Divalent heavy metal ions removal from contaminated water using positively charged membrane prepared from a new carbon nanomaterial and HPEI

Tofighy, Maryam Ahmadzadeh; Mohammadi, Toraj

doi:10.1016/j.cej.2020.124192

Cited by 96 publications

(30 citation statements)

References 91 publications

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“…Furthermore, the more or less attractive or repulsive effect of the NF-PANZr membrane on ion rejection was highlighted in the analysis of the results produced by the Runge–Kutta model. The charge of the membrane plays a very important role in the transport of ions through the membrane active layer, and several recent studies confirm this propensity of the membrane to attract and allow itself to be more easily crossed by ions of a charge contrary to its charge [ 8 , 31 , 32 , 33 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

Runge–Kutta Numerical Method Followed by Richardson’s Extrapolation for Efficient Ion Rejection Reassessment of a Novel Defect-Free Synthesized Nanofiltration Membrane

et al. 2021

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A defect-free, loose, and strong layer consisting of zirconium (Zr) nanoparticles (NPs) has been successfully established on a polyacrylonitrile (PAN) ultrafiltration substrate by an in-situ formation process. The resulting organic–inorganic nanofiltration (NF) membrane, NF-PANZr, has been accurately characterized not only with regard to its properties but also its structure by the atomic force microscopy, field emission scanning electron microscopy, and energy dispersive spectroscopy. A sophisticated computing model consisting of the Runge–Kutta method followed by Richardson extrapolation was applied in this investigation to solve the extended Nernst–Planck equations, which govern the solute particles’ transport across the active layer of NF-PANZr. A smart, adaptive step-size routine is chosen for this simple and robust method, also known as RK4 (fourth-order Runge–Kutta). The NF-PANZr membrane was less performant toward monovalent ions, and its rejection rate for multivalent ions reached 99.3%. The water flux of the NF-PANZr membrane was as high as 58 L·m−2·h−1. Richardson’s extrapolation was then used to get a better approximation of Cl− and Mg2+ rejection, the relative errors were, respectively, 0.09% and 0.01% for Cl− and Mg2+. While waiting for the rise and expansion of machine learning in the prediction of rejection performance, we strongly recommend the development of better NF models and further validation of existing ones.

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Section: Resultsmentioning

confidence: 99%

Runge–Kutta Numerical Method Followed by Richardson’s Extrapolation for Efficient Ion Rejection Reassessment of a Novel Defect-Free Synthesized Nanofiltration Membrane

et al. 2021

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“…85 As can be observed, the intensity ratio of I D /I G for the GONRs increases compared to that for the MWCNTs, which confirms unzipping and oxidation of the MWCNTs and formation of the GONRs. 8,45,84 As can be observed, the porosity of the membranes containing PVP (M 2 and M 7 ) is higher than that of the membranes without PVP (M 1 and M 3 ). Also, a large number of pores can be observed on the surface of M 2 and M 7 .…”

Section: Characterization Of Gonrsmentioning

confidence: 93%

“…In general, the lower WCA value indicates that the membrane surface is more hydrophilic in nature. 8 In addition to the surface hydrophilicity, the WCA is also related to surface pore size and surface morphology. The WCA comparison between the PVDF (M 1 ), PVDF/PVP (M 2 ), PVDF/(0.5GONRs) (M 3 ), and PVDF/(0.5GONRs)/PVP (M 7 ) membranes is shown schematically in Figure 10.…”

Section: Characterization Of Pvdf/gonrs/ Pvp Nanocomposite Membranesmentioning

confidence: 99%

“…[1][2][3][4][5] Over the past few years, membrane separation technology has received great attention as one of the most promising methods for water and wastewater treatment and producing high quality water. [6][7][8][9][10] Polymeric membranes with robust chemical, mechanical and thermal stabilities and ability to effectively remove contaminants are commonly used in water and wastewater treatments. 11,12 The trade-off relationship between selectivity and permeability as well as membrane fouling is critical issues in the application of polymeric membranes in water and wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

“…36,38,[46][47][48][49][50][51][52][53][54][55] Carbon nanomaterials, such as GO and CNTs with outstanding properties, have attracted considerable attention. 8,44,[56][57][58] Carbon nanomaterials can be used as nanofillers to produce nanocomposite membranes. As reported in the literature, [59][60][61][62][63] by adding small amounts of carbon nanomaterials to the polymer matrix, less than 2 wt%, the performance of the prepared nanocomposite membranes could be effectively enhanced.…”

Section: Introductionmentioning

confidence: 99%

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High‐flux PVDF/PVP nanocomposite ultrafiltration membrane incorporated with graphene oxide nanoribbones with improved antifouling properties

