Tannic acid reinforced interfacial polymerization fabrication of internally pressurized thin-film composite hollow fiber reverse osmosis membranes with high performance

Lv, Xinghua; Wang, Enlin; Liu, Shaoxiao; Liu, Liyang; Yin, Yating; Li, Shuxuan; Su, Baowei; Han, Lihui

doi:10.1016/j.desal.2022.115926

Cited by 24 publications

(5 citation statements)

References 73 publications

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“…To further understand the chemical structure of the polyamide layers, the O 1s spectra of the membranes were deconvolved into OC═O and NC═O, and results can be seen in Figure 3. As the interface temperature rises, the percentage composition of NCO increases from 70.48% to 83.8%, and the OCO group decreases simultaneously, which indicates that the polyamide layer prepared under high interface temperature has higher cross‐linking degree and better density 27 . The reason is that increasing the temperature may facilitate monomer diffusion and accelerate the IP reaction rate.…”

Section: Resultsmentioning

confidence: 99%

“…As the interface temperature rises, the percentage composition of N C O increases from 70.48% to 83.8%, and the O C O group decreases simultaneously, which indicates that the polyamide layer prepared under high interface temperature has higher cross-linking degree and better density. 27 The reason is that increasing the temperature may facilitate monomer diffusion and accelerate the IP reaction rate. At low temperatures, the TMC monomer diffused slowly toward the interface and less monomer participated in the reaction, leading to a greater amount of unreacted acyl chloride present who hydrolyzed to the carboxyl groups.…”

Section: Surface Chemical Compositionmentioning

confidence: 99%

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Fine‐tuning of fully‐aromatic polyamide membrane for fluorinated water purification

Gao

Huang

et al. 2023

J of Applied Polymer Sci

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High concentrations of fluoride in drinking water can lead to fluorosis of teeth and bones and other serious diseases, while nanofiltration is an attractive technique for fluoride removal. Interfacial temperature can determine the monomer diffusion rate in interfacial polymerization (IP) process, thereby tuning the structure of membrane such as thickness, pore size and surface charge. Herein, a fully-aromatic polyamide nanofiltration membrane with desirable separation performance was customized by interface temperature. The resulting membrane exhibits a flux of 6 L m À2 h À1 bar À1 and the molecular weight cut-off is 211 Da, most importantly, a 90.3% F À rejection to underground water, indicating that the membrane has application potential in underground water treatment. This work helps to better understand the effects of interface temperature on the IP process and provides a new strategy to address the drinking water problem.

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Section: Resultsmentioning

confidence: 99%

Section: Surface Chemical Compositionmentioning

confidence: 99%

Fine‐tuning of fully‐aromatic polyamide membrane for fluorinated water purification

Gao

Huang

et al. 2023

J of Applied Polymer Sci

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“…HF ultrafiltration (UF) substrates were fabricated using PSf power according to the literature [ 31 , 32 ], using the specific membrane preparation parameters listed in the Supplementary Materials S1 . A TFC HF NF membrane with a positively charged surface was fabricated according to our recent work [ 30 ], and was termed TFC-BPEI- x (TFC-BPEI for short), in which x represents the BPEI concentration in the ethanol solution.…”

Section: Methodsmentioning

confidence: 99%

A Selective Separation Mechanism for Mono/divalent Cations and Properties of a Hollow-Fiber Composite Nanofiltration Membrane Having a Positively Charged Surface

Wang,

Lv,

Liu

et al. 2023

Membranes

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Positively charged nanofiltration (NF) technology is considered a green and low-cost method for mono/divalent cation separation. Nevertheless, the separation rejection mechanisms of these NF membranes have yet to be extensively investigated. In this work, we fabricated a thin-film composite (TFC) hollow-fiber (HF) NF membrane with a positively charged surface via modification of the nascent interfacial polymerization layer using a branched polyethyleneimine (BPEI)/ethanol solution. Then, we extensively investigated its selective separation mechanism for mono/divalent cations. We proposed and proved that there exists a double-charged layer near the membrane surface, which helps to repel the divalent cations selectively via Donnan exclusion while promoting the fast penetration of monovalent cations. Meanwhile, the membrane skin layer is loose and hydrophilic due to the loose BPEI structure and the abundance of amine groups, as well as the changed fabrication conditions. In this way, we achieved very good mono/divalent cation selectivity and relatively high water permeance for the as-prepared HF NF membrane. We also obtained good anti-fouling, anti-scaling, and acid resistance, and long-term stability as well, which are urgently needed during practical application. Furthermore, we successfully amplified this HF NF membrane and proved that it has broad application prospects in mono/divalent cation separation.

