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Journal articleLuan S, Nisar S, Phipps J, et al., 2025,
Optimization of the ionoSolv process for the preservation of pulp fibre dimensions
, INDUSTRIAL CROPS AND PRODUCTS, Vol: 236, ISSN: 0926-6690 -
Journal articleArtime IF, Al Ghatta A, Ouitrakoon P, et al., 2025,
Surfactant-assisted ionic liquid fractionation of spruce produces a low molar weight and less condensed lignin
, INDUSTRIAL CROPS AND PRODUCTS, Vol: 235, ISSN: 0926-6690 -
Journal articleWesinger S, Rabiner A, Meyer N, et al., 2025,
Sequential fractionation and polyoxometalate‐catalyzed oxidation of lignocellulosic biomass improves cellulose purity and formic acid yield
, Biofuels, Bioproducts and Biorefining, Vol: 19, Pages: 1862-1874, ISSN: 1932-104XLignocellulosic biomass is an important source of renewable chemicals and materials but its full valorization is necessary in order to achieve economic and sustainability goals. This study proposes a two-step approach for the valorization of lignocellulosic biomass combining solvent-assisted fractionation and catalytic oxidation with molecular oxygen to generate cellulose and formic acid. An industrially relevant lignocellulosic substrate, beech wood, was fractionated under a nitrogen atmosphere using either an organosolv (methanol or ethanol) or ionosolv (ionic liquid) aqueous solvent to produce dissolved hemicellulose and lignin as well as a cellulose-rich solid. The dissolved components were oxidized catalytically to formic acid and its derivatives in a second step using the fivefold vanadium substituted Keggin-type polyoxometalate H8[PV5Mo7O40]. Enzymatic hydrolysis of the cellulose-enriched solid generated purified glucose higher in yields than the single-step comparison method. The organosolv-fractionation increased enzymatic saccharification to 78% whereas the ionosolv-fractionation increased the saccharification yield to 68%, in comparison with 18% for the one-step conversion and only 8% for the untreated beech wood. In the oxidation step, a 28% formic acid yield was achieved under 125 °C, 1200 rpm, 30 bar oxygen, and 6.5 h reaction conditions. The improvements observed for the two-step approach are attributed to the influence of the solvent on the catalyst preventing the latter from interacting with the cellulose-enriched solid, which improved the quality of the pulp and increased the overall formic acid yield.
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Journal articleWang W, Nakasu PYS, Costa JM, et al., 2025,
Pectin Extracted by a Recyclable Molecular Mixture: A Promising Material for Porous Membranes in Quasi-Solid-State Na-Ion Batteries
, ACS SUSTAINABLE CHEMISTRY & ENGINEERING, Vol: 13, Pages: 18061-18074, ISSN: 2168-0485 -
Journal articleWesinger S, Rabiner A, Nisar S, et al., 2025,
Boosting POM-ionosolv biorefining of lignocellulosic biomass by using redox-balanced polyoxometalate catalysts in methanolic ionic liquid reaction media
, ChemSusChem, Vol: 18, ISSN: 1864-5631This article presents an advanced iteration of the polyoxometalate (POM)-Ionosolv concept to generate biobased methyl formate in high yield and a bleached cellulose pulp from lignocellulosic biomass in a single-step operation by using redox-balanced POM catalysts and molecular oxygen in alcoholic ionic liquid (IL) mixtures. The performance of the three Ionosolv-ILs triethylammonium hydrogen sulfate ([TEA][HSO4]), N,N-dimethylbutylammonium hydrogen sulfate ([DMBA][HSO4]), and tributylmethylphosphonium methyl sulfate ([TBMP][MeSO4]), mixed with methanol (MeOH) (30/70 wt%), is evaluated by methyl formate yield from extracted hemicellulose and lignin as well as purity of the bleached cellulose pulp in the presence of various Keggin-type POMs. The redox-balanced H8PVMnMo10O40 POM catalyst in [TBMP][MeSO4]/MeOH emerge as the most effective combination, achieving 20% methyl formate yield from commercial beech wood. The glucan content in the bleached cellulose-enriched solid consisted is over 90%, demonstrating that the use of MeOH drastically improved lignin extraction in parallel with full hemicellulose extraction. The cellulose is highly susceptible to enzymatic hydrolysis, generating a pure and concentrated cellulosic glucose stream. The formed solid catalyst complex is examined in detail to reveal its chemical nature as POM-IL-complex. The approach is applicable to disparate types of lignocellulosic biomass, including hardwood, softwood, and grass.
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Journal articleNisar S, Barbará PV, Chachuat B, et al., 2025,
Near-infrared spectroscopy for rapid compositional analysis of cellulose pulps after fractionation with ionic liquids
, Biomass and Bioenergy, Vol: 201, ISSN: 0961-9534The composition of cellulose-enriched solids is typically monitored using a laborious and expensive wet-lab analytical method. Here, the development and application of an alternative tool that uses NIR spectroscopy and a software sensor is reported, drawing on a large data set (149 training samples) consisting of untreated grass, hardwood, and softwood biomass and cellulose pulps obtained after fractionation with the low-cost ionic liquids triethylammonium hydrogen sulfate ([TEA][HSO4]) or N,N-dimethylbutylammonium hydrogen sulfate ([DMBA][HSO4]) mixed with water. A partial least squares (PLS) model was trained on compositions determined with the traditional wet-lab procedure, followed by the application of an uncertainty quantification framework to estimate confidence in the predictions. Good agreement with the wet-lab experimental data (mean absolute errors on unseen samples below 5%) was found for ionic liquid fractionated cellulose and purified cellulose samples generated with non-ionoSolv approaches. Cellulose with low crystallinity and isolated lignins generated poor fits, suggesting that more specialised models are needed. The sugar-derived pseudo-lignin (humin) content in the cellulose pulp was estimated by comparing the model with a second PLS model that excluded charred (over-treated) pulps. The study shows that NIR soft-sensors can cost- and time-effectively estimate the composition of ionoSolv-based pulps, speeding up process and product development and facilitating process operation.
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Journal articleSuleman MY, Judah HL, Bexis P, et al., 2025,
The acetate anion promotes hydrolysis of poly(ethylene terephthalate) in ionic liquid-water mixtures
, GREEN CHEMISTRY, Vol: 27, Pages: 11475-11490, ISSN: 1463-9262 -
Journal articlePolesca C, Sobreiro-Almeida R, Passos H, et al., 2025,
Engineered from Waste: Ionic Liquid Processing of Keratin for 3D Printing Biomedical Scaffolds
, ACS MATERIALS LETTERS -
Journal articleNakasu PYS, Martinez MA, Melanie S, et al., 2025,
Chitosan-Based Biocomposite Hydrogels with Squid Pen Protein for Anionic Dyes Adsorption (vol 7, pg 1012, 2025)
, ACS MATERIALS LETTERS -
Journal articleAljohani M, Lan L, Daly H, et al., 2025,
Enhancing Hydrogen Production from Bioenergy Crops via Photoreforming
, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 147, Pages: 29679-29686, ISSN: 0002-7863
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