Phosphate uptake studies of cross-linked chitosan bead materials

Mahaninia, Mohammad H.; Wilson, Lee D.

doi:10.1016/j.jcis.2016.09.031

Cited by 66 publications

(37 citation statements)

References 72 publications

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“…The mechanism of NAFC uptake is illustrated in Scheme 1 below. It is noted that the pKa of chitosan used in this work (data not shown) is 6.2, according to a potentiometric titration that agrees with other related studies for chitosan (Roberts, 1992;Mahaninia & Wilson, 2017). Thus, the use of conditions in aqueous media that lie below pH 6 led to protonation of the glucosamine groups of chitosan.…”

Section: Sequestration Of Nafcssupporting

confidence: 89%

Solubilized Chitosan Biopolymers for Sequestration of Organic Acids in Aquatic Environments after Biodegradation in a Constructed Wetland Treatment System

Mohamed¹,

Ajaero²,

McMartin³

et al. 2018

IJTech

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Pristine chitosan was dissolved in two different respective aqueous acids, namely acetic acid (AcA) and hydrochloric acid (HCl). The respective acid solutions were used as media to associate with naphthenic acid fraction compounds (NAFCs) from raw oil sands process water (R-OSPW) contaminants and constructed treatment wetland systems OSPW (CWTS-OSPW) samples. The results revealed selective removal of NAFCs and lyotropic effects due to variable counterion binding of chloride versus acetate with the ionized NAFCs (carboxylate species).

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Section: Sequestration Of Nafcssupporting

confidence: 89%

Solubilized Chitosan Biopolymers for Sequestration of Organic Acids in Aquatic Environments after Biodegradation in a Constructed Wetland Treatment System

Mohamed¹,

Ajaero²,

McMartin³

et al. 2018

IJTech

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“…The kinetic adsorption profiles are well-described by the pseudo-second order model, in agreement with the presence of multiple adsorption sites for such binary goethite-cellulose composites. The binary GC composites reported herein are anticipated to serve as unique adsorbents for the controlled uptake of inorganic and organic anions due to their sustainability and synthetic versatility (Mahaninia & Wilson, 2017a). Further studies are underway to develop cellulose-based materials with paramagnetic properties for magnetophoretic processing of water and wastewater (Hena, Fatihah, Tabassum & Jing, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…Kinetic uptake isotherms provide information on the dynamic adsorption parameters, as described elsewhere (Mahaninia & Wilson, 2017a;Mahaninia & Wilson, 2017b). The kinetic parameters for ROX uptake (qt, mg/g) with the various sorbent materials are shown in Figure 8 (ab).…”

Section: "One Pot" Kinetic Uptakementioning

confidence: 99%

Synthesis and characterization of cellulose-goethite composites and their adsorption properties with roxarsone

Kong

Wilson

2017

Carbohydrate Polymers

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“…However, the role of chitosan modification and its relationship to the structure–adsorption properties of the bead systems with sulfate requires further study. Previous work indicates that cross-linking with glutaraldehyde converts the accessible amine groups to imine linkages and alteration of the bead physical properties [ 24 , 25 , 57 , 58 ], in contrast to pristine chitosan beads without synthetic modification.…”

Section: Resultsmentioning

confidence: 99%

Modular Chitosan-Based Adsorbents for Tunable Uptake of Sulfate from Water

Steiger

Wilson

2020

IJMS

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The context of this study responds to the need for sorbent technology development to address the controlled removal of inorganic sulfate (SO42−) from saline water and the promising potential of chitosan as a carrier system for organosulfates in pharmaceutical and nutraceutical applications. This study aims to address the controlled removal of sulfate using chitosan as a sustainable biopolymer platform, where a modular synthetic approach was used for chitosan bead preparation that displays tunable sulfate uptake. The beads were prepared via phase-inversion synthesis, followed by cross-linking with glutaraldehyde, and impregnation of Ca2+ ions. The sulfate adsorption properties of the beads were studied at pH 5 and variable sulfate levels (50–1000 ppm), where beads with low cross-linking showed moderate sulfate uptake (35 mg/g), while cross-linked beads imbibed with Ca2+ had greater sulfate adsorption (140 mg/g). Bead stability, adsorption properties, and the point-of-zero charge (PZC) from 6.5 to 6.8 were found to depend on the cross-linking ratio and the presence of Ca2+. The beads were regenerated over multiple adsorption-desorption cycles to demonstrate the favorable uptake properties and bead stability. This study contributes to the development of chitosan-based adsorbent technology via a modular materials design strategy for the controlled removal of sulfate. The results of this study are relevant to diverse pharmaceutical and nutraceutical applications that range from the controlled removal of dextran sulfate from water to the controlled release of chondroitin sulfate.

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Phosphate uptake studies of cross-linked chitosan bead materials

Cited by 66 publications

References 72 publications

Solubilized Chitosan Biopolymers for Sequestration of Organic Acids in Aquatic Environments after Biodegradation in a Constructed Wetland Treatment System

Solubilized Chitosan Biopolymers for Sequestration of Organic Acids in Aquatic Environments after Biodegradation in a Constructed Wetland Treatment System

Synthesis and characterization of cellulose-goethite composites and their adsorption properties with roxarsone

Modular Chitosan-Based Adsorbents for Tunable Uptake of Sulfate from Water

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