In this study, caffeic acid was immobilized onto the surface of nonwoven fabrics via mussel-inspired mimicry to obtain a caffeic acid-modified nonwoven adsorbent material (PP/PCA). The adsorption properties of the modified material toward Cu (II), Pb (II), and Cd (II) were systematically investigated. The material was characterized by various techniques, including scanning electron microscopy (SEM), infrared spectroscopy, ultraviolet spectroscopy, and zeta potential analysis. The successful distribution of heavy metal ions on the surface was confirmed by comparing the content before and after adsorption. Systematic adsorption experiments were conducted to examine the effects of contact time and solution pH on the adsorption performance. Under standard conditions (298 K, pH = 6), the adsorbent showed high adsorption capacities for Cu (II), Pb (II), and Cd (II), reaching 88.6, 83.9, and 36.9 mg/g, respectively. Thermodynamics confirmed a spontaneous (ΔG° 0.99), indicating that the reaction is chemical adsorption. These results suggest that the composite material modified via mussel-inspired bionic technology possesses effective adsorption functionality for Cu (II) and Pb (II).
Li et al. (Fri,) studied this question.
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