How To Turn Nitrates Into Water And Air

Engineers at Rice University’s Nanotechnology Enabled Water Treatment (NEWT) Center have found a catalyst that cleans toxic nitrates from drinking water by converting them into air and water.

Nitrates come mainly from agricultural runoff, which affects farming communities all over the world,” said Rice chemical engineer Michael Wong, the lead scientist on the study. “Nitrates are both an environmental problem and health problem because they’re toxic. There are ion-exchange filters that can remove them from water, but these need to be flushed every few months to reuse them, and when that happens, the flushed water just returns a concentrated dose of nitrates right back into the water supply.”

Wong’s lab specializes in developing nanoparticle-based catalysts, submicroscopic bits of metal that speed up chemical reactions. In 2013, his group showed that tiny gold spheres dotted with specks of palladium could break apart nitrites, the more toxic chemical cousins of nitrates.

Nitrates are molecules that have one nitrogen atom and three oxygen atoms,” Wong explained. “Nitrates turn into nitrites if they lose an oxygen, but nitrites are even more toxic than nitrates, so you don’t want to stop with nitrites. Moreover, nitrates are the more prevalent problem. Ultimately, the best way to remove nitrates is a catalytic process that breaks them completely apart into nitrogen and oxygen, or in our case, nitrogen and water because we add a little hydrogen, he said”. “More than 75 percent of Earth’s atmosphere is gaseous nitrogen, so we’re really turning nitrates into air and water.

Nitrates are toxic to infants and pregnant women and may also be carcinogenic. Nitrate pollution is common in agricultural communities, especially in the U.S. Corn Belt and California’s Central Valley, where fertilizers are heavily used, and some studies have shown that nitrate pollution is on the rise due to changing land-use patterns.

Both nitrates and nitrites are regulated by theEnvironmental Protection Agency, which sets allowable limits for safe drinking water. In communities with polluted wells and lakes, that typically means pretreating drinking water with ion-exchange resins that trap and remove nitrates and nitrites without destroying them.

The research is available online in the American Chemical Society journal ACS Catalysis.

Source: http://news.rice.edu/

Run A Car With Water And Air

The German automaker Audi announced it has created the first batch of liquid “e-diesel” at a research facility in Dresden. The clear fuel is produced through a “power to liquid” process, masterminded by the German clean tech company and Audi partner Sunfire.

The process uses carbon dioxide, the most common greenhouse gas, which can be captured directly from air. Carbon dioxide is created largely by burning fossil fuels and contributes to global warming. Now Sunfire said it can recycle the gas to make a more efficient, carbon-neutral fuel.
Unlike conventional fossil fuels, the “e-diesel” doesn’t contain sulphur and other contaminants.
audi e-diesel
The engine runs quieter and fewer pollutants are being created,” Sunfire‘s Christian von Olshausen said.
The fuel is produced in three steps. First, the researchers heat up steam to very high temperatures to break it down into hydrogen and oxygen. This process requires temperatures of over 800 degrees Celsius (1,472 Fahrenheit) and is powered by green energy such as solar or wind power.
Second, they mix the hydrogen with carbon dioxide under pressure and at high temperature to create so-called blue crude. Lastly, the blue crude is refined into fuels in a similar way fossil crude oil is refined into gasoline.
Audi (AUDVF) said its lab tests have shown the “e-diesel” can be mixed with fossil fuels or used as a fuel on its own.
At this stage the e-diesel cost 40 % more than the regular gasoline per liter to produce.
Source: http://www.sunfire.de/
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http://money.cnn.com/