6533b7defe1ef96bd1275f98

RESEARCH PRODUCT

Adsorption isotherms and thermal behavior of hybrids based on quercetin and inorganic fillers

Giuseppe CavallaroAzzurra MiliaGiuseppe LazzaraMaurizio BrunoStefana Milioto

subject

Thermogravimetric analysisLangmuirAlumina02 engineering and technology01 natural scienceschemistry.chemical_compoundsymbols.namesakeAdsorptionKaoliniteKaoliniteThermal stabilityPhysical and Theoretical ChemistryAdsorption isothermChemistryLangmuir adsorption model021001 nanoscience & nanotechnologyCondensed Matter Physics010406 physical chemistry0104 chemical sciencesThermogravimetryChemical engineeringThermogravimetrysymbolsQuercetin0210 nano-technologyQuercetinCalcium carbonate

description

We investigated the adsorption process of quercetin onto several inorganic fillers, such as kaolinite, calcium carbonate and alumina. Firstly, we performed equilibrium adsorption studies in order to determine the quercetin/filler adsorption isotherms, which were successfully fitted through the Langmuir model. Based on the adsorption data analysis, we estimated the maximum adsorption capacity of each filler as well as the Langmuir constant, which is related to the affinity between quercetin and the surfaces of the inorganic particles. Then, we prepared hybrids formed by fillers saturated with quercetin. The obtained composites were characterized by thermogravimetric analysis with the aim of determining the loading efficiency as well as the effect of the adsorption process on the quercetin thermal stability. According to the Langmuir isotherms, alumina revealed the most efficient support for quercetin adsorption. Finally, we observed that the interactions with the fillers’ surfaces induce a reduction in the quercetin degradation temperature.

yearjournalcountryeditionlanguage
2019-05-02
10.1007/s10973-019-08257-xhttp://hdl.handle.net/10447/391507