Ancillary effects of surfactants on filtration of low molecular weight contaminants through cellulose nitrate membrane filters

Olcay, Aybike Nil; Polat, Mehmet; Polat, Hürriyet

doi:10.1016/j.colsurfa.2015.12.032

Cited by 14 publications

(2 citation statements)

References 22 publications

(18 reference statements)

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“…The water flux results showed that the PAN has a low hydraulic resistance relative to the change in the layer thickness. In the case of a thinner membrane, a lower permeate flux can be achieved primarily due to lower mass transfer resistance and shorter overall transport path [63,64]. This finding is similar to the studies by Liu et al (2013), which have reported that with an increasing thickness of electrospun PVA membrane from 20 to 40 μm, the pure water flux was decreased from 7382 ± 462 to 4767 ± 457 Lm −2 h −1 .…”

Section: Effect Of Membrane Thicknesssupporting

confidence: 86%

Arsenate removal from aqueous solutions using micellar-enhanced ultrafiltration

Bahmani

Maleki

Rezaee

et al. 2019

J Environ Health Sci Engineer

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In this study, arsenate (As-V) removal using micellar enhanced ultrafiltration (MEUF) modified by cationic surfactants was studied by a dead-end polyacrylonitrile (PAN) membrane apparatus. The UF membrane has been produced by a phase inversion process. The prepared membrane was characterized and analyzed for morphology and membrane properties. The influence of operating parameters such as initial concentrations of As-V, surfactants, pH, membrane thickness, and co-existing anions on the removal of As-V, surfactant rejection, and permeate flux have been studied. The experimental results show that from the two different cationic surfactants used the CPC (cetyl-pyridinium chloride) efficiency (91.7%) was higher than that of HTAB (hexadecyltrimethyl-ammonium bromide) (83.7%). The highest As-V removal was 100%, and was achieved using initial feed concentrations of 100-1000 μg/L , at pH 7 with a membrane thickness of 150 μm in a dead-end filtration system. This efficiency for As-V removal was similar to that obtained using a cross-flow system. Nevertheless, this flux reduction was less than the reduction achieved in the dead-end filtration process. The PAN fabricated membrane in comparison to the RO and NF processes selectively removed the arsenic and the anions, in the water taken from the well, and had no substantial effect on the cations.

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Section: Effect Of Membrane Thicknesssupporting

confidence: 86%

Arsenate removal from aqueous solutions using micellar-enhanced ultrafiltration

Bahmani

Maleki

Rezaee

et al. 2019

J Environ Health Sci Engineer

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“…Nitrocellulose (NC) is the nitration product of cellulose that can be dissoluble in some organic solvents, such as ethyl acetate and acetone. In spite of its excellent membrane-forming performance and its applications in surface coating industries [26][27][28][29][30], little research appeared in the literature dealing with the graft copolymerization of NC by vinyl monomer until grafting of methyl methacrylate onto NC had been reported [31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Photochromic Performance of Homogeneous Phase Nitrocellulose Membrane Grafting Spirooxazine Moieties

Sun

Yao

et al. 2020

Coatings

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The synthesis of 1,3,3-trimethyl-9′-acryloxyspiro[indoline-2,3′(3H)naphtho[2,1-b][l,4]-oxazine] (AISO) was carried out by catalytic esterification of 1,3,3-trimethyl-9′-hydroxyspiro-[indoline-2,3′(3H)naphtho[2,1-b][l,4]oxazine] (SO–OH) and acrylic acid in the presence of 1,3-dicyclohexylcarbodiimide (DCC) and N-dimethylaminopyridine (DMAP). Then, the synthesis of the target copolymer (NC-g-AISO) was was carried out by benzoyl peroxide (BPO)-induced graft copolymerization of the AISO monomer onto nitrocellulose (NC) in a homogeneous methyl isobutyl ketone medium. The structure of NC-g-AISO was characterized by Fourier transform infrared (IR) spectroscopy, 13C Nuclear Magnetic Resonance (NMR) spectra and thermogravimetric (TG) analysis. The photochromic properties of NC-g-AISO were investigated by examining UV–Vis spectra in ethyl acetate solution and solid membrane. Compared with the AISO monomer in ethyl acetate solution, the thermal color decay stability of the colored form of NC-g-AISO in ethyl acetate solution and in solid membrane improved significantly. The thermal color decay reaction rate constants in ethyl acetate solution and membrane at 25 °C were 1.77 × 10–2 and 1.36 × 10–3 s–1, respectively, fitted using the first-order reaction equation. After ten photochromic cycles, the relative absorption intensity of the colored form of NC-g-AISO decreased by 0.85%, indicating that the NC-g-AISO membrane has good reversible photochromic behavior.

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