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Wyświetlanie 1-4 z 4
Tytuł:
Effect of ph value and adsorbent concentration on the effectiveness of adsorption onto chitin and chitosan
Autorzy:
Filipkowska, Urszula
Rodziewicz, Joanna
Sobotka, Renata
Powiązania:
https://bibliotekanauki.pl/articles/1035550.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitin
chitosan
reactive dye RB5
Opis:
The study was aimed at determining the effectiveness of reactive dye RB5 removal in the adsorption process onto chitin and chitosan as affected by the quantity of an adsorbent and pH value of the solution. The experiment was conducted at two concentrations of a sorbent, i.e. 1 and 5 mg d.m./dm3 and at three values of the reaction, i.e. pH 3.0, pH 5.0, and pH 9.0. The kinetics of RB5 sorption onto chitin and chitosan was described with the use of Langmuir model. In the case of both adsorbents examined, the highest adsorption capacity was achieved at pH 3.0 and adsorbent concentration of 1 g d.m./dm3. Increasing pH value up to pH 5.0 and 9.0 and adsorbent concentration in the sample from 1 to 5 g d.m./dm3 caused a decrease in the quantity of dye absorbed.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 79-86
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of chitin and chitosan for the removal of reactive black 5 dye
Autorzy:
Szymczyk, Paula
Filipkowska, Urszula
Jóźwiak, Tomasz
Kuczajowska-Zadrożna, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/1034825.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
Reactive Black 5 (RB5)
adsorption
chitin
chitosan
Opis:
In this study, we investigated the effectiveness of Reactive Black 5 dye adsorption onto chitin and chitosan flakes. Adsorption capacity of chitin and chitosan, optimal pH of the adsorption process and reaction equilibrium time were determined. Results achieved were described with Freundlich, Langmuir and double Langmuir models. The pH value ensuring the highest dye adsorption effectiveness onto chitosan was pH 4. In turn, the highest dye adsorption effectiveness onto chitin was determined at pH 2, however considering that the pH value of industrial wastewater containing reactive dyes ranges from pH 3 to pH 4, further analyses with chitin were continued at pH 3. The time needed to reach the equilibrium concentration of dye was 360 min for chitin and 72 hours for chitosan. The study demonstrated that chitosan is the most effective sorbent of RB5. Its maximum adsorption capacity of the reactive dye accounted for 696.99 mg/g d.m., compared to 131.56 mg/g d.m. determined for chitin. Higher effectiveness of RB5 removal by chitosan is result of more number of amine groups in the chemical structure of this polymer, compared to chitin.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 260-272
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of salinity on reactive black 5 dye sorption efficiency on hydrogel chitosan sorbents
Autorzy:
Jóźwiak, Tomasz
Filipkowska, Urszula
Bolozan, Ludmila
Gache, Luminita
Powiązania:
https://bibliotekanauki.pl/articles/1034231.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
Na2SO4
NaCl
RB5 dye
chitosan
salinity
sorption
Opis:
This study examined the effect of salt concentration (NaCl/Na2SO4) on the sorption efficiency of Reactive Black 5 (RB5) dye on chitosan hydrogel granules (CHs). The tested salt concentration was in the range of 0.0 to 0.5 mol/L. The scope of the research included the effect of salinity on RB5 sorption at different pH values (4–11), equilibrium time, and maximum sorption capacity (Langmuir 2 model). At low pH (pH 4, pHpHPZC), an opposite trend was observed (the sorption efficiency of RB5 on CHs increased with increasing salinity). The concentration of salt in the solution did not have a major impact on the equilibrium time of sorption, which depended mainly on the initial pH of the solution (and ranged from 36 to 60 h). The relatively long sorption time resulted from the hydrogel structure of the sorbent used, which slowed the dye absorption ability. The maximum sorption capacity of CHs in relation to RB5 at the optimum pH (pH 4) in the solution without the addition of salt determined after 60 h of sorption was 1.386 mmol RB5/g (1373.5 mg RB5/g). Under conditions of high salinity (0.5 mol Na2SO4/L), at pH 4, the capacity was 17.2% lower (1.148 mmol RB5/g to 1139.7 mg RB5/g), and at pH 11, it was 6.3% higher (1.474 mmol RB5/g to 1460.7 mg RB5/g).
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2019, 24; 49-60
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of chitosan content in hydrogel beads on the sorption effectiveness of reactive black 5 dye
Autorzy:
Filipkowska, Urszula
Jóźwiak, Tomasz
Gache, Luminita
Bolozan, Ludmila
Powiązania:
https://bibliotekanauki.pl/articles/1034191.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan
dye
hydrogel beads
sorption
Opis:
The influence of chitosan content in hydrogel beads on the sorption effectiveness of Reactive Black 5 (RB5) dye from aqueous solutions is presented in the following work. The dry mass of chitosan in the tested hydrogel chitosan sorbents was from 2 to 10%. The influence of pH (4–11) on the sorption effectiveness of RB5 on chitosan hydrogels as well as the sorption capacity of the tested chitosan sorbents in relation to RB5 were studied. The optimal pH of RB5 sorption was determined along with the pH at the potential at zero point charge (pHPZC) of the tested sorbents. The maximum sorption capacity of the tested sorbents, depending on the amount of chitosan dry mass in the hydrogel beads, was determined. The obtained data was fit to Langmuir 1, Langmuir 2, and Freundlich models.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2019, 24; 36-48
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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