In the battle against bacteria, researchers at the University of Illinois have developed a powerful new weapon – an enhanced photocatalytic disinfection process that uses visible light to destroy harmful bacteria and viruses, even in the dark.
Based upon a new catalyst, the disinfection process can be used to purify drinking water, sanitize surgical instruments and remove unwanted fingerprints from delicate electrical and optical components.
"The new catalyst also has a unique catalytic memory effect that continues to kill deadly pathogens for up to 24 hours after the light is turned off," said Jian Ku Shang, a professor of materials science and engineering at the University of Illinois.
Shang is corresponding author of a paper that is scheduled to appear in the Journal of Materials Chemistry.
Shang's research group had previously developed a catalytic material that worked with visible light, instead of the ultraviolet light required by other catalysts. This advance, which was made by doping a titanium-oxide matrix with nitrogen, meant the disinfection process could be activated with sunlight or with standard indoor lighting.
"When visible light strikes this catalyst, electron-hole pairs are produced in the matrix," Shang said. "Many of these electrons and holes quickly recombine, however, severely limiting the effectiveness of the catalyst."
To improve the efficiency of the catalyst, Shang and collaborators at the University of Illinois and at the Chinese Academy of Sciences added palladium nanoparticles to the matrix. The palladium nanoparticles trap the electrons, allowing the holes to react with water to produce oxidizing agents, primarily hydroxyl radicals, which kill bacteria and viruses.
When the light is turned off, the palladium nanoparticles slowly release the trapped electrons, which can then react with water to produce additional oxidizing agents.
"In a sense, the material remembers that it was radiated with light," Shang said. "This 'memory effect' can last up to 24 hours."
Although the disinfection efficiency in the dark is not as high as it is in visible light, it enables the continuous operation of a unique, robust catalytic disinfection system driven by solar or other visible light illumination.
In addition to environmental applications, the new catalyst could also be used to remove messy, oily fingerprints from optical surfaces, computer displays and cell phone screens, Shang said.
Product Locator: Spring and Early Mother's Day Gift Guide for Infection Prevention Personnel
March 27th 2024Whether it's a spring holiday, birthdays, or no reason at all, infection prevention personnel love to give and receive gifts that help at the end of a stressful day. Infection Control Today® offers some gift ideas for infection prevention personnel and their families.
The Role of Environmental Hygiene in Preventing Antimicrobial Resistance
March 19th 2024Uncover the pivotal role of environmental hygiene in thwarting antimicrobial resistance (AMR) for infection prevention teams. Learn how rigorous cleaning protocols and advanced technologies enhance patient safety and combat AMR.