Unusual dye adsorption behavior of kappa-carrageenan coated superparamagnetic nanoparticles
authors Salgueiro, AM; Daniel-da-Silva, AL; Girao, AV; Pinheiro, PC; Trindade, T
nationality International
journal CHEMICAL ENGINEERING JOURNAL
author keywords Magnetic nanoparticles; Polysaccharide; kappa-Carrageenan; Dye removal; Cationic dye; Methylene blue
keywords WASTE-WATER TREATMENT; METHYLENE-BLUE; AQUEOUS-SOLUTIONS; MAGNETITE NANOPARTICLES; CHITOSAN NANOPARTICLES; EFFICIENT REMOVAL; CATIONIC DYES; ACID; ADSORBENTS; ISOTHERM
abstract kappa-Carrageenan coated magnetic iron oxide nanoparticles (NPs) were synthesized and tested as adsorbents for the magnetically assisted removal of methylene blue (MB) from aqueous solutions, a cationic dye commonly present in wastes from the textile industry. The resulting composite NPs were superparamagnetic and contained ca. 12 wt% carrageenan. The MB uptake ability was found to vary with the pH solution and was larger in alkaline conditions. Both pseudo-first-order and pseudo-second-order equations predicted well the kinetics with the maximum adsorption achieved very fast, within 5 min. The MB adsorption has shown an unusual Z-type isotherm which suggests the generation of new adsorbing sites with increasing MB initial concentration. Under the experimental conditions used (23 degrees C, pH 9) the materials presented here displayed MB adsorption capacity (185.3 mg/g) higher than other magnetic sorbents previously reported. Thus x-carrageenan coated magnetic NPs are very promising eco-friendly materials for removing MB from wastewater using magnetic separation. (c) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 1385-8947
year published 2013
volume 229
beginning page 276
ending page 284
digital object identifier (doi) 10.1016/j.cej.2013.06.015
web of science category Engineering, Environmental; Engineering, Chemical
subject category Engineering
unique article identifier WOS:000324349200033
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