Polyamide thin film nanocomposite membranes with in-situ integration of multiple functional nanoparticles for high performance reverse osmosis

Huo, Hui-Qian; Mi, Yue; Yang, Xin; Lu, Hong-Hao; Ji, Yan-Li; Yong, Zhou; Gao, Congjie

doi:10.1016/j.memsci.2022.121311

Cited by 22 publications

(3 citation statements)

References 63 publications

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“…One method is to use nanoparticles, which would increase the negative surface charge of the final TFN membranes. For example, carboxyl groupgrafted molybdenum disulfide [36] or silver-functionalized biomimetic nanoparticles could be used [37]. However, increasing the negative surface charge of the membranes could deteriorate the rejection of MgCl 2 .…”

Section: Discussionmentioning

confidence: 99%

The Effect of Cu2+ and Pb2+ in the Feed Solution on the Water and Reverse Solute Fluxes in the Forward Osmosis (FO) Process Using Nanofiltration (NF) Membranes

2023

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The application of nanofiltration (NF) membranes in the forward osmosis (FO) process to remove heavy metal ions from wastewater is an emerging concept. Unlike NF, FO does not require an external driving force. Although the product, a dilute draw solution, must further be processed by NF to produce pure water and reconcentrate a draw solution, the feed to that NF process is “clean”, which minimizes membrane fouling. This paper examines the role of Cu2+ and Pb2+ in the feed solution on the water and the reverse solute fluxes in FO process using novel thin film nanocomposite (TFN) NF membranes. The TFN membranes were fabricated by in situ interfacial polymerization of piperazine (PIP) and 1,3,5-benzenetricarbonyl trichloride (TMC) containing different amounts of dispersed halloysite nanotubes (HNTs) nanoparticles functionalized with the first generation of poly(amidoamine) (PAMAM) dendrimers. The presence of Cu2+ and Pb2+ in the feed solution decreased the reverse flux of MgCl2 by at least 2.5 times compared to the experiments with pure water as a feed. Simultaneously, the water flux also increased. The corresponding rejections of Cu2+ and Pb2+ in the FO process ranged from 94.5% to 98.1%.

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Section: Discussionmentioning

confidence: 99%

The Effect of Cu2+ and Pb2+ in the Feed Solution on the Water and Reverse Solute Fluxes in the Forward Osmosis (FO) Process Using Nanofiltration (NF) Membranes

2023

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“…It was believed that changing the barrier layer structure of an RO membrane and thereby altering the desalination mechanism will be the promising approach to break the bottleneck, where high permeation flux and high rejection would be achieved, simultaneously . Attempts were made by (1) increasing the free volume of the barrier layer matrix by adding additives in the aqueous or organic phase; (2) improving the hydrophilicity of the barrier layer by the introduction of functional groups; (3) increasing the permeability of the barrier layer by nanomaterials; and (4) decreasing the degree of cross-linking of the barrier layer by post-treatments to improve the permeation flux of the RO membrane to a certain extent by changing the structure of the polyamide barrier layer …”

Section: Introductionmentioning

confidence: 99%

“…It was believed that changing the barrier layer structure of an RO membrane and thereby altering the desalination mechanism will be the promising approach to break the bottleneck, where high permeation flux and high rejection would be achieved, simultaneously. 8 Attempts were made by (1) organic phase; 9 (2) improving the hydrophilicity of the barrier layer by the introduction of functional groups; 10 (3) increasing the permeability of the barrier layer by nanomaterials; 11 and (4) decreasing the degree of cross-linking of the barrier layer by post-treatments to improve the permeation flux of the RO membrane to a certain extent by changing the structure of the polyamide barrier layer. 12 The concept of water channels was successfully introduced into the designation of RO membranes through aquaporin proteins, 13,14 carbon nanotubes, 15 liquid crystal phase, 16 zeolites, 17 graphene sheets, 18,19 and synthetic molecules, 20 wherein water molecules pass through confined channels and other species such as sodium ions are excluded.…”

Section: Introductionmentioning

confidence: 99%

High-Flux Nanofibrous Composite Reverse Osmosis Membrane Containing Interfacial Water Channels for Desalination

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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A nanofibrous composite reverse osmosis (RO) membrane with a polyamide barrier layer containing interfacial water channels was fabricated on an electrospun nanofibrous substrate via an interfacial polymerization process. The RO membrane was employed for desalination of brackish water and exhibited enhanced permeation flux as well as rejection ratio. Nanocellulose was prepared by sequential oxidations of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and sodium periodate systems and surface grafting with different alkyl groups including octyl, decanyl, dodecanyl, tetradecanyl, cetyl, and octadecanyl groups. The chemical structure of the modified nanocellulose was verified subsequently by Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA), and solid NMR measurements. Two monomers, trimesoyl chloride (TMC) and m-phenylenediamine (MPD), were employed to prepare a cross-linked polyamide matrix, i.e., the barrier layer of the RO membrane, which integrated with the alkyl groups-grafted nanocellulose to build up interfacial water channels via interfacial polymerization. The top and cross-sectional morphologies of the composite barrier layer were observed by means of scanning electron microscopy (SEM), atomic force microscopy (AFM), and transmission electron microscopy (TEM) to verify the integration structure of the nanofibrous composite containing water channels. The aggregation and distribution of water molecules in the nanofibrous composite RO membrane verified the existence of water channels, demonstrated by molecular dynamics (MD) simulations. The desalination performance of the nanofibrous composite RO membrane was conducted and compared with that of commercially available RO membranes in the processing of brackish water, where 3 times higher permeation flux and 99.1% rejection ratio against NaCl were accomplished. This indicated that the engineering of interfacial water channels in the barrier layer could substantially increase the permeation flux of the nanofibrous composite membrane while retaining the high rejection ratio as well, i.e., to break through the trade-off between permeation flux and rejection ratio. Antifouling properties, chlorine resistance, and long-term desalination performance were also demonstrated to evaluate the potential applications of the nanofibrous composite RO membrane; remarkable durability and robustness were achieved in addition to 3 times higher permeation flux and a higher rejection ratio against commercial RO membranes in brackish water desalination.

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Coatings for Membrane Separations

Saxena,

Soni,

Pilli

et al. 2024

Functional Coatings for Biomedical, Energy, and Environmental Applications

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Polyamide thin film nanocomposite membranes with in-situ integration of multiple functional nanoparticles for high performance reverse osmosis

Cited by 22 publications

References 63 publications

The Effect of Cu2+ and Pb2+ in the Feed Solution on the Water and Reverse Solute Fluxes in the Forward Osmosis (FO) Process Using Nanofiltration (NF) Membranes

The Effect of Cu2+ and Pb2+ in the Feed Solution on the Water and Reverse Solute Fluxes in the Forward Osmosis (FO) Process Using Nanofiltration (NF) Membranes

High-Flux Nanofibrous Composite Reverse Osmosis Membrane Containing Interfacial Water Channels for Desalination

Coatings for Membrane Separations

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