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  • Title: [Efficient adsorption and removal of diclofenac sodium from water with quaternary ammonium functionalized metal-organic frameworks].
    Author: Wei Y, Wei C, Xia Y.
    Journal: Se Pu; 2018 Mar 08; 36(3):222-229. PubMed ID: 30136499.
    Abstract:
    A quaternary ammonium functionalized MIL-101(Cr) named MIL-101(Cr)-NMe3 was synthesized and explored as a novel adsorbent for the fast removal of diclofenac sodium (DCF) in water. The adsorption process of kinetics, adsorption isotherms, thermodynamics, and adsorbent regeneration were investigated. And the effects of key parameters such as pH value and ionic strength on the adsorption of DCF were also studied. The results showed that the adsorption of DCF on MIL-101(Cr)-NMe3 was very fast. Most of DCF were adsorbed in the first 30 min. The adsorption kinetics of DCF on MIL-101(Cr)-NMe3 obeyed pseudo-second-order kinetics. The adsorption isotherms of DCF on MIL-101(Cr)-NMe3 fitted well to the Langmuir adsorption model. And the maximum adsorption capacity was 310.6 mg/g at 20℃. The analysis of the adsorption mechanism showed that the electrostatic interaction and π-π stacking interaction between DCF and MIL-101(Cr)-NMe3 were responsible for the efficient adsorption. Regeneration experiments indicated that the used MIL-101(Cr)-NMe3 was recycled at least five times without significant loss of adsorption capacity. The fast adsorption kinetics, high adsorption capacity, and excellent reusability made MIL-101(Cr)-NMe3 attractive for removal DCF from aqueous solution.
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