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Nearly second-order (1.87th) light-intensity dependence was observed for photocatalytic oxidation of formic acid in aqueous solutions induced by visible-light surface-plasmon resonance absorption of gold nanoparticles loaded on titanium(IV) oxide prepared by the colloid-photodeposition method using a hole scavenger, indicating that the photocatalytic reaction proceeds through a non-linear process.
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Tanaka et al. (2013) studied this question.
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