Positively charged aromatic polyamide reverse osmosis membrane with high anti-fouling property prepared by polyethylenimine grafting

Xu, Jun; Wang, Zhi; Wang, Jixiao; Wang, Shichang

doi:10.1016/j.desal.2015.03.026

Cited by 146 publications

(54 citation statements)

References 36 publications

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“…Thus the separation of volatile organic compounds by NF/RO processes is based predominantly on size exclusion [5]. In the case of charged trace organic compounds, electrostatic interactions between the charged solute and the negatively charged membrane surface can also play a key role [13,14]. Additionally, it has been demonstrated that hydrophobic compounds can adsorb onto membrane surfaces and subsequently may diffuse through RO and especially NF membranes, resulting in lower rejections than would be expected based only on size exclusion mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Removal of volatile organic compounds (VOCs) from groundwater by reverse osmosis and nanofiltration

Altalyan

Jones

Bradd

et al. 2016

Journal of Water Process Engineering

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. (2016). Removal of volatile organic compounds (VOCs) from groundwater by reverse osmosis and nanofiltration. Journal of Water Process Engineering, 9 9-21. Removal of volatile organic compounds (VOCs) from groundwater by reverse osmosis and nanofiltration AbstractA comprehensive study was conducted to examine the removal of volatile organic compounds (VOCs) which exist in groundwater at Southlands-Botany Bay (Sydney region). The ability of nanofiltration (NF) and reverse osmosis (RO) as advanced treatments was investigated using two commercially available NF or RO membranes. Laboratory-scale tests were used with cross-flow; tests were conducted with 16 ubiquitous compounds that represented the significant volatile organic compounds found in the contaminated groundwater. The results reported in this study indicate that the removal efficiency of reverse osmosis (RO) was better than NF in rejecting the VOCs detected in groundwater. This study revealed that the performance of NF and RO membranes in rejecting hydrophilic volatile organic compounds was higher than that for hydrophobic compounds and the highest rejection achieved by NF and RO membranes amounted 98.4% and 100%, respectively. Hydrophilic compounds can be effectively rejected by NF/RO membranes using the size exclusion mechanism (steric hindrance), whereas hydrophobic compounds can be adsorbed into NF/RO membranes and then diffuse through the dense polymeric matrix, resulting in the lower removal for these compounds compared to hydrophilic compounds. Keywords:Volatile organic compounds (VOCs) Reverse osmosis (RO) Nanofiltration (NF) Botany Bay ABSTRACT A comprehensive study was conducted to examine the removal of volatile organic compounds (VOCs) which exist in groundwater at Southlands-Botany Bay (Sydney region).The ability of nanofiltration (NF) and reverse osmosis (RO) as advanced treatments was investigated using two commercially available NF or RO membranes. Laboratory-scale tests were used with cross-flow; tests were conducted with 16 ubiquitous compounds that represented the significant volatile organic compounds found in the contaminated groundwater.The results reported in this study indicate that the removal efficiency of reverse osmosis (RO) was better than NF in rejecting the VOCs detected in groundwater. This study revealed that the performance of NF and RO membranes in rejecting hydrophilic volatile organic compounds was higher than that for hydrophobic compounds and the highest rejection achieved by NF and RO membranes amounted 98.4 % and 100 %, respectively. Hydrophilic compounds can be effectively rejected by NF/RO membranes using the size exclusion mechanism (steric hindrance), whereas hydrophobic compounds can be adsorbed into NF/RO membranes and then diffuse through the dense polymeric matrix, resulting in the lower removal for these compounds compared to hydrophilic compounds.

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Section: Introductionmentioning

confidence: 99%

Removal of volatile organic compounds (VOCs) from groundwater by reverse osmosis and nanofiltration

Altalyan

Jones

Bradd

et al. 2016

Journal of Water Process Engineering

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“…As Figure shown, the pure water fluxes of the supporting membranes were sharply increased from 106.7 to 736.2 L m −2 h −1 as the PPTA in situ blended ratio changing from 0 to 32. It is well known that the permeability of porous membranes was mainly dependent on its pore structure and surface morphology 44. The surface hydrophilicity was also evaluated by water contact angle (WCA) measurement (See Figure S2, Supporting Information), and the results demonstrated that the pure PMIA membrane had good hydrophilicity (WCA = 58.7°) due to its polyamide materials.…”

Section: Resultsmentioning

confidence: 98%

Feasible Preparation of a Thin‐Film Composite Nanofiltration (TFC NF) Membrane with Enhanced Skin–Substrate Adhesion and Compaction Resistance: In Situ Construction of Rigid–Flexible Polymer Composited Microspheres (CPs) in the Casting Solution

Lian

Xie

Shi

et al. 2020

Macro Materials & Eng

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Novel microspheres (CPs) composited by rigid and flexible polymers are synthesized and embedded in the supporting membranes to enhance both the skin–substrate adhesion and compaction resistance of the thin‐film composite (TFC) nanofiltration membranes. The CPs are in situ formed in the casting solution after the rigid poly(p‐phenylene terephthamide) (PPTA) is produced in the flexible poly(m‐phenylene isophthalamide) (PMIA) solution. Then the PPTA/PMIA in situ blending membranes are prepared by using the NIPs method, and the TFC NF membranes are fabricated via interfacial polymerization on them. The CPs are characterized via polarizing microscopy and TEM. The surface morphology and chemical composition of the blended membranes are characterized by using FESEM, AFM, FTIR, and WCA, respectively. As the results show, the supporting membrane with higher PPTA content exhibits higher permeability, thermal stability, and compaction resistance. Moreover, the adhesion strength between the TFC functional layer and the supporting membrane is improved significantly. It is proposed that this improvement can be attributed to the CPs that are exposed on the top surface of the supporting membrane, which leads to a great enhancement because of the anchoring effect between the functional layer and the CPs.

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“…Among these materials, polyethylenimine (PEI) with quantities of amine groups is considered to provide high density of positive charge sites on the membrane surface. However, the optimized PEI grafting method and grafting amount are still unknown when aiming at trace nuclide removal in boron‐containing LRW treatment …”

Section: Introductionmentioning

confidence: 99%

“…Lost salt rejection to a small extent 28 Surface adsorption Polyethyleneimine (PEI) Significantly improved antifouling properties to cationic foulants Less stable modification 29 Graft polymerization Polyethyleneimine (PEI) The zeta potential is positive under neutral conditions Salt rejection is to be improved 30 RO process. 10 Usually, the rejection of cesium(I) is only about 83-95% by using commercial membranes, and even lower in practical applications.…”

Section: Introductionmentioning

confidence: 99%

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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Positively charged aromatic polyamide reverse osmosis membrane with high anti-fouling property prepared by polyethylenimine grafting

Cited by 146 publications

References 36 publications

Removal of volatile organic compounds (VOCs) from groundwater by reverse osmosis and nanofiltration

Removal of volatile organic compounds (VOCs) from groundwater by reverse osmosis and nanofiltration

Feasible Preparation of a Thin‐Film Composite Nanofiltration (TFC NF) Membrane with Enhanced Skin–Substrate Adhesion and Compaction Resistance: In Situ Construction of Rigid–Flexible Polymer Composited Microspheres (CPs) in the Casting Solution

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

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