Nanocomposites and nanomaterials

Synthesis of nanocomposite materials based on TiO2 for purification solutions 
Aleksyk A. I., Yanushevska O. I., Dontsova T. A.
National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» Prospect Peremogy, 37/4, Kyiv-03056, Ukraine. 
E-mail: aleksyk.al@gmail.com 

Ceramic-based membranes have recently been increasingly used in water purification processes, including under extreme conditions, which requires high thermal, biological and chemical stability of ceramic membranes in a wide pH range and durability, their high hydrophilicity and permeability [1]. For manufacturing the selective layers of ceramic membranes oxides of aluminum, titanium, zirconium, copper, etc. are used. TiO2 proved to be the most economical and highly effective material, which when covered with it the matrix of ceramic membrane demonstrates a high flow performance of treated water and can prevent bacterial fouling of the surface of ceramic membranes. TiO2 for ceramic membranes was obtained by hydrothermal method. For this purpose, distilled water was added to an alcoholic solution of titanium isopropoxide under constant stirring. In this way two suspensions with different titanium content (in terms of titanium isopropoxide) were obtained, namely 2.8% and 28%. After stirring the suspension was kept in hydrothermal conditions for 12 hours at 170 °C. X-ray patterns of the obtained TiO2 samples are shown in Figure, which shows that in both cases a predominantly anatase modification of titanium (IV) oxide (up to 95%) was obtained.
	Curve 2 in Figure corresponds to 2.8% isopropoxide titanium in the sample, curve 1 in Figure corresponds to 28% isopropoxide titanium in the sample. Thus, the obtained suspensions were deposited on ceramic supports by spin-coating, then examined by scanning electron microscopy. SEM images show the morphology of the deposited selective layer characteristic of ultrafiltration and microfiltration membranes.	
Figure – XRD analysis of TiO2 samples
		
1. Sergienko A. O., Dontsova T. A., Yanushevska O. I., Nagirnyak S. V., Hosseini-Bandegharaei A. Сeramic membranes: new trends and prospects (short review) // Water and water purification technologies. Scientific and technical news vol.-2020.-27.-2.-P. 4-31.