Preparation of Polylactic Acid/ZIF-8 Composite Membrane and Analysis of Its Adsorption Performance for Ciprofloxacin
Polylactic acid(PLA)is a recyclable and renewable polyester that exhibits excellent processability in biomedical and environmental protection.ZIF-8 is widely used in the field of adsorption separation due to its high porosity and large pore volume structure.In this work,scraping coating was used to load ZIF-8 onto PLA electrospun fiber membranes,and structurally stable composite membranes were prepared by adjusting the loading amount of ZIF-8.The results showed that the surface of PLA/ZIF-8 composite film was relatively flat,and the dispersion of ZIF-8 was relatively uniform at the amount of ZIF-8 was 14％.At this point,the tensile stress of the composite film was 1.4 MPa,and the fracture elongation was 33％.The composite membrane was applied to the adsorption and separation of the broad-spectrum antibiotic ciprofloxacin(CIP),and the adsorption capacity of the composite membrane for CIP at different concentrations,temperatures,and pH levels were studied.The results showed that when the CIP concentration was 10 mg/L,the temperature was 50 ℃,and the pH value was 5.5,the adsorption capacity of the composite membrane for CIP reached 7.77 mg/g,and the adsorption equilibrium time was 0.5 h.The adsorption kinetics followed a pseudo second-order kinetic model.
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