This study addresses a significant environmental issue by
exploring an efficient method for removing organic pollutants from wastewater,
which is crucial for mitigating water pollution. The study's findings
contribute to the development of advanced photocatalytic materials and
techniques, offering potential solutions for wastewater treatment and
environmental remediation. Calcium-doped lanthanum manganiteLa0.75Ca0.25MnO3
having a Perovskite structure shows a high degree of catalytic efficiency for
the removal of organic pollutants (Methylene Blue dye) from its aqueous
solution. Organic dyes in wastewater are effective environmental pollutants,
the removal of which is a challenging issue. Photocatalytic degradation of such
dyes on the surface of metal oxides has been intensively studied and it is
found that semiconductor-mediated heterogeneous catalysts are promising
candidates to degrade a wide range of organic pollutants. The sample
powder(LCMO) has been prepared through the sol-gel technique and characterized
by X-Ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR),
Inductively Coupled Plasma-Atomic-Emission Spectroscopy (ICP-AES), Scanning
Electron Microscopy (SEM), Energy Dispersive X-ray spectroscopy (EDX) and
UV-VIS spectroscopy. The XRD data showed the formation of a single crystalline
phase. SEM images showed that the micro-sized LCMO sample had a nanocrystalline
structure with an average diameter of 1-5 µm. The ICP-AES and EDX data
confirmed the formation of the required stoichiometric La1-xCaxMnO3 Oxide.
Calcium doping resulted in the reduction of band gap energy(Eg) of the
perovskite whose catalytic performance towards photodegradation of Methylene
Blue(MB) dye(5 ppm) was evaluated over
visible light irradiation at constant dose for several hours at pH value 4. The
result showed the photocatalytic efficiency of La0.75Ca0.25MnO3 nanocomposite
(0.07 g l-1) was 68.52 % of the initial dye concentration within 100 min
illumination time. The linear increase in the rate of photodegradation was
found in our sample as a function of irradiation time with a reaction rate of
1.582 x10-3 min-1. The activated electron in the conduction band also responds
with an oxygen molecule that is adsorbed on the outer layer of the
photocatalyst to form a superoxide radical. These findings showed convincingly
that La1-xCaxMnO3 photocatalyst possessed great promise for
visible-light-driven photodegradation of MB dye and signifies the effective
material for environmental pollution remediation and water treatment technologies.
The reproducibility of the sample for degradation was studied.
Author(s)details:-
Himansulal Nayak
Department of Chemistry, College of Basic Science and Humanities, Orissa
University of Agriculture and Technology, Bhubaneswar 751003, Odisha, India.
Biswajit Padhi
Department of Chemistry, College of Basic Science and Humanities, Orissa
University of Agriculture and Technology, Bhubaneswar 751003, Odisha, India.
Please See the book
here :- https://doi.org/10.9734/bpi/cmsdi/v1/8567E
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