Hydroxymethylation of a sodium lignosulfonate: molar mass distributions by SEC with dual detection

Journal of Liquid Chromatography &amp Related Technologies, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 8

Published: Feb. 23, 2025

Lignosulfonates (LS) are employed as partial substitution of phenol in phenolic resins; but to increase their reactivity they require an initial hydroxymethylation reaction. Dual-detection size exclusion chromatography (SEC) is here for analyzing the evolution molar mass distributions (MMDs) along that The chromatograms were obtained with a UV detector at 254 nm, series differential refractometer (DR). While DR was assumed detect total instantaneous eluent, signal aromatic rings lignin polymer, not low carbohydrate contaminants. reactive fraction exhibited bimodal distribution, two main components different average masses. Along reaction, only increased masses, and higher component also reactivity. Deconvolution procedures applied estimate MMDs contaminants, lignin, components.

Language: Английский

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Lignin-based hydrogels for application in agriculture: A review

International Journal of Biological Macromolecules, Journal Year: 2025, Volume and Issue: 306, P. 141744 - 141744

Published: March 4, 2025

Language: Английский

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Lignin: Application in Three-Dimensional Printing

Published: Jan. 1, 2025

Language: Английский

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Hydrophobic deep eutectic solvents for the sono-degradation of organic pollutants in wastewater

Comptes Rendus Chimie, Journal Year: 2025, Volume and Issue: 28(G1), P. 327 - 338

Published: March 24, 2025

Phenol and 4-nitrophenol (4-NP) are hazardous, recalcitrant, biorefractory contaminants found in wastewater generated from process industries. Even low concentrations, they highly poisonous. The degradation of these pollutants is imperative due to their solubility water toxicity the biosphere. In this study, two long-chain, organic acid based hydrophobic deep eutectic solvents (HDESs) were prepared, characterized, used synergy with hydrogen peroxide for ultrasonic wastewater. These HDESs menthol–decanoic (MC10) menthol–dodecanoic (MC12). phenol 4-NP. effects different variables such as pH, oxidant dose, temperature, time on 4-NP efficiency simulated studied. For degradation, pH 4 provided best result while 4-NP, 5 result. MC10-HDES/H2O2 system, an dose 15% v/v temperature 60 °C yielded 76% 94.46% MC12-HDES/H2O2 17% 58.98% 61.08% parameters results then treat refinery percentage reductions total compounds (TOC) 88.75 67.08% MC10- systems respectively. recyclability was also investigated three runs. TOC reduced 33.33% MC10 67.08 11.25% MC12. prove be effective treatment contaminated Supplementary Materials: material article supplied a separate file: crchim-385-suppl.pdf Le phénol et le 4-nitrophénol sont des dangereux, récalcitrants bioréfractaires que l'on trouve dans les eaux usées générées par industries de transformation. Même à faible concentration, ils extrêmement toxiques. La dégradation ces polluants est impérative en raison leur solubilité l'eau toxicité pour la biosphère. Dans cette étude, deux solvants eutectiques profonds hydrophobes (HDES) base d'acide organique longue chaîne ont été préparés, caractérisés utilisés synergie avec peroxyde d'hydrogène ultrasons usées. Ces HDES l'acide menthol-décanoïque menthol-dodécanoïque Les générer HDES/H2O2 systemes destinés du effets différentes procédé telles d'oxydant, température temps sur l'efficacité simulées étudiés. Pour phénol, donné meilleur résultat tandis résultat. Systeme MC10, une d'oxydant 15 % meilleure efficacité dégradation, systeme MC12, 17 dégradation. résultats ensuite traiter raffineries. pourcentage réduction composés organiques totaux (COT) était respectivement 88,75 67,08 recyclabilité également étudiée lors trois essais. COT passé 33,33 11,25 obtenus prouvent ce efficace traitement contaminées au Compléments : Des compléments fournis cet fichier séparé

Language: Английский

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Exploring the Impact of Emerging Pretreatment Technologies on Effective Lignocellulosic Biomass Utilization

