Visible Light Assisted Degradation of Eosin Yellow using Heteroatom Functionalized TiO2 Nanomaterial.

Desta Shumuye Meshesha.et al. Int. Journal of Engineering Research and Application www.ijera.com
ISSN : 2248-9622, Vol. 6, Issue 8, ( Part -1) August 2016, pp.110-119
www.ijera.com 110|P a g e
Visible Light Assisted Degradation of Eosin Yellow using
Heteroatom Functionalized TiO2 Nanomaterial.
Desta Shumuye Meshesha a
, Siva Rao Tirukkovalluri a
*, atangi Ravi Chandra
a
,Sreedhar Bojja b
a. Department of Inorganic and Analytical Chemistry, Andhra University, Visakhapatnam
530003, India.
b. Department of Inorganic & Physical Chemistry Division, Indian Institute of Chemical
Technology, Hyderabad 500007, India.
ABSTRACT
10 ppm EY dye were successfully photodegraded using visible light active 0.75wt% Ba & 0.25wt% Zr co-
doped TiO2 nanomaterial that were synthesized by Sol-gel method as nanomaterials under irradiation for 20
minutes and characterized by various advanced instrumental techniques. The X-ray Diffraction Spectroscopic
showed that the prepared nanomaterial were in the anatase phase with 2θ at 25.3º. UV-visible Diffuse
Reflectance Spectra analysis explained that the dopants found in the TiO2, imparts a significance absorption
shift towards visible region and their exisistance were confirmed by X-ray Photoelectron Spectral data.
Quantitatively the formation of hydroxyl radical by the nanomaterial in aqueous solution under visible
light irradiation was investigated by the photoluminiscent technique. Finally the effects of different parameters
in the photocatalytic degradation of EY were established in aqueous solution.
Key words: - Eosin yellow, EY, hydroxyl ion, photoluminiscent.
I. Introduction
Industrial uprising and the day to day human
activities have influenced on the flow, Storage and
the quality of available fresh water. Dyes are used
in food; textiles, beverage industries and printing
processes and throughout the processes huge
volumes of water consume by textile industries and
generate huge quantities of colored dye effluents
[1-3]. Natural streams and rivers are extremely
poisoned when untreated colored effluents
discharged to the water bodies that causes chemical
as well as biochemical changes and consumes
dissolved oxygen and destroy aquatic life [4–6].
Eosin Yellow is a heterocyclic dye containing
bromine atoms, specifically used in the fields of
dyeing, printing, leather, printing ink and
fluorescent pigment etc, because of its vivid color.
Coagulation/ flocculation, membrane separation
(ultra filtration, reverse osmosis) or absorption at
activated carbon, are mostly conventional
techniques, based on phase transfer mechanism of
the pollutant.
Colored dyes owing to their complex chemical
structures, they are resistant to biodegradation and
are hardly removed from effluents using
wastewater conventional treatments.
But advanced oxidation processes
(AOPs),using semiconductor/heterogeneous
photocatalysis appear as the most emerging
destructive technology with the possibility of using
sunlight as the source of irradiation to initiate the
demolition of organic pollutants [7]. Titanium
dioxide (TiO2) is the most widely used
photocatalyst which is a newly growing technology
and highly promising,cheap, stable, nontoxic, and
efficient free from secondary pollutants for serving
of environmental purification and best as well as
appropriate photocatalyst [8, 9]. It is known that
out of the incoming solar energy on the Earth’s
surface only 4% can be utilized by titania because
of the relatively high intrinsic band gap of anatase
TiO2 (3.2 eV), The main drawback associated with
its use is, the activated charge carriers before
reaching the surface to interact with adsorbed
molecules will undertake recombination leading to
low photoactivity of TiO2 within a nanosecond
after their generation. Avoiding of this limitation,
and to get better light absorption feature
RESEARCH ARTICLE OPEN ACCESS

