Grafted iron(iii) ions significantly enhance NO₂ oxidation rate and selectivity of TiO₂ for photocatalytic NO_x abatement

Abstract

By grafting small amounts of iron ions onto TiO2, the rate of photocatalytic oxidation of NO2 is increased by a factor of 9.

A Holistic Approach to Model the Kinetics of Photocatalytic Reactions

“…The importance of photocatalysis in fundamental and applied science has expanded tremendously over the last decades (Schneider et al, 2014 ; Augugliaro et al, 2015 ; Balzani et al, 2015 ; Romero and Nicewicz, 2016 ). Next to applications of heterogeneous photocatalysis in the removal of air pollutants (Ballari and Brouwers, 2013 ; Patzsch et al, 2018 ) and waste-water treatment (Alfano et al, 2000 ; Malato et al, 2009 ), a variety of applications in the field of organic synthesis (Friedmann et al, 2016 ; Bloh and Marschall, 2017 ) have emerged, particularly using molecular photoredox catalysts (Zeitler, 2009 ; Romero and Nicewicz, 2016 ).…”

On the importance of catalysis in photocatalysis: Triggering of photocatalysis at well-defined anatase TiO2 crystals through facet-specific deposition of oxygen reduction cocatalyst

“…Our study addresses several important aspects of photocatalysis at well-defined anatase TiO2 crystals, and, based on that, provides also a good platform for a more general reconsideration of factors of the reaction rate of oxygen reduction by photogenerated electrons, which is known to play a key role in photocatalytic degradation of organic compounds, 34,35,37,56,67,68,[70][71][72] especially when TiO2 particles are relatively large (size > 1 m). 52 Finally, we found that only platinized {101} facets contribute to photocatalysis.…”

Atomic‐Level Charge Separation Strategies in Semiconductor‐Based Photocatalysts

“…However, it is still challenging to inhibit recombination the photoinduced electrons and holes on the photocatalysts’ surface. Based on the atomic compositions, arrangement states and bonding networks termination on the surface of semiconductor‐based photocatalysts, some effective atomic‐level surface charge separation strategies, such as surface vacancy formation, [ 150–152 ] surface atom doping, [ 153–155 ] single atom loading [ 156–158 ] and ion grafting, [ 159–161 ] have been proposed to directly regulate the in‐plane and 3D spatial surface electronic configuration. Such strategies allowed more surface charges to effectively migrate to specific catalytic active sites, thereby improving the photocatalytic activity ( Figure ).…”