Journal
ACS APPLIED NANO MATERIALS
Volume 2, Issue 10, Pages 6492-6502Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b01429
Keywords
IRMOFs; Bi-MOFs; adsorption; removal; phosphate
Funding
- National Natural Science Foundation of China [21874073]
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Excessive phosphate can cause water eutrophication. Adsorption can remove excessive phosphate in water to alleviate eutrophication effectively. Herein, an isoreticular metal organic framework (Fe-IRMOF-3-10) with bimetallic center and double ligand was successfully synthesized from a single metal center and single ligand isoreticular metal organic framework (IRMOF-3) to remove phosphate in water effectively. In the four IRMOFs, Fe-IRMOF-3-10 shows higher adsorption capacity (177.0 mg g(-1) at 25 degrees C) and faster adsorption kinetics (5 min) for phosphate. The adsorption capacity and removal efficiency remain stable in the range of pH 4-11. The adsorption capacity of Fe-IRMOF-3-10 for phosphate is not only not affected by a large number of coexisting anions (Cl-, F-, NO3-, and SO42-) but also not affected by the ionic strength. The adsorption mechanism study illustrated that the removal of phosphate by Fe-IRMOF-3-10 not only included the affinity of amine group and Fe3+ for phosphate but also involved the ion exchange between hydroxyl group and phosphate. The adsorption efficiency of Fe-IRMOF-3-10 for phosphate from actual water samples indicated the potential of Fe-IRMOF-3-10 for the removal of phosphate from natural water samples.
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