Magnetite-embedded cellulose fibers prepared from ionic liquid

Preparation of High Purity, High Molecular-Weight Chitin from Ionic Liquids for Use as an Adsorbate for the Extraction of Uranium from Seawater

“…Each syringe was used to dry-jet wet spin a spool of about 1 g of chitin fibers using techniques and equipment we have previously reported for chitin and cellulose. 8,18 Each spool of chitin fibers was washed with DI water and further soaked for 1-2 days to remove any residual IL. One spool of the chitin fibers (designated SS fibers) was removed and air dried in air, while the remaining spools were kept in water until used in the next step.…”

Synthesis of the perdeuterated cellulose solvents 1‐ethyl‐3‐methylimidazolium acetate (EMIM‐OAc‐d14) and 1‐butyl‐3‐methylimidazolium acetate (BMIM‐OAc‐d18) and of 2‐13C‐butyl‐3‐methylimidazolium acetate

“…-CD 3 OD, -CO 2 Scheme 1. Synthesis of perdeuterated 1-ethyl-3-methylimidazolium acetate (8) and 1-butyl-3-methylimidazolium acetate (9), employing dimethylcarbonate-d 6 as alkylating agent and precursor of a conveniently exchangeable anion. 13 C NMR spectra at 100.42 MHz in CDCl 3 as the solvent and TMS as the internal standard, if not stated otherwise.…”

“…50 mL), and the solids removed by filtration. The ether was evaporated and the viscous remaining solid was heated to 801C under vacuum, which provided a small amount of recovered dimethylcarbonate-d 6 (not quantified). Under ambient pressure and efficient stirring at 801C, acetic acid-d 4 (7, 0.5 g, 7.8 mmol) was added, upon which the clear liquid turned cloudy due to evolved gases.…”

“…[3][4][5] Studies are going on to use ILs for large-scale production of cellulosic fibers. 6,7 The swelling and dissolution of cellulose in ILs (and in other cellulose solvents as well) are still far from being understood on a molecular level. Direct solution studies by NMR are hampered by the unavailability of perdeuterated cellulose-dissolving ILs.…”

“…The resulting reaction mixture was colorless, which is not at all common for the syntheses of ILs that are mostly accompanied by chromophore generation. From the intermediates 1-ethyl-3-methylimidazolium methylcarbonate-d 14 (5) and 1-butyl-3-methylimidazolium methylcarbonate-d 18 (6), excess dimethylcarbonate-d 6 was removed under vacuum; non-reacted 1-alkylimidazole was not detected.…”