Preparation and Evaluation of Carboxymethylated Lignin as Dispersant for Aqueous Graphite Suspension Using Turbiscan Lab Analyzer

Gan, Linhuo; Zhou, Mingsong; Yang, Dongjie; Qiu, Xueqing

doi:10.1080/01932691.2012.686248

Cited by 51 publications

(35 citation statements)

References 18 publications

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“…Cerrutti et al (2012) observed that the dispersion stability of aqueous ceramic suspension was improved significantly with adding CML as a stabilizer. Gan et al (2013a) found the same for aqueous graphite suspension. Regardless of these practically useful findings, the theoretical backgrounds of CML behavior in solution are not known.…”

Section: Introductionsupporting

confidence: 63%

Influence of carboxylic group content on the solution behavior of carboxymethylated lignin (CML) in water

2014

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Carboxymethylated lignin (CML) is well suited as a dispersant or natural adsorbent applied in ceramics, gypsum paste, graphite suspension, and water treatment. In this paper, the effects of COOH content in CML on its behavior in water and the dispersion stability of aqueous graphite suspension has been investigated by means of viscosimetry, surface tension measurement, fluorescence spectrometry, dynamic light scattering (DLS), Turbiscan Lab Expert (TLE) stability analysis, and ζ potential measurement. Viscosimetry clearly revealed the polyelectrolyte effect in diluted aqueous solution of CML. With a higher COOH content of CML, the surface tension of water is reduced. Moreover, the aggregation behavior of CML was strengthened with increasing COOH content, leading to a more compact molecular structure of the aggregates. Based on the results, an aggregation model was proposed to illustrate the variations in the solution behavior of CML with different COOH contents at various concentrations. The dispersion stability of aqueous graphite suspension was improved by adding CML with high COOH content.

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Section: Introductionsupporting

confidence: 63%

Influence of carboxylic group content on the solution behavior of carboxymethylated lignin (CML) in water

2014

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“…Materials CML samples were synthesized by etherifi cation with monochloroacetic acid and wheat straw AL (Shandong Paper Mill, China) in an alkaline aqueous solution as described by Gan et al (2012b) . The CML1 and CML2 samples with diff erent COOH group contents were selected.…”

Section: Methodsmentioning

confidence: 99%

Aggregation and adsorption behaviors of carboxymethylated lignin (CML) in aqueous solution

Gan¹,

Zhou²,

Yang³

et al. 2012

Holzforschung

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Carboxymethylated lignin (CML) as a watersoluble lignin derivative is a multipurpose adsorbent and dispersant. In this article, the aggregation and adsorption behaviors of CML have been investigated in aqueous solution using fluorescence spectroscopy, dynamic light scattering, and a quartz crystal microbalance combined with dissipation monitoring techniques. It was found that CML forms aggregates when its concentration exceeds the critical aggregation concentration (CAC). The CAC of CML1 with a carboxylic (COOH) group content of 2.8 mmol g -1 was 0.022 g l -1 , and that of CML2 with a COOH group content of 2.0 mmol g -1 was 0.026 g l -1 . The adsorption behavior of CML on the gold surface was strongly dependent on the pH and ionic strength of the solution. At low pH and ionic strength, more CMLs were adsorbed at the gold/water interface, and the layers were rigid. The results could be used not only from the theoretical but also from the application point of view.

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“…The absorption peaks at 2930 cm -1 and 2300 cm -1 correspond to C-H and C=C stretches of aldehyde groups [2]. There are three strong absorption peaks at 1600, 1510 and 1454 cm -1 assigned to aromatic skeletal vibrations [31].…”

Section: Ftir Analysismentioning

confidence: 97%

“…The industrial applications of kraft lignin are limited due to its poor water solubility [8], thus improving the water solubility of kraft lignin can widen its application in various industries including the mining, painting, oil and pulp and paper. In the past, various studies were conducted on preparing water soluble alkali lignin through chemical modifications such as sulfonation [9], oxidation [10], and copolymerization [2]. However, due to the rigorous reaction conditions, including high temperature and the use of expensive catalysts and organic solvents, the large scale production of carboxmethylated lignin following the previous reactions is not economically feasible [2,9,10].…”

Section: Introductionmentioning

confidence: 99%

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Production of carboxymethylated lignin and its application as a dispersant

Konduri

Kong

Fatehi

2015

European Polymer Journal

110

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Preparation and Evaluation of Carboxymethylated Lignin as Dispersant for Aqueous Graphite Suspension Using Turbiscan Lab Analyzer

Cited by 51 publications

References 18 publications

Influence of carboxylic group content on the solution behavior of carboxymethylated lignin (CML) in water

Influence of carboxylic group content on the solution behavior of carboxymethylated lignin (CML) in water

Aggregation and adsorption behaviors of carboxymethylated lignin (CML) in aqueous solution

Production of carboxymethylated lignin and its application as a dispersant

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