In fact, photocatalyst is a literal translation of Japanese photocatalyst, and photosynthesis of plants cannot be separated from photocatalyst. If photocatalyst is toxic, then the green plants such as vegetables we eat every day are toxic. Therefore, the toxicity of photocatalyst is a sign of ignorance, a deliberate smear for some purpose, or the use of fake photocatalyst, such as chemicals. Photocatalyst is widely used in food additives and cosmetics, which is very safe and harmless to human body and can be used for food preservation.
Photocatalyst has been used safely abroad for decades, and it was widely used in China after SARS in 2002. Mature and stable technology, non-toxic and harmless. Titanium dioxide can be directly applied to the skin. For example, sunscreen uses 20 nm rutile titanium dioxide to absorb solar light waves, thus achieving the sunscreen effect of isolating ultraviolet rays.
However, masks should be worn during construction, and the photocatalyst itself is stable and nontoxic. We know that PM2.5 is a particle with a diameter less than 2.5 microns, and the nanometer is 1000 times smaller than the micron. Inhalation of nanoparticles into human body will definitely be harmful to health. Usually we are exposed to photocatalyst solution. After being atomized by a high-pressure spray gun, nanoparticles and water molecules are mixed together and are not easy to be inhaled.
Wear a mask to protect, on the one hand, to prevent the inhalation of photocatalyst droplets, but also to prevent the newly renovated room from inhaling strong harmful gases, to ensure the respiratory health of construction workers.