Novel hydrophilic PVDF ultrafiltration membranes based on a ZrO2–multiwalled carbon nanotube hybrid for oil/water separation

Yang, Xi; He, Yi; Zeng, Guangyong; Zhan, Yingqing; Yang, Piaoping; Shi, Heng; Chen, Qi

doi:10.1007/s10853-016-0147-6

Cited by 47 publications

(13 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason for this tendency was attributed to two points. On one hand, the presence of the CNTs reduced the surface free energy and the interfacial energy of the membranes . On the other hand, the CNTs in the membrane pores increased the total surface area, and the bare carboxyl groups on the CNTs attracted water molecules .…”

Section: Resultsmentioning

confidence: 99%

“…J and R , were defined by eqs. () and (), respectively:

J = \frac{V}{A \times t}

R (%) = (1 - \frac{C_{f}}{C_{0}}) \times 100 %

where V is the volume of permeation water (L), A is the effective area of the membrane (m 2 ), t is the filtration time (h), and C 0 and C f are the concentrations of the BSA aqueous solution before and after filtration (mg/L), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The flux recovery ratio (FRR) was calculated with eq. ():

FRR = \frac{J_{w 2}}{J_{w 1}} \times 100 %

where J ω2 is the pure water flux after the BSA rejection test (L m −2 h −1 ) and J ω1 is the pure water flux of the first test (L m −2 h −1 ).…”

Section: Methodsmentioning

confidence: 99%

“…Poly(vinylidene fluoride) (PVDF) is widely used in membrane products because of its good chemical resistance, high mechanical strength, and excellent thermal stability . PVDF has been broadly applied in the fields of wastewater treatment, membrane contactors, membrane distillation, and so on. However, because of the hydrophobic properties of PVDF membranes, they easily accumulate dirt in the filtration process; this can decrease the membrane efficiency and increase the cost of membrane cleaning .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Poly(vinylidene fluoride)–polyacrylonitrile blend flat‐sheet membranes reinforced with carbon nanotubes for wastewater treatment

Gao

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this reported study, poly(vinylidene fluoride) (PVDF) and polyacrylonitrile (PAN) blend flat-sheet membranes were prepared via a phase-inversion method with various loadings of multiwalled carbon nanotubes. The effects of the carbon nanotubes (CNTs) on the performance and morphology of the PVDF-PAN composites were investigated via tests of the pure water flux and rejection of bovine serum albumin, scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and contact angle (CA) analysis. The experimental results demonstrate that the CNTs contributed to the improvement of the flux and hydrophilicity of the membranes. The maximum value of the flux was 398.1 L m 22 h 21 , and the value of CA for the composite membranes was found to be 488. In addition, the results of the mechanical properties tests illustrate that the brittleness and plasticity of the hybrid membranes were greatly improved by the presence of the CNTs. The flux recovery ratio was maintained at 75%; this demonstrated that the PVDF-PAN membranes enhanced with the CNTs possessed good antifouling performance.Polyacrylonitrile (PAN) is also a common microfiltration and ultrafiltration membrane material by virtue of its chemical stability, thermal stability, low cost, and tolerance to organic solvents. 5,32 The molecular structures of PVDF and PAN are Additional Supporting Information may be found in the online version of this article.

show abstract

Section: Resultsmentioning

confidence: 99%

“…J and R , were defined by eqs. () and (), respectively:

J = \frac{V}{A \times t}

R (%) = (1 - \frac{C_{f}}{C_{0}}) \times 100 %

Section: Methodsmentioning

confidence: 99%

“…The flux recovery ratio (FRR) was calculated with eq. ():

FRR = \frac{J_{w 2}}{J_{w 1}} \times 100 %

where J ω2 is the pure water flux after the BSA rejection test (L m −2 h −1 ) and J ω1 is the pure water flux of the first test (L m −2 h −1 ).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Poly(vinylidene fluoride)–polyacrylonitrile blend flat‐sheet membranes reinforced with carbon nanotubes for wastewater treatment

Gao

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…A variety of methods including electrolysis, catalytic degradation, ion exchange, membrane filtration, and adsorption have been proposed for the expelling of contaminants [10][11][12][13][14][15]. Most of them have been found to be limited due to cost, efficiency, and complexity.…”

