Abstract
Ribbon-like porous cellulose acetate (CA) ultrafine fibers with diameter of 0.94 ± 0.36 μm and pore size of 52 × 98 nm were prepared by electrospinning. The adsorption properties of Cu2+ on porous CA ultrafine fibers were studied. The maximum removal efficiencies of Cu2+ on CA membrane (MCA), CA ultrafine fibers (FCA), and porous CA ultrafine fibers (PFCA) were 19.1, 70.8, and 88.6%, respectively. This was attributed to the formation of nanoporous structure on the fibers surfaces, which increased the special surface area from 4.33 to 56.57 m2/g. The adsorption data followed the Langmuir and Freundlich models. But the Langmuir model had better correlation at different temperatures. Based on the thermodynamic parameters, including ΔG°, ΔH°, and ΔS° calculated, the negative values of ΔG° indicated that the adsorption of Cu2+ on PFCA was spontaneous and thermodynamically favorable. The positive values of ΔH° demonstrate that the adsorption process belonged to endothermic nature, and revealed that high temperature is more beneficial for adsorption than low temperature. The positive value of ΔS° indicated that the randomness at the solid/solution interface with some structural changes in both the adsorbates and adsorbents during the adsorption process increased.
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