Adsorption Mechanism of Lignosulfonate at the Air/Liquid Interface

Yan, Mingfang; Yang, Dongjie

doi:10.5935/0103-5053.20150010

Cited by 6 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is in agreement, for example, with findings that suggest a smaller area per molecule at the interface at high salinity as compared to the low salinity condition [9,53]. In addition, an alignment of charged moieties into the aqueous phase is suggested, while the hydrophobic moieties are partly extended into the non-aqueous phase [131]. Overall, lignosulfonate addition caused a larger reduction of surface tension than polyelectrolyte polymers, such as sodium polyacrylate or sodium polystyrenesulfonate [94].…”

Section: Adsorption At Surfaces and Interfacessupporting

confidence: 87%

“…Surfaces 2020, 3 FOR PEER REVIEW 12 adsorption of lignosulfonates on solids [78,[128][129][130]. At the water-air surface or water-oil interface, lignosulfonate adsorption is evident by a decrease in surface or interfacial tension [9,94,131]. This decrease follows a linear-logarithmic progression with increasing lignosulfonate concentration [9,94], but above a certain concentration the effect can decrease in slope, which has been related to the aggregation onset by some authors [96,97].…”

Section: Adsorption At Surfaces and Interfacesmentioning

confidence: 99%

“…One study stated that lignosulfonates with a lower average molecular weight displayed a tendency to induce larger changes of interfacial tension [9], whereas another reported that with increasing molecular weight the effect on surface tension became stronger [95]. The reduction of surface or interfacial tension can further be enhanced by increasing ionic strength or by reducing the pH [53,86,131].…”

Section: Adsorption At Surfaces and Interfacesmentioning

confidence: 99%

“…The dynamics of lignosulfonate adsorption at the air-water interface was studied for example by Yan and Yang [131], who showed that the adsorption kinetics are faster at low pH or at high ionic strength. The authors furthermore measured Langmuir surface compression isotherms and proposed a generalized model, which is shown in Figure 9.…”

Section: Adsorption At Surfaces and Interfacesmentioning

confidence: 99%

See 3 more Smart Citations

A Critical Review of the Physicochemical Properties of Lignosulfonates: Chemical Structure and Behavior in Aqueous Solution, at Surfaces and Interfaces

Ruwoldt¹

2020

Surfaces

View full text Add to dashboard Cite

Lignosulfonates are bio-based surfactants and specialty chemicals, which are generated by breaking the near-infinite lignin network during sulfite pulping of wood. Due to their amphiphilic nature, lignosulfonates are used in manifold applications such as plasticizer, dispersant, and stabilizer formulations. Function and performance are determined by their behavior in aqueous solution and at surfaces and interfaces, which is in turn imposed by the chemical make-up. This review hence summarizes the efforts made into delineating the physicochemical properties of lignosulfonates, while also relating to their composition and structure. Lignosulfonates are randomly branched polyelectrolytes with abundant sulfonate and carboxylic acid groups to ensure water-solubility. In aqueous solution, their conformation, colloidal state, and adsorption at surfaces or interfaces can be affected by a range of parameters, such as pH, concentration of other electrolytes, temperature, and the presence of organic solvents. These parameters may also affect the adsorption behavior, which reportedly follows Langmuir isotherm and pseudo second-order kinetics. The relative hydrophobicity, as determined by hydrophobic interaction chromatography, is an indicator that can help to relate composition and behavior of lignosulfonates. More hydrophobic materials have been found to exhibit a lower charge density. This may improve dispersion stabilization, but it can also be disadvantageous if an electrokinetic charge needs to be introduced at solid surfaces or if precipitation due to salting out is an issue. In addition, the monolignol composition, molecular weight distribution, and chemical modification may affect the physicochemical behavior of lignosulfonates. In conclusion, the properties of lignosulfonates can be tailored by controlling aspects such as the production parameters, fractionation, and by subsequent modification. Recent developments have spawned a magnitude of products and technologies, which is also reflected in the wide variety of possible application areas.

show abstract

Section: Adsorption At Surfaces and Interfacessupporting

confidence: 87%

Section: Adsorption At Surfaces and Interfacesmentioning

confidence: 99%

Section: Adsorption At Surfaces and Interfacesmentioning

confidence: 99%

Section: Adsorption At Surfaces and Interfacesmentioning

confidence: 99%

See 2 more Smart Citations

A Critical Review of the Physicochemical Properties of Lignosulfonates: Chemical Structure and Behavior in Aqueous Solution, at Surfaces and Interfaces

