The representative SEM images of the PVDFNM that were obtained using different solvent systems (Fig. 1a-b: 20 wt % PVDF dissolved in DMF, Fig. 1c-d: 20 wt % PVDF dissolved in DMF/Ace cosolvent) is shown in Fig.1  Clearly, fibrous morphologies (diameter = 476�145nm) were generated from the PVDF stock solution that was prepared with the DMF/Ace cosolvent and the bead-on-string structure was observed when the solvent system was changed from DMF/Ace cosolvent to pure DMF(diameter = 234�65nm). Although the PVDFNM that was produced from the DMF-based PVDF stock solution comprised thinner fibers than that produced from the DMF/Ace-based PVDF stock solution, the DMF/Ace cosolvent system was used in the subsequent experiments because of its reproducibility and stability in production of PVDFNM. The SEM images of the EDTA/PVDFNM that was prepared by separately adding 0.06 g (Fig. 2a)and 0.3 g EDTA (Fig. 2b) in 1 mL of PVDF solution are displayed in Fig.2 Notably, the surface of the electrospun PVDF fiber was decorated with EDTA particles and the density of the EDTA decoration increased with the EDTA loading in the PVDF stock solution.This study is intended to provide a novel extraction material and procedure for the removal of soluble, sparingly soluble and insoluble heavy metal ions or particles from chemical sewage, such as that which drains away from electroplating or electropolishing plants.

Preparation and characterization of electrospun EDTA/PVDF blend nonwoven mats

248th National Meeting (2014)

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