Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 1, Pages 319-326Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b01969
Keywords
magnetic covalent organic frameworks; pharmaceutical contaminants; diclofenac sodium; solvent-free; adsorptive removal; wastewater remediation
Funding
- National Natural Science Foundation of China [21806148]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan, China) [CUG170102, CUG180610]
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Pharmaceutical contamination has drawn tremendous attention because of their adverse effects and potential risks on aquatic organisms and human health. Herein, magnetic covalent organic framework composites (MCOFs) were prepared and utilized for adsorptive removal of diclofenac sodium (DS) from water. The construction of MCOFs was achieved by integrating magnetic nanoparticks (MNPs) into a COFs' matrix via an organic terracotta process. MCOFs featuring a highly specific area and magnetically separable ability are favorable to DS removal from water. Adsorption equilibrium can be achieved within 20 min following the pseudo-second-order kinetic model (R-2 = 0.99). In addition, the experimental data achieved from adsorption isotherms demonstrated that the adsorption of DS onto MCOF-2 can be well fitted by the Freundlich adsorption model, and the maximum adsorption capacity for DS was found to be 565 mg/g. What is more important is that the high removal efficiency of DS from both actual and spiked water samples (>97.0%) was achieved by using MCOF-2 as an adsorbent. Owing to its high stability, the resultant materials exhibited excellent reusability, illustrating the great potential as sorbents for the removal of pharmaceutical contaminants.
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