Adsorption of pharmaceuticals on chitosan-based magnetic composite particles with core-brush topology
| Autor: | Shaopeng Zhang, Jiaqing Wu, Chang Dong, Zhen Yang, Weiben Yang, Yayi Dong |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
General Chemical Engineering
Kinetics Composite number 02 engineering and technology General Chemistry 010501 environmental sciences 021001 nanoscience & nanotechnology Grafting Topology 01 natural sciences Industrial and Manufacturing Engineering Chitosan chemistry.chemical_compound Adsorption chemistry Desorption Monolayer Environmental Chemistry Surface charge 0210 nano-technology 0105 earth and related environmental sciences |
| Zdroj: | Chemical Engineering Journal. 304:325-334 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2016.06.087 |
| Popis: | A series of magnetic composite adsorbents with core-brush topology were prepared through grafting co-polymerization on the surface of chitosan/Fe3O4 composite particles (CS-MCP), and then applied for the removal of two pharmaceuticals (diclofenac sodium (DCF) and tetracycline hydrochloride) from water. Adsorption performance evaluation, including adsorption capacities from single- and binary-solute solutions at different pHs, influences of coexisting salts, desorption and reusability, demonstrated CD-MCP with polycationic brushes was a cost-effective adsorbent for DCF removal: Compared to CS-MCP, all the modified MCPs exhibited higher removal efficiencies, due to the enhanced surface areas resulting from core-brush topology; Among the modified MCPs with different surface charges, CD-MCP displayed the highest adsorption capacities, attributed to the electrostatic attraction between the positively charged brushes and the anionic contaminant’s species. Adsorption mechanism was investigated from both the macroscopic (thermodynamics and kinetics) and microscopic (changes of solution pH and spectral analyses of the adsorbent after adsorption) viewpoints: Charge attraction was the intrinsic driving force; A monolayer coverage of pharmaceuticals were adsorbed onto the brushes of CD-MCP; OH− exerted competitive adsorption effect; After adsorption, the originally extended polycationic brushes turned collapsed. The current study provided a strategy for the design of adsorbents from both topological and chemical structures. |
| Databáze: | OpenAIRE |
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