PHOTOCATALYTIC PURIFICATION OF WATER

Photocatalysis plays an important role in wildlife. The process of photosynthesis, providing life on Earth, photocatalytic. From the point of view of science, the study of the nature of the photocatalytic effect, the mechanism of action of photocatalysts remains interesting. From practice it is known that TiO2 samples with crystal modification possess the greatest photocatalytic activity and cannot use a large number of possible ones. In particular, in water basins it is hydroxybenzene. Its impact on the environment leads to significant changes in the ecosystem itself. Hydroxybenzene and its various derivatives are the most common and important substances in the world. Sources of hydroxybenzene in the environment of industrial enterprises that produce pesticides and plastics, petroleum products, wood chemistry, coke, aniline, the pharmaceutical industry. The phenomenon of the appearance in time of various processes in natural conditions. The metabolism in the human body, which leads to the formation of the so-called low molecular weight and natural phenols. They are polluted by water. Photocatalytic decomposition of hydroxybenzene compounds belongs to destructive methods of sewage water purification. Application of the catalytic method in conjunction with the physical influence of UV irradiation can significantly intensify processes of oxidative destruction of organic pollutants and bring it to full mineralization in some cases. Photocatalysts should have the following properties: photoactivity, biological and chemical inertia, stability to photo corrosion, ability to use in the field of visible or near ultraviolet light, low cost and absence of toxicity. Titanium, iron, and zinc oxides and hydroxides play a role of catalysts in the process of photocatalytic decomposition of hydroxybenzene usually.