Abstract
A cationic porous framework with mobile anions (MIL-101(Cr)-Cl) was easily and successfully synthesized by utilizing the stronger affinity of F− to Al3+ than Cr3+ in the charge-balanced framework of MIL-101(Cr). The structure, morphology and porosity of MIL-101(Cr)-Cl were characterized. The obtained new materials retain the high surface area, good thermostability, and structure topology of MIL-101(Cr). With the mobile Cl− anion, MIL-101(Cr)-Cl can be used as an ion-exchange material for anionic organic pollutions. In this work, 2,4-dichlorophenoxyacetic acid (2,4-D) was used as a model to test the absorption performance of this new material. This new material exhibited improved adsorbability compared to that of the original metal-organic frameworks (MOFs). At the same time, this material also shows high anti-interference performance with changing solution pH.
Highlights
Water pollution has become a global problem and is receiving significant attention, especially in developing countries
We successfully synthesized MIL-101(Cr) and MIL-101(Cr)-Cl by a simple hot AlCl3 solution treatment step. Both of them were used as adsorbents for removing 2,4-D
While studying the adsorption mechanism, we found that in addition to electrostatic interaction and π–π stacking, ion exchange might play a large part in the adsorption process
Summary
Water pollution has become a global problem and is receiving significant attention, especially in developing countries. Various technologies have been used to remove pollutants, including photo-reduction or degradation [1], bio-degradation [2], ion exchange [3] and adsorption [4]. The existing organic materials that can be used in ion exchange are sol–gel adsorbents [5] and polymer resins or membranes [6], which show rapid exchange kinetics and high ion-exchange capacity, but their low thermal and chemical stability limit their application in water purification. Inorganic ion exchangers such as zeolites [7] and layered double hydroxides [8] have high thermal and chemical stability, their exchange kinetics and ion-exchange capacity are low. Developing new materials with high ion-exchange capacity and thermal and chemical stability is still a challenging task
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