Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 233, Issue -, Pages 163-170Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2019.05.031
Keywords
Nanoanatase; Hydrothermal method; {100} planes; H2O2; Photocatalysis
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Funding
- National Natural Science Foundation of China [21373273]
- Open-End Fund for the Valuable and Precision Instruments of Central South University [CSUZC201813]
- Education Reform Project of Central South University [2016jy03, 2016CLYJG02]
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The anatase TiO2 nanopowders with exposed {100} planes were prepared by a hydrothermal method using H2O2 as morphology control reagent. The structures, morphologies and photoelectric properties of samples were studied by XRD, BET, TEM, UV-vis DRS and PL methods. The exposure of {100} planes is attributed to the introduction of H2O2. More addition of H2O2 leads to larger grain size. The exposed {101} planes are the electron accumulation planes with strong reduction (electron donate) property. The synergistic effect between {101} and {001} planes is unchanged whether {100} planes are exposed, which are shown by the photoreduction test of Ag+ ions. The oxidation (electron gain) ability order among planes, Ag+ and Pb2+ is {100}>Ag+>{101}>Pb2+, as shown by the further photooxidation result of Pb2+ ions. The exposed {100} planes of nanoatatase are helpful to improve the photocatalytic performance by decreasing the electron-hole recombination rate, as shown by the results of UV-vis DRS and PL tests.
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