Investigation of novel molecularly tunable thin-film nanocomposite nanofiltration hollow fiber membranes for boron removal

Lan, Nana; Chung, Tai‐Shung; Weber, Martin; Maletzko, Christian; Chung, Tai‐Shung

doi:10.1016/j.memsci.2020.118887

Cited by 32 publications

(12 citation statements)

References 61 publications

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“…( 3)) are shown in the following equations. [35][36][37][38][39][40][41][42] The Langmuir adsorption isotherm was quantitatively related to single layer adsorbate formed on the adsorbent's outer surface, and the adsorbent's surface is completely consistent. [43] Freundlich isotherm adsorption describes multilayer sorption and heterogeneous surfaces.…”

Section: Brunauer-emmett-teller Analysis and Adsorption Analysismentioning

confidence: 97%

Synthesis, characterizations and kinetics of MOF‐5 as herbicide vehicle and its controlled release in PVA/ST biodegradable composite membranes

Lee

Wang

et al. 2021

Zeitschrift anorg allge chemie

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Polyvinyl alcohol/starch based composite membranes containing herbicide‐loaded metal‐organic‐framework (MOF‐5) was successfully synthesized by electrostatic spraying technique. Several main parameters affecting the adsorption of MOF‐5 were studied, including the initial concentration of the herbicide solution, adsorption time, and temperature. Under optimal conditions, herbicide‐loaded MOF‐5 was successfully synthesized and the main properties were characterized by Scanning Electron Microscopy (SEM), X‐Ray Diffraction (XRD), Fourier Transform Infrared Spectrometer (FTIR), Thermogravimetric Analysis (TG), and Brunauer‐Emmett‐Teller (BET), respectively. The results showed that the adsorption capacity of MOF‐5 at optimal conditions was 60.12wt%±0.61 % for atrazine. The sustained release effect of the AT@MOF‐5/PVA/ST composite membranes was reliable, and the cumulative release rate was about 50 % for 15 h. The release behaviour of AT from AT@MOF‐5/PVA/ST composite membranes was first dominated by the mechanism of Fickian diffusion and then by the mechanism of matrix erosion. The main advantages of agricultural herbicide film can be attributed to the eco‐friendly, biodegradable, and persistence of herbicide.

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Section: Brunauer-emmett-teller Analysis and Adsorption Analysismentioning

confidence: 97%

Synthesis, characterizations and kinetics of MOF‐5 as herbicide vehicle and its controlled release in PVA/ST biodegradable composite membranes

Lee

Wang

et al. 2021

Zeitschrift anorg allge chemie

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“…7−9 Based on the differences in membrane structures, NF membranes can be divided into two categories: flat-sheet and hollow-fiber type. 10,11 Among them, the flat-sheet thin-film composite (TFC) membranes with an ultrathin polyamide (PA)-rejecting layer fabricated atop polymer UF supports are state-of-art NF membranes in practical applications due to their excellent separation efficiencies and tailored fabrication processes. 12,13 TFC NF membranes are commonly composed of three layers: a nonwoven fabric backing layer, a porous polymer sublayer, and a PA-separating layer.…”

Section: Introductionmentioning

confidence: 99%

“…Membrane-based technologies are considered advanced and efficient approaches to alleviating global water scarcity. − Nanofiltration (NF) membranes, whose behaviors are between ultrafiltration (UF) and reverse osmosis (RO), selectively desalinate water and remove organic matter through steric hindrance and electrostatic interactions. − Until now, NF-based membrane technologies have been broadly applied in brackish water desalination, wastewater recycling, and advanced purification of drinking water. − Based on the differences in membrane structures, NF membranes can be divided into two categories: flat-sheet and hollow-fiber type. , Among them, the flat-sheet thin-film composite (TFC) membranes with an ultrathin polyamide (PA)-rejecting layer fabricated atop polymer UF supports are state-of-art NF membranes in practical applications due to their excellent separation efficiencies and tailored fabrication processes. , …”

Section: Introductionmentioning

confidence: 99%

Poly(vinylidene fluoride) Substrate-Supported Polyamide Membrane for High-Temperature Water Nanofiltration

Zhu

Cheng

et al. 2022

ACS Appl. Polym. Mater.

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Conventional polysulfone and polyethersulfone membrane-supported polyamide (PA) nanofiltration (NF) membranes suffer an obvious performance decline due to the drastic pore shrinkage of their membranes during high-temperature (HT) desalination processes. Herein, a thermally stable PA NF membrane (PVDF-IP-2) was successfully constructed over a relatively hydrophobic polyvinylidene fluoride (PVDF) membrane using a continuous interfacial polymerization (CIP) method. The PVDF-IP-2 membrane had a moderate water permeance of 8.3 L m–2 h–1 bar–1 and a 99.7% Na2SO4 rejection at room temperature, which were comparable to those of commercial NF membranes. Introducing calcium ions (Ca2+) into the aqueous solutions further confined the transport rate of the piperazine monomer across the reaction interface through the coordination functions between Ca2+ and piperazine molecules, forming a high-flux (15.9 L m–2 h–1 bar–1 at room temperature) NF membrane (PVDF-IP-Ca) with an excellent Na2SO4 rejection (∼98.6%). Impressively, the PVDF-IP-Ca membrane presented an excellent antifouling behavior and performance stability during both fouling and high-temperature filtration tests. The Ca2+-assisted IP (Ca–CIP) strategy is expected to be a facile and universal approach to preparing TFC desalination membranes for HT environmental applications on relatively hydrophobic supports.

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“…Although membrane fouling is inevitable, it can be alleviated by effective physical, chemical, and biological fouling control strategies depending on the type of fouling that is dominant 3 . Therefore, multiple strategies have been developed to overcome membrane fouling and improve effluent quality, such as novel membrane materials, 4,5 improvement in process conditions (such as aeration, backwashing frequency, and solids retention time) and optimization of system design 2,6–8 . However, numerous problems remain unsolved.…”

Section: Introductionmentioning

confidence: 99%

Assessment of hydraulic performance and fouling control caused by pulse flow in hollow fiber membrane module

et al. 2022

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To shed light on the effect of pulse flow on shear force and membrane fouling, the pulse frequency and flow velocity based on fiber Bragg grating (FBG) sensing technology were studied. The results show that there is a threshold for this synergy between the pulse frequency and flow velocity, which forms more easily at a high pulse frequency and low flow velocity. Moreover, the transition from pulse flow to continuous flow affects the shear force distribution with the membrane module height. Besides, at the same volumetric flow, Re gradually reaches a plateau as the pulse frequency increases from 1 to 5 Hz, and the membrane fouling control has a better flux recovery, which can reach a maximum of 28.89%. Finally, the results also show that the combined effect of high pulse frequency and low flow velocity would be higher than that of low pulse frequency and high flow velocity.

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Investigation of novel molecularly tunable thin-film nanocomposite nanofiltration hollow fiber membranes for boron removal

Cited by 32 publications

References 61 publications

Synthesis, characterizations and kinetics of MOF‐5 as herbicide vehicle and its controlled release in PVA/ST biodegradable composite membranes

Synthesis, characterizations and kinetics of MOF‐5 as herbicide vehicle and its controlled release in PVA/ST biodegradable composite membranes

Poly(vinylidene fluoride) Substrate-Supported Polyamide Membrane for High-Temperature Water Nanofiltration

Assessment of hydraulic performance and fouling control caused by pulse flow in hollow fiber membrane module

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