Bmimac

To prepare ionogels, the following reagents were used without additional purification: halloysite nanotubes (Sigma-Aldrich, New York, NY, USA), 1–3 µm in length and 30–70 nm in diameter; microcrystalline cellulose, Avicel type, with an average size of 20 μM (Sigma-Aldrich, Bethesda, MD, USA); ionic liquid 1-butyl-3-methylimidazolium acetate, BMImAc (Sigma-Aldrich, Darmstadt, Germany, purity ≥ 95%, water content ≤ 2.0%).
BMImAc was chosen as a component of the ionogel because it is considered an effective cellulose solvent [35 (link)].

BmimAc (≥95% purity) was obtained from
Sigma-Aldrich, and
cellulose powder (Vitacel L 00) was supplied by Mondele̅z International.
Full details of the cellulose powder including the degree of polymerization
are provided in the Supporting Information (Table S1). Cellobiose powder was obtained from BioServ UK limited.
MCT oil Miglyol 812 (caprylic/capric triglycerides⁶⁴ ) with a density of 0.945 g mL^–1 at 20
°C was obtained from Cremer Oleo GmbH & Co (Germany).

Cellulose (Baikal Cellulose and Paper Mill, Baikalsk, Russia) had a polymerization degree of 600 and contained 92% alpha-cellulose and less than 6% water. [EMIM]Ac, [EMIM]Cl, and [BMIM]Ac (Sigma-Aldrich, Steinheim, Germany) were used as ionic solvents, which were diluted with DMSO (Sigma-Aldrich) as a nominal co-solvent of cellulose. Non-woven polyester fabric (Crane Technical Materials, Pittsfield, MA, USA), which had a density of 87 g/m², a thickness of 90–99 μm, and an air permeability of 16.0–29.6 cm·s⁻¹·Pa⁻¹, was used as a micro-porous substrate for impregnating with cellulose solution and subsequent production of cellulose nanofiltration membranes. Distilled water, methanol, ethanol, and isopropanol (Himmed, Moscow, Russia) were used as non-solvents (precipitants), while hexane (Himmed) was applied for the post-processing of formed membranes. The transport properties of obtained cellulose membranes were investigated by using DMF (Sigma-Aldrich) with dissolved dyes Orange II (350 g/mol, Sigma-Aldrich) and Remazol Brilliant Blue R (626 g/mol, Sigma-Aldrich). All reagents were chemically pure and used without additional purification.