Quantum yields of the photocatalytic oxidation of formate in aqueous TiO2 suspensions under continuous and periodic illumination

Article Abstract:

The photocatalytic oxidation of formate in ~ 10nm TiO2 nanoparticle suspensions under periodic illumination behaves kinetically as a homogenous photochemical system. Absence of competing intermediates and at the slow rates typical of most photocatalytic studies, quantum yields under periodic illumination do not exceed those attained by continuous operation at equivalent average photon absorption rates.

Oxidation reduction reactions

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Electronic band structure and photocatalytic activity of Ln (sub 2)Ti (sub 2)O( sub 7) (Ln =La,Pr,Nd)

Article Abstract:

A present study revealed that photocatalytic activity is highly dependent on the electronic band structure as well as on the bulk structure of photocatalyst material. The shift of the Ln 4f level in Ln (sub 2) Ti (sub 2) O (sub 7) made it possible for the band-gap energy of both Pr (sub 2) Ti (sub 2) O (sub 7) and Nd (sub 2) Ti (sub 2) O (sub 7) to decrease.

Layer structure (Solids)

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Time scales and pH dependence of the redox processes determining the photocatalytic efficiency of TiO2 nanoparticles from periodic illumination experiments in the stochastic regime

Article Abstract:

The photochemical experiments under periodic illumination in the stochastic regime reveals two rate-determining intermediates having different lifetimes with opposite pH dependences. The reducing species becomes more active at higher pH, the converse being valid for the oxygen carrier, as a result of the shift in the electrical potential of TiO2 particles.

Electric properties, Oxidation-reduction reactions, Titanium dioxide, Voltage, Electric potential

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