Selective removal of oxytetracycline from aquaculture wastewater by molecular imprinting FeCo MOF nanosheets
Hui Li, Long Zhou, Zuliang Chen
Abstract
Aquaculture wastewater is contaminated with antibiotics such as oxytetracycline (OTC), which presents a serious threat to the environment and public health. In this study, Fe Co MOF@MIP combining 2D bimetallic metal organic framework (MOF) with molecular imprinting technique was prepared for removing typical antibiotic-OTC from mariculture wastewater. Batch experiments indicated that the maximal capacity of adsorption of Fe Co MOF@MIP to OTC was 36.9836 mg/g at 303 K, higher than that of Fe Co MOF@NIP. The large number of spatial recognition sites in the blotting layer provides specific selectivity, and adsorption mechanism might be associated with the electrostatic adsorption process, hydrogen bonding and complexation among OTC and Fe Co MOF@MIP. The adsorption process fits a quasi-secondary kinetic model with R 2 = 0.9966, suggesting that the rate of adsorption is dominated by a physical adsorption mechanism involving the sharing of electrons among the Fe Co MOF@MIP and OTC. In the presence of interference, the blotting factor of Fe Co MOF@MIP was 11.77, which demonstrated that the as-synthesized materials possess the excellent selectivity. Moreover, the synthesized nanosheets exhibited excellent reusability, with 16.61 mg/g OTC removal achieved using the Fe Co MOF@MIP after reuse on three occasions. These findings highlighted here is the promising role of Cu Co MOF nanosheets in wastewater treatment, particularly for the selective removal of antibiotics.