Photodegradation of Formaldehyde by Photocatalyst TiO sub(2): Effects on the Presences of NO, SO sub(2) and VOCs

Tests investigated the removal of formaldehyde, a common indoor air pollutant in modern structures, using photocatalysis techniques. The project also considered the influences of diverse other common pollutants on the photodegradation of formaldehyde, including nitrogen monoxide, sulfur dioxide, and volatile organic compounds (VOCs). Evidence showed that formic acid was the primary intermediate formed due to the photodegradation of formaldehyde. Researchers determined that the conversion of formaldehyde and the yield of formic acid declined with increasing humidity. Conversion of formaldehyde was promoted by the presence of NO. The conversion of formaldehyde was inhibited by the presence of sulfate ion formed in the presence of SO sub(2). Inhibition effects associated with VOCs are detailed.