TY - JOUR

T1 - Influence of the Dopant Concentration on the Photocatalytic Activity

T2 - AI-Doped TiO2

AU - Murashkina, Anna A.

AU - Murzin, Petr D.

AU - Rudakova, Aida V.

AU - Ryabchuk, Vladimir K.

AU - Emeline, Alexei V.

AU - Bahnemann, Detlef W.

PY - 2015/11/5

Y1 - 2015/11/5

N2 - A set of Al-doped titania x-Al-TiO2, (x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.1 wt % Al) has been synthesized by a sol gel method and tested in the reaction of the photocatalytic degradation of phenol in aqueous suspension. XRD and Raman studies show that the TiO2 samples have a mixed-phase rutile-anatase crystalline structure with linear increase of the anatase fraction from 0.0 wt % for 0.0-Al-TiO2 up to 18 wt % for 1.1-Al-TiO2. A decrease of the particle size from 800 to 50 nm and an increase of the specific surface area from 1.7 m(2)/g up to 28 m2/g with increased content of Al have been observed. The data of XRD, XPS, Raman spectroscopy, and EDS techniques show rather homogeneous aluminum distribution with only the Al(3+) oxidation state of aluminum incorporated in the TiO2 lattice. The bandgap energy E-g = (2.93 +/- 0.1) eV corresponding to indirect allowed transitions does not depend on the aluminum content within the 0.0-1.1 wt % Al concentration range. The photocatalytic testing of Al-doped TiO2 samples in the reaction of phenol degradation shows the existence of a maximal initial rate of phenol degradation at an Al concentration of about 0.5 wt %.

AB - A set of Al-doped titania x-Al-TiO2, (x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.1 wt % Al) has been synthesized by a sol gel method and tested in the reaction of the photocatalytic degradation of phenol in aqueous suspension. XRD and Raman studies show that the TiO2 samples have a mixed-phase rutile-anatase crystalline structure with linear increase of the anatase fraction from 0.0 wt % for 0.0-Al-TiO2 up to 18 wt % for 1.1-Al-TiO2. A decrease of the particle size from 800 to 50 nm and an increase of the specific surface area from 1.7 m(2)/g up to 28 m2/g with increased content of Al have been observed. The data of XRD, XPS, Raman spectroscopy, and EDS techniques show rather homogeneous aluminum distribution with only the Al(3+) oxidation state of aluminum incorporated in the TiO2 lattice. The bandgap energy E-g = (2.93 +/- 0.1) eV corresponding to indirect allowed transitions does not depend on the aluminum content within the 0.0-1.1 wt % Al concentration range. The photocatalytic testing of Al-doped TiO2 samples in the reaction of phenol degradation shows the existence of a maximal initial rate of phenol degradation at an Al concentration of about 0.5 wt %.

KW - TITANIUM-DIOXIDE

KW - HETEROGENEOUS PHOTOCATALYSIS

KW - PHASE-STABILITY

KW - ALUMINUM

KW - NANOPARTICLES

KW - TRANSFORMATION

KW - SEMICONDUCTOR

KW - RUTILE

KW - PERSPECTIVE

KW - SELECTIVITY

U2 - 10.1021/acs.jpcc.5b06252

DO - 10.1021/acs.jpcc.5b06252

M3 - статья

VL - 119

SP - 24695

EP - 24703

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 44

ER -