Модифікування поліетерсульфонових мембран наночастинками TiO2 методом "layer-by-layer"
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Date
2017
Authors
Колесник, Ірина
Джоджик, Олег
Мукойда, В.
Коновалова, Вікторія
Царик, С.
Бурбан, Анатолій
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Abstract
Наночастинки оксиду титану(ІУ) іммобілізовано на поверхню поліетерсульфонових мембран методом "layer-by-layer" з використанням природних полісахаридів як поліаніонітів. Модифікування мембран підтверджене дослідженням залежності Z-потенціалу поверхні мембран від рН середовища. Фотокаталітичні властивості модифікованих мембран досліджено у модельній реакції розкладання родаміну Ж. Показано, що мембрани характеризуються високою здатністю самоочищення у процесі нанофільтрації бичачого сироваткового альбуміну і молока.
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 zetapotential 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 (t12=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.
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 zetapotential 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 (t12=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.
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Keywords
поліетерсульфонова мембрана, оксид титану (IV), метод "layer-by-layer", молоко, нанофільтрація, стаття, polyethersulfone membrane, titanium (IV) oxide, “layer-by-layer” method, milk concentration
Citation
Модифікування поліетерсульфонових мембран наночастинками TiO2 методом "layer-by-layer" / І. С. Колесник, О. Я. Джоджик, ... В. В. Коновалова, ... А. Ф. Бурбан [та ін.] // Хімія, фізика та технологія поверхні. - 2017. - Т. 8, № 3. - С. 310-321. - Автори: І. С. Колесник, О. Я. Джоджик, В. В. Мукойда, В. В. Коновалова, С. М. Царик, А. Ф. Бурбан.