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“…22 Motivated by this, we were able to develop an easy, one-pot solid-state reaction and cost-effective synthesis of MCs that were functionalized with TA (termed as MCTs hence). In addition to improving the dispersity of MC nanomaterials within the polymeric phase, 23 TA forms complexes with m-phenylenediamine (MPD) via its OH functional groups and creates cross-linking with the acid chloride group of trimesoyl chloride (TMC) during its interfacial polymerization 24 via the Michael addition/Schiff base reaction 25 to form a stable PA on the PSF substrate.…”

Section: Introductionmentioning

confidence: 99%

Tannic Acid-Functionalized MoS₂ and g-C₃N₄ Thin Film Lamellar Membranes for Improved Permeance and Rejection in Nanofiltration

Vinothkumar,

Kanagaraj,

Padaki

et al. 2024

ACS Appl. Nano Mater.

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Design of lamellar membranes using nanomaterials of different dimensions has gained importance as they offer combined and synergetic properties that can significantly enhance the permeance and rejection. Herein, we report the fabrication of a lamellar thin film composite of a polyamide composite membrane via interfacial polymerization using 1T-molybdenum disulfide/ graphitic carbon nitride (1T-MoS 2 /g-C 3 N 4 ), synthesized by a one-pot solid state reaction. The developed nanofiller 1T-MoS 2 /g-C 3 N 4 (MC) had unresolved issues, namely, low stability, agglomeration, low processability, and poor compatibility when incorporated into membranes. A sustainable approach to functionalize the MC surface with low-cost, stable, and ecologically friendly tannic acid (TA), a polyphenol derived from plants and rich in −OH functional groups, has significantly addressed the aforementioned issues. The hydrophilic nature and strong negative charge of TA produce a dense network on the membrane surface, inducing nanofiltration ability, in addition to offering efficient permeance. The optimal loading of this functionalized composite in the membrane resulted in an 18.4% NaCl rejection while achieving twice the permeance (17.7 L m −2 h −1 bar −1 ) compared to that of the non-TA-treated membranes. Divalent salts of sodium and magnesium sulfate show rejection up to 97 and 95%, respectively, while dye molecules of Congo red (696.7 Da) and methylene orange (327.3 Da) show >94% rejection, all with very good permeance. The robust and economical technique of one-pot synthesis of nanofillers together with easy functionalization rendered a very strong, tough, high antifouling thin film nanocomposite membrane that could practically be applied in desalination applications. KEYWORDS: 1T-MoS 2 /g-C 3 N 4 , tannic acid, thin film membranes, salt and dye rejection, wastewater treatment

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Tannic acid reinforced interfacial polymerization fabrication of internally pressurized thin-film composite hollow fiber reverse osmosis membranes with high performance

Cited by 24 publications

References 73 publications

Fine‐tuning of fully‐aromatic polyamide membrane for fluorinated water purification

Fine‐tuning of fully‐aromatic polyamide membrane for fluorinated water purification

A Selective Separation Mechanism for Mono/divalent Cations and Properties of a Hollow-Fiber Composite Nanofiltration Membrane Having a Positively Charged Surface

Tannic Acid-Functionalized MoS₂ and g-C₃N₄ Thin Film Lamellar Membranes for Improved Permeance and Rejection in Nanofiltration

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Tannic acid reinforced interfacial polymerization fabrication of internally pressurized thin-film composite hollow fiber reverse osmosis membranes with high performance

Cited by 24 publications

References 73 publications

Fine‐tuning of fully‐aromatic polyamide membrane for fluorinated water purification

Fine‐tuning of fully‐aromatic polyamide membrane for fluorinated water purification

A Selective Separation Mechanism for Mono/divalent Cations and Properties of a Hollow-Fiber Composite Nanofiltration Membrane Having a Positively Charged Surface

Tannic Acid-Functionalized MoS2 and g-C3N4 Thin Film Lamellar Membranes for Improved Permeance and Rejection in Nanofiltration

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Product

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Tannic Acid-Functionalized MoS₂ and g-C₃N₄ Thin Film Lamellar Membranes for Improved Permeance and Rejection in Nanofiltration