In this study the uptake capacity of Mn(II) ions by zeolite A beads was investigated for different initial Mn concentration (100-400 mg Mn dm(-3)) in batch mode at 25-55 degrees C. The obtained adsorption capacity varying from 30 to 50 mg Mn g(-1) demonstrated a high affinity of zeolite A towards Mn(II) present in solutions. Kinetic studies indicated the intra-particle diffusion as the rate limiting step up to 45 degrees C with apparent diffusivities in the range (1.2-2.0) x 10(-13) m(2) s(-1) and the activation energy of 21.9 kJ mol(-1), which implies strong interactions between the zeolite A and Mn ions. At 55 degrees C ion-exchange became the rate limiting step. The adsorption isotherms were studied at 25 degrees C showing that the Mn adsorption is the best described by the Langmuir model suggesting a homogenous zeolite surface. XPS analysis of the Mn-loaded beads showed that there is no surface accumulation of Mn but an almost uniform Mn distribution inside zeolite A, whereas XANES... and EXAFS suggested that the adsorption of Mn(II) was followed by the Mn(II) oxidation and oxide formation. Regeneration of the spent zeolite was examined in 8 adsorption/desorption cycles by a chelating Na(2)EDTA in a fluidized column. It has been found that zeolite A beads could be reused for at least 4 cycles with satisfactory Mn(II) adsorption efficiencies of about 70%.
TY - JOUR
AU - Jovanović, Mina
AU - Arcon, Iztok
AU - Kovač, Janez
AU - Novak-Tusar, Nataša
AU - Obradović, Bojana
AU - Rajić, Nevenka
PY - 2016
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3440
AB - In this study the uptake capacity of Mn(II) ions by zeolite A beads was investigated for different initial Mn concentration (100-400 mg Mn dm(-3)) in batch mode at 25-55 degrees C. The obtained adsorption capacity varying from 30 to 50 mg Mn g(-1) demonstrated a high affinity of zeolite A towards Mn(II) present in solutions. Kinetic studies indicated the intra-particle diffusion as the rate limiting step up to 45 degrees C with apparent diffusivities in the range (1.2-2.0) x 10(-13) m(2) s(-1) and the activation energy of 21.9 kJ mol(-1), which implies strong interactions between the zeolite A and Mn ions. At 55 degrees C ion-exchange became the rate limiting step. The adsorption isotherms were studied at 25 degrees C showing that the Mn adsorption is the best described by the Langmuir model suggesting a homogenous zeolite surface. XPS analysis of the Mn-loaded beads showed that there is no surface accumulation of Mn but an almost uniform Mn distribution inside zeolite A, whereas XANES and EXAFS suggested that the adsorption of Mn(II) was followed by the Mn(II) oxidation and oxide formation. Regeneration of the spent zeolite was examined in 8 adsorption/desorption cycles by a chelating Na(2)EDTA in a fluidized column. It has been found that zeolite A beads could be reused for at least 4 cycles with satisfactory Mn(II) adsorption efficiencies of about 70%.
PB - Elsevier Science Bv, Amsterdam
T2 - Microporous and Mesoporous Materials
T1 - Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent
EP - 385
SP - 378
VL - 226
DO - 10.1016/j.micromeso.2016.02.026
ER -
@article{
author = "Jovanović, Mina and Arcon, Iztok and Kovač, Janez and Novak-Tusar, Nataša and Obradović, Bojana and Rajić, Nevenka",
year = "2016",
abstract = "In this study the uptake capacity of Mn(II) ions by zeolite A beads was investigated for different initial Mn concentration (100-400 mg Mn dm(-3)) in batch mode at 25-55 degrees C. The obtained adsorption capacity varying from 30 to 50 mg Mn g(-1) demonstrated a high affinity of zeolite A towards Mn(II) present in solutions. Kinetic studies indicated the intra-particle diffusion as the rate limiting step up to 45 degrees C with apparent diffusivities in the range (1.2-2.0) x 10(-13) m(2) s(-1) and the activation energy of 21.9 kJ mol(-1), which implies strong interactions between the zeolite A and Mn ions. At 55 degrees C ion-exchange became the rate limiting step. The adsorption isotherms were studied at 25 degrees C showing that the Mn adsorption is the best described by the Langmuir model suggesting a homogenous zeolite surface. XPS analysis of the Mn-loaded beads showed that there is no surface accumulation of Mn but an almost uniform Mn distribution inside zeolite A, whereas XANES and EXAFS suggested that the adsorption of Mn(II) was followed by the Mn(II) oxidation and oxide formation. Regeneration of the spent zeolite was examined in 8 adsorption/desorption cycles by a chelating Na(2)EDTA in a fluidized column. It has been found that zeolite A beads could be reused for at least 4 cycles with satisfactory Mn(II) adsorption efficiencies of about 70%.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Microporous and Mesoporous Materials",
title = "Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent",
pages = "385-378",
volume = "226",
doi = "10.1016/j.micromeso.2016.02.026"
}
Jovanović, M., Arcon, I., Kovač, J., Novak-Tusar, N., Obradović, B.,& Rajić, N.. (2016). Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent. in Microporous and Mesoporous Materials
Elsevier Science Bv, Amsterdam., 226, 378-385.
https://doi.org/10.1016/j.micromeso.2016.02.026
Jovanović M, Arcon I, Kovač J, Novak-Tusar N, Obradović B, Rajić N. Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent. in Microporous and Mesoporous Materials. 2016;226:378-385.
doi:10.1016/j.micromeso.2016.02.026 .
Jovanović, Mina, Arcon, Iztok, Kovač, Janez, Novak-Tusar, Nataša, Obradović, Bojana, Rajić, Nevenka, "Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent" in Microporous and Mesoporous Materials, 226 (2016):378-385,
https://doi.org/10.1016/j.micromeso.2016.02.026 . .
