Facile Fabrication of a Continuous PVDF/ZIF‐8‐Lignosulfonate Membrane for Efficient Organic Pollutants Adsorption

Abstract Lignosulfonate (LS) enhances ZIF‐8 dispersion and active sites but faces challenges in recovery and secondary pollution due to its powdered form. To address this, a polyvinylidene fluoride (PVDF)/ZIF‐8‐LS composite membrane was fabricated via vapor deposition, where LS promoted dense ZIF‐8 growth and interfacial compatibility with PVDF. The resulting PVDF/ZIF‐8‐LS membrane shows a higher continuous, uniform and dense ZIF‐8‐LS layer without macroscopic cracks or obvious defects. In addition, the PVDF/ZIF‐8‐LS exhibits the best adsorption capacity of 110.6 mg g −1 for Congo Red, about 8.8 mg g −1 higher than the PVDF/ZIF‐8, and 110.2 mg g −1 for tetracycline, respectively. With 92% capacity retention after three cycles and stability across pH 2–10. The more active adsorption sites facilitates the contact between the ZIF‐8‐LS layer and the adsorbed substance, in addition to the electrostatic, H‐bonding, π‐π interactions, and coordination bond are also conductive to the adsorption of PVDF/ZIF‐8‐LS. The excellent adsorption performance and good recyclability of the PVDF/ZIF‐8‐LS composite membranes exhibit a potential for adsorbing other contaminants from water.