THESIS
2017
xxii, 277 pages : illustrations (some color) ; 30 cm
Abstract
Pollution control to avail the protection of the environment is one of the key challenges of the
current world. TiO
2 based photocatalytic systems has the unique combination of activity,
selectivity, stability, environmental benignity, availability and low price to tackle the
environmental pollution. These allows TiO
2-based photocatalytic system to be the most promising
in environmental research. In this current research, different one dimensional TiO
2 nanostructures
are synthesized successfully using hydrothermal method. Spiral wall titanate nanotubes are
prepared from the anatase TiO
2 nanoparticles in both conventional and microwave-assisted
alkaline hydrothermal approach. TiO
2 nanowire arrays (TiNWA) were prepared on the FTO
substrate from the titanium isopropoxide precurso...[
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Pollution control to avail the protection of the environment is one of the key challenges of the
current world. TiO
2 based photocatalytic systems has the unique combination of activity,
selectivity, stability, environmental benignity, availability and low price to tackle the
environmental pollution. These allows TiO
2-based photocatalytic system to be the most promising
in environmental research. In this current research, different one dimensional TiO
2 nanostructures
are synthesized successfully using hydrothermal method. Spiral wall titanate nanotubes are
prepared from the anatase TiO
2 nanoparticles in both conventional and microwave-assisted
alkaline hydrothermal approach. TiO
2 nanowire arrays (TiNWA) were prepared on the FTO
substrate from the titanium isopropoxide precursor by acid hydrothermal process. It is found that
with different modified technique it is possible to alter the crystal phase, nanowire length, width
and density of the TiNWAs. The produced nanostructures are then directly doped with B
+, F
+, P
+,
As
+ and BF
2+ ions by ion implantation method. Different acceleration energies and ion fluxes are
used to optimize the implantation parameters to reduce the band gap energies of the multiwalled
titanate nanotubes (TiNT). Different transition metals (Ni, Cr, Fe and Mn) are decorated on the
outer wall of the multiwalled titanate nanotubes. Transition metals are deposited from the
fulminating complex solution of the respective metals. Finally, different novel nonmetal/metal co-functionalized
titanate nanotubes are obtained for the first time of its type. The morphology,
texture, structure and composition of the novel nanostructures are characterized with different
state-of-the-art techniques. The performance of the nanostructured photocatalysts are analyzed
in terms of degree of degradation of different chlorophenols in different water matrix and
different light irradiation conditions. The active species responsible for various catalysts are
identified and the mechanism of generation of those species are also discussed. From the liquid
chromatography and mass spectrometry the reaction pathways and the possible intermediates of
the photocatalytic oxidation processes are identified.
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