To develop TiO 2 -based photocatalysts with visible light activity for better solar energy utilization, a simple flash oxidation method was developed by calcining commercial TiN nanoparticle to prepare N-doped TiO 2 photocatalyst and TiN/TiO 2 composite photocatalysts through the modulation of the calcination time and temperature. It was found that more energy and processing time were needed to prepare N-doped TiO 2 photocatalyst than that of TiN/TiO 2 composite photocatalyst during this process, while TiN/TiO 2 composite photocatalyst had a better visible light absorption/photocatalytic performance than that of N-doped TiO 2 photocatalyst prepared from the oxidation of the same TiN precursor. Thus, the preparation of TiN/TiO 2 composite photocatalyst from TiN precursor should be a more preferred approach than the preparation of N-doped TiO 2 photocatalyst for visible-light-activated photocatalysis for its cost-effectiveness.
Titanium dioxide–titanium nitride composite (TiO2–TiN) nanoparticles (NPs) were used as a support to load nickel nano particles for the dehydrogenation of ammonia borane (AB) which is a new method. The composite support was fabricated via a simple ultrasonic mixing route, followed by the in situ loading of Ni NPs using a liquid-phase reduction reaction method where sodium borohydride was adopted as a reducing agent. The synthesized samples were characterized by X-ray diffraction spectra (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Ultra Violet-Visible (UV–vis) analyses. The characterization results show that the Ni NPs uniformly dispersed on the support and existed in both zero and oxidized states. Compared with bare TiO2, Ni loading on TiO2–TiN exhibited a higher catalytic activity toward dehydrogenation of AB both under dark and under sunlight irradiation. Ni/10%TiN–TiO2 showed a hydrogen evolution rate with a turnover frequency (TOF) of 8.01 molH2·min–1·molcat–1 at 25 °C under sunlight. The loading of Ni NPs lowered the band gap energy of TiO2, resulting in the enhanced absorption of sunlight. The addition of TiN that acts as electron scavengers improved the separation efficiency of electron–hole pairs. Titanium dioxide–titanium nitride composites play an important role in improving the catalytic dehydrogenation of AB by nickel-based catalysts.
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