Facile preparation of novel magnetic metal-organic frameworks/Ti3C2Tx composite for efficiently removal of bisphenol A from water samples

Abstract

Bisphenol A (BPA) is widespread in the environment and has a serious impact on human body. In this study, a novel magnetic metal-organic frameworks@Ti3C2Tx composite, noted as Fe3O4@Ti3C2Tx/MOF, was prepared and used as adsorbent for the removal of BPA from environmental water. The adsorption parameters that affecting the removal efficiency of BPA, such as solution pH, contact time, adsorbent dosage, co-existing inorganic ions, ionic strength, and humic acid were investigated in detail. Accordingly, the removal efficiency of BPA by Fe3O4@Ti3C2Tx/MOF was as much as 95 %. Adsorption studies showed that the proposed composite can provide a maximum adsorption capacity of 547.43 mg g−1 for BPA within 5 min, which was superior to most of the reported adsorbents. The adsorption process was consistent with the pseudo-second-order kinetics (K2, 1.1063 μg mg−1 min−1) and Freundlich isotherm model, indicating that the adsorption was depended by chemisorption and the heterogeneous surface. Furthermore, the thermodynamic results demonstrated the exothermic nature of the adsorption process (ΔHθ = −34.84 kJ mol−1). Most importantly, the magnetic properties of the Fe3O4@Ti3C2Tx/MOF make it easy to collect, so it can be regenerated and reused for at least 4 cycles without significant loss of adsorption efficiency. Overall, the proposed composite can be applied to the efficient removal of BPA from water samples and could be potentially applicable for practical wastewater treatment.