Preparation and properties of dibenzothiophene molecularly imprinted functionalized MOF199 adsorbent

Combined with molecular imprinting technology, a novel surface molecularly imprinted polymer material MOF@SMIP was prepared, using MOF199 used as matrix, dibenzothiophene (DBT) as template molecule and methacrylic acid (MAA) as functional monomer. The structure and morphology were characterized by SEM, BET, FT-IR, etc. The adsorption behavior was evaluated using a simulated oil sample. The adsorption equilibrium time was 1.5 h. The MOF@SMIP adsorption capacity for DBT (130.73 mg/g) was higher than that for the MOF199 (37.79 mg/g), while the MOF@SMIP adsorption capacity (57.13 mg/g) was comparable to the MOF@NIP adsorption capacity. The obvious advantage is that the imprint factor f_imp is 2.29. Adsorption behavior follows the pseudo-first-order kinetic model, indicating that the adsorption is primarily a physical process. The selective adsorption experiments showed that the MOF@SMIP exhibited a higher affinity for the target molecule DBT than the structural analog benzothiophene (BT) and biphenyl. The relative selection coefficient k' of the adsorbed DBT to the interferent BT and biphenyl was 2.55 and 2.14, respectively.