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Dissertations / Theses on the topic 'Tonmineral'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 January 2023

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1

Eickhoff, Ina. "Wiedererkennbarkeit primärer Tonschichten in versenkungsdiagenetisch überprägten Kalk-Ton-Wechsellagerungen." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966269543.

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2

Rüping, Katherina B. "Quantifizierung von Bodentonmineralen auf der Basis einer Komplexen Mineralogischen Phasenanalyse /." Tönning [u.a.] : Der Andere Verlag, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016441524&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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3

Rügner, Oliver. "Tonmineral-Neubildung und Paläosalinität im unteren Muschelkalk des südlichen Germanischen Beckens." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961528613.

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4

Ratzenberger, Hansgeorg. "Mathematisch-statistische Zusammenhänge innerhalb der tonkeramischen Stoffsysteme." Berlin Logos-Verl, 2006. http://d-nb.info/987598651/04.

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5

Lassin, Arnault. "Thermodynamique de l'hydratation et modélisation de la stabilité des argiles : application à la pédognèse climatique et à la diagenèse hydrothermale /." Orléans : Ed. BRGM, 2000. http://www.gbv.de/dms/goettingen/336033508.pdf.

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6

Bachmaf, Samer. "Uranium sorption on clay minerals." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2010. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-62404.

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Abstract:
The objective of the work described in this thesis was to understand sorption reactions of uranium occurring at the water-clay mineral interfaces in the presence and absence of arsenic and other inorganic ligands. Uranium(VI) removal by clay minerals is influenced by a large number of factors including: type of clay mineral, pH, ionic strength, partial pressure of CO2, load of the sorbent, total amount of U present, and the presence of arsenate and other inorganic ligands such as sulfate, carbonate, and phosphate. Both sulfate and carbonate reduced uranium sorption onto IBECO bentonite due to the competition between SO42- or CO32- ions and the uranyl ion for sorption sites, or the formation of uranyl-sulfate or uranyl-carbonate complexes. Phosphate is a successful ligand to promote U(VI) removal from the aqueous solution through formation of ternary surface complexes with a surface site of bentonite. In terms of the type of clay mineral used, KGa-1b and KGa-2 kaolinites showed much greater uranium sorption than the other clay minerals (STx-1b, SWy-2, and IBECO montmorillonites) due to more aluminol sites available, which have higher affinity toward uranium than silanol sites. Sorption of uranium on montmorillonites showed a distinct dependency on sodium concentrations because of the effective competition between uranyl and sodium ions, whereas less significant differences in sorption were found for kaolinite. A multisite layer surface complexation model was able to account for U uptake on different clay minerals under a wide range of experimental conditions. The model involved eight surface reactions binding to aluminol and silanol edge sites of montmorillonite and to aluminol and titanol surface sites of kaolinite, respectively. The sorption constants were determined from the experimental data by using the parameter estimation code PEST together with PHREEQC. The PEST- PHREEQC approach indicated an extremely powerful tool compared to FITEQL. In column experiments, U(VI) was also significantly retarded due to adsorptive interaction with the porous media, requiring hundreds of pore volumes to achieve breakthrough. Concerning the U(VI) desorption, columns packed with STx-1b and SWy-2 exhibited irreversible sorption, whereas columns packed with KGa-1b and KGa-2 demonstrated slow, but complete desorption. Furthermore, most phenomena observed in batch experiments were recognized in the column experiments, too. The affinity of uranium to clay minerals was higher than that of arsenate. In systems containing uranium and arsenate, the period required to achieve the breakthrough in all columns was significantly longer when the solution was adjusted to pH 6, due to the formation of the uranyl-arsenate complex. In contrast, when pH was adjusted to 3, competitive sorption for U(VI) and As(V) accelerated the breakthrough for both elements. Finally, experiments without sorbing material conducted for higher concentrations of uranium and arsenic showed no loss of total arsenic and uranium in non-filtered samples. In contrast, significant loss was observed after filtration probably indicating the precipitation of a U/As 1:1 phase.
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7

Schubert, Dirk. "Neue Werkstoffe aus Ton, Faserstoffen und Bindemitteln durch Press- und Aufbauagglomeration." Doctoral thesis, [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=971091900.

