article
Membranas de fibra oca de polietersulfona: efeito do líquido interno e da adição de argila
Fecha
2019-05-20Registro en:
1517-7076
10.1590/S1517-707620190001.0701
Autor
Leite, Amanda Melissa Damião
Ferreira, Rodholfo da Silva Barbosa
Oliveira, Sandriely Sonaly Lima
Araújo, Edcleide Maria
Lira, Hélio de Lucena
Medeiros, Keila Machado de
Resumen
Polymer membranes have been widely used in the treatment of effluents worldwide, solving medical, social
and environmental problems. Thus, hollow fiber membranes were produced from polyethersulfone (PES)
with adding Cloisite Na - CLNa clay and also by inserting the N, N - dimethylformamide (DMF) solvent, in
order to modify the membrane morphology. Clay was characterized by X-ray fluorescence (FRX) and X-ray
diffraction (XRD). By FRX, it was seen that the clay presented naturally sodium and with little accessory
materials. The XRD showed that Cloisite Na has a characteristic of a montmorillonite clay containing Na+.
The membranes were characterized by contact angle (flat membrane), scanning electron microscopy (SEM)
and flow measurements. By means of the contact angle measurements it was seen that the presence of clay
favored an increase the hydrophilicity of the membranes. At the hollow fiber membranes, it was observed by
SEM that the presence of clay modified the membrane morphology, changing the uniformity of the “fingers”
and the macropores and modifying the dense layer in the center of the porous support. The addition of the
acid in the internal liquid modified even more the morphology, decreasing the dense layer at the center of the
membrane porous support and also changing the “fingers” and the macropores, having a greater uniformity of the same with respect to the membrane without the presence of DMF in the internal liquid. From the flow
measurements it was possible to observe that the membrane containing 5% CLNa with the presence of the
solvent in the internal liquid obtained a greater flow over time, this occurred due to the presented more
uniform morphology of the membrane