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20202
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Subject: Chemistry × Author: Pandey, Komal × Start date: 2018 × Type: Thesis ×
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    Magnesium ferrite and Graphene quantum dots nanocomposite for catalytic application
    (Punjab Agricultural University, Ludhiana, 2020) Pandey, Komal
    Herein, a novel strategy has been proposed to fabricate graphene quantum dots (GQDs) deposited magnesium ferrite nanoparticles (MgFe2O4 NPs) nanocomposite for paranitrophenol (PNP) degradation and reduction activity. GQDs are deposited over MgFe2O4 through a cothermolysis method. The structural, morphological, and optical properties of the prepared MgFe2O4 – GQDs nanocomposite were characterized by analytical techniques such as X-ray diffraction, Fourier-transform infrared spectroscopy, transmission electron microscopy, Brunauer Emmit Teller (BET) surface area analysis, Vibrating sample magnetometer, and UV- visible spectrophotometry. The photodegradation and reduction capability of the nanocomposite has been demonstrated by comparison with MgFe2O4 NPs. The catalytic activities of the nanocomposite and MgFe2O4 were evaluated in terms of photodegradation and reduction of PNP in aqueous solution. The greater catalytic activity is attributed to the extended conjugation of GQDs along with the large photo-induced charge separation through the transfer of photo-generated electrons from MgFe2O4 to GQDs. The light upconversion properties of uniformly deposited graphene quantum dots could also be a reason for the higher visible light catalytic activity of the synthesized magnetically recoverable hybrid photocatalyst. Overall, the present approach adheres to green chemistry principles and the nanocomposite holds promise for the development of remarkably efficient catalytic systems.
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    Magnesium ferrite and Graphene quantum dots nanocomposite for catalytic application
    (Punjab Agricultural University, Ludhiana, 2020) Pandey, Komal; Manpreet Kaur
    Herein, a novel strategy has been proposed to fabricate graphene quantum dots (GQDs) deposited magnesium ferrite nanoparticles (MgFe2O4 NPs) nanocomposite for paranitrophenol (PNP) degradation and reduction activity. GQDs are deposited over MgFe2O4 through a cothermolysis method. The structural, morphological, and optical properties of the prepared MgFe2O4 – GQDs nanocomposite were characterized by analytical techniques such as X-ray diffraction, Fourier-transform infrared spectroscopy, transmission electron microscopy, Brunauer Emmit Teller (BET) surface area analysis, Vibrating sample magnetometer, and UV- visible spectrophotometry. The photodegradation and reduction capability of the nanocomposite has been demonstrated by comparison with MgFe2O4 NPs. The catalytic activities of the nanocomposite and MgFe2O4 were evaluated in terms of photodegradation and reduction of PNP in aqueous solution. The greater catalytic activity is attributed to the extended conjugation of GQDs along with the large photo-induced charge separation through the transfer of photo-generated electrons from MgFe2O4 to GQDs. The light upconversion properties of uniformly deposited graphene quantum dots could also be a reason for the higher visible light catalytic activity of the synthesized magnetically recoverable hybrid photocatalyst. Overall, the present approach adheres to green chemistry principles and the nanocomposite holds promise for the development of remarkably efficient catalytic systems.