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Negative oxygen ion (NOI) production by enhanced photocatalytic TiO₂/GO composites anchored on wooden substrates
- Han, Xiaoshuai, Wang, Zhenxing, Zhang, Qinqin, Lv, Yan, Pu, Junwen
- Holzforschung 2019 v.73 no.4 pp. 415-422
- adsorption, dipping, dispersants, dyes, ions, irradiation, light, oxygen, photocatalysis, recycling, silica, surface area, titanium dioxide, wood
- Titanium dioxide (TiO₂)/graphene oxide (GO)-treated wood was fabricated through a one-step hydrothermal-vacuum dipping technique, in which silica sol serves as a dispersant and linker owing to its good stability and high surface area, while the visible light activates TiO₂/GO and negative oxygen ions (NOI) arise. This approach exhibits a super dye adsorption capacity and enhanced photocatalytic efficiency. In focus was the effect of the three-dimensional (3D) GO dopant on the NOI production, which was very high in this system. Namely, the concentration of NOI is up to 1710 ions cm⁻³ after 60 min visible light irradiation. Moreover, recycling experiments show that the properties of a TiO₂/GO-wood system are stable. The TiO₂/GO-treated wood is a healthy, environmentally friendly material which is promising for indoor decoration.