Abstract
Removal of metformin hydrochloride (Met•HCl) is necessary but still faces challenges. Our work reported a new adsorbent (MIL-125-NH-RSO3H, R = CH2CH2CH2), constructed via the post-synthesis covalent reaction between MIL-125-NH2 and 1,3-propanesultone. Compared with the pristine MIL-125-NH2, the newly obtained material shows improved negative surface property and enhanced hydrophobicity, ascribed to the contributions from -SO3H and the alkyl groups respectively. As a result, the adsorption capacity of MIL-125-NH-RSO3H can reach 164 mg•g−1, superior to the unmodified sample and other reported porous materials. The adsorption behavior follows the Langmuir model and pseudo-second-order model. The adsorbent possesses excellent anti-interference ability from co-existing salts and can be well regenerated through a simple elution method. Therefore, our work provides a new sight to construct high-efficiency adsorbents by simultaneously improving various host-guest interactions.
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