Repozitorij Univerze v Novi Gorici

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Naslov:Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent
Avtorji:ID Jovanovic, Mina, Innovation Center of the Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia (Avtor)
ID Arčon, Iztok, Univerza v Novi Gorici (Avtor)
ID Kovač, Janez, Institute Jozef Stefan, Jamova 39, 1000 Ljubljana, Slovenia (Avtor)
ID Novak Tušar, Nataša, Univerza v Novi Gorici (Avtor)
ID Obradovic, Bojana, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia (Avtor)
ID Rajić, Nevenka, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia (Avtor)
Datoteke: Gradivo nima datotek, ki so prostodostopne za javnost. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:In this study the uptake capacity of Mn(II) ions by zeolite A beads was investigated for different initial Mn concentration (100e400 mg Mn dm^-3) in batch mode at 25e55 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 C with apparent diffusivities in the range (1.2e2.0) x 10^-13 m2 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 C ion-exchange became the rate limiting step. The adsorption isotherms were studied at 25 C showing that the Mn adsorption is the best described by the Langmuir model suggesting a homogenous zeolite surface. XPS analysis of the Mnloaded 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 Na2EDTA 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%.
Ključne besede:Zeolite A Manganese Adsorption kinetics EXAFS/XANES XPS
Verzija publikacije:Objavljena publikacija
Leto izida:2016
Št. strani:378-385
Številčenje:226, 226
PID:20.500.12556/RUNG-2228 Novo okno
COBISS.SI-ID:4183803 Novo okno
DOI:10.1016/j.micromeso.2016.02.026 Novo okno
NUK URN:URN:SI:UNG:REP:DW6W3VOA
Datum objave v RUNG:01.04.2016
Število ogledov:5372
Število prenosov:0
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
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Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.
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Gradivo je del revije

Naslov:Microporous and Mesoporous Materials
Založnik:Elsevier
Leto izida:2016
ISSN:1387-1811

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