizing the geopolymer with the addition of PVA, we obtained a material that was far more porous than the basic sample, and we can conclude that we have synthesized a material that shows good mechanical properties.
PB  - MDPI
T2  - Sustainability (Switzerland)
T1  - Preparation and Characterization of Geopolymers Based on Metakaolin with the Addition of Organic Phase PVA
IS  - 5
SP  - 4441
VL  - 15
DO  - 10.3390/su15054441
ER  - 
@article{
author = "Ivanović, Marija and Knežević, Sanja and Radović, Ivona and Kljajević, Ljiljana and Mirković, Miljana and Nenadović, Miloš and Nenadović, Snežana",
year = "2023",
abstract = "Geopolymers have excellent physical and mechanical properties, so they can be used as a substitute for ordinary polymers. Geopolymers are ceramic materials, which exhibit the property of brittleness, which can be a limitation in some structural applications. To overcome this shortcoming, a new group of materials (organic geopolymers) was developed. The aim of this work is the synthesis of organic (hybrid) geopolymers. A geopolymer based on metakaolin was synthesized as a reference sample, while polyvinyl alcohol was added as an organic phase for synthesizing a hybrid geopolymer. It was concluded that the systems follow the rule of behavior in liquid systems. The chemical composition of the samples was determined by X-ray fluorescence analysis (XRF). Structural and phase characterization of hybrid and reference materials were analyzed using X-ray diffraction (XRD)and Fourier-transform infrared spectroscopy (FTIR), which revealed new phases in the PVA-added samples. The results show that the content of added PVA in the reaction mixture affects the phase composition of the synthesized materials. To examine the possibility of adsorption of the samples, Ultraviolet-visible spectroscopy (UV/VIS) was used. The morphology was analyzed using a scanning electron microscope with energy dispersive spectroscopy (SEM/EDS), where efflorescence was observed and identified. After characterizing the geopolymer with the addition of PVA, we obtained a material that was far more porous than the basic sample, and we can conclude that we have synthesized a material that shows good mechanical properties.",
publisher = "MDPI",
journal = "Sustainability (Switzerland)",
title = "Preparation and Characterization of Geopolymers Based on Metakaolin with the Addition of Organic Phase PVA",
number = "5",
pages = "4441",
volume = "15",
doi = "10.3390/su15054441"
}
Ivanović, M., Knežević, S., Radović, I., Kljajević, L., Mirković, M., Nenadović, M.,& Nenadović, S.. (2023). Preparation and Characterization of Geopolymers Based on Metakaolin with the Addition of Organic Phase PVA. in Sustainability (Switzerland)
MDPI., 15(5), 4441.
https://doi.org/10.3390/su15054441
Ivanović M, Knežević S, Radović I, Kljajević L, Mirković M, Nenadović M, Nenadović S. Preparation and Characterization of Geopolymers Based on Metakaolin with the Addition of Organic Phase PVA. in Sustainability (Switzerland). 2023;15(5):4441.
doi:10.3390/su15054441 .
Ivanović, Marija, Knežević, Sanja, Radović, Ivona, Kljajević, Ljiljana, Mirković, Miljana, Nenadović, Miloš, Nenadović, Snežana, "Preparation and Characterization of Geopolymers Based on Metakaolin with the Addition of Organic Phase PVA" in Sustainability (Switzerland), 15, no. 5 (2023):4441,
https://doi.org/10.3390/su15054441 . .

Određivanje efikasnosti adsorbenata na bazi modifikovane dijatomejske zemlje za adsorpciju katjonske boje metilensko plavo

Maletić, Marina; Živojinović, Sara; Mladenović Nikolić, Nataša; Kljajević, Ljiljana; Nenadović, Snežana S.; Vukčević, Marija; Trivunac, Katarina

(Akademija tehničkih strukovnih studija "Beograd", 2021)

