Browsing by Author "Manisha Pandey"

Now showing 1 - 9 of 9

Biobased Polyimine Vitrimers: Promising Materials for Fluorescence Quenching, Anticounterfeiting, and Plastic Degradation
(American Chemical Society, 2025) Akanksha Rai; Manisha Pandey; Shikha Tripathi; Avanish Singh Parmar; Kalluri Venkata Sri Ranganath
Using glucose, one of the readily available biomasses provides an industrially relevant derivative 5-hydroxymethyl furfural (5-HMF) containing two versatile functionalities. 2,5-Furandicarbaldehyde (DFF) has been synthesized in high yields via chemo-selective oxidation of 5-HMF. Biobased thermoset vitrimers were prepared by the condensation of DFF with various amines such as polyethylenimine, Bis[4-(4-aminophenoxy)-phenyl] propane (BAPP), 1,4-diaminobutane, and (l)-Lysine. This paper reports the design, synthesis, and characterization of fluorescent biobased vitrimers and poly imines for sensing of various aromatic monoamines, diamines, and also Pd metal. It was further demonstrated that biobased polyimine vitrimers are apt as anticounterfeiting material, for plastic degradation, and for synthesis of nanoparticles in an effective way. The fluorescent material offered good thermal stability and obeyed the property of pseudoplasticity having Non-Newtonian fluids. © 2025 The Authors. Published by American Chemical Society.
Borophene-graphene oxide: synthesis, characterization and catalytic application
(Royal Society of Chemistry, 2025) Manisha Pandey; Nisha Mathur; Kalluri Venkata Sri Ranganath
We report the synthesis and physical investigation of a borophene-graphene oxide composite material. The synthesis of borophene was carried out by the liquid-phase exfoliation of boron powder, while graphene oxide was synthesized by the Hummers’ method from graphite. Finally, the composite material borophene-graphene oxide (B-GO) was obtained using a thermal method. The loss of defective sites and creation of new defective sites were confirmed by Raman spectroscopy. According to the DTA and Raman analysis, the oxidation of borophene to either B2O3 or BCO2 was hindered by GO in B-GO. Further, the roughness of B-GO (2.18 nm) was found to be higher than that of GO (1.79 nm) based on atomic force microscopy (AFM). The significant change in the functional groups of GO and the formation of B2O3 during the synthesis of B-GO were explained using XPS spectroscopy. Further, morphological studies of GO and B-GO were carried out using SEM and TEM analysis. The catalytic efficiency of the prepared materials was evaluated in the hydrogenation of esters of fatty acids (biodiesel), and B-GO exhibited better catalytic activity than the parent materials of borophene and GO. Remarkably, the ID/IG ratio increased significantly in B-GO (from 0.79 to 1) and it decreased in pure GO (from 0.83 to 0.70) after the recyclability test. © 2025 The Royal Society of Chemistry.
Carbon Nanoparticles Entrapped triclinic Iron Vanadate: A Promising Material for the Synthesis of Diformylfuran.
(John Wiley and Sons Inc, 2023) Rama Jaiswal; Manisha Pandey; Kiran Kumar Atyam; Kalluri V. S. Ranganath
Developing sustainable, inexpensive material has been proposed as a promising catalyst. Herein, we report the synthesis of new hybrid material composed of carbon nanoparticles entrapped in iron vanadate. Thus obtained new material was characterized using SEM, PXRD, Raman and XPS.The catalytic potentiality of CNP/FeVO4 has been tested in the oxidation of biomass derived hydroxymethylfurfural (HMF) in an aqueous medium. An enhanced conversion of 5-HMF to diformylfuran (DFF) is observed in the presence of CNP/FeVO4 than FeVO4 alone. The absence of expensive metals and using only water as a solvent, along with recyclability of catalyst make our catalytic method green and attractive. © 2023 Wiley-VCH Verlag GmbH.
Chiral Heterogeneous Polymer for the Separation of Naproxen Enantiomers
(American Chemical Society, 2025) Pranshu Kumar Gupta; Neeraj Kumar; Akanksha Rai; Manisha Pandey; Kalluri Venkata Sri Ranganath
Chiral organic heterogeneous polymer materials have a wide range of applications, including asymmetric catalysis, enantiospecific recognition, and the resolution of enantiopure compounds. Those chiral polymers self-assemble into various shapes and sizes, allowing them to tune their activity and enantioselectivity. In this study, we report the synthesis of chiral alkaloid dinaccamate polymers separated by different spacers. The prepared materials exhibited a porous, wirelike morphology with a width of ∼230 nm and a pore diameter of ∼17 Å. The chiral materials provided the highest resolution of racemic naproxen into pure enantiomers (selectivity factor ∼ 1.87) in 180.0 min, isolating approximately 99% of each enantiomer. A typical open-tubular chiral polymer on the Al2O3 column being continuously eluted by hexane/ethanol [1:1 (v/v)] at a flow rate of 0.66 mL min–1 afforded appreciable resolution (R ∼ 2.01) with retention times of 26.98 min (R) and 40.01 min (S) for 10 resolution cycles. © 2025 American Chemical Society
Chiral Modification of Ferrite Nanoparticles for Oxidative Kinetic Resolution of Benzoins
(John Wiley and Sons Inc, 2023) Pranshu K. Gupta; Neeraj Kumar; Abir B. Majumder; Manisha Pandey; Vasu Goverdhan R. P; Kalluri V. S. Ranganath
We report the surface modification of ferrite nanoparticles (MFe2O4 NPs; M= Mn, Fe, Co, Ni, Cu, Zn) with chiral surfactants derived from cinchona alkaloids. The successful synthesis of chiral ferrites were characterized using powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), Atomic force microscopy (AFM), Thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM). These chiral materials were highly active in the oxidative kinetic resolution (OKR) of racemic benzoins. Remarkably gemini surfactant modified Fe3O4 NPs were found to be a potential candidate in the OKR and (R)-benzoin was isolated with 97% enantiomeric excess (ee). The sustainability of our catalyst has been demonstrated in the gram scale synthesis of (R)-furoin (93% ee). The recyclability studies have also been performed and found that it could be recyclable with decrease in ee. © 2023 Wiley-VCH GmbH.
