Tailoring the molecular weight cut off values of polyacrylonitrile based hollow fibre ultrafiltration membranes with improved fouling resistance by chemical modification

Parashuram, K.; Maurya, Sandip; Rana, Harpalsinh H.; Singh, Puyam S.; Ray, Paramita; Reddy, A.V.R.

doi:10.1016/j.memsci.2012.09.013

Cited by 38 publications

(13 citation statements)

References 44 publications

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“…It was reported previously that PAN nanofibers could also hydrolyze in the presence of HCl at high temperature (140 ºC) and pressure (sealed in autoclave) [35] . A good number of functional groups could be obtained on the nanofiber surfaces after hydrolysis.…”

Section: Resultsmentioning

confidence: 99%

Preparation of α-Fe₂O₃/polyacrylonitrile nanofiber mat as an effective lead adsorbent

Chang

Wang

et al. 2016

Environ. Sci.: Nano

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α-Fe2O3 nanoparticle has been widely used in water purification because of its effective adsorption performance. However, aggregation and difficulty in separation limit its practical application. Herein, we presented a polyacrylonitrile (PAN) nanofiber mat decorated with α-Fe2O3 as adsorbent for effective removal of Pb 2+ from contaminated water, which can solve the above problems easily. The α-Fe2O3/PAN nanofiber mats were prepared via electrospinning followed by a facile hydrothermal method and characterized by SEM, HRTEM, FTIR and XRD. We demonstrated the formation mechanism of α-Fe2O3 anchored on PAN nanofiber surface consists of the adsorption of iron ions on the surface of PAN, and then the α-Fe2O3 nucleation and growth. The pH value of FeCl3 solution has a great impact on the formation process of α-Fe2O3/PAN nanofiber mat, which lead to the variation of morphology and the quantity of the coating coverage. When the pH value was 2.4, polyhedral particles were coated on PAN nanofibers uniformly and the optimized α-Fe2O3/PAN nanofiber mat was obtained. Controlled experiments were carried out to quantify the adsorption capacities of different samples and adsorption kinetics. The isotherm data from our experiments fitted well to the Langmuir model and the adsorption process can be described using the pseudo-second-model. Finally, the adsorption mechanism for Pb 2+ was investigated and the results revealed that ion exchange between proton of surface hydroxyl groups and Pb 2+ was accounted for the adsorption. Fig. 6 The effect of contact time on Pb 2+ adsorption capacity with different initial concentration (a), SEM image of α-Fe2O3/PAN (S2.4) after adsorption (b), the fitting results using pseudo first order (c), and pseudo second order (d) kinetic model.

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Section: Resultsmentioning

confidence: 99%

Preparation of α-Fe₂O₃/polyacrylonitrile nanofiber mat as an effective lead adsorbent

Chang

Wang

et al. 2016

Environ. Sci.: Nano

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“…As shown in the FTIR spectrum of the polyacrylonitrile membrane obtained from the pure water coagulation bath, the peaks at 2243 and 1737 cm −1 are related to the stretching vibration of nitrile (CN) and carbonyl (CO) groups in the acrylonitrile and vinyl acetate monomers, respectively . The peaks at 1452 cm −1 and 2938 cm −1 are due to the CH bending and stretching in CH 2 , respectively .…”

Section: Resultsmentioning

confidence: 94%

“…Figure shows the contact angle for the hydrolysis of modified and unmodified membranes. The contact angle is used to measure the relative hydrophilicity of the membrane surface . For the unmodified membrane, the contact angle is 72.8°.…”

Section: Resultsmentioning

confidence: 99%

“…Ultrafiltration PAN membranes are used for a variety of applications such as water purification, membrane bioreactors, pervaporation process, substrate for ultrafiltration (UF), microfiltration (MF), and composite reverse‐osmosis membranes . PAN has also received growing attention for its desirable thermal and mechanical properties, chemical stability, low cost and higher solvent resistance compared to other UF membranes, tolerance to most solvents and commercial availability . It is used as a fouling resistant material for aqueous filtrations due to its relatively hydrophilic properties .…”