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8

Emmerich, Katja. "Die geotechnische Bedeutung des Dehydroxylierungsverhaltens quellfähiger Tonminerale /." Zürich, 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13508.

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9

Spallek, P. [Verfasser]. "Untersuchungen ueber die Freisetzungskinetik von Blei aus Tonmineralen in Gegenwart von Nitrilotriacetat / P. Spallek." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/119662917X/34.

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10

Birkel, Ulf. "Transformation organischer Schadstoffe und abiotische Bildung von Huminstoffen in Böden durch oberflächeninduzierte Reaktionen an Tonmineralen." [S.l.] : [s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961882069.

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11

Rügner, Oliver [Verfasser]. "Tonmineral-Neubildung und Paläosalinität im unteren Muschelkalk des südlichen Germanischen Beckens / vorgelegt von Oliver Rügner." 2000. http://d-nb.info/961528613/34.

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12

Birkel, Ulf. "Transformation organischer Schadstoffe und abiotische Bildung von Huminstoffen in Böden durch oberflächeninduzierte Reaktionen an Tonmineralen." Doctoral thesis, 2001. http://hdl.handle.net/11858/00-1735-0000-0006-B360-5.

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13

Bojemüller, Enno [Verfasser]. "Porenstruktur und Adsorptionsverhalten von Tonmineralen / vorgelegt von Enno Bojemueller." 2003. http://d-nb.info/971698910/34.

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14

Witthuhn, Barbara Susanne [Verfasser]. "Steuerung der Bioverfügbarkeit von Chloraromaten durch Tensid-modifizierte Tonminerale - Sorption und biologischer Abbau / vorgelegt von Barbara Susanne Witthuhn." 2002. http://d-nb.info/964517078/34.

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15

Skrzypek, Klaudius Peter [Verfasser]. "Austauschprozesse von organischen Umweltchemikalien mit biogenen Tensiden in quellfähigen Tonmineralen / vorgelegt von Klaudius Peter Skrzypek." 2004. http://d-nb.info/970732171/34.

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16

Hartmann, Eva [Verfasser]. "Sorption von Ln(III)-An(III) und U(VI) an Tonmineralen und natürlichen Tongesteinen / von Eva Hartmann." 2010. http://d-nb.info/1007310103/34.

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17

Rickertsen, Nils [Verfasser]. "Neuartige Herbizidformulierungen auf der Basis von porösem SiO2 und Tonmineralen : Kolloidchemie im Pflanzenschutz / vorgelegt von Nils Rickertsen." 2004. http://d-nb.info/972153691/34.

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18

Birkel, Ulf [Verfasser]. "Transformation organischer Schadstoffe und abiotische Bildung von Huminstoffen in Böden durch oberflächeninduzierte Reaktionen an Tonmineralen / vorgelegt von Ulf Birkel." 2000. http://d-nb.info/961882069/34.

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19

Hofmann, Heiko [Verfasser]. "Einfluss konzentrierter Salzlösungen auf die physiko-chemischen Eigenschaften quellfähiger Tonminerale : Konsequenzen für den Einsatz von Bentonit als Versatzmaterial in einem Endlager für schwach- und mittelradioaktive Abfälle in Salzformationen / vorgelegt von Heiko Hofmann." 2003. http://d-nb.info/967776864/34.

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20

Hillebrecht, Jens. "Experimentelle Untersuchung zur Auflösungskinetik von Kaolinit und Montmorillonit in Anwesenheit von Sulfat, Phosphat, Amino- und Carbonsäuren sowie Harnstoff im offenen und geschlossenen System." Doctoral thesis, 2005. http://hdl.handle.net/11858/00-1735-0000-0006-B327-9.

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21

Klinkenberg, Martina. "Einfluss des Mikrogefüges auf ausgewählte petrophysikalische Eigenschaften von Tongesteinen und Bentoniten." Doctoral thesis, 2008. http://hdl.handle.net/11858/00-1735-0000-0006-B270-9.

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