Abstract
Titanium dioxide (TiO2) coatings were prepared by chemical conversion treatment of aluminum in (NH4)2TiF6 with H2O2, to followed by sintering of the coating to immobilize the photocatalyst on aluminum. In the conversion treatment in (NH3)2TiF6 and H2O2, the F− ions in the bath reacts with the aluminum, to form AlF3 brought to the aluminum surface. Simultaneously, reduction of hydrogen ions take place over the aluminum surface, which in turn, leads to the increase in pH of the interface. The hydrolysis of the titanium peroxo fluoride was deposited on aluminum because pH increased on the surface. The coating sintered at 473 K was found to have the highest catalytic activity. The photocatalytic activity of the coating sintered at 673 K was lower than the coating heated at 473 K, which is attributed to the aggregation of TiO2. This forming process of the coating is low cost because of the useless of electrolytic decomposition process. Furthermore, practical uses are expected because immobilized substances on aluminum can easily, be to decompose at low temperatures.
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