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Categorytrue1Kovács, Eszter MáriaStructural curiosities of lanthanide (Ln)-modified bentonites analyzed by radioanalytical methods62622019In this work, the structure of lanthanide-bentonites was analyzed for nuclear waste treatment,
and environmental protection purpose by several analytical methods. The main mineral of
the bentonite is the montmorillonite, which has a permanent negative charge. The negative
charge is neutralized by cations attracted to the interlayer space where cation exchange takes
place and sometimes modifies the properties of the bentonite. The natural interlayer cations
may be exchanged by Lns. The importance of lanthanide ions is that they are model interactions between soil and transuranium ions, also, lanthanide cations are produced during the
fission of 235U in nuclear power plants.
Ln-exchanged bentonites were prepared from Ca-bentonite by ion exchange procedure
from Ln-perchlorate solution. To prove the successful modification Scanning Eletron Microscopy, Energy Dispersive X-ray analysis (SEM-EDX) was used showing distribution of
Ln’s and other components of bentonite. The natural bentonite and the lanthanide exchanged
bentonites were characterized by X-ray diffraction (XRD), which revealed the same mineral
composition, and the increase of the basal spacing of montmorillonite. The Ca2+, Fe3+, and
Ln’s3+ amount on the bentonite were determined by X-ray-fluorescence spectrometry (XRF).
In most Ln-bentonites, the quantity of the exchanged Ln ions was about 80-90% of the cation exchange capacity (CEC) of the bentonite. For some lanthanide bentonite (Y3+, La3+,
Ce3+, and Gd3+), however, the sorbed quantity of lanthanide ions was higher that the cation
exchange capacity. Moreover, the iron(III) content of lanthanide bentonite was less than that
of the original Ca-bentonite.
The observation is that lanthanide ions can somehow supersede iron from the octahedral
positions of crystal lattice. We assume that the departure of positively charged iron ions from
the lattice increases the negative layer charge and the cation exchange capacity. This can
motivate the enhance sorption of lanthanides.
To prove our previous statement, we examined how the pH and the concentration influences the bentonite structure without and with Lns. Ca-H, Ca-Y and Ca-La cation exchange
were carried out. The results revealed that the pH has high influence during the Ca-H cation
exchange procedure. The more acidic solution the more calcium was exchanged. In this case,
iron loss was not observed. In the case of Ca-Y, La cation exchange procedure, the pH has
low influence, meanwhile the concentration has higher influence to high amount of iron loss
during divalent- trivalent cation exchange. Thus, high amount of trivalent lanthanides cause
the structural iron release.true2019truefalsefalsefalseNONE2023-07-11false00000000000000000000000falsefalsefalsefalse2019-08-11T08:18:43.649+000037030truetrue10002English
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<div class="BookChapter Publication short-list"> <div class="authors"> <span class="author-name" mtid="10054387"> <a href="/gui2/?type=authors&mode=browse&sel=10054387" target="_blank">Kovács, Eszter Mária</a> </span> <span class="author-type"> </span> ; <span class="author-name" mtid="10007102"> <a href="/gui2/?type=authors&mode=browse&sel=10007102" target="_blank">Kónya, József</a> </span> <span class="author-type"> </span> ; <span class="author-name" mtid="10003672"> <a href="/gui2/?type=authors&mode=browse&sel=10003672" target="_blank">Nagy, Noémi</a> </span> <span class="author-type"> </span> </div ><div class="title"><a href="/gui2/?mode=browse¶ms=publication;30672805" mtid="30672805" target="_blank">Structural curiosities of lanthanide (Ln)-modified bentonites analyzed by radioanalytical methods</a></div> <div class="InBook">In: <span class="booktitle"><a href="/gui2/?mode=browse¶ms=publication;30672794" target="_blank">Book of Abstract- 2nd International Conference on Radioanalytical and Nuclear Chemsitry 2019-05-05 [Budapest, Magyarország] RANC 2019 </a></span > </div><div class="pub-info"> <span class="year">(2019)</span> <span class="page"> p. 62 </span> </div> <div class="pub-end"><div class="identifier-list"> <span class="identifiers"> </span> </div> <div class="short-pub-prop-list"> <span class="short-pub-mtid"> Közlemény:30672805 </span> <span class="status-holder"><span class="status-data status-APPROVED"> Nyilvános </span></span> <span class="pub-core">Forrás </span> <span class="pub-type">Könyvrészlet (Absztrakt / Kivonat ) </span> <!-- && !record.category.scientific --> <span class="pub-category">Tudományos</span> </div> </div> </div><div class="BookChapter Publication long-list">
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<img title="Forrásközlemény" style="float: left" src="/frontend/resources/grid/publication-core-icon.png">
<div class="autype autype0"> <span class="author-name" mtid="10054387"><a
href="/gui2/?type=authors&mode=browse&sel=10054387" target="_blank">Kovács Eszter Mária
(<span class="authorship-author-name">Kovács Eszter Mária</span>
<span class="authorAux-mtmt"> Kémia</span>)
</a>
</span>
;
<span class="author-name" mtid="10007102"><a
href="/gui2/?type=authors&mode=browse&sel=10007102" target="_blank">Kónya József
(<span class="authorship-author-name">Kónya József</span>
<span class="authorAux-mtmt"> Radiokémia</span>)
</a>
</span>
;
<span class="author-name" mtid="10003672"><a
href="/gui2/?type=authors&mode=browse&sel=10003672" target="_blank">Nagy Noémi
(<span class="authorship-author-name">M. Nagy Noémi</span>
<span class="authorAux-mtmt"> Környezettudomány</span>)
</a>
</span>
</div>
</div>
<div class="title"><a href="/gui2/?mode=browse¶ms=publication;30672805" target="_blank">Structural curiosities of lanthanide (Ln)-modified bentonites analyzed by radioanalytical methods</a></div> <div class="InBook"><div class="chapter-in">In:</div> <div class="authors">
</div>
<div class="booktitle"><a href="/gui2/?mode=browse¶ms=publication;30672794" target="_blank">Book of Abstract- 2nd International Conference on Radioanalytical and Nuclear Chemsitry 2019-05-05 [Budapest, Magyarország] RANC 2019 </a></div>
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Konferencia helye, ideje:
<span class="location">Budapest, Magyarország
<span class="conference-date">2019.05.05.
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2019.05.10.</span>
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p. 62.
</span> <span class="year">(2019)</span>
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<div class="lastModified">Utolsó módosítás: 2023.01.16. 11:39 Pécsi Éva (MTMT Közp 3, admin)
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<pre class="comment" style="margin-top: 0; margin-bottom: 0;"><u>Megjegyzés</u>: RANC2019</pre>
</div>
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