Chelating polymer modified P84 nanofiltration (NF) hollow fiber membranes for high efficient heavy metal removal

Gao, Jie; Sun, Shi‐Peng; Zhu, Wenqing; Chung, Tai‐Shung

doi:10.1016/j.watres.2014.06.006

Cited by 252 publications

(72 citation statements)

References 34 publications

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“…Many technologies have been applied to treat heavy metal ions from wastewater [4,5], such as adsorption [6][7][8], chemical precipitation [9,10], ion exchange [11,12], and membrane process [13][14][15], etc. These methods have their advantages and disadvantages in treating heavy metal wastewater.…”

Section: Introductionmentioning

confidence: 99%

Studies on the optimum conditions using acid-washed zero-valent iron/aluminum mixtures in permeable reactive barriers for the removal of different heavy metal ions from wastewater

Han

Cheng

et al. 2016

Journal of Hazardous Materials

145

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Section: Introductionmentioning

confidence: 99%

Studies on the optimum conditions using acid-washed zero-valent iron/aluminum mixtures in permeable reactive barriers for the removal of different heavy metal ions from wastewater

Han

Cheng

et al. 2016

Journal of Hazardous Materials

145

View full text Add to dashboard Cite

“…Since the cross-linking reaction between polyethyleneimine (PEI) and polyimide substrates is simple and easy to be conducted with a ring opening reaction on the backbone of polyimide [33], this approach has been recently used to form the outer selective layer of polyimide based NF hollow fibers [34,35]. The PEI cross-linking not only decreases membrane pore size, but also brings in a plenty of amine groups on membrane surface.…”

Section: Introductionmentioning

confidence: 99%

Green modification of outer selective P84 nanofiltration (NF) hollow fiber membranes for cadmium removal

Gao

Sun

Zhu

et al. 2016

Journal of Membrane Science

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118

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Outer-selective thin-film composite (TFC) hollow fiber membranes are normally made from interfacial polymerization of m-phenylenediamine (MPD) and trimesoyl chloride (TMC).However, the removal of excess MPD solution and the large consumption of alkane solvents are their technical bottlenecks. In this study, green methods to prepare the outer selective TFC hollow fiber membranes were explored by firstly modifying the membrane substrate with polyethyleneimine (PEI) and then by water soluble small molecules such as glutaraldehyde (GA) and epichlorohydrin (ECH). Using P84 polyimide as the substrate, not only do these modifications decrease substrate's pore size, but also vary surface charge by making the membranes less positively charged. As a result, the resultant membranes have higher rejections against salts such as Na 2 SO 4 , NaCl and MgSO 4 . The PEI and then GA modified membrane has the best separation performance with a NaCl rejection over 90 % and a pure water permeability (PWP) of 1.74 ± 0.01 Lm −2 bar −1 h −1 . It also shows an impressive rejection to CdCl 2 (94 %) during long-term stability tests. The CdCl 2 rejection remains higher than 90% at operating temperatures from 5 to 60 °C. This study may provide useful insights for green manufacturing of outer-selective nanofiltration (NF) hollow fiber membranes.

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“…In contrast, NF membranes with positive surface charges would be ideal for water softening and heavy metal removal intuitively. Nevertheless, positively charged NF membranes exhibited relatively low rejection towards multivalent anions (e.g., Cr 2 O 7 2 À , SO 4 2 À , AsHO 4 2 À ) [18,19]. Moreover, during filtration processes, counter-ions and suspended colloids can be easily absorbed on the positively charged surface to partially weaken the electrostatic repulsion and accelerate membrane fouling [20,21].…”

Section: Introductionmentioning

confidence: 99%

Nanofiltration membranes with dually charged composite layer exhibiting super-high multivalent-salt rejection

Liu

Wang

et al. 2016

Journal of Membrane Science

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a b s t r a c tState-of-the-art nanofiltration (NF) membranes generally positively or negatively charged could not remove both multivalent cations and anions once and for all according to the Donnan Exclusion. Designing NF membranes with facile approach for effective removal of multivalent-salt without compromising the permeation is still a tough challenge. In this work, we demonstrate a sort of novel NF membrane consists of a positively charged interlayer sandwiched between substrate and negatively charged outermost surface. The restructured NF membranes with dually charged composite layer were fabricated via amination-interfacial polymerization (A-IP) on poly (vinyl chloride) (PVC) substrate. The resultant NF membranes exhibited super high salts rejection of up to 99.0% MgCl 2 , 99.0% MgSO 4 , 98.5% CaCl 2 , 95.7% Pb(NO 3 ) 2 , and 96.0% Na 2 SO 4 . Additionally, reasonably high flux (8.7 L m À 2 h À 1 bar À 1 , (pure water permeability (PWP))) approaching those of commercial NF membranes was obtained due to the relatively loose structure of the composite layer. Furthermore, the transport and separation mechanism of the restructured NF membranes reveals that the significant upgraded separation performance could be attributed to the synergistic effect of the dually charged layer. Moreover, the dually charged composite layer shown none unfavorable interaction and the resultant NF membranes possessed good interfacial stability.

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Chelating polymer modified P84 nanofiltration (NF) hollow fiber membranes for high efficient heavy metal removal

Cited by 252 publications

References 34 publications

Studies on the optimum conditions using acid-washed zero-valent iron/aluminum mixtures in permeable reactive barriers for the removal of different heavy metal ions from wastewater

Studies on the optimum conditions using acid-washed zero-valent iron/aluminum mixtures in permeable reactive barriers for the removal of different heavy metal ions from wastewater

Green modification of outer selective P84 nanofiltration (NF) hollow fiber membranes for cadmium removal

Nanofiltration membranes with dually charged composite layer exhibiting super-high multivalent-salt rejection

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