Industrial Crops and Products, Год журнала: 2022, Номер 186, С. 115275 - 115275
Опубликована: Июнь 30, 2022
Язык: Английский
Journal of Liquid Chromatography & Related Technologies, Год журнала: 2025, Номер unknown, С. 1 - 8
Опубликована: Фев. 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.
Язык: Английский
Процитировано
0
International Journal of Biological Macromolecules, Год журнала: 2025, Номер 306, С. 141744 - 141744
Опубликована: Март 4, 2025
Язык: Английский
Процитировано
0
Опубликована: Янв. 1, 2025
Язык: Английский
Процитировано
0
Comptes Rendus Chimie, Год журнала: 2025, Номер 28(G1), С. 327 - 338
Опубликована: Март 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
Язык: Английский
Процитировано
0
Опубликована: Янв. 1, 2025
Язык: Английский
Процитировано
0
Topics in Catalysis, Год журнала: 2025, Номер unknown
Опубликована: Апрель 28, 2025
Язык: Английский
Процитировано
0
Catalysis Letters, Год журнала: 2023, Номер 154(4), С. 1537 - 1546
Опубликована: Июль 5, 2023
Язык: Английский
Процитировано
7
Chemie Ingenieur Technik, Год журнала: 2024, Номер 96(4), С. 418 - 431
Опубликована: Март 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.
Язык: Английский
Процитировано
2
Scientific Reports, Год журнала: 2024, Номер 14(1)
Опубликована: Ноя. 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.
Язык: Английский
Процитировано
2
International Journal of Sustainable Energy, Год журнала: 2023, Номер 42(1), С. 1008 - 1027
Опубликована: Авг. 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
Язык: Английский
Процитировано
5