Novel adsorption and photocatalytic oxidation for removal of gaseous toluene by V-doped TiO₂/PU under visible light

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>In this study, V was used as a dopant to defect into the TiO<SUB>2</SUB> lattice, leading to formation of Ti<SUP>3+</SUP> and V<SUP>4+</SUP> in the lattice. The presence of Ti<SUP>3+</SUP> and V<SUP>4+</SUP> introduced into the TiO<SUB>2</SUB> lattice increased the electron–hole pair generation capacity and electron–hole pair separation efficiency of the TiO<SUB>2</SUB>, leading to enhancement of the photocatalytic activity of the photocatalyst. Porous polyurethane (PU) was used to immobilize the V-doped TiO<SUB>2</SUB> by creating chemical bonds. The use of porous substrate contributed to the increased adsorption ability of the enhanced photocatalyst, as well as expanded its application for the removal of toluene from aerosols. Under dark conditions, the V-TiO<SUB>2</SUB>/PU only exhibited adsorption ability for toluene treatment in aerosol. Under visible light conditions, the V-TiO<SUB>2</SUB>/PU exhibited high photocatalytic oxidation ability for the removal of toluene in aerosol. The photocatalytic oxidation ability was found to depend on the V to TiO<SUB>2</SUB> ratio. The optimal V content in V/TiO<SUB>2</SUB> for enhancing the photocatalytic activity of TiO<SUB>2</SUB> was determined to be 6wt%. Even under visible light irradiation, the 6% V-TiO<SUB>2</SUB>/PU sample could photocatalytically remove 80% of the toluene in 200-ppmV inlet gas, while 89.3% of the removed amount was mineralized into CO<SUB>2</SUB> and H<SUB>2</SUB>O.</P> <P><B>Highlights</B></P> <P> <UL> <LI> V doping was used to enhance the photocatalytic activity of TiO<SUB>2</SUB> photocatalyst. </LI> <LI> The enhanced TiO<SUB>2</SUB> was fixed on porous polyurethane (PU) by chemical bonds. </LI> <LI> The PU was used as a substrate to increase the adsorption ability of the photocatalyst. </LI> <LI> V-TiO<SUB>2</SUB>/PU adsorbed and photocatalytically oxidized toluene gas under visible light. </LI> <LI> The V/TiO<SUB>2</SUB> ratio of 6wt% was optimal for enhancing the photocatalytic activity. </LI> </UL> </P>