Interpretation of adsorption behavior of carboxymethyl cellulose onto functionalized accurel polymeric surface

Singh, K and Kumar, A and Pandey, SK and Awasthi, S and Gupta, SP and Mishra, P (2020) Interpretation of adsorption behavior of carboxymethyl cellulose onto functionalized accurel polymeric surface. In: Industrial and Engineering Chemistry Research . (In Press)

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Abstract

Carboxymethyl cellulose (CMC) is the most versatile cellulose derivative having several industrial applications such as mineral processing, pelletization process, oil drilling, surface modifications, functionalization of materials, and other promising utilizations. However, the less interpretation of the adsorption behavior of CMC onto the functionalized polymeric surface in its aqueous medium hinders its applications. The present contribution has, therefore, been made to explore the binding aspects of CMC onto functionalized accurel (FA) derived from polypropylene-based Accurel (MP1001). The physiochemical parameters of FA such as specific surface area (SBET) = 34.472 m2/g, pore volume (Vp) = 0.07-0.121 cm3/g, total pore volume (Vtp) = 0.115 cm3/g, mean pore diameter = 13.692 nm, and pore diameter = 39.402 nm were determined by the Brunauer-Emmett-Teller (BET) analysis. The batch shaking adsorption experiments with various parameters were conducted, and the equilibrium isotherm data were fitted with the Freundlich, Langmuir, Temkin, and Jovanovic models of adsorption and compared by determination coefficient (R2), which followed the order: Langmuir (R2 = 0.9933) > Freundlich (R2 = 0.9830) > Jovanovic (R2 = 0.9428) > Temkin (R2 = 0.8663). The infrared and X-ray photoelectron spectral changes before and after adsorption were recorded, which confirmed the hydrogen bonding between the carbonyl group of CMC and functional groups (-OH) of FA in the regions 288-280 eV and 1772-1676 cm-1, respectively. To understand the type, nature, and strength of interaction(s) involved in the adsorbent-adsorbate complex (FA-CMC), a theoretical model is adopted in this report. With the deployment of the density functional theory (DFT) dispersion-corrected (DFT-D) and DFT approaches, geometric stability and electronic feature analyses have been performed using the optimized structure, binding/interaction energy, highest unoccupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gap, natural population analyses, and Bader's quantum theory of atoms in molecules (QTAIM)-based parameters. The reactive sites of the aforementioned species have been detected using the molecular electrostatic potential surface (MESP) map. The exhibition of different geometrical and electronic features including the binding aspects of the adsorbate CMC onto the polymeric surface of the adsorbent FA was exercised via CMC accumulation stabilized by Hbonding and other weak noncovalent interactions and since such alteration could play a noteworthy role in the fields of food, pharmaceutical, and industrial chemistry. © 2020 American Chemical Society. All rights reserved.

Item Type:	Journal Article
Publication:	Industrial and Engineering Chemistry Research
Publisher:	American Chemical Society
Additional Information:	Copyright to this article belongs to American Chemical Society
Keywords:	Binding energy; Cellulose; Density functional theory; Hydrogen bonds; Ions; Molecular orbitals; Oils and fats; Polypropylenes; Quantum theory, Brunauer emmett tellers; Determination coefficients; Lowest unoccupied molecular orbital; Molecular electrostatic potentials; Natural population analysis; Non-covalent interaction; Physiochemical parameters; Quantum Theory of Atoms in Molecules, Adsorption
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	11 Dec 2020 07:50
Last Modified:	11 Dec 2020 07:50
URI:	http://eprints.iisc.ac.in/id/eprint/67239

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