Abstract
Nanocomposite (MnFe2O4@TpPa-1, named as MFTP) adsorbent was developed by one-pot solvothermal method, using β-ketoenamine linked covalent organic frameworks (COFs, TpPa-1) as a supporting material to alleviate the aggregation of MnFe2O4. The properties were characterized by XRD, SEM, FT-IR, HRTEM, XPS, pHpzc and others. The pseudo-second-order and Langmuir model were better description the adsorption process, and the maximum UO22+ ion adsorption capacity of MFTP (1235.01 mg/g) was much larger than that of MnFe2O4 (212.1 mg/g). The adsorption mechanism was complicated, including surface adsorption, oxidation, and reduction reaction. With the aid of XPS and the first-principle calculations, conformed that transition metal ion (≡Mn(II)) species and oxygen/nitrogen-containing groups participated in adsorption process. The experimental results shown that porous MFTP nanocomposite could be used as an effective and reusable adsorbent to remove/ recover UO22+ ion from wastewater or seawater.
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