Section: Introductionmentioning

confidence: 99%

Diverse Surface Chemistry of Cobalt Ferrite Nanoparticles to Optimize Copper(II) Removal from Aqueous Media

et al. 2020

View full text Add to dashboard Cite

Water pollution by heavy metals is one of the most serious worldwide environmental issues. With a focus on copper(II) ions and copper complex removal, in the present study, ultra-small primary CoFe2O4 magnetic nanoparticles (MNPs) coated with octadecylamine (ODA) of adequate magnetization were solvothermally prepared. The surface modification of the initial MNPs was adapted via three different chemical approaches based on amine and/or carboxylate functional groups: (i) the deposition of polyethylimide (PEI), (ii) covalent binding with diethylenetriaminepentaacetic acid (DTPA), and (iii) conjugation with both PEI and DTPA, respectively. FT-IR, TGA, and DLS measurements confirmed that PEI or/and DTPA were successfully functionalized. The percentage of the free amine (−NH2) groups was also estimated. Increased magnetization values were found in case of PEI and DTPA-modified MNPs that stemmed from the adsorbed amine or oxygen ligands. Comparative UV–Vis studies for copper(II) ion removal from aqueous solutions were conducted, and the effect of time on the adsorption capacity was analyzed. The PEI-modified particles exhibited the highest adsorption capacity (164.2 mg/g) for copper(II) ions and followed the pseudo-second-order kinetics, while the polynuclear copper(II) complex Cux(DTPA)y was also able to be immobilized. The nanoadsorbents were quickly isolated from the solution by magnetic separation and regenerated easily by acidic treatment.

show abstract

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Shalaby

Sołowski

Abbas

2021

Adv Materials Inter

View full text Add to dashboard Cite

found with other insoluble matter, presenting relevant problems with safe and convenient separation. The legal discharge of oil-water emulsions is a complex process. [4] Thus, environmental authorities have established stringent regulations to cope with it. [5] Depending on countries, the oil limits are concentrations below 40 ppm as in Vietnam, [6] and in other countries like Korea, the maximum is only five ppm of oil in discharge. [7] Generally, the oil phase in water has three forms, based on oil droplets, size of more than 150 micrometers is called free oil, but that size found from 50 to 150 micrometers is the dispersed oil, [8] finally, the emulsified oil less than 20 µm. There is an increasing interest in employing membrane technology for filtering smaller size oil droplets. In this review, oil-water emulsion problems are highlighted with oil-water separation techniques selection and their performance with varied oil concentration and composition of other immiscible or miscible components. [9] Membrane technology is known formerly to economically advantageous for oily wastewater (OWW) treatment compared with other conventional technologies. [9] Based on the literature, the membranebased treatment cost estimation was about 1 and 3 $ m −3 , [10] lower than for dissolved air floatation (DAF) treatment (cost was 3.65 $ m −3 ). Generally, the treatment cost depends on OWW sources, as each industry has its specific blends for oil and grease jointly with other membrane foulants. [11] For example, oil-water emulsions treatment from the fatty acid industry has a total capital cost (costs of membranes, electricity, labor, cleaning, and maintenance) of 2.65 $ m −3 , compared with the railroad industry (it was ranged from 1.03 to 1.48 $ m −3 ). These costs for the metalworking OWW using UF were 2.8 $ m −3 . In microfiltration (MF) membrane, the OWW membrane-based treatment for oil concentration of 50 ppm annual cost was estimated as 0.098 $ m −3 with a feed rate of 100 m 3 day −1 . [9] The cost of membrane-based treatment of OWW is generally varying but is lower than conventional technologies. [12] 1.1. Oil-Water Emulsions Sources, Environmental Hazard, and Discharge Limits An oil-water emulsion is either a waste stream product, or secondary product. These effluents are generated from different areas and industrial sectors like the petroleum& gas sector, food processing, shipping facilities and maritime, and many others Oily wastewater is generated by various industries in extraordinary growing volumes, such as oil refineries, petrochemicals, metallurgical, food & beverages, and dairy industries, which need oil removal for safe discharge to the environment. Lower cost of production with high oil removal and efficient performance compared to classical methods for treating oil-water emulsions attributed to the alleviation of operation. That emphasizes membrane modification to enhance wettability, hydrophilicity with the antifouling property such as membranes dealing with tiny oil emulsions to be the key parameters to im...

show abstract

Novel hydrophilic PVDF ultrafiltration membranes based on a ZrO2–multiwalled carbon nanotube hybrid for oil/water separation

Cited by 47 publications

References 49 publications

Poly(vinylidene fluoride)–polyacrylonitrile blend flat‐sheet membranes reinforced with carbon nanotubes for wastewater treatment

Poly(vinylidene fluoride)–polyacrylonitrile blend flat‐sheet membranes reinforced with carbon nanotubes for wastewater treatment

Diverse Surface Chemistry of Cobalt Ferrite Nanoparticles to Optimize Copper(II) Removal from Aqueous Media

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Contact Info

Product

Resources

About