Sorption of dyes on cellulose II

Effect of alkali treatment of fibre and dye structure

Parikshit Goswami, Richard S. Blackburn, Jim Taylor, Patrick White

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Cellulose is a linear 1,4-β-glucan polymer where the units are able to form highly ordered structures, as a result of extensive interaction through intra- and intermolecular hydrogen bonding of the three hydroxyl groups in each cellulose unit. Alkali has a substantial influence on morphological, molecular and supramolecular properties of cellulose II polymer fibres causing changes in crystallinity. Lyocell fibres pre-treated with 0.0, 2.0, and 4.0 mol dm-3 aqueous NaOH solution were dyed with hydrolyzed reactive dyes that had different molecular shapes and sizes. Overall exhaustion (qe), value of K, and -ΔG increased for lyocell samples pre-treated with aqueous NaOH solution in the following order: 2.0 > 4.0 > 0.0 mol dm-3 NaOH. The same trends were observed for colour strength (K/S) values of the dyeings. Pre-treatment of lyocell with 2.0 mol dm-3 NaOH creates the substrate that achieves the most thermodynamically favourable system for sorption of hydrolyzed reactive dyes, as at this concentration crystallinity decreases (with respect to 0.0 mol dm-3 NaOH treated lyocell) to afford higher sorption; however, at higher alkali concentrations the macro-sorbent forms a compacted unit that limits diffusion within the sorbent interior. Molecular size of the sorbate dye has a significant effect on the sorption process: for the largest dye structure the sorption isotherm is most closely correlated to a Langmuir isotherm; as the size of the dye decreases correlation to a Langmuir isotherm is observed, but with good correlation to the Freundlich isotherm; as the size of the dye is decreased further sorption is more typical of a Freundlich isotherm.

Original languageEnglish
Pages (from-to)1063-1072
Number of pages10
JournalCellulose
Volume18
Issue number4
DOIs
Publication statusPublished - Aug 2011
Externally publishedYes

Fingerprint

Alkalies
Cellulose
Sorption
Coloring Agents
Dyes
Isotherms
Fibers
Sorbents
Polymers
Dyeing
Hydroxyl Radical
Macros
Hydrogen bonds
Color
Substrates

Cite this

Goswami, Parikshit ; Blackburn, Richard S. ; Taylor, Jim ; White, Patrick. / Sorption of dyes on cellulose II : Effect of alkali treatment of fibre and dye structure. In: Cellulose. 2011 ; Vol. 18, No. 4. pp. 1063-1072.
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Sorption of dyes on cellulose II : Effect of alkali treatment of fibre and dye structure. / Goswami, Parikshit; Blackburn, Richard S.; Taylor, Jim; White, Patrick.

In: Cellulose, Vol. 18, No. 4, 08.2011, p. 1063-1072.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Sorption of dyes on cellulose II

T2 - Effect of alkali treatment of fibre and dye structure

AU - Goswami, Parikshit

AU - Blackburn, Richard S.

AU - Taylor, Jim

AU - White, Patrick

PY - 2011/8

Y1 - 2011/8

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KW - Freundlich isotherm

KW - Hydrolyzed reactive dye

KW - Langmuir isotherm

KW - Lyocell

KW - Polysaccharides

KW - Sodium hydroxide

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U2 - 10.1007/s10570-011-9540-0

DO - 10.1007/s10570-011-9540-0

M3 - Article

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EP - 1072

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JF - Cellulose

SN - 0969-0239

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