Desenvolvimento de Membranas de Matriz Mista baseadas em argilominerais e polímeros condutores para tratamento de água potável e de reuso
Abstract
DEVELOPMENT OF MIXED MATRIX MEMBRANES BASED ON CLAY
MINERALS AND CONDUCTIVE POLYMERS FOR THE TREATMENT OF
DRINKING WATER AND REUSE. The imbalance between the demand and
supply of drinking water for the population has placed a persistent strain on the
available water resources. Given this scenario, water treatment and the
development of innovative technologies that maximize the purification of
effluents has been a highlight of research . In this context, polymeric membranes
have been in evidence due to their versatility, efficiency and economy. However,
there is a limitation in the use of this material, which is the formation of fouling.
In order to solve this limitation, this project proposed the development of Mixed
Matrix Membranes (MMM) with conductive characteristics. Since changes in the
electrical nature of the surface of the membranes (electrostatic forces) which can
repel the fouling agents. The membranes were obtained by the phase inversion
method from the combination of polyethersulfone (PES) and the conductive
polymer (Pani). For the study of antifouling activity, the membranes were
immersed in a bovine albumin serum so lution and left for 24 hours in agitation
then they were exposed to an anionic solution for albumin desorption. The
membrane with the best antifouling activity was the one that contained 0.2% Pani,
so this was selected for the continuation of the project. The Pani concentration
was fixed, and new membranes were produced with silanized sepiolite (Sep).
Sepiolite was incorporated into the membrane PES Pani to analyze the
complementary influence of a nanoparticle on the antifouling capacity in
conjunction wit h Pani . MMM's containing 0.2% Pani and varying the Sep
concentration had an increase in hydrophilicity and in the degree of swelling,
consequently an increase in the contact angle was seen for this material.
Furthermore, the synergy of this material result ed in an increase in the
conductivity of the membranes. The membrane containing 0.2% Pani and 1% Sep
had the best antifouling result with a protein elimination of around 99.76%.
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