In this work multiwalled carbon nanotubes (MWCNTs) modified by oxidation (o-MWCNTs) and by aminofunctionalization (e-MWCNTs) were examined as potential adsorbents for arsenate removal from water. Adsorption characteristics of raw and modified MWCNTs were investigated in batch adsorption experiments. The influence of solution pH (pH range 3-10), contact time, and temperature (25, 35, and 45 degrees C) were studied. Ethylenediamine-functionalized MWCNTs have the greatest affinity for arsenate ions, followed by o-MWCNTs and raw-MWCNTs. The obtained experimental data for raw- and o-MWCNTs fitted Sips isotherm model, while for the e-MWCNTs, the Freundlich model provided the best fit to the experimental points. The maximum adsorption capacity for arsenate ions was achieved using e-MWCNTs, 12.18mgg(-1). The presence of the arsenate on the adsorbent is confirmed by FTIR spectroscopy. Thermodynamic studies indicated the spontaneity and endothermic nature of the adsorption. Sodium hydroxide solu...tion (0.1M) was found to desorb about 70% of arsenate from e-MWCNTs. The results with spiked drinking water samples demonstrated that e-MWCNTs, due to the present basic and acidic groups, were very efficient for the removal of arsenate ions, as well as of some cations, at pH 4.
Keywords:
adsorption / arsenate / equilibrium / kinetics
Source:
Separation Science and Technology, 2013, 48, 13, 2047-2058
TY - JOUR
AU - Veličković, Zlate
AU - Marinković, Aleksandar
AU - Bajić, Zoran J.
AU - Marković, Jelena M.
AU - Perić-Grujić, Aleksandra
AU - Uskoković, Petar
AU - Ristić, Mirjana
PY - 2013
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2386
AB - In this work multiwalled carbon nanotubes (MWCNTs) modified by oxidation (o-MWCNTs) and by aminofunctionalization (e-MWCNTs) were examined as potential adsorbents for arsenate removal from water. Adsorption characteristics of raw and modified MWCNTs were investigated in batch adsorption experiments. The influence of solution pH (pH range 3-10), contact time, and temperature (25, 35, and 45 degrees C) were studied. Ethylenediamine-functionalized MWCNTs have the greatest affinity for arsenate ions, followed by o-MWCNTs and raw-MWCNTs. The obtained experimental data for raw- and o-MWCNTs fitted Sips isotherm model, while for the e-MWCNTs, the Freundlich model provided the best fit to the experimental points. The maximum adsorption capacity for arsenate ions was achieved using e-MWCNTs, 12.18mgg(-1). The presence of the arsenate on the adsorbent is confirmed by FTIR spectroscopy. Thermodynamic studies indicated the spontaneity and endothermic nature of the adsorption. Sodium hydroxide solution (0.1M) was found to desorb about 70% of arsenate from e-MWCNTs. The results with spiked drinking water samples demonstrated that e-MWCNTs, due to the present basic and acidic groups, were very efficient for the removal of arsenate ions, as well as of some cations, at pH 4.
PB - Taylor & Francis Inc, Philadelphia
T2 - Separation Science and Technology
T1 - Oxidized and Ethylenediamine-Functionalized Multi-Walled Carbon Nanotubes for the Separation of Low Concentration Arsenate from Water
EP - 2058
IS - 13
SP - 2047
VL - 48
DO - 10.1080/01496395.2013.790446
ER -
@article{
author = "Veličković, Zlate and Marinković, Aleksandar and Bajić, Zoran J. and Marković, Jelena M. and Perić-Grujić, Aleksandra and Uskoković, Petar and Ristić, Mirjana",
year = "2013",
abstract = "In this work multiwalled carbon nanotubes (MWCNTs) modified by oxidation (o-MWCNTs) and by aminofunctionalization (e-MWCNTs) were examined as potential adsorbents for arsenate removal from water. Adsorption characteristics of raw and modified MWCNTs were investigated in batch adsorption experiments. The influence of solution pH (pH range 3-10), contact time, and temperature (25, 35, and 45 degrees C) were studied. Ethylenediamine-functionalized MWCNTs have the greatest affinity for arsenate ions, followed by o-MWCNTs and raw-MWCNTs. The obtained experimental data for raw- and o-MWCNTs fitted Sips isotherm model, while for the e-MWCNTs, the Freundlich model provided the best fit to the experimental points. The maximum adsorption capacity for arsenate ions was achieved using e-MWCNTs, 12.18mgg(-1). The presence of the arsenate on the adsorbent is confirmed by FTIR spectroscopy. Thermodynamic studies indicated the spontaneity and endothermic nature of the adsorption. Sodium hydroxide solution (0.1M) was found to desorb about 70% of arsenate from e-MWCNTs. The results with spiked drinking water samples demonstrated that e-MWCNTs, due to the present basic and acidic groups, were very efficient for the removal of arsenate ions, as well as of some cations, at pH 4.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Separation Science and Technology",
title = "Oxidized and Ethylenediamine-Functionalized Multi-Walled Carbon Nanotubes for the Separation of Low Concentration Arsenate from Water",
pages = "2058-2047",
number = "13",
volume = "48",
doi = "10.1080/01496395.2013.790446"
}
Veličković, Z., Marinković, A., Bajić, Z. J., Marković, J. M., Perić-Grujić, A., Uskoković, P.,& Ristić, M.. (2013). Oxidized and Ethylenediamine-Functionalized Multi-Walled Carbon Nanotubes for the Separation of Low Concentration Arsenate from Water. in Separation Science and Technology
Taylor & Francis Inc, Philadelphia., 48(13), 2047-2058.
https://doi.org/10.1080/01496395.2013.790446
Veličković Z, Marinković A, Bajić ZJ, Marković JM, Perić-Grujić A, Uskoković P, Ristić M. Oxidized and Ethylenediamine-Functionalized Multi-Walled Carbon Nanotubes for the Separation of Low Concentration Arsenate from Water. in Separation Science and Technology. 2013;48(13):2047-2058.
doi:10.1080/01496395.2013.790446 .
Veličković, Zlate, Marinković, Aleksandar, Bajić, Zoran J., Marković, Jelena M., Perić-Grujić, Aleksandra, Uskoković, Petar, Ristić, Mirjana, "Oxidized and Ethylenediamine-Functionalized Multi-Walled Carbon Nanotubes for the Separation of Low Concentration Arsenate from Water" in Separation Science and Technology, 48, no. 13 (2013):2047-2058,
https://doi.org/10.1080/01496395.2013.790446 . .
