Relationship of the structure and ion-exchange properties of polyelectrolyte complexes based on biopolymers

Паламарчук, И. А.; Бровко, О. С.; Боголицын, К. Г.; Бойцова, Т. А.; Ladesov, A. V.; Ивахнов, А. Д.

doi:10.1134/s1070427215010152

Cited by 18 publications

(4 citation statements)

References 2 publications

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“…In the region between 3000–3500 cm −1 , a broad signal appeared in both fractions and was assigned to the stretching of O–H bonds. The peaks at 2930 and 2852 cm −1 were caused by the stretching of C–H bonds in the lignin and polysaccharides [21,22]. The peak at 1736 cm −1 was assigned to the acetyl groups on the GGM and was visible in both fractions, albeit at greater intensity in the polysaccharide-rich fraction.…”

Section: Resultsmentioning

confidence: 99%

“…The signals at 1082 and 1026 cm −1 were ascribed to vibrations of asymmetrical C–O–C bonds. The signal at 1082 cm −1 was less intense in the lignin-rich fraction, indicating that it originated from internal vibrations of the pyranose structure in the polysaccharides [21]. Two signals were detected in the low wavenumber region and were assigned to the sulfonate groups in the lignin (650 and 517 cm −1 ).…”

Section: Resultsmentioning

confidence: 99%

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Impact of Lignin Content on the Properties of Hemicellulose Hydrogels

et al. 2018

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Hemicellulose is a promising renewable raw material for the production of hydrogels. This polysaccharide exists in large amounts in various waste streams, in which they are usually impure and heavily diluted. Several downstream processing methods can be combined to concentrate and purify the hemicellulose. However, such an approach can be costly; hence, the effect of impurities on the formation and properties of hydrogels must be determined. Lignin usually exists in these waste streams as a major impurity that is also difficult to separate. This compound can darken hydrogels and decrease their swellability and reactivity, as shown in many studies. Other properties and effects of lignin impurities are equally important for the end application of hydrogels and the overall process economy. In this work, we examined the feasibility of producing hydrogels from hemicelluloses that originated from sodium-based spent sulfite liquor. A combination of membrane filtration and anti-solvent precipitation was used to extract and purify various components. The influence of the purity of hemicellulose and the addition of lignosulfonates (emulated impurities in the downstream processing) to the crosslinking reaction mixture on the mechanical, thermal, and chemical properties of hydrogels was determined.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Impact of Lignin Content on the Properties of Hemicellulose Hydrogels

et al. 2018

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“…The peak at 2930 cm −1 is prominent in the spectra obtained without contact medium, but insignificant in those where deuterium oxide was used as contact medium. This could be caused by the stretching of C–H bonds in the methyl and methylene groups [ 23 , 26 , 27 , 28 ], and can be associated with lignin, phenolic compounds such as wood extractives, or other organic compounds.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Analysis of Foulants in an Ultrafiltration Membrane Used for the Treatment of Bleach Plant Effluent in a Sulfite Pulp Mill

et al. 2021

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Fouling is a major obstacle in the introduction of membrane processes in new applications in the pulping industry. Due to the complex nature of the feed solutions, complementary analysis methods are usually needed to identify the substances involved. Four different methods were used for the comprehensive analysis of a membrane removed from an ultrafiltration plant treating alkaline bleach plant effluent in a sulfite pulp mill to identify the substances causing fouling. Magnesium was detected both on the membrane surface and in the nonwoven membrane backing and a small amount of polysaccharides was detected after acid hydrolysis of the fouled membrane. This study provides information on foulants, which can be used to improve processing conditions and cleaning protocols and thus the membrane performance in pulp mill separation processes. It also provides an overview of the usefulness of various analytical methods.

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“…PECs was from the required functional properties (Palamarchuk et al, 2015). The PECs membrane can be operated in heavy metal adsorption.…”

Section: Polyelectrolyte Complexes With Wastewater Adsorption Applica...mentioning

confidence: 99%

Development of composite polyelectrolyte complex membrane for cationic dye and heavy metal sorption

Chueasupcharoen

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The sorption process is most useful in water treatment because it provides high sorption efficiency, low cost and rapid method. Polyelectrolyte complex (PECs) is a novel polymeric membrane prepared by mixing between oppositely charged polyelectrolyte solution of PDADMAC and PSS. Activated carbon (ACs) is used to improved adsorption efficiency in PECs. Non-stoichiometric PDADMAC/PSS membrane were prepared by mixing excess PSS concentration to get the negative charges on the membrane surface. Sorption efficiency was evaluated by methylene blue, cationic dye and heavy metal ions based on the same material, the difference sorption mechanism were observe. In the cationic dye, the adsorption mechanism operated by excess PSS on membrane surface via electrostatic interaction. The maximum adsorption capacity occur in a removal salt 1:2 PDADMAC:PSS mole ratio (R-1:2) without AC which is 4.9 mg g-1 with 10 mg l-1 of methylene blue concentration. Furthermore, R-1-2 fitted with pseudo-second order kinetic model and Temkin isotherm model with physical adsorption type and also regenerated by salt solution. In contrast, the heavy metal ions sorption operated ion exchange mechanism, 1:2 PDADMAC:PSS without AC show highest sorption capacity which is 30 mg g-1 with 50 mg l -1 of Cu2+ ions concentration. The mechanism occur between Na+ on PSS chain and Cu2+ ions in solution. The metal ions sorption fitted with pseudo-second order kinetic model and Freundlich isotherm model with chemical sorption type and bilayer surface sorption and shows high selective of Pb2+ and Cr 3+metal ions.

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Relationship of the structure and ion-exchange properties of polyelectrolyte complexes based on biopolymers

Cited by 18 publications

References 2 publications

Impact of Lignin Content on the Properties of Hemicellulose Hydrogels

Impact of Lignin Content on the Properties of Hemicellulose Hydrogels

Comprehensive Analysis of Foulants in an Ultrafiltration Membrane Used for the Treatment of Bleach Plant Effluent in a Sulfite Pulp Mill

Development of composite polyelectrolyte complex membrane for cationic dye and heavy metal sorption

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