Yq. Wang et al., The preparation, characterization, photoelectrochemical and photocatalyticproperties of lanthanide metal-ion-doped TiO2 nanoparticles, J MOL CAT A, 151(1-2), 2000, pp. 205-216
Lanthanide metal-ion-doped TiO2 nanoparticles were prepared with hydrotherm
al method and characterized with X-ray diffraction (XRD), transmission elec
tron microscopy (TEM), inductively coupled plasma (ICP) and fluorescence sp
ectrum. The results showed that a small part of metal ions entered into the
lattice of TiO2 and others adsorbed on the surface of TiO2. The photoelect
rochemical and photocatalytic properties of these lanthanide metal-ion-dope
d TiO2 nanoparticles were investigated and the results showed that the phot
oresponse of Eu3+-, La3+-, Nd3+- and Pr3+-doped TiO2 electrodes were much l
arger and that of Sm3+-doped TiO2 electrode was a little larger than that o
f undoped TiO2 electrode, indicating that the photogenerated carriers were
separated more efficiently in Eu3+, La3+-, Nd3+- and Pr3+-doped TiO2 nanopa
rticles than in undoped TiO2 nanoparticles. The photocatalytic degradation
of rhodamine B (RB) was conducted in the suspension of lanthanide metal-ion
-doped TiO2 nanoparticles, and its first-order reaction rate constant (k) a
nd average initial rate (r(ini)) were significantly higher in the presence
of Eu3+-, La3+-, Nd3+- and Pr3+-doped TiO2 nanoparticles than those in the
presence of undoped TiO2 nanoparticles. The enhanced photocatalytic degrada
tion rate of RE in the presence of Eu3+-, La3+-, Nd3+- and Pr3+-doped TiO2
nanoparticles is attributed to increased charge separation in these systems
. The effect of the content of La3+ on the reaction parameters (k and r(ini
)) was also investigated and the result showed that there was an optimal va
lue (ca. 0.5%) of the content of La3+ to make the rate constant (k) and ave
rage initial rate (r(ini)) reach the maxima. (C) 2000 Elsevier Science B.V.
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