Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Modification of kaolinite by Grafting of siderophilic ligands to the external octahedral surface

Title data

Diar-Bakerly, Bashar ; Hirsemann, Dunja ; Kalo, Hussein ; Schobert, Rainer ; Breu, Josef:
Modification of kaolinite by Grafting of siderophilic ligands to the external octahedral surface.
In: Applied Clay Science. Vol. 90 (March 2014) . - pp. 67-72.
ISSN 0169-1317
DOI: https://doi.org/10.1016/j.clay.2013.12.020

Abstract in another language

The modification of the external octahedral surface of kaolinite (Kaol) was investigated using two siderophilic ligands (SL): 3,4-dihydroxybenzophenone (DBP) and quercetin (Qu). These SL have a 1,2-dihydroxyphenyl group that forms chelate-complexes with aluminum cations. Adsorption isotherms were obtained colorimetrically. PXRD patterns proved that the adsorption was attributed only to the external surfaces. Furthermore, adsorption of fluoride ions was applied to quantify the non-μ-hydroxy groups of the edges and derive the surface area of edges.

Comparing maximum adsorption capacities with surface area of edges, it can be safely concluded that SL are indeed capable to coordinate to the aluminol basal surface of Kaol. This conclusion is corroborated by significant bathochromic shifts upon adsorption of the ligands that indicate the formation of a surface complex with exposed Al3 +. Thus even small amounts of adsorbed SL changed the surface tension of Kaol significantly. Consequently, forced sedimentation experiments showed that the modified Kaol is rendered hydrophobic enough to form stable dispersions in organic solvents fostering preparation of clay polymer nanocomposites (CPN).

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Kaolinite; Catechol; Surface modification; Fluoride adsorption; Surface-complex
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Organic Chemistry I > Chair Organic Chemistry I - Univ.-Prof. Dr. Rainer Schobert
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP A 6
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Organic Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 20 Mar 2018 10:31
Last Modified: 20 Mar 2018 10:31
URI: https://eref.uni-bayreuth.de/id/eprint/9277