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Visible-light-driven nitrogen-doped TiO 2 was synthesized using a novel nitrogen-ion donor of hydrazine hydrate. Low-concentration (∼0.2at%) nitrogen species and Ti 3+ were detected in the TiO 2 -based photocatalyst by X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectroscopy. The trace amount of Ti–N would contribute to the minor band-gap...
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