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Photocatalytic effect with AEROSIL® fumed silica


Self-Cleaning by UV light


PHOTOCATALYTIC EFFECT

Evonik's nanoscaled titanium dioxide products are sold under the trade names AEROXIDE® and AEROPERL® and include the well-known AEROXIDE® TiO2 P25. In terms of photocatalysis, AEROXIDE® TiO2 P25 has been subject of many studies over the years, including its use in wastewater treatment, the reduction of NOx in exhaust gases, and the manufacture of anti-bacterial, self-cleaning or antifogging surfaces. Because of its high photoactivity, AEROXIDE® TiO2 P25 is often recognized as the "gold standard" in photocatalysis.



Evonik's titanium dioxides are excellent photocatalysts. This is due to the very high surface area and the mixed anatase and rutile crystal structure. Now we have enlarged our product portfolio—Evonik provides you not only with the well known AEROXIDE® TiO2 P25 but also with water based TiO2 dispersions and finer titania powder:  

AEROXIDE® and AEROPERL® for photocatalytic effects

Properties
(test methods)

Unit

AEROXIDE

TiO

P25

(powder)

VP TiO2 P90
(powder)

VP AEROPERL

P25/20

(granulated)

Specific surface area (BET)

m

/g

50 ± 15

90 ± 20

-

pH
in 4% dispersion

 

3.5 - 4.5

3.2 - 4.5

3.0 - 4.5

Average primary particle size

nm

21

approx. 14

approx. 20

Tamped density*
acc. to DIN EN ISO 787/11, Aug. 1983

g/l

approx. 130

approx. 120

approx. 700

Moisture*
2 h at 105°C

wt.%

1.5

4.0

2.5

Ignition loss
2 h at 1000°C, based on material dried for 2 h at 105°C

wt.%

2.0

3.0

2.0

TiO2 content
based on ignited material

wt.%

99.5

99.5

> 99.5

The data represents typical values (no product specification)

* ex plant

AERODISP® for photocatalytic effects

Properties
(test methods)

Unit

AERODISP

W 740 X

VP Disp. W 2730 X

pH
DIN EN ISO 787/9

 

5-7

6-8

TiO2 content
based on ignited material

wt.%

40 ± 1

30 ± 1

Mean aggregat size
d-50 value

nm

100

100

measured according DIN EN ISO 3219 at a shear rate of 100 s

mPas

1000

5000

Density
20°C

g/cm

 1.41

 1.28

The data represents typical values (no product specification)