http://www.cnr.it/ontology/cnr/individuo/prodotto/ID170314
Adsorption of salicylic acid on bentonite and kaolin and release experiments. (Articolo in rivista)
- Type
- Label
- Adsorption of salicylic acid on bentonite and kaolin and release experiments. (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/j.clay.2006.07.008 (literal)
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- Bonina F P; Giannossi M L; Medici L; Puglia C; Summa V; Tateo F (literal)
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- ISI Web of Science (WOS) (literal)
- Scopu (literal)
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- Dipartimento di Scienze Farmaceutiche, Facoltà di Farmacia, Università di Catania, Viale A. Doria 6, I-95100 Catania, Italy
Consiglio Nazionale delle Ricerche (CNR), Istituto di Metodologie per l'Analisi Ambientale (IMAA), I-85050 Tito Scalo (Potenza), Italy
Consiglio Nazionale delle Ricerche (CNR), Istituto di Metodologie per l'Analisi Ambientale (IMAA), I-85050 Tito Scalo (Potenza), Italy
Dipartimento di Scienze Farmaceutiche, Facoltà di Farmacia, Università di Catania, Viale A. Doria 6, I-95100 Catania, Italy
Consiglio Nazionale delle Ricerche (CNR), Istituto di Metodologie per l'Analisi Ambientale (IMAA), I-85050 Tito Scalo (Potenza), Italy
Consiglio Nazionale delle Ricerche (CNR), Istituto di Geoscienze e Georisorse (IGG)-sezione di Padova, I-35137 Padova, Italy (literal)
- Titolo
- Adsorption of salicylic acid on bentonite and kaolin and release experiments. (literal)
- Abstract
- The work deals the interactions between two commercial clays, a bentonite and a kaolin, and an iron-salicylate complex. Adsorption experiments were accomplished using a water solution containing Fe(III) 0.0176 M and salicylic acid 0.0253 M. Natural and treated clay samples were characterized by chemical analyses, powder X-ray diffraction, thermal analyses. The time dependence of salicylic acid adsorption by bentonite follows first-order kinetics, with respect to the percentage of salicylic acid adsorbed. in the first 12 h; afterwards the reaction slows down. The reaction is completely exhausted after 2 days and during the next 4 days the concentration of salicylic acid in bentonite does not change from its asymptotic value of 8.0%. The adsorption kinetics of salicylic acid by kaolin highlights a slow adsorption beginning after the fourth day of treatment, and finished after 19 days. The amount of salicylic acid adsorbed was 5.5% of the final complex. The release of salicylic acid adsorbed by bentonite and kaolin was tested in 0.2 N solutions of Na+, K+, Mg2+, and Ca2+. Salicylic acid release rates from Fe(III)-salicylate-containing bentonite were also measured through cellulose acetate membranes by means of Franz-type diffusion cells: an initial slow release of salicylic acid was followed by a fast release phase; after 23 h the concentration of salicylic acid released can be considered constant and the drug desorbed was 1.4% of the amount adsorbed by the bentonite. Even if the desorbed amount of salicylic acid is not very high, the bentonite-salicylate complex could be suitable for an application by gradual release. (literal)
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