Tofighy

Mohammadi

Sadeghi

2020

J of Applied Polymer Sci

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A novel polyvinylidene fluoride (PVDF) nanocomposite membrane containing graphene oxide nanoribbones (GONRs) as a new nanofiller and polyvinylpyrrolidone (PVP) as pore former agent was prepared via phase inversion method. GONRs were prepared by oxidative unzipping of multi-walled carbon nanotubes (MWCNTs) via chemical approach. Chemical vapor deposition method was used to synthesis MWCNTs. The effects of adding GONRs and PVP into the casting solution on morphology, hydrophilicity and pure water flux (PWF) of the prepared nanocomposite membranes were explored. Antifouling experiments were also performed. It was found that compared to the neat PVDF membrane, PWF of the PVDF/PVP, PVDF/(0.5GONRs) and PVDF/(0.5GONRs)/PVP membranes were improved 80%, 44.9%, and 241.6%, respectively. The obtained results showed that GONRs and PVP exhibit synergistic effects in controlling the membrane properties. This work shows that GONRs can be suitable as nanofiller for preparation of high performance PVDF ultrafiltration membranes with improved antifouling properties.

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Electrospun Al ₂ O ₃ hydrophobic functionalized membranes for heavy metal recovery using direct contact membrane distillation

Khraisheh

Almomani

2020

Int J Energy Res

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In this study, styrene-butadiene-styrene (SBS) was used to develop a novel functionalized electrospun membrane for the effective treatment of heavy metals in direct contact membrane distillation (DCMD) applications. Functionalization was achieved by the addition (doping) of the super hydrophobic Al 2 O 3 nanoparticles (Al NPs) within the matrix of the membrane during electrospinning. Neat (pristine nondoped) and doped SBS membranes were tested. The performance of the SBS membranes were also compared with fabricated polyvinylidene fluoride membranes with and without doping with Al NPs. The membrane characteristics were tested via Fourier transform infrared, scanning electron microscopy, pore size, and porosity investigations. The wettability of the membranes was investigated with respect to the liquid entry pressure (LEP) and contact angle. The performance of the membranes was tested in a DCMD setting for its ability to treat water containing salt (NaCl) and heavy metals (Cr (VI), Cd, Pb) in various concentration in a single and multicomponent systems. The SBS member exhibited excellent hydrophobicity characteristics such as a high LEP (16.87 psi) and contact angle (141 ± 2 ). It also had superior permeate flux rate compared to the other prepared membranes (54.4 LMH). The addition of the Al 2 O 3 nanoparticles enhance the performance of the membranes substantially.Slight decline in the flux was observed after 14 hours of continuous operating time that could be attributed to agglomeration, adsorption, or temperature polarization effects. The SBS AL NPs membranes also demonstrated excellent flux for saline solutions of varied concentrations with 99% salt rejection.

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Divalent heavy metal ions removal from contaminated water using positively charged membrane prepared from a new carbon nanomaterial and HPEI

Cited by 96 publications

References 91 publications

Runge–Kutta Numerical Method Followed by Richardson’s Extrapolation for Efficient Ion Rejection Reassessment of a Novel Defect-Free Synthesized Nanofiltration Membrane

Runge–Kutta Numerical Method Followed by Richardson’s Extrapolation for Efficient Ion Rejection Reassessment of a Novel Defect-Free Synthesized Nanofiltration Membrane

High‐flux PVDF/PVP nanocomposite ultrafiltration membrane incorporated with graphene oxide nanoribbones with improved antifouling properties

Electrospun Al ₂ O ₃ hydrophobic functionalized membranes for heavy metal recovery using direct contact membrane distillation

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Divalent heavy metal ions removal from contaminated water using positively charged membrane prepared from a new carbon nanomaterial and HPEI

Cited by 96 publications

References 91 publications

Runge–Kutta Numerical Method Followed by Richardson’s Extrapolation for Efficient Ion Rejection Reassessment of a Novel Defect-Free Synthesized Nanofiltration Membrane

Runge–Kutta Numerical Method Followed by Richardson’s Extrapolation for Efficient Ion Rejection Reassessment of a Novel Defect-Free Synthesized Nanofiltration Membrane

High‐flux PVDF/PVP nanocomposite ultrafiltration membrane incorporated with graphene oxide nanoribbones with improved antifouling properties

Electrospun Al 2 O 3 hydrophobic functionalized membranes for heavy metal recovery using direct contact membrane distillation

Contact Info

Product

Resources

About

Electrospun Al ₂ O ₃ hydrophobic functionalized membranes for heavy metal recovery using direct contact membrane distillation