Performance enhancement of TFC FO membranes with polyethyleneimine modification and post-treatment

Shen, Liang; Zhou, Xuan; Zuo, Jian; Wang, Yan

doi:10.1016/j.memsci.2017.04.008

Cited by 97 publications

(58 citation statements)

References 60 publications

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“…Grafting with small PEI molecules can flatten the membrane surface. However, with an increase of PEI chain length, the membrane surface roughness increased . Consequently, with the increasing of PEI molecular weights, membrane surface roughness decreased first and then increased Fig.…”

Section: Resultsmentioning

confidence: 94%

The application of polyethylenimine grafting reverse osmosis membrane in treating boron‐containing low‐level radioactive wastewaters

Chen

Ding

Zhao

2019

J of Chemical Tech & Biotech

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BACKGROUND Reverse osmosis (RO), which is widely utilized in wastewater treatment, has been proven to be an effective tool for ion separation with high salts rejection. However, owing to the extremely low concentration of nuclides in boron‐containing low‐level radioactive wastewaters (LRWs), there is a significant reduction in rejection of nuclides by using commercial RO membranes. In this study, in order to obtain higher nuclides rejection under trace‐level condition, novel polyamide RO membranes were fabricated by grafting polyethylenimine (PEI) with different molecular weights on commercial RO membrane surfaces. RESULTS The properties of PEI‐modified membranes were analyzed, such as surface charge, morphology and hydrophilicity. The results showed that zeta potential at pH 7 increased from −22.89 mV to 20.19 mV, which indicated that surface charge altered from negative to positive. Meanwhile, hydrophilicity of membranes was improved since the contact angle decreased from 65° to 36°. The decontamination factor (DF) of cesium(I) increased from 11.69 to 114.23 and the DF of cobalt(II) increased from 28.62 to 3306.88. CONCLUSION The laboratory‐scale experiments with cross‐flow demonstrated the effective rejection of nuclides without obvious membrane flux loss of PEI‐modified membranes. In addition, PEI‐modified membranes offered a stable nuclides removal under high‐level background boron and various pH conditions, which demonstrated a possible application in boron‐containing LRW treatment. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 94%

The application of polyethylenimine grafting reverse osmosis membrane in treating boron‐containing low‐level radioactive wastewaters

Chen

Ding

Zhao

2019

J of Chemical Tech & Biotech

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“…The most frequently employed RO membrane materials are cellulose acetate, polyamide, any heterocyclic polymer, crosslinked water soluble polymers and polymerizable monomer (formed by crosslinking), polybenzimidazole, polyacrilonitrile, poly-piperazinamides, etc [71][72][73][74][75]. However, they are broadly classified into two groups: asymmetric membranes containing one polymer, and thin-film, composite membranes consisting of two or more polymer layers [4,[76][77][78][79][80][81][82].…”

Section: Ro Membrane Materialsmentioning

confidence: 99%

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

Ghernaout¹

2017

AJCHE

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Do really reverse osmosis (RO) membranes need modification to cover their disadvantages or enhance their efficiency? Are there any defects in RO membranes manufacturing that require modification? These questions are discussed here in this short review. Through the world, there are thousands of patents, publications, and PhD theses dealing with surface modification and grafting of RO membranes. This growing phenomenon should attract the attention of the scientific community for technologic and economic reasons. Due to the increasing water pollution levels, which overpassed the RO membranes capacities, there is an urgent need to manufacture RO membranes, with multidisciplinary characteristics and high performance regarding both salts removal and fouling resistance, before sending them to the market and avoiding to think to their following modification.

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“…Another common name for this is DCSs, which stands for dissolved and colloidal substances. At present, the main methods of eliminating anionic trash are chemical and biological methods . The chemical fixation method uses anionic trash catchers (ATCs), such as polyethyleneimine (PEI) and poly(aluminum chloride), to remove anionic trash and neutralize the electronegativity of DCSs.…”

Section: Introductionmentioning

confidence: 99%

“…They may have a negative impact on the effectiveness of cationic additives and may be unable to firmly anchor anionic trash onto pulp fibers. Nowadays, there have been plenty of studies on the application of ATCs in anionic trash elimination . However, the use of ATCs to modify the DM surface and the application of the modified product to the papermaking process have not been reported.…”

Section: Introductionmentioning

confidence: 99%

“…The majority of amino groups on the molecular chains of PEI are in the protonated state in aqueous solutions with pHs of less than 10, so PEI is a kind of cationic polyelectrolyte. These characteristics of PEI have attracted wide attention from scholars, and PEI has been used in many fields, including separation and purification . This is an effective approach for preparing functional materials with PEI molecules to modify the surface of porous particles …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of a modified diatomite filler via polyethyleneimine impregnation and its application in papermaking

Shang

Qian

2018

J of Applied Polymer Sci

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In this study, we sequentially modified diatomite (DM) particles with sodium dodecyl sulfate and polyethyleneimine with an impregnation method. Modified DM was used as both a filler and an anionic trash catcher in the papermaking process. The surface morphology, f potential, particle size, and Fourier transform infrared spectrum of the modified DM were investigated, and the application performance of the modified DM was evaluated through filler retention, f potential, drainability, and cationic demand of the papermaking furnish and the paper strength properties. The results show that the modified DM could be used as a good, novel filler in papermaking. The f potential of the surface of the modified DM particles was changed from electronegative to electropositive, and the particle size of the modified DM particles was increased. The retention of the modified DM filler was 16% higher than that of the unmodified DM when the filler dosage was 40%. The higher f potential was responsible for the higher retention of the modified DM filler. The drainability of the papermaking furnish was improved efficiently. The anionic trash in the papermaking system was anchored efficiently, and the cationic demand of the papermaking furnish decreased over 85% when the dosage of modified DM was 35%. Compared with the handsheets filled with unmodified DM, the handsheets filled with modified DM had higher strength properties.

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Performance enhancement of TFC FO membranes with polyethyleneimine modification and post-treatment

Cited by 97 publications

References 60 publications

The application of polyethylenimine grafting reverse osmosis membrane in treating boron‐containing low‐level radioactive wastewaters

The application of polyethylenimine grafting reverse osmosis membrane in treating boron‐containing low‐level radioactive wastewaters

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

Preparation of a modified diatomite filler via polyethyleneimine impregnation and its application in papermaking

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