characteristics and to extend the photocatalytic
carrier life time, to extend visible light response of
TiO2, doping and co-doping of metals, non metals
or metal & nonmetal found to be most suitable [10-
13]. Nitrogen-doped TiO2 was considered to be a
promising by reducing of the band gap making it
visible light active photocatalyst and metal dopants
facilitate the charge separation of e-/h and thus
decrease their rate of recombination [14].
Studies on Synthesis of a series of Zr & S co-
doped TiO2 (Zr-TiO2-S) prepared by a modified
Sol-gel method were also developed for
degradation of pollutants [15]. Studded on the
feasibility of a novel adsorbent composite
photocatalyst, poly (pyrrole-co-aniline)-coated
TiO2/nanocellulose composite (P (Py-co-An)-
TiO2/NCC), utilized to remove EY from aqueous
solutions [16]. Therefore to have powders of
homogenous concentrations synthesized at low
temperatures with high purity under stoichiometry
control Sol-gel method is helpful [17]. In view of
the significance of visible light responsive
photocatalyst, it is much honored to use a
photocatalyst with appropriate particle size, phase,
and other surface properties. Hence sol-gel method
has been followed for the preparation of barium
and zirconium co-doped TiO2 (Ba & Zr co-doped
TiO2) nanomaterial.
II. Synthesis of nanomaterial
photocatalyst.
A series of TiO2 samples were prepared by
co-doping with barium and zirconium in the range
of 0.25 –1.25 wt% and undoped TiO2 by sol-gel
method. For undoped TiO2 preparation, ethanol is
taken as solvent and added to titanium
tetrabutoxide (titanium precursor) for having
hydrolysis and condensation reactions in presence
of nitric acid with continuous string followed by
addition of ethanol and water drop wise after 30
minute. In case of co-doped catalyst preparation,
calculated quantities of barium nitrate and zirconyl
nitrate, (precursors of Ba and Zr,) respectively were
initially dissolved in water along with ethanol and
the resultant solution was added drop by drop from
the burette to the ethanol solution of Ti (OBu) 4
under vigorous stirring. After addition is over, the
colloidal suspension was allowed to stir for 60 min
and aged for 48 hrs in the drake. The formed gel
was dried in an oven at 100o
C. Afterward, it was
well pulverized before and after calcinations at
450o
C for 2 hrs in muffle furnace then cooled the
homogenous nano powder form.
III. Characterization of Photocatalyst.
XRD spectra were recorded for 2𝜃 from 20º to
80º with model Ultima IV, RIGAKU
diffractometer using monochromatized CuK𝛼
radiation (𝜆 = 1.541 Å) with a Germanium solid
state detector. The crystallite size of the
nanoparticles was calculated from sheerer equation,
XPS studies were done using PHI quantum ESCA
microprobe system model, using AlK𝛼 radiation of
250W X-ray tube as a radiation source with energy
of 1486.6 eV, 16mA ×12.5 kV under working
pressure lower than 1 ×10−8 Nm−2.The fitting of
the XPS curves was analyzed with multi pack 6.0A
software. UV-visible absorption spectra of the
samples were obtained by using Shimadzu 3600,
UVvisible NIR spectrophotometer using BaSO4 as
reference scatter. Photoluminescent spectral
analysis was done using Horiba Jobin Fluoro Max-
4 instrument with a PMT voltage of 150V and slit
set both at 2.5 nm.
IV. Photocatalytic activity of the nanomaterial
catalyst.
For the establishment of adsorption
desorption equilibrium on the nanomaterial catalyst
surface, a dye solution with catalyst was stirred in
dark for 20 min. The reaction mixture was
exposing to visible light source of 400W high
pressure mercury vapor lamp (Osram, India) by
placing it 20 cm away from light source. Aliquots
of samples were withdrawn at a certain regular time
intervals, through 0.45 𝜇m Millipore syringe filter.
The filtrate was analyzed on spectrophotometer at a
wavelength of 517 nm for (%) percentage
degradation studies of EY. To have a
comprehensive idea of the reaction environment it
is necessary to maintain the same for all the activity
tests. Percentage degradation of the dye was
calculated from the following equation:
% Degradation =[ (Ao-At) /Ao] x 100
Where 𝐴 𝑜 is initial absorbance of dye solution
before degradation and 𝐴𝑡 is absorbance of dye
solution at time 𝑡.

