In situ construction of MOF-808@β-cyclodextrin composite nanofibers for simultaneous 2,4-Dichlorophenoxyacetic acid removal and antibacterial applications

The widespread use of 2,4-Dichlorophenoxyacetic acid (2,4-D) as an herbicide has led to its persistent accumulation in water bodies, posing significant environmental challenges. Conventional adsorbents often suffer from reduced efficiency due to bacterial fouling. Therefore, designing multifunctional adsorbents that combine high herbicide adsorption capacity with robust antimicrobial properties is crucial. Herein, a novel, efficient and antibacterial MOF-808@β-cyclodextrin composite nanofiber membrane (MOF-808@CP) is synthesized for 2,4-D removal. The integration of MOF-808 and β-cyclodextrin based nanofibers increases the adsorption sites, synergistically enhancing the adsorption ability. MOF-808@CP demonstrates a high adsorption capacity for 2,4-D, reaching 169.82 mg/g, along with strong antibacterial activity against Escherichia coli (98.42 %) and Staphylococcus aureus (96.73 %). The membrane also exhibits excellent regeneration capability and strong resistance to interference from co-existing substances. Furthermore, the membrane demonstrates excellent recyclability and effectively treats real 2,4-D contaminated water, reducing the chemical oxygen demand concentration of 2,4-D significantly to satisfy the pesticide sewage discharge standard. This study provides a viable strategy for developing multifunctional adsorption membranes for practical pesticide wastewater treatment.