Browsing by Author "Pranshu Kumar Gupta"

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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
Metal Nanocomposites as Optical Sensor for Ions and Molecules of Environmental Concern
(Springer Nature, 2022) Pranshu Kumar Gupta; Pawan Kumar Sada; Vikas Kumar Sonu; Abhishek Rai
Multi phasic metal nanocomposites comprising a zero-dimensional metal nanoparticles phase (0.5–5% w/w) have significantly enhanced the material property and sensing ability of easily recoverable conventional matrices like glass, ceramics, metal, carbon allotropes or polymers. Over the past few years, promising chemical and physical properties of metal nanocomposites, developed via direct in situ chemical, photocatalytic, or thermal reduction of metal salts, over common matrix, or ex situ direct insertion of nanoparticles into the polymer. Colorimetric MNC sensors like metal–metal oxide NPs, quantum dots have depicted a relation between their type, structure, function and sensing performance, via aggregation/decomposition of NPs, fluorescence on/off and ligand-receptor interaction. Functional single/multilayered transition-metal dichalcogenides have been employed both, as a matrix for their decoration exhibiting synergism and quite recently as nanocomposites exhibiting ultra-fast and selective multi-sensor activity over narrow detection limits that are an urgent demand of national, homeland and environment safety. Fabrication of these biosensors endorse their progress in environmental and material aspects. They are employed as bio-analytic sensors against excess of heavy metal ions, nitro-compounds, poly-aromatic hydrocarbons, microbial proteins etc. imparting exclusive photo-chromatic and electronic properties, tuned at grass-root level by adjusting various supramolecular interactions and also the metal-ligands interactions at molecular level. Nanocomposites have several applications mainly in biological arenas, solar cells, communication field, optoelectronic devices etc. In this chapter we would discuss about recently developed nanocomposite-sensors, their synthesis, mechanism for their sensing action and environmental application involving mainly optical sensors. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Synthesis of fluorescent carbon dots using bio-waste powder for photo-degradation of dyes: simulation and mechanistic study
(Royal Society of Chemistry, 2024) Pranshu Kumar Gupta; Kalluri V. S. Ranganath
Biowaste-derived carbon quantum dots (CQDs) offer a wide range of applications, including bioimaging, drug degradation and manufacturing of sensors, photodetectors and photosensitisers. However, inaccurate measurements of their quantum confinement and valence/conduction band potentials complicate their application predictability. Herein, we report carbon dots synthesized hydrothermally (600 °C; 6 h) using sugarcane bagasse powder (SC-CQDs). These SC-CQDs were characterized through UV-visible, fluorescence, PXRD, XPS, DLS, FTIR, Raman, SEM, EDAX and TEM analyses. The obtained SC-CQDs resemble amorphous N-doped multilayer-nanographene-type spherical particles with a size of 9.09 nm and has a band gap of 2.46 eV (λabs: 298 nm) with -COOH/-OH functionalities. The quantum confinement and valence/conduction band potentials were estimated using Brus-Kayanuma quantum mechanical (BKQM) and virtual molecular dynamics (VMD) equations. These CQDs are potential candidates for sunlight-mediated methylene blue degradation in water within 36 min for up to four catalytic cycles. © 2024 The Royal Society of Chemistry.