| Direct Synthesis of Urchin-Like N-doped TiO2 Microstructures
with Enhanced Photocatalytic Properties |
Yuhuan Liu,a Yiwei Wu,a Yi Zhou,a,* Yutang Wang,b Luyue Yanga and Chaocheng Lia
page : 155-160
DOI : 10.1080/0371750X.2016.1202142 |
| Abstract |
| N-doped urchin-like TiO2 (NUT) with enhanced photocatalytic properties was prepared through
a surfactant-free solvothermal treatment approach using carbamide as nitrogen precursor.
The prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron
spectroscopy (XPS), scanning electron microscopy (SEM) and UV-Vis diffuse reflectance
spectroscopy. Effects of different carbamide contents on the crystal phase and the
photocatalytic performance of the prepared samples were discussed. XPS results showed
that N doping into TiO2 formed Ti-N-O structure. SEM results showed the change of morphology
after superfluous doping. N doping can form a new impurity energy level in TiO2 forbidden
band and provide a favourable nucleation for TiO2 catalyst. In addition, 0.1 M NUT showed
the highest photocatalytic activity among all the prepared samples upon degradation of
rhodamine B under sunlight irradiation. The mechanism of organic pollutants degradation
on the surface of prepared phtocatalytic was also discussed. N-doped TiO2 catalysts showed
enhanced photocatalytic properties than the pure TiO2 materials which could be attributed to
the synergistic effect of the special superstructure and lower energy requirement for electron
transport due to N doping in the TiO2 catalyst.
[Keywords: TiO2, Photocatalytic, N-doped, Solvothermal] |
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