Polysaccharide-based materials and their adsorption properties in aqueous solution

Dehabadi, Leila; Wilson, Lee D.

doi:10.1016/j.carbpol.2014.06.083

Cited by 60 publications

(89 citation statements)

References 30 publications

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“…The estimated SA of the starch biopolymers exceed that of cellulose, in agreement with the uptake capacity, however; the BET SA estimates obtained from N 2 isotherms are systematically lower (10 0 to 10 1 m 2 /g) [25]. The offset in uptake values by these two different gas systems may relate to the role of dipolar versus van der Waals interactions for water vapour and nitrogen gas.…”

Section: Water Vapour Adsorption Isothermssupporting

confidence: 61%

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Vapour and Solution Uptake Properties of Starch and Cellulose Biopolymers

Dehabadi¹,

Shakouri²,

Simonson³

et al. 2018

GEP

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This study was aimed at gaining further insight on the role of hydration in adsorption processes of biopolymer/adsorbate systems using complementary methods (electromagnetic interference (EMI) shielding, calorimetry, and solvent/vapour adsorption isotherms). Cellulose and starch-based materials were used as the adsorbents, whereas water (liquid and vapour), ethanol and p-nitrophenol (PNP) in aqueous solution were the adsorbate systems. The biopolymer/water systems had higher uptake capacity overall, where starch materials showed higher uptake capacity than cellulose among the various solvents. The secondary and tertiary structure of the biopolymers was a key factor affecting their uptake capacity, as evidenced by the enhanced adsorption properties of starch over cellulose, along with higher uptake of amylose (AM) versus amylopectin (AP) in starch biopolymers. EMI results also confirmed that AM starch had higher adsorption toward water than ethanol. The textural properties and surface chemistry of the biopolymers were probed using dye adsorption (PNP at pH 8.5) in aqueous solution that showed parallel trends with water vapour adsorption isotherms. Isothermal Titration Calorimetry (ITC) revealed that the heat of adsorption in AP differed from that of AM since the biopolymer tertiary structure governs the accessibility of biopolymer adsorption sites. The role of branching in AP and amorphous domains in AM/AP composites are inferred to play a key role in hydration-driven allosterism known for such biopolymer/water vapour adsorption processes.

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Section: Water Vapour Adsorption Isothermssupporting

confidence: 61%

“…In addition, the completion of the monolayer saturation profile takes place at a low for the same materials. However, lower levels of N 2 uptake were observed [25] relative to the water vapour uptake herein. The water uptake (w/w %) for the biopolymers is given in parentheses; AM (28.…”

Section: Water Vapour Adsorption Isothermscontrasting

confidence: 59%

Vapour and Solution Uptake Properties of Starch and Cellulose Biopolymers

Dehabadi¹,

Shakouri²,

Simonson³

et al. 2018

GEP

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“…10 In a recent study of modified polysaccharides, the swelling behavior of these biomaterials in water, ethanol, and binary mixtures led to the hypothesis that CE-based materials may display molecular selective adsorption properties in water−alcohol mixtures. 28 Barley straw has a relatively high CE content, and this biomass sorbent displayed modest uptake selectivity between water and ethanol in binary mixtures. 25 To understand the molecular fractionation of such biosorbents, systematic uptake studies are required to further understand the molecular selective separation for binary water−ethanol (W− E) systems.…”

Section: ■ Introductionmentioning

confidence: 99%

“…28 The results of this study represent two key contributions to the field of energy production and chemical separation of biofuels as follows: (i) the development of a versatile NMR method for in situ quantitative analysis of biofuel mixtures and (ii) the elucidation of the role of CE materials for the adsorptive fractionation of water and ethanol. In this study, an investigation of the adsorptive properties of CE and its epichlorohydrin (EPI) cross-linked polymers was evaluated in W−E mixtures.…”

Section: ■ Introductionmentioning

confidence: 99%

Nuclear Magnetic Resonance Investigation of the Fractionation of Water–Ethanol Mixtures with Cellulose and Its Cross-Linked Biopolymer Forms

Dehabadi

Wilson

2015

Energy Fuels

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Cellulose (CE) was cross-linked with epichlorohydrin (EPI) at variable compositions, and the fractionation properties were investigated in binary water−ethanol (W−E) solutions, including the pure solvent systems. The relative uptake of each solvent was measured using quantitative 1 H nuclear magnetic resonance (qNMR) spectroscopy. This study highlights the utility of qNMR as a rapid screening method for estimation of solvent selective fractionation in binary mixtures. The uptake properties of CE−EPI cross-linked polymers with ethanol and water were well-described using the Sips isotherm model. Modeling shows that the monolayer surface coverage (Q m ) of ethanol and water onto the polymer materials covers a range (1.13−2.44 g/g) of values with heterogeneous adsorption behavior, in agreement with the Sips exponential fitting parameter (n s ≠ 1). The CE−EPI adsorbents display unique fractionation with water and ethanol from binary solutions, as evidenced by the relative selectivity (R selectivity ) value in binary W−E solvent systems. The R selectivity [Q m (W)/Q m (E)] values at saturative conditions varied (from 1.10 to 2.03) and further illustrate that CE materials display molecular selective solvent fractionation in binary W−E solutions. This study provides a greater molecular level understanding for the adsorptive uptake properties of CE that are relevant to developing CE-based adsorbent technology for the fractionation of biofuels and related chemical separations.

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“…Among these methods, adsorption proves to be the most effectively and widely used one because of its relatively low cost, ease of operation, and fewer harmful secondary products. Different adsorbents, such as red mud and fly ash [6], modified silica [7], activated carbon [8], modified alumina [9], polyacrylamide [10], polysaccharide [11], and polybenzimidazole [12], have been utilized for the removal of dyes and heavy metal ions from wastewater. However, these conventional adsorbents are either very costly or hard to be separated or non-degradable.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of hydrogel of hydroxypropyl cellulose (HPC) composited with graphene oxide and its application for methylene blue removal

et al. 2015

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Novel environmental friendly hydroxypropyl cellulose (HPC) hydrogels were fabricated upon compositing with graphene oxide (GO) in this work. In order to promote a more homogeneous dispersion of GO sheets in HPC, GO was firstly modified with HPC chains through esterification. The morphology and chemical structure of the functionalized HPC-GO were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometer, X-ray diffraction, and thermo-gravimetric analysis. Then scanning electronic microscope was employed to compare the morphologies of the HPC and HPC-GO/HPC hydrogels. The obtained HPC-GO/HPC hydrogels exhibited excellent adsorption performance toward methylene blue. Simulation of the practical use by preparing simple adsorption columns made from in situ formation of HPC-based hydrogels had given a visible observation of the significant adsorption effect brought by the incorporation of HPC-GO sheets. Adsorption kinetics were then imitated by Lagergren pseudo-first-order and pseudo-second-order models. Adsorption isotherms were imitated by Langmuir isotherm and Freundlich isotherm.

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Polysaccharide-based materials and their adsorption properties in aqueous solution

Cited by 60 publications

References 30 publications

Vapour and Solution Uptake Properties of Starch and Cellulose Biopolymers

Vapour and Solution Uptake Properties of Starch and Cellulose Biopolymers

Nuclear Magnetic Resonance Investigation of the Fractionation of Water–Ethanol Mixtures with Cellulose and Its Cross-Linked Biopolymer Forms

Fabrication of hydrogel of hydroxypropyl cellulose (HPC) composited with graphene oxide and its application for methylene blue removal

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