Evaluation of synthesized ferrite nanocomposites with N-doped graphene and carbon microspheres for the removal of heavy metals and organic pollutants
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
Magnetic ferrites and their nanocomposites with nitrogen doped graphene oxide (N-GO) and
hollow mesoporous silica have received immense interest as adsorbents and photocatalysts for
water decontamination. This work reports facile strategy for the synthesis and evaluation of
N-GO, MFe2O4 NPs (M= Mg, Ca), MFe2O4-NGO (M= Mg, Ca) and hollow
mesoporousnanocomposites for the removal of Pb(II), Ni(II), As(III), CR dye and PNP from
contaminated water.NCs of NGO with MFe2O4 NPs were prepared using ultra sonication
method. For dual core shell nanocomposite, hollow mesoporous SiO2 core was synthesized
using polyethylene glycol (PEG) and cetyltrimethyl ammonium bromide (CTAB) as cotemplates.
Synthesized SiO2 was used as template over which MgFe2O4 NPs were loaded
using sodium dodecyl sulphate (SDS) as a surfactant to synthesize MgFe2O4@SiO2 core-shell
nanocomposite. This nanocomposite was further loaded with N-GO in order to design
NGO@MgFe2O4@SiO2 dual core nanocomposite by ultra sonication method. Structural,
magnetic and surface properties of the nanocomposites were analyzed using various
physicochemical techniques. The effectiveness of NPs and nanocomposites for the removal of
Pb(II), Ni(II) and As(III) and photodegradation of CR and PNP was studied.MgFe2O4@SiO2
displayed maximum heavy metal removal whereas, NGO@MgFe2O4@SiO2 dual
corenanocomposite exhibited maximum photocatalytic degradation for organic pollutants.
The mechanism of adsorption and photocatalysis from spiked water was investigated by batch
experiment studies.The adsorption data was best fitted into Langmuir adsorption isotherm and
followed pseudo-second-order kinetic model.The degradation mechanism for CR and PNP
was proposed on the basis of mass spectrometric analysis of products formed during
photodegradation. Also, the comparative photocatalytic activity of spiked distilled water and
contaminated water revealed reduction in photocatalysis of 17% and 22% in the contaminated
water. The synthesis of NCs of MgFe2O4 NPs with doped carbon material and core-shell
synthesis using SiO2 core provide new synthetic strategy for further modification of pristine
ferrite NPs for future applications.
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Manmeet Kaur (2021). Evaluation of synthesized ferrite nanocomposites with N-doped graphene and carbon microspheres for the removal of heavy metals and organic pollutants (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.