Scientists have designed catalyst-coated lampshades that transform indoor air pollutants into harmless compounds.
“Although the concentration of VOCs in a home or office is low, people spend more than 90% of their time indoors, so the exposure adds up over time,” added Kim.The coated lampshades are targeting these VOCs, which they want to break down to acetaldehyde , and then into formic acid , and finally into carbon dioxide and water. After turning on the lampshade, the inside temperature reaches about 250 degrees Fahrenheit, which is warm enough to activate the catalysts and decompose acetaldehyde.
The team is likely to turn to a copper-based catalyst, which would also be a disinfectant. So, they anticipate that the copper catalyst could kill airborne microorganisms. “This was the first demonstration to utilize waste heat from lamp sources,” said Kim. “Our ultimate goal is to develop a hybrid catalyst that can utilize the full spectrum produced by light sources, including UV and visible light, as well as waste heat.”
The lampshades currently work with halogen and incandescent light bulbs only, but the team is extending the technology so it will also be compatible with LEDs.
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