Novel β-CD@ZIF-8 Nanoparticles-Doped Poly(m-phenylene isophthalamide) (PMIA) Thin-Film Nanocomposite (TFN) Membrane for Organic Solvent Nanofiltration (OSN)

Abstract

Organic solvent nanofiltration (OSN) membranes are always troubled by the “trade-off” effect between solvent flux and solute rejection. Hence, a rapid, convenient, and effective way to synthesize novel β-cyclodextrin-enhanced zeolite imidazole framework-8 (β-CD@ZIF-8) nanoparticles was first proposed and the nanoparticles were doped into both selective layer and poly(m-phenylene isophthalamide) support for fabricating thin-film nanocomposite membranes. Transmission/scanning electron microscopy images and X-ray photoelectron spectroscopy results demonstrate the successful synthesis of β-CD@ZIF-8. Atomic force microscopy images illustrate the more rougher surface compared to the pristine membrane, while the pure acetone flux reached 62.3 ± 2.3 L m–2 h–1, and Rose Bengal rejection achieved 96.6 ± 1.8 and 94.5 ± 0.5% in methanol (MeOH) and tetrahydrofuran at 0.6 MPa, respectively, when the dosage was 0.05% (w/v). The molecular weight cutoff around 574 Da of PPA2505 containing β-CD@ZIF-8 in both support and selective layers shows the optimum properties and outstanding OSN performances in erythromycin concentration and purification in MeOH and butyl acetate. Additionally, polyimide nanofiber and the formed net structure may offer a potential way to fabricate “ultrathin” film in the OSN industry.

High performance polyvinylidene fluoride (PVDF) mixed matrix membrane (MMM) doped by various zeolite imidazolate frameworks

“…The membrane showed a good pure water flux, good NaCl interception rate and excellent mechanical properties. The hydrophilic ZIF-8 modified PSF ultrafiltration membrane was prepared by Xu et al 31 The results indicated that ZIF-8 greatly enhanced the permeability and anti-pollution performance of PSF membrane. Efficient removal of nickel (II) from high salinity wastewater by a novel PAA/ZIF-8/PVDF composite ultrafiltration membrane was fabricated by Yang et al 32 The resulted membrane has the highest adsorption capacity to high salt wastewater.…”

Novel thin‐film nanocomposite membrane with water‐soluble polyhydroxylated fullerene for the separation of Mg2+/Li+ aqueous solution

“…Surface hydrophilicity was reflected by 180‐s dynamic water contact angle (DCA, θ ) curves, which were estimated by a metre (JC2000A, Shanghai Zhong Cheng, China) …”

Metal−Organic Frameworks for Liquid Phase Applications

“…Several adjustable parameters were identified such as the concentration of PMIA in support, the contents of aqueous and organic phases, and the dosage of β ‐CD@ZIF‐8 nanoparticles to improve membrane performance. [ 233 ] Navarro et al. reported a novel procedure for positioning a monolayer of hydrophilic MIL‐101(Cr) nanoparticles in TFN membranes.…”

“…to improve membrane performance. [233] Navarro et al reported a novel procedure for positioning a monolayer of hydrophilic MIL-101(Cr) nanoparticles in TFN membranes. As described in Figure 24, it was achieved by transferring a Langmuir-Schaefer (LS) film of MIL-101(Cr) between a top polyamide thin layer and a bottom cross-linked asymmetric polyimide (P84) support.…”