Matches in SemOpenAlex for { <https://semopenalex.org/work/W765087481> ?p ?o ?g. }
Showing items 1 to 81 of
81
with 100 items per page.
- W765087481 abstract "Acid/base and metal ion adsorption properties have been investigated for a range of chemically modified bleached Kraft fibre materials (pulps). The studies were performed via potentiometric titrations, Flame Atomic Absorbtion (and Emission) Spectroscopy, Inductively Coupled Plasma Optical Emission Spectroscopy and Extended X-ray Absorbtion Fine Structure measurements. As a result of a chemical modification procedure, the total concentration of acidic carboxylate groups in the fibre materials ranged between 43 and 590 μmol/g. The preferable surface potential model for modelling the ionic strength dependent acid/base properties of fibre materials with low charge densities, i.e. unmodified fully bleached Kraft fibre materials, was found to be the Basic Stern Model. For fibre materials with high total charge, ≳100 μmol/g, this model resulted in poor fits to data, and for such materials a number of Constant Capacitance Models, one at each ionic strength, must be recommended. With respect to metal ion adsorption, the results have indicated that the unspecific Donnan theory could correctly model the simultaneous adsorption of several metal ions, i.e. K+, Na+, Mg2+, Ca2+ and Cu2+, provided that the salt concentration in the fibre suspension is low. In suspensions of high salt concentration it was, however, found that this very same model strongly underestimated the adsorption of Ca2+ and Cu2+. Here, the Donnan model had to be complemented by specific ion exchange equilibria. These results were corroborated by spectroscopic evidence of specific interactions between Cu2+-ions and fibres. The spectroscopic indication of a complex formed between two fibre surface carboxylate groups and one Cu2+-ion, agree with the specific ion exchange model. It was therefore concluded that specific metal ionfibre interactions cannot be neglected, especially at high salt concentrations. The interactions occurring between the polycation GaO4Al12(OH)24(H2O)127+ and fibre materials were studied by both adsorption and spectroscopic measurements. These indicate that GaO4Al12(OH)24(H2O)127+ is surprisingly stable in fibre suspensions and that intact GaO4Al12(OH)24(H2O)127+- ions are strongly adsorbed onto the fibres. Also for this ion, specific interactions has to be considered, since the strong adsorption registered was too strong to be explained by Donnan equilibria. In the thesis, the stochiometric composition and an equilibrium constant characterising these interactions is presented." @default.
- W765087481 created "2016-06-24" @default.
- W765087481 creator A5019698323 @default.
- W765087481 creator A5036143020 @default.
- W765087481 creator A5051225738 @default.
- W765087481 creator A5060143310 @default.
- W765087481 date "2008-01-01" @default.
- W765087481 modified "2023-09-23" @default.
- W765087481 title "A study of the stability and adsorption behaviour of the ε-Keggin GaO4Al12(OH)24(H2O)127+ polycation in suspensions of fibre materials" @default.
- W765087481 hasPublicationYear "2008" @default.
- W765087481 type Work @default.
- W765087481 sameAs 765087481 @default.
- W765087481 citedByCount "0" @default.
- W765087481 crossrefType "journal-article" @default.
- W765087481 hasAuthorship W765087481A5019698323 @default.
- W765087481 hasAuthorship W765087481A5036143020 @default.
- W765087481 hasAuthorship W765087481A5051225738 @default.
- W765087481 hasAuthorship W765087481A5060143310 @default.
- W765087481 hasConcept C113196181 @default.
- W765087481 hasConcept C124614425 @default.
- W765087481 hasConcept C145148216 @default.
- W765087481 hasConcept C147789679 @default.
- W765087481 hasConcept C150394285 @default.
- W765087481 hasConcept C178790620 @default.
- W765087481 hasConcept C179104552 @default.
- W765087481 hasConcept C184651966 @default.
- W765087481 hasConcept C184866935 @default.
- W765087481 hasConcept C185592680 @default.
- W765087481 hasConcept C187428577 @default.
- W765087481 hasConcept C199164860 @default.
- W765087481 hasConcept C2182769 @default.
- W765087481 hasConcept C2776371256 @default.
- W765087481 hasConcept C2778074193 @default.
- W765087481 hasConcept C2780358262 @default.
- W765087481 hasConcept C43617362 @default.
- W765087481 hasConcept C544153396 @default.
- W765087481 hasConceptScore W765087481C113196181 @default.
- W765087481 hasConceptScore W765087481C124614425 @default.
- W765087481 hasConceptScore W765087481C145148216 @default.
- W765087481 hasConceptScore W765087481C147789679 @default.
- W765087481 hasConceptScore W765087481C150394285 @default.
- W765087481 hasConceptScore W765087481C178790620 @default.
- W765087481 hasConceptScore W765087481C179104552 @default.
- W765087481 hasConceptScore W765087481C184651966 @default.
- W765087481 hasConceptScore W765087481C184866935 @default.
- W765087481 hasConceptScore W765087481C185592680 @default.
- W765087481 hasConceptScore W765087481C187428577 @default.
- W765087481 hasConceptScore W765087481C199164860 @default.
- W765087481 hasConceptScore W765087481C2182769 @default.
- W765087481 hasConceptScore W765087481C2776371256 @default.
- W765087481 hasConceptScore W765087481C2778074193 @default.
- W765087481 hasConceptScore W765087481C2780358262 @default.
- W765087481 hasConceptScore W765087481C43617362 @default.
- W765087481 hasConceptScore W765087481C544153396 @default.
- W765087481 hasLocation W7650874811 @default.
- W765087481 hasOpenAccess W765087481 @default.
- W765087481 hasPrimaryLocation W7650874811 @default.
- W765087481 hasRelatedWork W1526269585 @default.
- W765087481 hasRelatedWork W1577052799 @default.
- W765087481 hasRelatedWork W1602235536 @default.
- W765087481 hasRelatedWork W1978487753 @default.
- W765087481 hasRelatedWork W1992809448 @default.
- W765087481 hasRelatedWork W1997845404 @default.
- W765087481 hasRelatedWork W2004727653 @default.
- W765087481 hasRelatedWork W2011789453 @default.
- W765087481 hasRelatedWork W2011995833 @default.
- W765087481 hasRelatedWork W2015906375 @default.
- W765087481 hasRelatedWork W2025111379 @default.
- W765087481 hasRelatedWork W2042745864 @default.
- W765087481 hasRelatedWork W2050794795 @default.
- W765087481 hasRelatedWork W2056900070 @default.
- W765087481 hasRelatedWork W2073866393 @default.
- W765087481 hasRelatedWork W2075831320 @default.
- W765087481 hasRelatedWork W2155803215 @default.
- W765087481 hasRelatedWork W2353573746 @default.
- W765087481 hasRelatedWork W2519570653 @default.
- W765087481 hasRelatedWork W2607992550 @default.
- W765087481 isParatext "false" @default.
- W765087481 isRetracted "false" @default.
- W765087481 magId "765087481" @default.
- W765087481 workType "article" @default.