**2. Synthetic methods**

The recent development of nanotechnology has proved that nanomaterials such as nano-sized titanium dioxide photocatalysts can have high activity in the photodegradation of a wide range of organic and inorganic contaminants in water. It is believed that photocatalysis will soon be recognized as one of the most effective means of dealing with various kinds of wastewater since organic pollutants can be completely degraded to harmless matter under normal

It is capable of degrading pollutants such as herbicides, carboxylic acids and alcohols completely to carbon dioxide, water and simple minerals [4]. For it to be very effective, it should have certain properties such as suitable particle size, shape, crystallinity and a good ratio of anatase to rutile. This is the reason why most researchers have been trying to use different methods to get particles with suitable characteristics for environmental remediation or for

lar, titanium dioxide nanotubes (TNTs) have their performance improved in photovoltaics [5]

nanostructures, in particu-

other applications of interest. Several studies have proved that TiO2

conditions of temperature and pressure.

**Figure 1.** Different forms titanium dioxide [1].

152 Titanium Dioxide - Material for a Sustainable Environment