V. Results and Discussions
5.1 X-ray Diffraction Spectroscopic (XRD)
XRD patterns of Ba and Zr co-doped TiO2
nanaomaterial samples and undoped titania sample
were prepared by sol-gel method and calcined at
4500
C shows in Fig.5.1. All the samples are in
anatase phase (JCPDS No.: 21-1272) with
corresponding (1 0 1) plane at 2θ = 25.3º followed
by 2θ of 37.7º, 47.9º, 54.1º, 55º and represents the
planes (004), (200), (105), (211) anatase TiO2
respectively. Moreover, it was observed that, when
the dopent Ba2+
concentration increases from
0.25wt% to 0.5wt%, it was not observed any
respective peaks of barium oxide. After increasing
the concentration of Ba2+
as 0.75wt% and 1.0wt%,
it was observed which corresponds to the formation
of BaCO3 [10]. On the other side, there is also no
detectable dopant Zr4+
related peaks were observed.
Hence, the Zr4+
may be occupied substitutional sites
of the TiO2 crystal structure and it is more electro
positive than TiO2 which favors the formation of
less dense anatase phase [18]
5.2. Ultraviolet-Visible Diffuse Reflectance
Spectroscopic studies.
The UV-visible DRS spectrum of prepared
samples was shown in Fig.5.2. From the UV-
visible DRS studies the characteristic band for the
prepared samples was in the range of 380 to 500
nm, and the band gap energy (eV) for the selected
samples calculated using E=1240/λ (where as λ is
wavelength). The band gap of synthesized undoped
TiO2 was found to be 3.17 eV which is comparable
with the literature value. The co-doped samples
showed band gap ranging from 2.63 to 3.02 eV.
Hence lowering of the band gap, imparts the
absorbance shifted from ultraviolet to visible
region. Thus Red shift indicates more
photogenerated e-
/h+ pairs that could be excited by
photons with less energy, lead to better
photocatalytic efficiency in the visible region.
Thus, the results confirmed that all the synthesized
co-doped samples had reduced band gap and are
active in visible region.
5.3 Transmission electron microscope (TEM)
analysis
Tem image of 0.75 wt. % Ba and 0.25 wt. %
Zr co-doped TiO2 was represented in Fig.5. 3 and
average particle size was found to be 20.63nm. It is
in good agreement with the results of crystallite
size calculated by using the Scherer equation and
the full width at half maximum of the (101) peak in
the XRD patterns of the material. Ba & Zr co-
doping into TiO2 brings in decrease of the
crystallite size of TiO2 which leads to increase of
surface area of the catalyst, which is favorable
precondition for higher photocatalytic activity.
Based on XRD data and trail photocatalytic
activity studies, further characterization has been
made for Ba & Zr co-doped TiO2 nanomaterial
which showed best in trail photocatalytic
degradation activity studies.
5.4. X-Ray Photoelectron Spectroscopic (XPS)
Analysis.
XPS analysis of Ba & Zr co-doped
nanomaterial was carried out to authenticate the
presence of Ba and Zr and investigate their
chemical state. The high resolution XPS spectra of
Ba & Zr co-doped nanomaterial with elemental
analysis of Ti, O, Ba, and Zr were represented in
Figure 5.4. The co-doped Showed two peaks of
Zr3d5/2 and Zr 3d3/2 are absorbed with a binding
energy of 178.332 and 181.063 eV respectively,
this can be attributed to Zr4+
.From the above XPS
results a 3d peaks at 781.171 eV and 795.874 eV
corresponding to 3d5/2 and 3d3/2 respectively are
assigned as Ba2+
and does not absorbed into the
TiO2 being it is high atomic radii than Ti. The XPS
spectra of undoped TiO2 show spin orbit doublet
peaks of Ti 2p3/2 and 2p1/2 located at 459.0 and
464.7 eV which indicating the presence of Ti4+
in
the synthesized nanopowders [19,20]. Thus the
presence of Zirconium has certain influence on Ti4+
pulling the electrons in Ti–O–Ti bond, a bit away
from Ti atom, thus causing a little rise in Ti 2p3/2
binding energy.Thus XPS data has confirmed that
there is a substitutional doping of Zr in TiO2
network.
5.5. Photoluminescent Spectral Studies
The decisive reactive species during
photocatalytic reaction is formation of hydroxyl
radical which is a responsible for oxidative
decomposition of pollutants. To investigate the
production of ∙OH, one of the methods is
photoluminescence technique. Coumarone is used
as a fluorescent probe, which on reaction with ∙OH

