| Autor: |
Dias GC; School of Natural Sciences and Engineering, São Paulo State University (UNESP), Ilha Solteira 15385-000, SP, Brazil., Cardoso MF; School of Natural Sciences and Engineering, São Paulo State University (UNESP), Ilha Solteira 15385-000, SP, Brazil., Sanches AO; School of Natural Sciences and Engineering, São Paulo State University (UNESP), Ilha Solteira 15385-000, SP, Brazil., Santos MC; Institute of Chemistry Araraquara, São Paulo State University (UNESP), Araraquara 14800-900, SP, Brazil.; Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-900, SP, Brazil., Malmonge LF; School of Natural Sciences and Engineering, São Paulo State University (UNESP), Ilha Solteira 15385-000, SP, Brazil.; Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-900, SP, Brazil. |
| Abstrakt: |
In this study, spheres of poly (vinylidene fluoride)/clay were synthesized using an easy dripping method (also known as phase inversion). The spheres were characterized by scanning electron microscopy, X-ray diffraction, and thermal analysis. Finally, application tests were carried out using commercial cachaça, a popular alcoholic beverage in Brazil. The SEM images revealed that during the solvent exchange process for sphere formation, PVDF tends to form a three-layered structure with a low-porosity intermediate layer. However, the inclusion of clay was observed to reduce this layer and also widen the pores in the surface layer. The results of the batch adsorption tests showed that the composite with 30% clay content in relation to the mass of PVDF was the most effective among those tested, with the removal of 32.4% and 46.8% of the total copper present in the aqueous and ethanolic media, respectively. The adsorption of copper from cachaça in columns containing cut spheres resulted in adsorption indexes above 50% for samples with different copper concentrations. Such removal indices fit the samples within the current Brazilian legislation. Adsorption isotherm tests indicate that the data fit better to the BET model. |