TY  - CONF
AU  - Maletić, Marina
AU  - Živojinović, Sara
AU  - Mladenović Nikolić, Nataša
AU  - Kljajević, Ljiljana
AU  - Nenadović, Snežana S.
AU  - Vukčević, Marija
AU  - Trivunac, Katarina
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6307
AB  - Metilensko plavo se često koristi u tekstilnoj, kozmetičkoj, papirnoj, kožnoj,
farmaceutskoj i prehrambenoj industriji, pri čemu kao rezultat nastaju značajne količine otpadne
vode. Prisustvo boja u vodenom ekosistemu onemogućava prolazak sunčevih zraka u dublje slojeve,
zbog čega se smanjuje fotosinteza, kvalitet vode i rastvorljivost gasova, pa dolazi do akutnog
trovanja flore i faune. Zbog toga se primenjuju različite metode za uklanjanje obojenih supstanci
pre ispuštanja u prirodne recipijente, među kojima se izdvaja adsorpcija na prirodnim
materijalima. U ovom radu ispitana je mogućnost uklanjanja katjonske boje metilensko plavo iz
vodenih rastvora adsorpcijom na modifikovanoj dijatomejskoj zemlji. Prvo je izvršena hemijska
modifikacija sa barijum-karbonatom, a zatim je dobijeni materijal termički modifikovan na
temperaturi od 900ºC pri čemu je karbonat preveden u barijum-oksid. Ovako pripremljeni
adsorbenti su korišćeni za uklanjanje metilensko plavog iz vodenog rastvora. Pokazano je da
hemijski modifikovana dijatomejska zemlja ima veći afinitet prema katjonskim bojama i da je
adsorpcija bolja u neutralnoj i baznoj sredini.
PB  - Akademija tehničkih strukovnih studija "Beograd"
C3  - Šesti naučno-stručni skup Politehnika, Zbornik radova
T1  - Određivanje efikasnosti adsorbenata na bazi modifikovane dijatomejske zemlje za adsorpciju katjonske boje metilensko plavo
EP  - 129
SP  - 124
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6307
ER  - 
@conference{
author = "Maletić, Marina and Živojinović, Sara and Mladenović Nikolić, Nataša and Kljajević, Ljiljana and Nenadović, Snežana S. and Vukčević, Marija and Trivunac, Katarina",
year = "2021",
abstract = "Metilensko plavo se često koristi u tekstilnoj, kozmetičkoj, papirnoj, kožnoj,
farmaceutskoj i prehrambenoj industriji, pri čemu kao rezultat nastaju značajne količine otpadne
vode. Prisustvo boja u vodenom ekosistemu onemogućava prolazak sunčevih zraka u dublje slojeve,
zbog čega se smanjuje fotosinteza, kvalitet vode i rastvorljivost gasova, pa dolazi do akutnog
trovanja flore i faune. Zbog toga se primenjuju različite metode za uklanjanje obojenih supstanci
pre ispuštanja u prirodne recipijente, među kojima se izdvaja adsorpcija na prirodnim
materijalima. U ovom radu ispitana je mogućnost uklanjanja katjonske boje metilensko plavo iz
vodenih rastvora adsorpcijom na modifikovanoj dijatomejskoj zemlji. Prvo je izvršena hemijska
modifikacija sa barijum-karbonatom, a zatim je dobijeni materijal termički modifikovan na
temperaturi od 900ºC pri čemu je karbonat preveden u barijum-oksid. Ovako pripremljeni
adsorbenti su korišćeni za uklanjanje metilensko plavog iz vodenog rastvora. Pokazano je da
hemijski modifikovana dijatomejska zemlja ima veći afinitet prema katjonskim bojama i da je
adsorpcija bolja u neutralnoj i baznoj sredini.",
publisher = "Akademija tehničkih strukovnih studija "Beograd"",
journal = "Šesti naučno-stručni skup Politehnika, Zbornik radova",
title = "Određivanje efikasnosti adsorbenata na bazi modifikovane dijatomejske zemlje za adsorpciju katjonske boje metilensko plavo",
pages = "129-124",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6307"
}
Maletić, M., Živojinović, S., Mladenović Nikolić, N., Kljajević, L., Nenadović, S. S., Vukčević, M.,& Trivunac, K.. (2021). Određivanje efikasnosti adsorbenata na bazi modifikovane dijatomejske zemlje za adsorpciju katjonske boje metilensko plavo. in Šesti naučno-stručni skup Politehnika, Zbornik radova
Akademija tehničkih strukovnih studija "Beograd"., 124-129.
https://hdl.handle.net/21.15107/rcub_technorep_6307
Maletić M, Živojinović S, Mladenović Nikolić N, Kljajević L, Nenadović SS, Vukčević M, Trivunac K. Određivanje efikasnosti adsorbenata na bazi modifikovane dijatomejske zemlje za adsorpciju katjonske boje metilensko plavo. in Šesti naučno-stručni skup Politehnika, Zbornik radova. 2021;:124-129.
https://hdl.handle.net/21.15107/rcub_technorep_6307 .
Maletić, Marina, Živojinović, Sara, Mladenović Nikolić, Nataša, Kljajević, Ljiljana, Nenadović, Snežana S., Vukčević, Marija, Trivunac, Katarina, "Određivanje efikasnosti adsorbenata na bazi modifikovane dijatomejske zemlje za adsorpciju katjonske boje metilensko plavo" in Šesti naučno-stručni skup Politehnika, Zbornik radova (2021):124-129,
https://hdl.handle.net/21.15107/rcub_technorep_6307 .