adsorption with additional titania in the gel. It is interesting to note, however, that

adsorption, similar to the destruction studies, reached a plateau at 12% loading.

Therefore, based upon the destruction studies and adsorption studies, an optimal titania

loading of 12% TiO2 was chosen.


 BET SA/vol A Pore Volume
 0.5
 70
 -0
 60 0.4
 o e
 50 *
 0.3 O
 E 40 *

 30 AAAA A 0.2a
 AA A A A A 0
 j 20 A
 m 0.1
 10 -

 0 0
 0 5 10 15 20 25 30 35 40 45
 Percent TiO2

Figure 4-10. BET surface area and pore size versus titania loading.

 35

 30-.

 0




 r
 25 -
 2 10M

 0 a
 0 -------------------------
 0 5 10 15 20 25 30 35 40 45
 Percent TiO2

Figure 4-11. Adsorption of CV (10 mg/L) versus TiO2 loading after 24 hours of mixing.