Environmental Advances (Apr 2022)
Integration of bimetallic organic frameworks and magnetic biochar for azole fungicides removal
Abstract
It is urgent to develop an excellent adsorbent with higher adsorption capacity and cost-effective to efficiently purify azole fungicides contained water, and reduce the potential negative impacts on environment. In this work, a novel magnetic composite (MBC@Fe/Mg-MIL-88B)11 MBC: Magnetic biochar, BC: Biochar, MIL: Materials of Institute Lavoisier was synthesized by integrating magnetic wheat straw biochar (MBC) and bimetallic organic framework (Fe/Mg-MIL-88B) as well as employed as a high-efficiency adsorbent for azole fungicides removal. Subsequently, the morphology and structure of as-synthesized composites were discerned by a series of characterizations. The adsorption performance of MBC@Fe/Mg-MIL-88B composites was systematically investigated and the maximum adsorption capacity towards epoxiconazole and flusilazole were 86.11 mg g−1 and 89.87 mg g−1, respectively. The adsorption process was suitable for the pseudo-second-order kinetic model and Langmuir isotherm model. The MBC@Fe/Mg-MIL-88B could adapt to a relatively wide range of pH (2-11). The thermodynamics illustrated that adsorption process was spontaneous, endothermic and feasible. The adsorption of azole fungicides onto MBC@Fe/Mg-MIL-88B was a single-layer chemical adsorption process and based on the mechanisms of electrostatic interaction, hydrogen bonding, covalent bonding and π-π stacking. This study offers a promising method for the removal of azole fungicides from environmental water samples.