The photocatalityc nanocomposite membranes with tin(IV) oxide nanoparticles were obtained by “layer-by-layer” self-assembly. Polyelectrolyte complexes with different nature were analyzed as a binder for nanocatalysts. PEI was used as a positively charged polyelectrolyte, and CMC, sodium alginate, κ- or ι-carrageenans were used as negatively charged ones. The presence of SnO2 on the membrane surface was confirmed by a scanning electron microscopy (SEM). Polyelectrolyte complexation was studied by zeta-potential measurement. The photocatalytic activity of the nanocomposite membranes was evaluated in the process of milk nanofiltration. The modification of polyethersulfone membranes with polyelectrolyte layers and SnO2 nanoparticles allowed to produce a highly concentrated retentate and membrane flux remained stable for over 8 h.
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