High Performance Polyhexahydrotriazine (PHT) Thermoset for the Synthesis of Furanics
(Springer, 2023) Akanksha Rai; Rama Jaiswal; Manisha Pandey; Kalluri V. S. Ranganath
Highly active, environmental friendly thermosets, polyhexahydrotriazines (PHTs) were prepared through the condensation of aromatic diamines and paraformaldehyde. The sulfonic acid-derived PHT possesses that both Brønsted base and acidic sites have been realized as a potential material in the dehydration of biomass (glucose/fructose) to 5-hydroxymethylfurfural (HMF) at low temperature. This thermoset is degradable at high temperatures (> 80 °C) in the presence of aqueous solution of glucose/fructose with the generation of oxidized products of HMF and consequently produced furan-amine adducts. Moreover, the highly active PHT can be separated at lower temperatures (< 80 °C) with recyclability and found that its activity is declining after each cycle. This thermoset material can be used as an alternative to plastic material which is not degradable even thermally. In addition, PHTs were characterized successfully by various techniques such as PXRD, FT-IR, SEM, BET, and TGA analysis. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
Hydrogenation of biomass-derived fatty acid esters and Dunaliella salina catalyzed by Pd on V2O5
(Springer Science and Business Media Deutschland GmbH, 2025) Manisha Pandey; Akanksha Rai; Nitesh Prasad; Abhishek Mohanta; Ravi Kumar Asthana; Kalluri Venkata Sri Ranganath
The hydrogenation of methyl oleate (C18:1) over vanadium-supported Pd was studied in the liquid phase under hydrogen pressure (1.0 atm). The hydrogenated product methyl stearate (C18:0) was obtained in good yields which are well-known precursors for the synthesis of long-chain alkanes (jet fuels). The catalytic activity of Pd/V2O5 is independent of the nature of the alkyl chain, the presence of a number of double bonds, and the source of fatty acids of methyl esters. The potentiality of Pd/V2O5 catalyst has been also studied in the hydrogenation of poly-unsaturated fatty acid esters from methyl linoleate, micro alga, soybean oil, and olive oil resulting in complete hydrogenation without effecting ester groups in excellent yields. During the process of hydrogenation of methyl oleate, isomerization of cis–trans was negligible, (1.56% of cis–trans) even at 70 ℃ in hexane. Both oxidation states of support vanadium (V5+, V4+) and noble metals Pd2+ and Pd0 play a key role in this reaction under heterogeneous conditions. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.
Surface-modified NiFe2O4 nanoparticles for the production of biodiesel from fatty acids and microalgae lipids Dunaliella salina
(John Wiley and Sons Ltd, 2024) Manisha Pandey; Neeraj Kumar; Nitesh Prasad; Ravi Kumar Asthana; Kalluri V. S. Ranganath
Development of a new and sustainable catalyst is necessary to the society for providing economical technology. Surface modification of nanometal oxides is one of the rapidly growing methods for developing a sustainable catalyst with attractive properties than their parent oxide. In this work, surface-modified nickel ferrites have been carried out using 4,4′-biphenyldisulfonic acid (BPDSA) as the linker. Thus, obtained modified material has been characterized using different techniques such as DLS, FT-IR, TGA, XRD, VSM, and XPS. This well-characterized, stable, robust, recyclable material offers a good conversion in the fatty acid, that is, oleic acid esterification in the presence of methanol in a short period of time (3.0 h). Based on the kinetic study in the oleic acid esterification, it fits in the pseudo first-order kinetics, and activation energy was found to be 60.0 kJ/mol. Further, the potentiality of our catalyst was also tested in the transesterification of various raw materials like mustard oil, olive oil, almond oil, and neem oil. In addition, it provides an excellent conversion with microalgae lipid extraction for the production of biodiesel. The kinematic viscosity of the methyl oleate (biodiesel) has been found to be 5.0426 mm2/s at 25°C whereas the dynamic viscosity is 6.0511 mPa, which is nearly the same as biodiesel obtained from Dunaliella salina, microalgae lipid. © 2024 John Wiley & Sons Ltd.
Synthesis of value-added furan compounds from biomass derived glucose via cascade catalysis using functionalized V2O5 catalysts
(Elsevier B.V., 2022) Manisha Pandey; Pranshu K. Gupta; Rama Jaiswal; Kalluri V.S. Ranganath
In this paper we report the highly active, versatile and stable catalyst has been prepared through surface functionalization of vanadium oxide nanoparticles (V2O5 NPs) using various organic modifiers. The surface modified catalyst forms fiber type of structure has been evaluated in the cascade catalysis of glucose to 2,5-diformyl furan (DFF) in water. Further, nitro alcohol product (1,1′-(furan-2,5-diyl)bis(2-nitroethan-1-ol) was synthesized by adding nitromethane and potassium carbonate to DFF formed (in situ) from biomass. This is a new representative of work using heterogeneous catalysis utilizing surface modified NPs. High thermal stability, high crystallinity with a band gap (5.03 eV) and fibrous nature makes the surface modified catalyst attractive to recycle in DFF synthesis from glucose. In addition, orthorhombic V2O5NPs have been deposited on high surface area carbon (Vulcan XC72R) were prepared, characterized and studied in catalysis of biomass conversion. © 2022 Elsevier B.V.