Efficient adsorption and removal of diclofenac sodium from water with quaternary ammonium functionalized metal-organic frameworks

doi:10.3724/SP.J.1123.2017.11038

Abstract

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.

Key words: adsorption, diclofenac sodium, metal-organic frameworks (MOFs), removal

CLC Number:

O658

WEI Yu, WEI Cuixiang, XIA Yan. Efficient adsorption and removal of diclofenac sodium from water with quaternary ammonium functionalized metal-organic frameworks[J]. Chinese Journal of Chromatography, 2018, 36(3): 222-229.

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