Section: Introductionmentioning

confidence: 99%

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Enhanced modification technique for polyacrylonitrile UF membranes by direct hydrolysis in the immersion bath

Cheraghali

Maghsoud

2019

J of Applied Polymer Sci

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Conventional hydrolysis modification of polyacrylonitrile (PAN) membranes is usually carried out in a post-treatment step during which hydrophilic groups are created on the membrane surface. In this article, however, direct hydrolysis in the immersion bath is proposed as a new and simple approach for simultaneous membrane preparation and modification. The main advantages of this method include lower alkali concentrations, promptness, and the lack of need for elevating temperature compared to other studies. The cast films were immersed in the coagulation bath containing aqueous NaOH solutions of various concentrations (0.003, 0.0125, 0.025, 0.05, and 0.1 M) for 1, 3, 5, and 10 min, which were then transferred to a bath of pure water. Membranes were characterized by pure water flux, porosity, average pore diameter, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle, mechanical properties, rejection, and flux recovery ratio (FRR) measurements. At all treatment times, the pure water flux of modified membranes reached its maximum at low NaOH concentrations with a substantial increase (210%) in the membrane treated with 0.0125 M NaOH for 1 min. Furthermore, the kinetics of the hydrolysis reaction was considered to provide deeper insights into morphological changes occurring during the hydrolysis.

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“…Taguchi experimental design method is a type of fractional factorial design which uses an OA to study the influence of factors with only a small number of experiments. The design of experiment using Taguchi experimental design method provides a simple, effective and methodical approach to estimate the optimum operating conditions [21][22][23][24][25][26][27]. This method is based on several steps including planning of experimental matrix, executing experiments and the estimation of results.…”

Section: Experimental Designmentioning

confidence: 99%

Preparation and Performance Evaluation of Polyethersulfone Hollow Fiber Membranes for Ultrafiltration Processes

Salahi

Mohammadi

Behbahani

et al. 2015

Polymer-Plastics Technology and Engineering

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In this paper, polyethersulfone (PES) hollow fiber membranes were prepared using dryjet wet spinning process via phase inversion method. Effects of PES and PEG concentrations and CBT, AGD and TUS on morphology of the prepared membranes were investigated. Based on L 16 orthogonal array of Taguchi experimental design, 32 membranes were prepared. An experimental investigation on separation of industrial oil from oily wastewater has been done. The results showed that synthesized polyethersulfone (PES) membranes was effective and suitable for treatment of the oily wastewater to achieve up to 66.6, and 95.0% removal of TOC, and OGC, respectively, with flux of 72.3L/(m 2 h).

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Tailoring the molecular weight cut off values of polyacrylonitrile based hollow fibre ultrafiltration membranes with improved fouling resistance by chemical modification

Cited by 38 publications

References 44 publications

Preparation of α-Fe₂O₃/polyacrylonitrile nanofiber mat as an effective lead adsorbent

Preparation of α-Fe₂O₃/polyacrylonitrile nanofiber mat as an effective lead adsorbent

Enhanced modification technique for polyacrylonitrile UF membranes by direct hydrolysis in the immersion bath

Preparation and Performance Evaluation of Polyethersulfone Hollow Fiber Membranes for Ultrafiltration Processes

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Tailoring the molecular weight cut off values of polyacrylonitrile based hollow fibre ultrafiltration membranes with improved fouling resistance by chemical modification

Cited by 38 publications

References 44 publications

Preparation of α-Fe2O3/polyacrylonitrile nanofiber mat as an effective lead adsorbent

Preparation of α-Fe2O3/polyacrylonitrile nanofiber mat as an effective lead adsorbent

Enhanced modification technique for polyacrylonitrile UF membranes by direct hydrolysis in the immersion bath

Preparation and Performance Evaluation of Polyethersulfone Hollow Fiber Membranes for Ultrafiltration Processes

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Product

Resources

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Preparation of α-Fe₂O₃/polyacrylonitrile nanofiber mat as an effective lead adsorbent

Preparation of α-Fe₂O₃/polyacrylonitrile nanofiber mat as an effective lead adsorbent