Air Quality with KOC-86

KOC-86 Air Purification Cababilities

The ability of photocatalytic TiO2 to break down NOx and SOx in the atmosphere was tested. A sample with TiO2 was placed into a sealed 0.25-m3 chamber that was then filled with a known amount of NO2. The sample was exposed to UV light and the NO2 content was measured at various time intervals. The test was then run again replacing the NO2 with SO2. Results of the test are summarized in the tables below.

 

Table 1. Removal of NO2 by Photocatalytic TiO2

Time (Min) NO2 Content (ppm) Percent Removed
0
5.6
0.0%
15
2.8
50%
30
2.5
55.4%
45
1.0
82.1%
60
0.8
85.7%

Table 1. Removal of SO2 by Photocatalytic TiO2

Time (Min) SO2 Content (ppm) Percent Removed
0
5.4
0.0%
15
1.8
66.7%
30
0.6
88.9%
45
0.2
96.3%
60
0.2
96.3%

The data shows that after one hour of exposure to activated TiO2 in a sealed environment, 85.7% of the NO2 and 96.3% of the SO2 was removed.

Testing was done by two additional thrid-party labs to determine the molar amount of NOx removed from a moving stream. The average test conditions and results are summarized in the table below.

Data obtained from test results from SGA Taiwan LTG. Original report available upon request. Data obtained from tests performed by Kon Corporation. Original report available upon request.

 

Table 3. Test Conditions & Results for NOx Removal from Air Stream

Coated Sample Size (cm2)
50.0
Temperature (Celcius)
25
% Relative Humidity
50
UV Exposure (W/m2)
10
No Stream Concentration
5.0
Exposure Time
5.0
Flow Rate (L/min)
3.0
Net No
2.31

From this data, it can be estimated that 1 m2 of substrate coated with the photocatalytic Ti)2 can break down ~0.924 mmol of NO2 per day (assuming 10 hours of sunlight exposure per day). By comparison, one tree is able to break down on average 18.39 mmol per day. This means that roughly 20 m2 of  TiO2 coated substrate has the air cleaning power of one tree. Further, this means that application to the outer wall of one 5-story building (~100 m2) is the equivalent of planting 5 trees and application to the outer wall of one 20-story building (~2,000 m2) is the equivalent of planting 100 trees. The air purification power is even greater in urban areas where NOx concentration is very high and the number of trees planted is low.

NASA Studies TiO2 & its Effect on Air Quality

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