New aspects in cationization of lignocellulose materials. II. Distribution of functional groups in lignin, hemicellulose, and cellulose components

Antal, Miroslav; Ebringerová, Anna; Simkovic, I

doi:10.1002/app.1984.070290220

Cited by 25 publications

(12 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, Antal et al (1984a) found the effect of CHMAC modification on beech sawdust to be limited to the cell wall surface. Since lignin created a network across the cell wall surface, Antal et al (1984b) found the quaternization reaction with cellulose to be hindered. Moreover, Ebringerova et al (1986) also indicated that the delignification of lignocellulosic byproducts would increase reaction efficiency with CHMAC.…”

Section: Resultsmentioning

confidence: 99%

Quaternized agricultural by-products as anion exchange resins

Wartelle

Marshall

2006

Journal of Environmental Management

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Quaternized agricultural by-products as anion exchange resins

Wartelle

Marshall

2006

Journal of Environmental Management

View full text Add to dashboard Cite

“…Preparation of cationic xylan can be performed by cationization of xylan-rich lignocellulosic material followed by water/alkaline extraction and isolation of the modified xylan (e.g. Antal et al 1984;Š imkovic et al 1990), or it can be done directly by cationization of pre-isolated and purified xylan (e.g. Ebringerová et al 1994;Schwikal et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of cationized barley husk xylan on kraft pulp fibres: influence of degree of cationization on adsorption characteristics

2009

View full text Add to dashboard Cite

A water-soluble (glucurono)arabinoxylan (GAX) was isolated from barley husk using chlorite delignification followed by alkaline extraction and enzymatic purification of the extract. The isolated xylan was shown to adsorb on bleached softwood kraft fibres, but the degree of adsorption was rather low under the applied conditions. This can be explained by the inhibited adsorption of GAX molecules with a relatively high degree of arabinofuranosyl substitution, as indicated by iodine complexation and neutral carbohydrate analysis of the non-adsorbing xylans. In order to increase the driving force for adsorption of the more highly substituted GAX, the xylan was cationized through a reaction in an aqueous alkaline medium with 2,3-epoxypropyltrimethylammonium chloride (EPTMAC). The chemical modification of xylan was confirmed by using 1 H-13 C HSQC (Heteronuclear Single Quantum Coherence) NMR, and was quantified by using elemental analysis. The GAX cationization, which introduced cationic charge densities ranging from 110 to 740 leq/g, was shown to increase the rate and magnitude of adsorption extensively, due to the induced electrostatic interaction between the anionic fibres and the cationic xylan. Similar to non-modified xylan, cationic xylan possessed a non-electrostatic cellulose surface affinity, as shown by adsorption at high ionic-strength and on esterified (carboxyl-free) pulp fibres.

show abstract

“…Navarro et al 3 synthesized an adsorbent for heavy metals by reacting cellulose with epichlorohydrin and polyethyleneimine and obtained a product with an adsorption capacity of 1.44 mmol g −1 for mercury. Antal et al 4,5 described the preparation and distribution of functional groups in lignocellulosic material after reaction with N-(3-chloro-2-hydroxypropyl) trimethylammonium chloride. The effect of the reaction was found to be limited to the cell wall surface using beech sawdust as the source of lignocellulose.…”

Section: Introductionmentioning

confidence: 99%

An anion exchange resin from soybean hulls

Marshall¹,

Wartelle²

2004

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

Agricultural by-products are generally poor adsorbents of anions in solution. Therefore, modification of the by-product could enhance its anion exchange capabilities. The objective of this study was to increase the anion exchange properties of the agricultural by-product, soybean hulls, by chemical modification. Soybean hulls were quaternized with the quaternizing agent, N-(3-chloro-2-hydroxypropyl) trimethylammonium chloride, in the presence of a strongly alkaline environment. This modification increased the amount of positive charge on the hulls as evidenced by increased nitrogen content and increased uptake of anions compared with the unmodified hulls. A method to optimize the anion exchange properties of the hulls was developed. Ion exchange properties of the hulls toward anions of environmental significance, namely arsenate (As), chromate (Cr), dichromate (Cr 2 ), phosphate (P) and selenate (Se) were determined. The modified hulls were also compared with commercial cellulose-based and synthetic anion exchange resins in their ability to remove these anions from solution. The experimental and commercial resins were also compared for their ability to remove a mixture of arsenate, chromate, dichromate and selenate from laboratory prepared solutions to levels below the maximum contaminant levels for these anions in drinking water as specified by the US Environmental Protection Agency (US EPA). Our results demonstrate that the soy hull resin is more efficient in anion removal than the commercial cellulose-based resin but not as effective as the commercial synthetic resin.

show abstract

New aspects in cationization of lignocellulose materials. II. Distribution of functional groups in lignin, hemicellulose, and cellulose components

Cited by 25 publications

References 2 publications

Quaternized agricultural by-products as anion exchange resins

Quaternized agricultural by-products as anion exchange resins

Adsorption of cationized barley husk xylan on kraft pulp fibres: influence of degree of cationization on adsorption characteristics

An anion exchange resin from soybean hulls

Contact Info

Product

Resources

About