Magnetic quaternary chitosan hybrid nanoparticles for the efficient uptake of diclofenac from water. (1st January 2019)

• Record Type: Journal Article
• Authors: Soares, Sofia F.; Fernandes, Tiago; Sacramento, Margarida; Trindade, Tito; Daniel-da-Silva, Ana L.
• Is Part Of: Carbohydrate polymers. Volume 203(2019)
• Page Start: 35
• Page End: 44
• Publication Date: 2019-01-01
• Subjects: Quaternary chitosan -- Hybrids -- Magnetic particles -- Adsorption -- Diclofenac; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2018.09.030
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Surface modification of Fe3 O4 nanoparticles with siliceous shells enriched in quaternary chitosan. Magnetic nanoparticles containing cationic surface charge in a wide pH range. Magnetic sorbents effectively remove diclofenac from water. Easy separation of sorbents from water under a magnetic gradient. Abstract: The occurrence of pharmaceuticals in the environment and the water cycle, even at trace levels, has been a matter of great discussion in the literature in the recent years. Despite the clinical relevance of diclofenac (DCF), several studies indicate that it is one of the most frequently detected anti-inflammatory drugs in surface waters, with potential harmful impact on environment and human health. Herein, novel magnetic hybrid nanosorbents composed of magnetite cores encapsulated within a siliceous network highly enriched in a quaternary chitosan (HTCC) were successfully prepared and tested in magnetically assisted removal of sodium diclofenac from aqueous solutions. The DCF adsorption by the produced core–shell nanoparticles was assessed based on several experimental parameters. It was found that under optimal conditions, the modelling of the equilibrium data was best fit with Langmuir and Toth models where the maximum adsorption capacity of DCF was 240.4 mg/g. These results indicate that these hybrid biosorbents are among the most effective magnetic systems for the removal of this pharmaceutical from water. Through the strategy proposed in this work, novel hybrid magnetic nanoparticles containing a cationic surface charge in a broad pH range, from acidic to neutral pH values, is reported. Therefore, these materials may provide a new way of removing a wider class of other anionic contaminants from water.