Environmental problems today are as relevant as ever. Scientists are searching for ways to diminish harmful industrial influence on nature. One of the ways to protect the environment, without a doubt, is the use of filters for water and air clarification of harmful substances. A comparatively common way for decaying filtered harmful chemicals is photocatalysis. One of the most frequently researched photocatalysts is titanium dioxide. Besides, titanium oxide is widely used as acid catalyst, material for membranes and for sorbents.