results in the formation of 7-hydroxy coumarone
[21]. In this technique, 0.1g of catalyst is dispersed
in 10 ppm of coumarone 100 mL aqueous solution
in acidic conditions and exposed to visible light
radiation. For every 30 min 5 mL of the reaction
solution was token and filtered and
photoluminescent intensity was measured from 350
to 600 nm. The photoluminescent spectra of the
generated 7-hydroxy coumarone with maximum
absorption at 450 nm showed in Fig. 5.5.
Increasing of photoluminescent intensity was
observed linearly with increasing irradiation time
for first excitations. However, no maximum
absorption is observed for the sample in absence of
irradiation (0 min). Hence this indicates that, the
produced ∙OH at the catalyst surface was
proportional to the irradiation time. The results
further confirmed that,the selected synthesized
sample of Ba & Zr co-doped TiO2 nanomaterial
showed better rate of formation of ∙OH .
VI. Photocatalytic Degradation of EY.
Photocatalytic degradation of EY was
performed using the procedure given in Section
1.1. A blank test of the dye without photocatalyst is
also performed and there was no change of dye
concentration observed. The photocatalytic
performance depends on certain parameters, these
parameters are mainly focused on dopant
concentration, catalyst dosage, pH of solution and
initial dye concentration, and hence optimization of
these parameters must be necessary to be cost
effective.
6.1. Effect of Dopant Concentration.
Photocatalytic degradation studies of
synthesized different nanomaterial catalyst of
various dopant concentrations on EY are presented
in Fig. 6.1. All the co-doped samples showed
higher photocatalytic activity than that undoped
titania, under visible light irradiation. So, it is a
manifest to say that co-doping enhances the
photocatalytic performance of TiO2. Among all the
co-doped nanomaterials 0.75wt% Ba & 0.25wt%
Zr co-doped TiO2 showed better percentage of
photocatalytic degradation.
Regarding to the above analysis, the optimal
Ba and Zr content is so small hence with over
dosage of dopant content in TiO2, the number of e-
/h+ recombination centers will increase which
accompanied with low photocatalytic activity.
6.2. Effect of pH solution
Fig.6.2. Represents the percentage
degradation of EY as function of time at different
pH values. A nanomaterial exhibiting best
photocatalytic performance of 0.75wt% Ba &
0.25wt% Zr co-doped TiO2 was selected and
experiments were conducted for finding the
optimum pH at constant dye concentration of 10
ppm and catalyst dose of 0.1g. As we have
observed from the figure photo degradation of this
anionic dye was faster at pH 2.
During photocatalytic degradation,
electrostatic interactions among a semiconductor
surface, substrate, and charged radicals strongly
depend on the pH of the solution. At lower pH
environment, positive charge on TiO2 surface
increases which enhances the adsorption of dye
molecules on the surface of catalyst, in addition to
minimizes the e-/h+ recombination. But at higher
pH TiO2 surface develops negative charges that
occurs repulsion with a dye molecule that imparts
in low adsorption of molecule leading to low
degradation efficiency.
6.3. Effect of Catalyst Dosage
An optimum catalyst concentration must be
decided in order to avoid wastage of catalysts and
ensure the total absorption of
photons.Photocatalytic degradation was carried out
upon using varying dosage from 0.25-0.3g of the
selected co-doped TiO2 nanaomaterial at pH 2 is
represented in fig. 6.3 Linear increase rate of
degradation observed with increase in amount of
catalyst up to 0.2g.
The number of photons absorbed by the
catalyst is high as of the catalyst dosage is
increase, which in turn increases the generation of
electrons and holes and thus increases the number
of hydroxyl radicals. Hence it absorbs also more
dye molecules. However, beyond 0.2g of catalyst
dosage, photocatalytic activity decreased due to the
turbidity, restriction of light penetration that acts as
blanket. Since high catalyst dosage significantly
affects the degradation

