Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites
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2019
Authors
Lazarević, SlavicaMarjanović, Vesna
Janković-Častvan, Ivona
Živković, Ljiljana
Janaćković, Đorđe
Petrović, Rada
Article (Published version)
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Natural and acid-activated sepiolites, functionalized by covalent grafting of [ 3-(2-aminoethylamino)propyl]trimethoxy-silane were used as adsorbents for the removal of an anionic Reactive Orange 16 dye from aqueous solutions. The influence of initial pH ( pH(i)) on the adsorption was first investigated in comparison with the adsorption onto unmodified sepiolites; then the dye removal process by modified samples was subjected to kinetic and equilibrium studies at pH(i) = 2.0 or 5.0, at different temperatures. Results showed that the adsorption of dye was favorable at lower pH(i) and at higher temperatures, in terms of adsorption capacity and rate of adsorption. The binding sites on the adsorbents surfaces were considered to be protonated amine groups, which play a role in the electrostatic interactions with the dye anions at pH(i) = 2.0. Formation of hydrogen bonds between hydrogen from amine groups and oxygen from the dye and van der Waals forces were proposed as the mechanisms of ads...orption at pH(i) = 5.0. The adsorption kinetics was well fitted to the pseudo-second-order kinetic model, while the equilibrium adsorption data were well correlated with the Sips isotherm. The adsorption capacity of both modified sepiolites was much higher than of the parent samples, whereas the capacity of the functionalized acid-activated sepiolite was higher (similar to 172 mg/g) than of the functionalized natural sepiolite (similar to 158 mg/g) at 298 K, pH(i) 5.0.
Keywords:
Sepiolite / Functionalization / Adsorption / Reactive Orange 16 / KineticsSource:
Desalination and Water Treatment, 2019, 163, 376-384Publisher:
- Desalination Publ, Hopkinton
Funding / projects:
- Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45019)
DOI: 10.5004/dwt.2019.24437
ISSN: 1944-3994
WoS: 000484855400036
Scopus: 2-s2.0-85073340489
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Lazarević, Slavica AU - Marjanović, Vesna AU - Janković-Častvan, Ivona AU - Živković, Ljiljana AU - Janaćković, Đorđe AU - Petrović, Rada PY - 2019 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4052 AB - Natural and acid-activated sepiolites, functionalized by covalent grafting of [ 3-(2-aminoethylamino)propyl]trimethoxy-silane were used as adsorbents for the removal of an anionic Reactive Orange 16 dye from aqueous solutions. The influence of initial pH ( pH(i)) on the adsorption was first investigated in comparison with the adsorption onto unmodified sepiolites; then the dye removal process by modified samples was subjected to kinetic and equilibrium studies at pH(i) = 2.0 or 5.0, at different temperatures. Results showed that the adsorption of dye was favorable at lower pH(i) and at higher temperatures, in terms of adsorption capacity and rate of adsorption. The binding sites on the adsorbents surfaces were considered to be protonated amine groups, which play a role in the electrostatic interactions with the dye anions at pH(i) = 2.0. Formation of hydrogen bonds between hydrogen from amine groups and oxygen from the dye and van der Waals forces were proposed as the mechanisms of adsorption at pH(i) = 5.0. The adsorption kinetics was well fitted to the pseudo-second-order kinetic model, while the equilibrium adsorption data were well correlated with the Sips isotherm. The adsorption capacity of both modified sepiolites was much higher than of the parent samples, whereas the capacity of the functionalized acid-activated sepiolite was higher (similar to 172 mg/g) than of the functionalized natural sepiolite (similar to 158 mg/g) at 298 K, pH(i) 5.0. PB - Desalination Publ, Hopkinton T2 - Desalination and Water Treatment T1 - Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites EP - 384 SP - 376 VL - 163 DO - 10.5004/dwt.2019.24437 ER -
@article{ author = "Lazarević, Slavica and Marjanović, Vesna and Janković-Častvan, Ivona and Živković, Ljiljana and Janaćković, Đorđe and Petrović, Rada", year = "2019", abstract = "Natural and acid-activated sepiolites, functionalized by covalent grafting of [ 3-(2-aminoethylamino)propyl]trimethoxy-silane were used as adsorbents for the removal of an anionic Reactive Orange 16 dye from aqueous solutions. The influence of initial pH ( pH(i)) on the adsorption was first investigated in comparison with the adsorption onto unmodified sepiolites; then the dye removal process by modified samples was subjected to kinetic and equilibrium studies at pH(i) = 2.0 or 5.0, at different temperatures. Results showed that the adsorption of dye was favorable at lower pH(i) and at higher temperatures, in terms of adsorption capacity and rate of adsorption. The binding sites on the adsorbents surfaces were considered to be protonated amine groups, which play a role in the electrostatic interactions with the dye anions at pH(i) = 2.0. Formation of hydrogen bonds between hydrogen from amine groups and oxygen from the dye and van der Waals forces were proposed as the mechanisms of adsorption at pH(i) = 5.0. The adsorption kinetics was well fitted to the pseudo-second-order kinetic model, while the equilibrium adsorption data were well correlated with the Sips isotherm. The adsorption capacity of both modified sepiolites was much higher than of the parent samples, whereas the capacity of the functionalized acid-activated sepiolite was higher (similar to 172 mg/g) than of the functionalized natural sepiolite (similar to 158 mg/g) at 298 K, pH(i) 5.0.", publisher = "Desalination Publ, Hopkinton", journal = "Desalination and Water Treatment", title = "Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites", pages = "384-376", volume = "163", doi = "10.5004/dwt.2019.24437" }
Lazarević, S., Marjanović, V., Janković-Častvan, I., Živković, L., Janaćković, Đ.,& Petrović, R.. (2019). Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites. in Desalination and Water Treatment Desalination Publ, Hopkinton., 163, 376-384. https://doi.org/10.5004/dwt.2019.24437
Lazarević S, Marjanović V, Janković-Častvan I, Živković L, Janaćković Đ, Petrović R. Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites. in Desalination and Water Treatment. 2019;163:376-384. doi:10.5004/dwt.2019.24437 .
Lazarević, Slavica, Marjanović, Vesna, Janković-Častvan, Ivona, Živković, Ljiljana, Janaćković, Đorđe, Petrović, Rada, "Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites" in Desalination and Water Treatment, 163 (2019):376-384, https://doi.org/10.5004/dwt.2019.24437 . .