Researchers at Washington State University have developed a soy-based air filter that can capture toxic chemicals such as carbon monoxide and formaldehyde current air filters can't.
The research could lead to better air purifiers, particularly in regions of the world that suffer from very poor air quality such as China. Engineers designed and tested the materials for the bio-based filter and report on their work in the journal Composites Science and Technology.
Working with researchers from the University of Science and Technology Beijing, the WSU team used a pure soy protein along with bacterial cellulose for an all-natural, biodegradable, inexpensive air filter.
The team included Weihong (Katie) Zhong, professor in the School of Mechanical and Materials Engineering, and graduate student Hamid Souzandeh.
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 to remove the small particles present in soot, smoke or car exhaust called PM2.5 because these damaging particles are inhaled directly into the lungs.
In some parts of the world, however, air pollution can also contain a mix of hazardous gaseous molecules such as carbon monoxide, formaldehyde, sulfur dioxide and other volatile organic compounds.
Typical air filters are usually made of micron-sized fibers of synthetic plastics and physically filter the small particles but aren't able to chemically capture gaseous molecules. The downside is they're most often made of glass and petroleum products, which leads to secondary pollution.
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 and includes 18 types of amino groups. Each of the chemical groups has the potential to capture passing pollution at the molecular level.
Researchers used an acrylic acid treatment to disentangle the very rigid soy protein, so the chemical groups can be more exposed to pollutants.
The resulting filter was able to remove nearly all of the small particles as well as chemical pollutants, said Zhong.
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," said Zhong.
The materials are also cost-effective and biodegradable. Soybeans are among the most abundant plants in the world.
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."
In addition to the soy-based filters, researchers also developed gelatin- and cellulose-based air filters. They are also applying the filter material on top of low-cost and disposable paper towel to reinforce it and to improve its performance.
They have filed patents on the technology and are interested in commercialization opportunities.
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.