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Synthesis, Transformation Mechanism and Photocatalytic Properties of Various Morphologies Anatase TiO 2 Nanocrystals Derived From Tetratitanate Nanobelts
Author(s) -
Liu Leng,
Du Yien,
Niu Xianjun,
Li Wanxi,
Li Jun,
Yang Xiaojing,
Feng Qi
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802116
Subject(s) - anatase , materials science , photocatalysis , high resolution transmission electron microscopy , nanocrystal , transmission electron microscopy , chemical engineering , nanotechnology , selected area diffraction , solvothermal synthesis , chemistry , organic chemistry , catalysis , engineering
Rod‐like, rhombic, octahedral bipyramid‐shaped, cuboid, and spindle‐like anatase TiO 2 nanocrystals samples with part of {101}, {001} and {010} facets exposure were synthesized through a straightforward solvothermal treatment of layered tetratitanate nanobelt colloidal solution precursor. The shape and structural evolutionmechanism of the as‐synthesized anatase TiO 2 nanocrystals from the layered tetratitanate nanobelts were investigated by using X‐ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscope (TEM) and high‐resolution transmission electron microscope (HRTEM). The transformation from the layered tetratitanate nanobelts into the various morphologies anatase TiO 2 nanocrystals may experience two stages during the solvothermal process including an in situ topotactic dehydration reaction of the layered tetratitanate nanobelts, and a dissolution‐recrystallization reaction of the nanobelts anatase TiO 2 crystals along the different planes. Furthermore, the photocatalytic activity of the various morphologies anatase TiO 2 nanocrystals was also investigated and discussed, and compared to the benchmark P25 TiO 2 nanocrystals. The results revealed that the {010}‐faceted spindle‐like anatase TiO 2 nanocrystals exhibited the most superior photocatalytic activity for the degradation of methylene blue.