Metal-chelate sorbents based on carboxyalkylchitosans: Ciprofloxacin uptake by Cu(II) and Al(III)-chelated cryogels of N-(2-carboxyethyl)chitosan.
Int J Biol Macromol
; 131: 806-811, 2019 Jun 15.
Article
em En
| MEDLINE
| ID: mdl-30904527
ABSTRACT
Here we propose a metal-chelate approach to removal of fluoroquinolones from aqueous solutions using their ability to bind strongly divalent and trivalent metal ions immobilized in a polymer matrix. Metal-affine sorbents for ciprofloxacin uptake have been fabricated via chelation of Cu(II), Al(III), and Fe(III) ions by supermacroporous cryogel of carboxyalkyl chitosan derivative (N-(2-carboxyethyl)chitosan, CEC) cross-linked with hexamethylene diisocyanate in aqeous medium. We have shown that virgin CEC cryogel adsorbed ciprofoxacin in a cationic form via electrostatic interactions at pHâ¯>â¯pICEC, but the efficacy of recovery was below 50% and strongly pH-dependent. Modification of CEC cryogel with Cu(II) and Al(III) ions improved the ciprofloxacin (CIP) recovery by up to 98% in the pH range 7-10, the sorption capacity and affinity for CIP of metal-chelate sorbents increased with metal content and reached maximum values of 280 and 390â¯mg/g for Cu(II) and Al(III)-chelated cryogels, respectively. The metal-chelated CEC cryogels were efficient for ciprofloxacin removal from solutions with environmentally relevant concentration (50⯵g/L) and were applicable as monolith sorbents under dynamic conditions.
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MEDLINE
Assunto principal:
Ciprofloxacina
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Quelantes
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Cobre
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Quitosana
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Alumínio
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Criogéis
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article