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Removal of aqueous pharmaceuticals by magnetically functionalized Zr-MOFs: Adsorption Kinetics, Isotherms, and regeneration.
- Source :
-
Journal of Colloid & Interface Science . Jun2022, Vol. 615, p876-886. 11p. - Publication Year :
- 2022
-
Abstract
- [Display omitted] • Fe 3 O 4 @MOF-525 was synthesized via the secondary-growth approach. • Fe 3 O 4 @MOF-525 can efficiently remove tetracycline and diclofenac sodium from water. • The introduction of Fe 3 O 4 enhanced the separability and the adsorption performance. • The generation of 1O 2 enabled the in-situ photo-regeneration of Fe 3 O 4 @MOF-525. The functionalization of metal–organic frameworks (MOFs) is imperative and challenging for the development of practical MOF-based materials. Herein, a magnetically functionalized Zr-MOF (Fe 3 O 4 @MOF-525) was synthesized via secondary-growth approach to obtain an easily-separated and recyclable adsorbent for the removal of pharmaceuticals (tetracycline (TC) and diclofenac sodium (DF)). After loading Fe 3 O 4 nanoparticles (NPs), due to the increase of micropore volume and specific surface area caused by defects, the adsorption performance of Fe 3 O 4 @MOF-525 was improved. The kinetics could be described by the pseudo-second-order kinetic model. The different adsorption capacity and initial rate were attributed to the properties of the pharmaceuticals, including the molecular size and hydrophobicity/hydrophilicity. In isotherm experiments, the maximum adsorption capacities of DF and TC on Fe 3 O 4 @MOF-525 calculated by Sips model reached 745 and 277 mg·g−1, respectively. The thermodynamic studies indicated the adsorption was endothermic and spontaneous. The effect of pH suggested that electrostatic interaction, π-π interaction, anion-π interaction, and H-bonding were possibly involved in the adsorption process. The adsorbent was separated by magnetic and regenerated. Washed with ethanol, Fe 3 O 4 @MOF-525 remained about 80% adsorption capacity after four cycles. In-situ photo-regeneration under visible-light irradiation was another attractive method, where > 95% TC was degraded in 4 h. The reaction with scavengers revealed that 1O 2 was the dominant reactive species in our system, indicating the occurrence of Type II photosensitization. The separability, excellent adsorption performance, and recyclability of Fe 3 O 4 @MOF-525 may lead to its beneficial applications in water treatment. [ABSTRACT FROM AUTHOR]
- Subjects :
- *IRON oxide nanoparticles
*IRON oxides
*ADSORPTION kinetics
*ADSORPTION capacity
Subjects
Details
- Language :
- English
- ISSN :
- 00219797
- Volume :
- 615
- Database :
- Academic Search Index
- Journal :
- Journal of Colloid & Interface Science
- Publication Type :
- Academic Journal
- Accession number :
- 155655864
- Full Text :
- https://doi.org/10.1016/j.jcis.2022.02.018