Abstract: Crystalline
sodium tantalate doped
with La3+ ions
(La/NaTaO3) has been
successfully synthesized by sol-gel technique. The photocatalysts have
been prepared by mixing of TaCl5, NaOH, and
La(NO3)3.2H2O in
the aqueous solution
of H2O2. The
resulting materials are characterized by
X-ray diffraction (XRD),
Brunauer-Emmett-Teller
(BET), and transmission electron microscopy
(TEM) to provide
useful information about
crystallinity and morphology. All samples
are exactly indexed
as the pure
NaTaO3
orthorhombic structure with
the space group Pcmn. The XRD
spectra displayed a single-phase NaTaO3 structure without any
impurity phase, suggesting that
lanthanum is uniformly
incorporated into the
NaTaO3 lattice. TEM images
indicates that the
particle sizes of
the La-doped NaTaO3 powders
are approximately 30-80 nm,
while the particle
sizes of the
non-doped NaTaO3
are around 80-250
nm. Doping lanthanum in the NaTaO3
is able to prevent agglomeration, result in particle size, and better crystallinity.
The La/NaTaO3 crystal structures reveal that a certain amount of
lattice distortion due to the La3+ ions occupying the Na+ sites
results in the increase of crystallite size. Powder formation mechanisms for
both non-doped NaTaO3 and La-doped NaTaO3 are proposed
based on the experimental results.
Keywords: La-doped sodium tantalum oxide, photocatalyst,
sol-gel, perovskite, orthorhombic
Penulis: Husni Husin
Kode Jurnal: jpkimiadd110013
Artikel Terkait :
