Experiments of mass preparation and the results

In order to examine the operational conditions determined and to make the results more feasible for industrial application, and also to provide sample product for further application testing, experiments for mass-preparation are carried out under the optimal conditions determined above, following the procedure described in Section 15.2 and with commercial TiCl4 as the raw material, the composition of which is indicated in Table 15.5. 

The products from the multiply repeated operations were fully mixed the major part of the mixed product was calcined at 600 °C for 6 hours to yield the sample product for further application testing, while the surplus was later used for investigating the influence of the calcination temperature. 

The results on the particle sizes in the product calcined at 600°C measured by TEM are listed in Table 15.6, while those calcined at various temperatures are given in Table 15.7. The data listed in Table 15.6 show that the nano Titania product prepared by TiCl4 hydrolyzation-precipitation in the SCISR had very small sizes and a very narrow size distribution, the weighted mean size of which was calculated to be 9.64 nm. 

Average sizes of nano Titania products calcined at different temperatures 

The results for the crystalline forms of the products from the analysis of X-ray spectrum (which is not given here) indicate that the products calcined at 600 and 800°C for two hours are of the anatase and the titanic crystalline forms, respectively. 

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