Модифікування поліетерсульфонових мембран наночастинками TiO2 методом «layer-by-layer»

• Date: 2017
• Main Authors: Kolesnyk, I. S., Dzhodzhyk, O. Ya., Mukoida, V. V., Konovalova, V. V., Tsaryk, S. M., Burban, A. F.
• Format: Article
• Language: Ukrainian
• Published: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2017
• Subjects: поліетерсульфонова мембрана; оксид титану(IV); метод «layer-by-layer»; молоко; нанофільтрація
• Online Access: https://www.cpts.com.ua/index.php/cpts/article/view/434
• Journal Title: Chemistry, Physics and Technology of Surface

The aim of this study is to show the results of modification of polyethersulfone membranes with photocatalytic nanoparticles TiO2. Titanium(IV) oxide was used because of its non-toxicity and cheapness, moreover, its immobilization on the surface allows simultaneous separation and decomposition of pollutants. TiO2 nanoparticles were immobilized on the surface of polyethersulfone membranes by “layer-by-layer” method with natural polysaccharides as polyanions and polyethylenimine as polycation. Membrane modification was confirmed by zeta-potential dependence on pH. Membranes modified with TiO2 nanoparticles had an isoelectric point in the pH range of 5.2–5.8 which corresponds to pI of titanium oxide(IV). Photocatalytic properties of modified membranes were analyzed in a model reaction of Rhodamine G decomposition. Experimental data showed that the decomposition of Rhodamine G occurred at the reaction of a pseudo-first order. Low photocatalytic activity (dye half-life (t1/2=ln2/k) was only 17–40 hours) in the decomposition of rhodamine G is caused by a small amount of titanium oxide nanoparticles adsorbed on the surface. However, it is possible to assume that photocatalysis will continue in membranous layer, providing self-cleaning membrane. Membranes exhibited high self-cleaning ability during bovine serum albumin and milk nanofiltration. The presented results show that polyethersulfone membranes gain antifouling and self-cleaning properties after modification with polyelectrolyte complexes and titanium(IV) oxide.