6.4. Effect of Initial Concentration of Dye.
To decide the optimum initial dye
concentration at a fixed catalyst dosage and pH,
experiments were conducted with different dye
concentrations of 5, 10, 15, and 20 ppm and results
are represented in Fig. 6.4.
The optimum initial concentration of dye
was found to be 10 ppm and further increase in dye
concentration decreased the rate of degradation.
For this reason as the dye concentration increases,
the corresponding ratio of reactive species (∙OH)
may not be formed at the fixed catalyst dosage.
Restriction of surface active sites for the catalytic
reaction may also control the degradation of EY.
6.5. Mechanism in formation of ∙𝑂𝐻 (hydroxyl radical).
Visible light + Catalyst Catalyst (h+
+ e-
)
h+
+ H2O H+
+ OH-
h+
+ -
OH •OH
e- + O2 •O2
-
e- + •O2
-
+ H2O HO2
•
+ -
OH
e- + HO2
•
+ H+
H2O2
e- + H2O2 •OH + -
OH
VII. Conclusion
Barium and zirconium were effectively co-
doped TiO2 and its photocatalytic activity was
studied for the degradation of EY under visible
light. All the synthesized samples were in anatase
phase and band-gap has been reduced. Co-doping
improved the trapping of electrons inhibiting e-
/h+
recombination during photocatalytic process.
Among all the synthesized catalysts 0.75wt.% Ba
and 0.25wt.% Zr co-doped TiO2 nanomaterial
exhibited excellent photocatalytic activity under
visible light due to large shift in band gap, high
crystalline anatase phase, and effective separation
of electrons and holes. 100% degradation of EY
with initial concentration of 10 ppm was achieved
in 20 min at pH 2 with catalyst dosage of 0.1g.The
experimental results revealed that eosin yellow can
be effectively degraded by Ba & Zr co-doped TiO2
nanomaterial.
VIII. Acknowledgments
Thankful to University of Gondar
(UOG) Ethiopia, Government of the Federal
Democratic Republic of Ethiopia for their giving
me a chance to pursue phD, My Research Guide
Prof.T.siva Rao for his unlimited help and
encouraging me. Advanced Analytical Laboratory,
DST-PURSE Programme, and Andhra University
for their support in carrying out in this research
work regarding SEM-EDX, FT-IR, XRD analysis.
Prof. Sreedhar Boja (IICT- Hydra bad (India) for
their unlimited support in carrying out in this
research work regarding characterization of
nanomaterials using advanced instruments such as
TEM, XPS, UV-visible DRS ,BET and XRD.
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Table 1. Shows crystallite size, Band gap and BET surface area of the prepared co-doped and Undoped
nanomaterials.
Catalyst Crystallite size Band gap
0.75wt% Ba & 0.25wt% Zr-TiO2 20.15 nm 2.689 eV
Undoped 36.55 nm 3.17 eV
10 20 30 40 50 60 70 80 90
0
50
100
150
200
250
300
Intensity(a.u)
2Theta(2Q)
(1)
(2)
Fig. 5.1. XRD pattern of the synthesized undoped and 0.75wt% of Ba2+
& 0.25 wt% Zr4+
co -doped TiO2
300 400 500 600 700 800
(Absorbance(a.u))
Wavelength(nm)
a) Undoped
b) 0.75 wt% Ba & 0.25 wt% Zr
a
b
Fig.5.2. The UV-vis-DRS spectra of, undoped and co-doped TiO2 0.75 wt.% of Ba2+
and 0.25wt% Zr4+
.

Fig.5.3. TEM images of (a) undoped (b) 0.75 wt% Ba & 0.25wt% Zr co-doped TiO2 nanomaterial.
Fig.5.4. (a) XPS survey spectrum of co-doped TiO2 (b) high resolution spectrum of C1s (c) Ba 3d (d) O1s
(e) Zr 3d and (f) Ti 2p, respectively.
435 440 445 450 455 460 465
120 min.
90 min.
60 min.
30 min.
0 min.
PLIntensity(a.u)
Wavelength (nm)
Fig.5.5. PL Photolumincesnce spectra of Ba & Zr co-doped showing the release of hydroxyl radicals when
irradiated to visible light and the rate of release is very fast in the first few minutes.

0 10 20 30 40 50 60
0
20
40
60
80
100
Degradation(%)
Time (min.)
(5)
(6)
(3)
(2)
(4)
(7)
(1)
(8)
1. 1wt% Ba & 0.25wt% Zr –TiO2
2. 0.25wt% Ba & 1wt% Zr –TiO2
3. 0.5wt% Ba & 0.5wt% Zr –TiO2
4. 0.25wt% Ba & 0.75 Zr wt% Zr- TiO2
5. 0.75wt% Ba & 0.25 wt% Zr - TiO2
6. 0.5wt% Ba & 1wt% Zr – TiO2
7. 1wt% Ba & 0.5wt% Zr – TiO2
8. Undoped TiO2
.Fig. 6.1. Effect of dopant concentration of co-doped titiania on the % degradation of EY. Here the nanomaterial
catalyst dosage 0.1g, pH 10 & EY 10 ppm.
0 10 20 30 40 50 60
0
20
40
60
80
100
Degradation(%)
Time (min.)
(pH2)
(pH3)
(pH4)
(pH5)
(pH8
Fig.6.2. The effect of pH on the % degradation of EY by Ba & Zr co-doped TiO2. Here, catalyst dosage = 0.1g
and EY = 10 ppm.

0 10 20 30 40 50 60
0
20
40
60
80
100
Degradation(%)
Time (min.)
(0.1gm)
(0.05gm)
(0.025gm)
(0.2gm)
(0.3gm)
Fig. 6.3. Effect of catalyst dosage on the % degradation of EY by 0.75 wt% Ba & 0.25 wt% Zr co- doped
TiO2 nanomaterial. Here, pH=10 and EY =10 ppm.
0 10 20 30 40 50 60
0
20
40
60
80
100
Degradation(%)
Time (min.)
(10ppm)
(5ppm)
(15ppm)
(20ppm)
Fig.6.4. The effect of initial concentration of dye on the % degradation of EY. Here pH = 2, catalyst dosage =
0.1g.

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