Magnetic nanosorbents with siliceous hybrid shells of alginic acid and carrageenan for removal of ciprofloxacin
authors Soares, SF; Rocha, MJ; Ferro, M; Amorim, CO; Amaral, JS; Trindade, T; Daniel-da-Silva, AL
nationality International
journal INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
author keywords Seaweed polysaccharides; Magnetite; Adsorption
keywords WASTE-WATER; AQUEOUS-SOLUTION; ADSORPTION BEHAVIOR; ACTIVATED CARBON; MESOPOROUS CARBON; OXIDE COMPOSITE; HUMIC-ACID; SORPTION; GRAPHENE; NANOPARTICLES
abstract Water contamination with antibiotics is a serious environmental threat. Ciprofloxacin (CIP) is one of the most frequently detected antibiotics in water. Herein, silica-based magnetic nanosorbents prepared using three seaweed polysaccharides, alginic acid, kappa- and lambda-carrageenan, were developed and evaluated in the uptake of ciprofloxacin. The sorbents were firstly characterized in detail to assess their morphology and composition. A systematic investigation was conducted to study the adsorption performance towards CIP, by varying the initial pH, contact time and initial CIP concentration. The maximum adsorption capacity was 464, 423 and 1350 mg/g for particles prepared from alginic acid, kappa- and lambda-carrageenan respectively. These high values indicate that these materials are among the most effective sorbents reported so far for the removal of CIP from water. The kinetic data were consistent with the pseudo-second-order model. The CIP adsorption on lambda-carrageenan particles followed a cooperative process with sigmoidal isotherm that was described by the Dubinin-Radushkevich model. The high charge density of lambda-carrageenan and the propensity of CIP molecules to self-aggregate may explain the cooperative nature of CIP adsorption. The sorbents were easily regenerated in mild conditions and could be reused in CIP removal up to 4 times without a significant loss of adsorptive properties. (C) 2019 Elsevier B.V. All rights reserved.
publisher ELSEVIER
issn 0141-8130
isbn 1879-0003
year published 2019
volume 139
beginning page 827
ending page 841
digital object identifier (doi) 10.1016/j.ijbiomac.2019.08.030
web of science category Biochemistry & Molecular Biology; Chemistry, Applied; Polymer Science
subject category Biochemistry & Molecular Biology; Chemistry; Polymer Science
unique article identifier WOS:000506421200085
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journal analysis (jcr 2019):
journal impact factor 5.162
5 year journal impact factor 5.137
category normalized journal impact factor percentile 86.689
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