Ruwoldt¹

2020

Surfaces

View full text Add to dashboard Cite

show abstract

“…Both standard values in terms of water absorption and thickness swelling could not be passed by the SSOL-PF based panel. This observation could be attributed to the unparalleled higher polarity and, hence, hydrophilicity of the lignosulfonates caused by the abundance of sulfonate groups which are not inherent to kraft lignin (Thakur et al 2014;Yan and Yang 2015). Owing to the high alkalinity (pH > > 7) and particular curing chemistry of phenol-formaldehyde resins, the abundance of sulfonate groups is assumed to be largely preserved in cured SSOL-PF resins which imparts them higher hydrophilicity as determined for PKL-PF resins.…”

Section: Resultsmentioning

confidence: 98%

Paper-based laminates produced with kraft lignin-rich phenol–formaldehyde resoles meet requirements for outdoor usage

et al. 2017

View full text Add to dashboard Cite

Suitability of lignin-phenol-formaldehyde (LPF) resoles was investigated for manufacturing paper-based high-pressure laminates. As lignin source, pine kraft lignin and spruce sodium lignosulfonate were compared, substituting 40 wt% of phenol by lignin in each case. The synthesized resins were characterized for their viscosity development, solid content, pH, free formaldehyde as well as free phenol content and B-time. Paper-based high-pressure laminates were manufactured using the two different resins. The laminates were exposed to different test climates and were compared for boiling water resistance, thickness swelling, bending properties and impact energy. The results indicate that pine kraft lignin performs superior to spruce sodium lignosulfonate for utilization in paper based laminates for outdoor usage due to a lower affinity of the pine kraft LPF laminates to water.

show abstract

Surface Phenomena with the Participation of Sulfite Lignin under Pressure Leaching of Sulfide Materials

Lugovitskaya

Rogozhnikov

2023

Langmuir

View full text Add to dashboard Cite

Searching for surfactants which can eliminate the occluding effect of molten elemental sulfur formed in the process of leaching sulfide ores under pressure (autoclave leaching) is relevant. However, the choice and use of surfactants are complicated by the harsh conditions of the autoclave process, as well as the insufficient knowledge of surface phenomena in their presence. This paper presents a comprehensive study of interfacial phenomena (adsorption, wetting, and dispersion) involving surfactants (using lignosulfonates as an example) and zinc sulfide/concentrate/elemental sulfur under conditions simulating sulfuric acid leaching of ores under pressure. The influence of concentration (C LS 0.1−1.28 g/dm 3 ), features of the molecular weight (M̅ w , 9.250−46.300 Da) composition of lignosulfates, temperature (10−80 °C), addition of sulfuric acid (CH 2 SO 4 0.2−10.0 g/dm 3 ), and properties of solid-phase objects (surface charge, specific surface area, presence and diameter of pores) on surface phenomena at the liquid−gas and liquid−solid interfaces was revealed. It was found that with an increase in molecular weight and a decrease in the degree of sulfonation, the surface activity of lignosulfonates at the liquid−gas interface, as well as their wetting and dispersing activity with respect to zinc sulfide/concentrate increases. It has been found that an increase in temperature contributes to the compaction of the macromolecule of lignosulfonates, as a result of which their adsorption at the liquid−gas and liquid−solid interface in neutral media rises. It has been shown that the introduction of sulfuric acid into aqueous solutions increases the wetting, adsorption, and dispersing activity of lignosulfonates with respect to zinc sulfide. The latter is accompanied by a decrease in the contact angle θ (by 10 and 40°) and an increase in both the specific number of zinc sulfide particles (not less than 1.3−1.8 times) and the content of fractions with a size of −3.5 μm. It has been established that the functional effect of lignosulfonates under conditions simulating sulfuric acid autoclave leaching of ores is implemented through the adsorption−wedging mechanism.

show abstract

Adsorption Mechanism of Lignosulfonate at the Air/Liquid Interface

Cited by 6 publications

References 0 publications

A Critical Review of the Physicochemical Properties of Lignosulfonates: Chemical Structure and Behavior in Aqueous Solution, at Surfaces and Interfaces

A Critical Review of the Physicochemical Properties of Lignosulfonates: Chemical Structure and Behavior in Aqueous Solution, at Surfaces and Interfaces

Paper-based laminates produced with kraft lignin-rich phenol–formaldehyde resoles meet requirements for outdoor usage

Surface Phenomena with the Participation of Sulfite Lignin under Pressure Leaching of Sulfide Materials

Contact Info

Product

Resources

About