Abstract
Nano TiO2 , one of the most effective photocatalysts, has extensive usein fields such as air purification, sweage treatment, water spitting, reduction of CO2, and solar cells. Nowadays, the most promising method to recycle nano TiO2during the photocatalysis is to immobilize TiO2onto matrix, such as polyvinyl alcohol (PVA). However, due to the slow water permeability of PVA after cross-linking, the pollutants could not contact with nano TiO2photocatalyst in time.
Highlights
Titanium dioxide, TiO2, one of the white pigments, is widely used in paints, plastics, and cosmetics
When TiO2 is exposed to sunlight, especially ultraviolet rays, its valance electrons moved to the conduction band, resulting in free electron-hole pair
Picture A shows that the pure polyvinyl alcohol (PVA) film is transparent, so it is very suitable for TiO2 loading
Summary
TiO2, one of the white pigments, is widely used in paints, plastics, and cosmetics. Different from silicon dioxide, calcium carbonate, clay, and other materials, TiO2 has its unique photocatalytic function. When TiO2 is exposed to sunlight, especially ultraviolet rays, its valance electrons moved to the conduction band, resulting in free electron-hole pair. The free electron-hole pair has strong oxidation-reduction capability and can react with oxygen and water in the air to produce reactive oxygen and hydroxyl radicals. Toluene, formaldehyde, bacteria, viruses and other pollutants adsorb on the surface of TiO2, they are going to combine with free electrons or holes, have an oxidation reduction reaction, and be decomposed into carbon dioxide, water, etc. TiO2 is one of the photocatalysts with huge potentials and has been widely appliedto air purification, sweage treatment, water spitting, reduction of CO2 andsolar cells [2,3,4,5]
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