Boosting the photocatalytic degradation of ethyl acetate by a Z-scheme Au–TiO₂@NH₂-UiO-66 heterojunction with ultrafine Au as an electron mediator

Abstract

TiO2 based photocatalytic oxidation has been regarded as a promising technology for VOCs removal, while it remains challenging by the limited visible light response and low photogenerated charge separation efficiency....

Metal–organic framework‐based heterojunction photocatalysts for organic pollutant degradation: design, construction, and performances

“…As an example, tiny TiO 2 nanoparticle supported Au clusters were incorporated into NH 2 -UiO-66 to create the ASS Z-scheme photocatalyst for promoting the photocatalytic degradation of ethyl acetate in the gas phase. 123 The obtained Au-TiO 2 @NH 2 -UiO-66 nanocomposite helped to broaden the light absorption of titanium dioxide from the UV into visible region due to the LSPR of Au nanoclusters. Furthermore, in the Z-scheme Au-TiO 2 @NH 2 -UiO-66 heterojunction, ultrafine Au NPs act as electron mediators and can significantly accelerate photogenerated electron transfer.…”

“…Some more simple MOF‐based Z‐scheme heterojunctions containing metal oxides, 123,127,178 complex oxides (perovskites 124,179‐181 and spinel), 182 and chalcogenides 121,122,183 are not inferior in activity. As an example, tiny TiO 2 nanoparticle supported Au clusters were incorporated into NH 2 ‐UiO‐66 to create the ASS Z‐scheme photocatalyst for promoting the photocatalytic degradation of ethyl acetate in the gas phase 123 . The obtained Au‐TiO 2 @NH 2 ‐UiO‐66 nanocomposite helped to broaden the light absorption of titanium dioxide from the UV into visible region due to the LSPR of Au nanoclusters.…”

“…Despite the ternary composite exhibiting a high activity, the use of such complex ternary composites may not be appropriate due to the multi-stage and high production costs. Some more simple MOF-based Z-scheme heterojunctions containing metal oxides, 123,127,178 complex oxides (perovskites 124,[179][180][181] and spinel), 182 and chalcogenides 121,122,183 are not inferior in activity. As an example, tiny TiO 2 nanoparticle supported Au clusters were incorporated into NH 2 -UiO-66 to create the ASS Z-scheme photocatalyst for promoting the photocatalytic degradation of ethyl acetate in the gas phase.…”

“…The first method was used for the preparation of NH 2 ‐MIL‐101(Fe)/BiVO 4 , 120 MIL‐88A(Fe)/MoS 2 , 121 Ag/NH 2 ‐MIL‐125(Ti)/CdS, 122 and UiO‐66/BiFeO 3 114 heterostructures. The heterojunction photocatalysts MIL‐88A(Fe)/Bi 2 WO 6 , 54 TiO 2 @NH 2 ‐UiO‐66, 123 Bi 2 WO 6 /NH 2 ‐UiO‐66, 124 Bi 2 O 3 @UiO‐66, 125 and g‐C 3 N 4 /NH 2 ‐MIL‐101(Fe) 126 were prepared using the second approach. It is quite difficult to evaluate the most promising of these methods because of there are no comparative studies where both techniques have been employed using the same MOF and second semiconductor.…”

Gas-phase photoelectrocatalytic oxidation of volatile organic compounds using defective WO3/TiO2 nanotubes mesh

“…Remarkable technologies, such as catalytic combustion, adsorption, biological treatment and photocatalytic oxidation (PCO), have been developed to remove VOCs. 4,6–9 PCO has advantages over the other approaches mentioned because of its viability, operation at ambient temperature, and environmentally friendly products, i.e. , carbon dioxide and water.…”