Triplet-triplet annihilation upconversion (TTA-UC) has been attracting attention in various fields as a promising tool to efficiently generate shorter-wavelength photon than the incident light. Compared to conventional UC technologies (e.g.,...
An
enhancing effect of peroxymonosulfate (PMS) on photocatalytic
activity has previously been demonstrated, but the research focus
was concentrated primarily on the extent to which treatment efficiency
was improved. To further comprehend the role of PMS, this study examined
the TiO2 photocatalytic systems in the presence of PMS
for the oxidation of diverse organics and showed that the extent of
performance enhancement via PMS addition was substrate-dependent.
This resulted from the involvement of multiple oxidants owing to the
dual role of PMS as an electron acceptor and a radical precursor,
confirmed in the open circuit potential shifts and electron paramagnetic
resonance spectra. Surface platinization, typically adopted to modulate
charge carrier dynamics in photocatalysis, caused the nonphoton-driven
degradative pathway, i.e., mediated electron transfer involving PMS
as a two-electron acceptor, and promoted the one-electron reduction
of PMS to sulfate radicals (SO4
•–). The contribution of SO4
•– was
assessed based on efficiencies for decarboxylation and hydroxylation,
isomer distribution in the hydroxylated intermediates, the quenching
effect of alcohols, and net conversion of methanol to formaldehyde.
Relying on the selective reactivity of Pt-activated PMS, Pt-TiO2/PMS outperformed bare TiO2/PMS in oxidatively
treating the binary mixtures of organics and enabled effective organic
degradation under periodic light irradiation.
A hematite photoanode with dual-modification by Sn doping and H2 treatment exhibits outstanding photoelectrochemical water splitting performance with improved charge transport and separation because of the synchronous presence of Sn4+ and Vo.
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