Premium
FacileSynthesis of Anatase TiO 2 Nanocrystals with Co‐Exposed{101}, {010}/{100} and [111]‐Facets for EfficientPhotodegradation of Methylene Blue
Author(s) -
Du Yien,
Niu Xianjun,
Zhang Caifeng,
Li Xiaodong,
Cai Xuemei,
Guo Yanqing,
Wang Pengfei
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202004195
Subject(s) - anatase , high resolution transmission electron microscopy , materials science , photocatalysis , transmission electron microscopy , nanocrystal , photoluminescence , methylene blue , analytical chemistry (journal) , nuclear chemistry , nanotechnology , chemistry , catalysis , optoelectronics , organic chemistry
Cuboid‐shaped anatase TiO 2 nanocrystals with co‐exposed {101} and [111]‐facets (or {101} and {100} facets), diamond‐shaped, rod‐like and irregular anatase TiO 2 nanocrystals with dominant {010} facets were controllably synthesized from titanium (IV) ethoxide (TEOT) using HF as a capping agent via a facile sol‐gel procedure, and characterized by X‐ray powderdiffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), nitrogen adsorption, photoluminescence (PL) spectra, UV‐vis diffuse reflectance spectra,and electrochemical impedance spectroscopy (EIS). For the as‐prepared anatase TiO 2 nanocrystals, the 0.5HF‐TiO 2 revealed the best photocatalytic efficiency under UV light irradiation: 94.1 % of methylene blue (MB) was photodegraded within 90 min. The reaction rate constant k (min −1 ) was 1.39, 1.47, 1.59, 1.66, 1.92, 2.75, and 30.5 times higher than that of 2.0HF‐TiO 2 (2.20×10 −2 min −1 ), 1.5HF‐TiO 2 (2.07×10 −2 min −1 ), 1.0HF‐TiO 2 (1.92×10 −2 min −1 ), 2.5HF‐TiO 2 (1.84×10 −2 min −1 ), 3.0HF‐TiO 2 (1.59×10 −2 min −1 ), Bodi‐TiO 2 (1.11×10 −2 min −1 ), and the blank sample (0.10×10 −2 min −1 ), respectively. Compared to other as‐prepared anatase TiO 2 nanocrystals with the similar co‐exposed crystal facets, the highest efficiency of 0.5HF‐TiO 2 could be attributed to the minimum crystal size,narrower pore size distribution, the maximum specific surface area, the lowest PL intensity and charge‐transfer resistance, andthe smallestrecombination resistance.