Adsorption studies and release of selected dyes from functionalized mesoporous MCM-41 silica
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet im. Adama Mickiewicza w Poznaniu)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Central European Journal of Chemistry
ISSN
1895-1066
EISSN
1644-3624
Wydawca
VERSITA
DOI
URL
Rok publikacji
2014
Numer zeszytu
2
Strony od-do
233-241
Numer tomu
12
Identyfikator DOI
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Autorzy
(liczba autorów: 3)
Pozostali autorzy
+ 1
Słowa kluczowe
en
OPERATED MECHANIZED NANOPARTICLES
GUEST MOLECULES
DRUG-DELIVERY
SUPRAMOLECULAR NANOVALVE
SYSTEM
Streszczenia
Język
en
Treść
Functionalized mesoporous MCM-41 silica was subjected to adsorption and release studies of encapsulated guest molecules of three chosen dyes. These mesoporous systems were composed of three different capping reagents introduced by grafting method on the silica surface to control the release of dye molecules at two different pH values. The amounts of dyes adsorbed on the silica surface were measured using ultraviolet-visible (UV-VIS) spectrophotometry. The efficiency of grafting was calculated on the basis of differential thermal analysis (TG) results and elemental analysis. The release profiles were determined for all obtained systems using USP Dissolution Apparatus 2. Adsorption of the two azo dyes used was the most efficient after the positively charged functionalization and lower after functionalization with neutral and negatively charged capping reagents, while the phthalocyanine dye adsorption was almost functionalization-independent. Grafting efficiency was the highest for neutral capping reagent and much lower for electrically charged molecules of other reagents. Release studies showed clearly that desorption was pH-dependent for azo dyes and pH independent for Alcian Blue. The adsorption and release seem to be connected with the electrical charge of all constituents of these systems. Results obtained can be used for further analysis of different electrically charged molecules.
Inne
System-identifier
PX-58a58979d5de0323d9b583bb
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