#boron nitride
Came across an article based on a studies by chemical engineers at Rice University. A composite ofboron nitride and titanium dioxide, the same type of boron nitride often used in cosmetics, can destroy 99% of PFOA in water over a few hours when exposed to UV.
JULY 25, 2022 https://phys.org/news/2022-07-catalyst-chemicals-sunlight.html
Researchers improve catalyst that destroys 'forever chemicals' with sunlight
Rice University chemical engineers have improved their design for a light-powered catalyst that rapidly breaks down PFOA, one of the world's most problematic "forever chemical" pollutants.
Michael Wong and his students made the surprising discovery in 2020 that boron nitride, a commercially available powder that's commonly used in cosmetics, could destroy 99% of PFOA, or perfluorooctanoic acid, in water samples within just a few hours when it was exposed to ultraviolet light with a wavelength of 254 nanometers.
"That was great because PFOA is an increasingly problematic pollutant that's really hard to destroy," said Wong, corresponding author of a study about the redesigned catalyst in Chemical Engineering Journal. "But it was also less than ideal because the boron nitride was activated by short-wave UV, and the atmosphere filters out almost all of the short-wave UV from sunlight. We wanted to push as much as possible boron nitride's ability to access energy from other wavelengths of sunlight."
Long-wave UV, or UV-A, has wavelengths ranging from about 315-400 nanometers. It's what causes suntans and sunburns, and it's plentiful in sunlight that reaches Earth. Boron nitride is a semiconductor, and it isn't activated by UV-A. Titanium dioxide, a common ingredient in sunscreen, is a semiconductor that is activated by UV-A, and it had even been shown to catalyze the breakdown of PFOA, albeit very slowly, when exposed to UV-A.
So Wong and study co-lead authors Bo Wang, Lijie Duan and Kimberly Heck decided to create a composite of boron nitride and titanium dioxide that married the best features of the individual catalysts. In their new study, they showed the UV-A powered composites destroyed PFOA about 15 times faster than plain titanium dioxide photocatalysts.
- Forums
- ASX - By Stock
- 5EA
- 5EA set to skyrocket
5EA set to skyrocket, page-220
-
- There are more pages in this discussion • 1,487 more messages in this thread...
You’re viewing a single post only. To view the entire thread just sign in or Join Now (FREE)
Featured News
Add 5EA (ASX) to my watchlist
|
|||||
Last
14.5¢ |
Change
0.000(0.00%) |
Mkt cap ! $47.95M |
Open | High | Low | Value | Volume |
14.5¢ | 14.5¢ | 14.5¢ | $11.48K | 79.23K |
Buyers (Bids)
No. | Vol. | Price($) |
---|---|---|
3 | 185512 | 14.0¢ |
Sellers (Offers)
Price($) | Vol. | No. |
---|---|---|
15.0¢ | 165000 | 2 |
View Market Depth
No. | Vol. | Price($) |
---|---|---|
3 | 185512 | 0.140 |
3 | 83805 | 0.135 |
2 | 110000 | 0.130 |
1 | 19500 | 0.105 |
1 | 5800 | 0.085 |
Price($) | Vol. | No. |
---|---|---|
0.150 | 165000 | 2 |
0.160 | 21827 | 1 |
0.165 | 47000 | 1 |
0.175 | 37908 | 3 |
0.180 | 40917 | 3 |
Last trade - 13.10pm 30/07/2024 (20 minute delay) ? |
Featured News
5EA (ASX) Chart |
The Watchlist
MTL
MANTLE MINERALS LIMITED
Nick Poll, Executive Director
Nick Poll
Executive Director
SPONSORED BY The Market Online