Published: Jan. 1, 2025

Language: Английский

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Oxidative Depolymerization of Hardwood Lignin to High-Value Aromatics: Optimization by Response Surface Methodology and DFT Study of the Monomers

Topics in Catalysis, Journal Year: 2025, Volume and Issue: unknown

Published: April 28, 2025

Language: Английский

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Production, Purification, and Characterization of Recombinant Bhargavaea beijingensis Laccase for Potential Lignin Degradation and Dyes Decolorization

Catalysis Letters, Journal Year: 2023, Volume and Issue: 154(4), P. 1537 - 1546

Published: July 5, 2023

Language: Английский

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Separation and Purification of Vanillin and Syringaldehyde from an Oxidized Kraft Liquor – A Mini Review

Chemie Ingenieur Technik, Journal Year: 2024, Volume and Issue: 96(4), P. 418 - 431

Published: March 11, 2024

Abstract Lignin is one of the most abundant bio‐aromatic molecular resources, but it currently underutilized for energy production in pulp and paper industry. Unlocking full potential lignin could have a significant impact on reducing environmental pollution, increasing use renewable achieving environmentally beneficial economic growth. However, effective valorization requires viable integrated reaction separation processes to produce high value monomeric phenolics, such as vanillin syringaldehyde. The aim this short review summarize studies different methods derivatives obtained from black liquor, including extraction, membrane filtration, chromatographic separation, combination technologies.

Language: Английский

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Development of high-performance biocomposites through lignin modification and fiber reinforcement

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Nov. 22, 2024

This study aimed to develop and characterize novel biocomposites incorporating tall oil fatty acid (TOFA)-modified lignin (TeL), citric acid-esterified polyvinyl alcohol (CeP), unbleached fibers (UNB) enhance thermal mechanical properties while utilizing renewable resources. The research addressed the growing demand for sustainable high-performance materials in various industrial applications. Kraft was modified through esterification with TOFA, (PVA) crosslinked using acid. These components were combined UNB create varying compositions. characterized Fourier-transform infrared spectroscopy (FTIR), dynamic analysis (DMA), thermogravimetric (TGA), tensile strength testing. FTIR confirmed successful of PVA, evidenced by a strong ester carbonyl peak at 1730 cm⁻1. DMA results revealed significant improvements viscoelastic properties, highest glass transition temperature (Tg) 179.47 °C observed sample containing maximum TeL CeP content. TGA demonstrated enhanced stability, samples higher content exhibiting increased char formation residual masses up 47% 500 °C. Mechanical testing showed correlation between composition performance, optimal formulation (TeL12-CeP4-UNB4) achieving 8.7 MPa modulus 59.3 MPa. Potential applications these include alternatives packaging, automotive components, building or insulation, electronic devices other industries where are required. present viable option replacing conventional petroleum-based polymers, contributing advancement eco-friendly solutions.

Language: Английский

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Lignin valorisation: Life Cycle Assessment (LCA) considerations for enabling Circular Bioeconomy

International Journal of Sustainable Energy, Journal Year: 2023, Volume and Issue: 42(1), P. 1008 - 1027

Published: Aug. 31, 2023

Lignin constitutes the sole renewable aromatic resource found in abundance on Earth and does not call into question ethics of diverting land from food to energy production. In view that, potential lignocellulosic biomass promoting Circular Economy Bioeconomy concepts future biorefinery operations is widely acknowledged. Biorefineries can convert high-value products, lessen their environmental effect, hasten advent a sustainable by incorporating cutting-edge technologies doing thorough Life Cycle Assessment analysis. However, converting lignin added-value products challenging field technological, environmental, economic perspectives.This work set out determine most critical aspects expected provide reliable evidence support valorisation routes that enable production value-added bioenergy. Findings necessary knowledge for decision-making biorefineries aligned with concept, like how relating facilitated. HighlightsEnvironmental burdens lignin-derived due complex structureA limited number LCA studies productsFuture lignin-based development should be assessed using holistic, approachesLCA methodologies performance promising routesControversial under conceptRaised concerns as result fraction high demandIdentified controversial linking adverse impacts

Language: Английский

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