Thermal, mechanical, and structural properties of zno/polyethylene membranes made by thermally induced phase separation method

In this study, polysulfone (PSf)/silver-doped carbon nanotube (Ag-CNT) nanocomposite membranes were prepared by a phase-inversion technique; they were characterized and evaluated for fouling-resistant applications with bovine serum albumin (BSA) solutions. Carbon nanotubes were doped with silver nanoparticles via a wet-impregnation technique. The prepared Ag-CNT nanotubes were characterized with scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy, X-ray diffraction, Raman spectroscopy, and thermogravimetric analysis. The fabricated flat-sheet PSf/Ag-CNT nanocomposite membranes with different Ag-CNT loadings were examined for their surface morphology, roughness, hydrophilicity, and mechanical strength with SEM, atomic force microscopy, contact angle measurement, and tensile testing, respectively. The prepared composite membranes displayed a greater rejection of BSA solution (90%) and water flux stability during membrane compaction with a 10% reduction in water flux values (up to 0.4% Ag-CNTs) than the pristine PSf membrane. The PSf nanocomposite membrane with a 0.2% Ag-CNT loading possessed the highest flux recovery of about 80% and the lowest total membrane resistance of 56% with a reduced irreversible fouling resistance of 21%.

Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 66%

Fabrication of polysulfone nanocomposite membranes with silver‐doped carbon nanotubes and their antifouling performance

Khalid

Ibrahim

Hamouz

et al. 2016

“…This will lead to an increase in the distance between the large PMIA macromolecules and a decrease in the interaction between the PMIA macromolecules. Under the external force, the relative slippage of the macromolecules is likely to occur, resulting in a decrease in the mechanical properties of the membrane …”

Section: Resultsmentioning

confidence: 99%

Preparation and application of zinc oxide/poly(m‐phenylene isophthalamide) hybrid ultrafiltration membranes

Sun

Chen

Ren

et al. 2019

A small molecular‐weight cut‐off (MWCO) of 6000 Da poly(m‐phenylene isophthalamide) (PMIA) embedded zinc oxide (ZnO) hybrid ultrafiltration (UF) membrane was synthesized via nonsolvent‐induced phase separation (NIPS). Tests of field emission scanning electron microscope (FE‐SEM), energy dispersive X‐ray spectroscopy (EDX), atomic force microscopy (AFM), thermal gravimetric analyzer (TGA), Fourier transform infrared (FTIR), capillary flow porometer (CPF), mechanical test, and pure water flux (PWF) for characterization of membranes were carried out. The EDX, FTIR, and TGA indicated the presence of ZnO in the polymer matrix. The hybrid membranes showed enhanced pore density, PWF by the presence of the particles. The contact angle and water flux of modified membrane with 0.03 wt % of nano‐ZnO were 47.7° and 52.58 L·m−2·h−1 compared to 71.6° and 36.27 L·m−2·h−1 respectively; Compared with the hydrophobic membrane, the PMIA membrane, with hydrophilicity, is supposed to exhibit good antifouling properties. Furthermore, the thermal stability and mechanical properties of the modified membranes were increased. Finally, the hybrid membrane was used in treating papermaking white wastewater and exhibited good separation and high water flux. The great properties of the ultrafiltration PMIA membranes indicate their potential for excellent performance in industrial applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47583.

“…Melting point ( T m ), crystallization temperature ( T c ), and specific heat capacity ( C p ) were obtained from DSC curves. The degree of crystallinity ( χ c ) of the samples was determined as follow:

χ_{c} = \frac{{Δ H}_{normalm}}{{Δ H}_{m}^{°} ((), 1 - ϕ_{f})} \times 100

where, ϕ f is the mass composition of filler in the samples, ΔH m is the enthalpy of melting, and

{Δ H}_{m}^{°}

is the melting enthalpy of 100% crystalline polyethylene which was obtained from literature

{Δ H}_{m}^{°} = 293

J/g . Surface hydrophilicity of the fabricated membranes was evaluated by contact angle measurement (PG‐X, Thwing‐Albert Instrument Co, Sweden) between the membrane surface and water droplet.…”

Section: Methodsmentioning

confidence: 99%

High‐density polyethylene membranes embedded with carboxylated and polyethylene glycol‐grafted nanodiamond to be used in membrane bioreactors

Kivi

Alinia

Jafarzadeh

et al. 2019

Self Cite

In this work, neat and modified nanodiamond (ND) particles were embedded into high-density polyethylene (HDPE) membranes to improve hydrophilicity and antifouling properties. The membranes were prepared via thermally induced phase separation (TIPS) method and used for pharmaceutical wastewater treatment in membrane bioreactors (MBR) system. To prevent the agglomeration of ND, it was modified using two methods: thermal carboxylation (ND-COOH) and grafting with polyethylene glycol (ND-PEG). Membranes with different concentration of ND-COOH and ND-PEG nanoparticles ranging from 0.00 to 1.00 wt % were prepared and characterized using a set of analyses including water contact angle, pure water flux, tensile strength, differential scanning calorimeter, field emission scanning electron microscopy, and energy dispersive X-ray spectroscopy. It was found that the optimum contents of ND-COOH and ND-PEG nanoparticles were 0.50 wt % and 0.75 wt %, respectively. The interfacial interaction between nanoparticles and HDPE matrix was studied based on Pukanzsky model. To examine the performance of membranes, critical flux, filtration experiment in the MBR, and fouling analysis of membranes were carried out. The results showed that among the fabricated membranes, 0.75 wt % HDPE/ND-PEG membrane had the highest water flux and the best antifouling properties.