Environmentally friendly, soy air filter
Hazardous gases escape most filters
Poor air quality causes health problems worldwide and is a factor in diseases such as asthma, heart disease and lung cancer. Commercial air purifiers aim for removing the small particles that are present in soot, smoke or car exhaust because these damaging particles are inhaled directly into the lungs.
With many sources of pollution in some parts of the world, however, air pollution also can contain a mix of hazardous gaseous molecules, such as carbon monoxide, formaldehyde, sulfur dioxide and other volatile organic compounds.
Typical air filters, which are made of micron-sized fibers of synthetic plastics, physically filter the small particles but aren’t able to chemically capture gaseous molecules. Furthermore, they’re most often made of glass and petroleum products, which leads to secondary pollution.
Soy captures nearly all pollutants
The WSU and Chinese team developed a new kind of air filtering material that uses natural, purified soy protein and bacterial cellulose – an organic compound produced by bacteria. The soy protein and cellulose are cost effective and already used in numerous applications, such as adhesives, plastic products, tissue regeneration materials and wound dressings.
Soy contains a large number of functional chemical groups – it includes 18 types of amino groups. Each of the chemical groups has the potential to capture passing pollution at the molecular level. The researchers used an acrylic acid treatment to disentangle the very rigid soy protein, so that the chemical groups can be more exposed to the pollutants. The resulting filter was able to remove nearly all of the small particles as well as chemical pollutants, said Zhong.
Filters are economical, biodegradable
Especially in very polluted environments, people might be breathing an unknown mix of pollutants that could prove challenging to purify. But, with its large number of functional groups, the soy protein is able to attract a wide variety of polluting molecules. “We can take advantage from those chemical groups to grab the toxics in the air,” Zhong said.
The materials are also cost-effective and biodegradable. Soybeans are among the most abundant plants in the world, she added. Zhong occasionally visits her native China and has personally experienced the heavy pollution in Beijing as sunny skies turn to gray smog within a few days. “Air pollution is a very serious health issue,” she said. “If we can improve indoor air quality, it would help a lot of people.”
The work is in keeping with WSU’s Grand Challenges, a suite of research initiatives aimed at large societal issues. It is particularly relevant to the challenge of sustaining health and its theme of healthy communities and interventions to sustain public health.
January 12, 2017 by Cynthia King
Source: Washington State