Physicochemical properties of sodium lignosulfonates (NaLS) modified by laccase

Zhou, Haifeng; Yang, Dongjie; Wu, Xiaolei; Deng, Yonghong; Qiu, Xueqing

doi:10.1515/hf-2011-0189

Cited by 30 publications

(24 citation statements)

References 31 publications

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“…Lignin is the second most abundant biomacromolecule in terrestrial plants and it is getting increased attention as a renewable aromatic compound (Dizhbite et al 1999;Zhou et al 2012). Lignosulfonate (LS) is a water-soluble technical lignin with properties of anionic surfactants and is a byproduct of the waste liquor from sulfite pulp mills.…”

Section: Introductionmentioning

confidence: 99%

Aggregation of sodium lignosulfonate above a critical temperature

Qian¹,

Deng²,

Qiu³

et al. 2014

Holzforschung

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Single molecules of sodium lignosulfonate (NaLS) were prepared and their aggregation behavior was studied as a function of temperature. The molecular dispersity of the NaLS solutions were confirmed by dynamic light scattering (DLS), and the aggregation behavior was studied by DLS and static light scattering (SLS), fluorescence spectrometry (FS), and atomic force microscopy (AFM). It was demonstrated that NaLS molecules started to aggregate above a critical temperature and the aggregation behavior was related to their spherical microgel conformation and hydrophobic interaction. During the DLS measurement, when NaLS was dissolved in 1.2 mol·l -1 NaCl aqueous solution and then filtered with 0.45 μm syringe filter, the slowmode diffusion (smD) corresponded to the polyelectrolyte effect and the original aggregates disappeared and the fast-mode diffusion (fmD) corresponded to the monomolecular NaLS (not yet aggregated) in the solution. When the temperature of the NaLS solution was raised to 38°C, the disappeared smD in DLS analysis appeared again, indicating that NaLS molecules started to form new aggregates. Due to the aggregation at 38°C, molecular weight (M w ) obtained from the SLS had a sharp increase, intensity ratio (I 1 /I 3 ) of pyrene in FS suddenly decreased, and the adsorption of NaLS on a solid substrate and the corresponding roughness of the surface increased significantly.

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Section: Introductionmentioning

confidence: 99%

Aggregation of sodium lignosulfonate above a critical temperature

Qian¹,

Deng²,

Qiu³

et al. 2014

Holzforschung

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“…NaLS was found to form aggregates with different size distributions in diluted aqueous solution when its concentration exceeded the critical aggregation concentration (CAC) Yan et al 2010 ;Qian et al 2012 ;Zhou et al 2012 ). The aggregation is also affected by the pH and ionic strength of the solution.…”

Section: Introductionmentioning

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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“…It is an anionic polyelectrolyte polymer and contains both hydrophobic and hydrophilic groups (Mancera et al 2011;Qian et al 2013). Because of sulfonic groups, lignosulfonates have good water solubility and a strong polyelectrolytic behavior (Askvik et al 2001;Liang et al 2013), which are useful for a variety of applications, such as dispersants for coal-water slurry (Ouyang et al 2006;Zhou et al 2012), cement-water suspensions (Yang et al 2007), oil-well drilling additives (Chiwetelu et al 1994), industrial binders (Chen and Wu 1994), agricultural chemicals (Pradip and Fuerstenau 1991), and floating chemicals (Kelebek et al 2001;Ma and Pawlik 2007;Martin-Ortiz et al 2009), just to mention a few.…”

Section: Introductionmentioning

confidence: 99%

Effects of concentration and temperature on the rheological behavior of concentrated sodium lignosulfonate (NaLS) solutions

et al. 2014

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Concentrated sodium lignosulfonate (NaLS) solutions have wide industrial applications. Therefore, the viscoelastic properties of NaLS in concentrations of 55%-63% have been investigated between 5°C and 55°C by means of a dynamic rheological technique, namely, the oscillatory rheological experiments were conducted in a rheometer in the small amplitude oscillatory mode. All solutions showed "shear-thinning" behavior over frequency. The complex viscosity (η*) increased and the loss tangent (tanδ) decreased with increasing concentrations. Both the storage modulus (G′) and the loss modulus (G″) increased with increasing frequencies and concentrations. The change in viscoelastic behavior was probably caused by stronger aggregation effects. However, the effects of temperature on the viscoelastic properties are more complex. For 60% NaLS, G′, G″, and η* decreased, but tanδ increased with increasing temperatures. When the temperature exceeded 20°C, G′, G″, and η* increased, but tanδ decreased, and the relaxation times were increased as a function of temperature. The change in viscoelasticity as a function of temperature may also be related to intermolecular aggregation and the swelling of aggregates. The conductivity experiments indicated that the formation of a greater strength of network structures at higher levels of concentrations between 55% and 63% and temperatures between 20°C and 55°C was probably responsible for elasticity enhancement.

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Physicochemical properties of sodium lignosulfonates (NaLS) modified by laccase

Cited by 30 publications

References 31 publications

Aggregation of sodium lignosulfonate above a critical temperature

Aggregation of sodium lignosulfonate above a critical temperature

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

Effects of concentration and temperature on the rheological behavior of concentrated sodium lignosulfonate (NaLS) solutions

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