Promoting ring-opening efficiency for suppressing toxic intermediates during photocatalytic toluene degradation via surface oxygen vacancies

Dark Reactive Oxygen Species Generation in ReVO4:Eu3+ (Re = Gd, Y) Nanoparticles in Aqueous Solutions

“…On the other hand, in NPs characterized by a high amount of structural defects, for instance oxygen vacancies (V O ) in oxide NPs, such defects could serve as traps for charge carriers and are responsible for ROS production in NPs even without UV irradiation (in the dark). − In our previous works, we showed that GdYVO 4 :Eu 3+ , GdVO 4 :Eu 3+ , and LaVO 4 :Eu 3+ NPs exhibit photo–catalytic activity (ROS production) at UV-light irradiation, in particular • OH generation ability. , Moreover, due to a high amount of V O in small GdYVO 4 :Eu 3+ NPs, which is the feature of metal-oxide NPs, and consequently V 4+ –V O –V 4+ sites in the crystal structure of the NPs, both ROS production and scavenging were observed. , So, we can suppose that these sites could serve as charge-carrier traps and ROS generation should be observed in the dark condition as well. To explore such an effect, we analyze the process of dye DiD-C3S dark degradation in water solutions containing pre-irradiated NPs (Figure a).…”

“…Electrons and holes on the surface of NPs in water solutions can react with molecular oxygen and water molecules to produce O 2 •– , • OH, H 2 O 2 , 1 O 2 , and some other ROS through oxidation and reduction processes. , The efficiency of ROS generation is governed by the electronic structure of semiconductor NPs and the redox potentials ( E H ) of ROS generation reactions. It was shown that the photocatalytic activity of semiconductor NPs depends strongly on particle size, morphology, crystallinity, and disordered surface states, in particular, oxygen vacancies, V O , which facilitate the electron/hole pair separation and adsorption of reactants (H 2 O and O 2 ). − Thus, structural defects, such as V O , can be regarded as desired defects increasing the semiconducting oxide NPs catalytic activity.…”

Constructing highly dispersed 0D Co3S4 quantum dots/2D g-C3N4 nanosheets nanocomposites for excellent photocatalytic performance

“…The extension of time means that the possibility of photogenerated electrons or holes participating in the photocatalytic reaction is increased [45]. Combined with PL measurement, it can be concluded that the modification of Co 3 S 4 quantum dots can effectively inhibit the recombination of photogenerated carriers of CNNS, and greatly increase the light conversion efficiency of visible light [46][47][48]. Transient photocurrent responses in Fig.…”

Anisotropic Au-ZnO photocatalyst for the visible-light expanded oxidation of n-hexane

“…Light-emitting diodes-LEDs, novel reactor configurations and so on) [9,10,[12][13][14][16][17][18][19][20][21][22][23][24][25]. In addition, it is also necessary to boost the development of novel photocatalytic materials that can overcome the inherent burdens of TiO2 and are able to take advantage of the full solar spectrum instead of the limited UV range attributed to TiO2 [26][27][28][29][30][31][32][33][34].…”