New insights into tailoring polyamide structure for fabricating highly permeable reverse osmosis membranes

Qin, Yitian; Yu, Sha; Zhao, Qi; Kang, Guodong; Yu, Haijun; Jin, Yan; Cao, Yijun

doi:10.1016/j.desal.2020.114840

Cited by 22 publications

(8 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As presented in the modulus distribution of the 2D images, the high modulus region increases with the TMC concentration, increasing from 0.05 to 0.125%. Similarly, the low modulus polyamide matrix distributed uniformly is observed as well in the polyamide active layer from Figure S6, which is consistent with previous reports. ,, In this work, the polyamide layer prepared with an increased TMC concentration (0.05–0.125%) has a higher elastic modulus and higher cross-linking degree (XPS results).…”

Section: Resultssupporting

confidence: 92%

“…The O 1s peak is deconvoluted into two peaks at 531.8 eV for OC–N and 534.3 eV for OC–O, respectively (presented in Figure S4c,e,g). ,, The presence of OC–O is derived from the generation of -COOH, suggesting the existence of the linear polyamide backbone. Notably, the content of the −COOH in the TFC-2-0.125 membrane (20.74%) is lower than that of TFC-2-0.05 (27.53%) and TFC-2-0.2 membranes (30.87%), evidencing the higher polyamide cross-linking density for the TFC-2-0.125 membrane.…”

Section: Resultsmentioning

confidence: 99%

“…The streaming potential value was obtained using 1 mmol L –1 of KCl as the feed solution at 25 ± 1°C, adjusting the pH in the range of 3–10. The elastic property of the polyamide layer was assessed via Young’s modulus, which was determined by the atomic force microscope (AFM, Dimension Icon, Bruker, Germany) nanoindentation technique …”

Section: Methodsmentioning

confidence: 99%

“…Owing to population explosion, rapid industrialization and urbanization, and pollution of surface water resources, the increasing demand for fresh water drives people to seek alternate water resources, such as seawater and brackish water, to solve the water scarcity problem. − Although distillation and freezing are effective means of extracting clean water from seawater and brackish water, their expensive economic costs require the exploration of green and sustainable technologies to meet the growing freshwater and carbon reduction demand . Due to its low energy consumption, high separation efficiency, and small footprint, reverse osmosis (RO), as the dominant process, has been widely used in seawater desalination, water hardness removal, wastewater reuse, and drinking water production. − Current mainstream RO membranes have a thin-film composite (TFC) structure consisting of 3 parts: an ultrathin polyamide active layer (20–200 nm) at the top, a microporous polysulfone support layer (20–50 μm) in the middle, and a polyester backing layer (50–150 μm) at the bottom. − The polyamide active layer is the selective barrier for water/salt separation, and its physicochemical properties play a key role in the performance of TFC RO membranes …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Water/Salt Transport Properties of Polyamide Reverse Osmosis Membranes Using Quartz Crystal Microbalance

Hu,

Zhang,

You

et al. 2023

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

Thin-film composite (TFC) reverse osmosis (RO) membranes prepared by interfacial polymerization of M-phenylene diamine (MPD) and trimesoyl chloride (TMC) are the most widely used membranes in the current desalination market. However, how to accurately and quantitatively describe the permeation process that quantifies the water/salt partition coefficient (K) and the diffusivity coefficient (D) of the polyamide matrix in the polyamide active layer remains a challenge. Herein, the water and salt transport properties of polyamide (PA) TFC membranes are systematically investigated for the first time based on the quartz crystal microbalance with dissipation (QCM-D), and the relationships between structure and transport properties are investigated. The change of water/salt participation (K w and K s ) with the TMC concentration is much more sensitive than that with the MPD concentration increase. The K w slightly changes with increasing monomer concentrations, while the K s increases first and then remains almost unchanged with an increase in the TMC concentration. There is a significant reduction of the D w and D s of the polyamide matrix by enhancing the cross-linking degree as the TMC concentration increased from 0.05 to 0.125%. Enhancing the cross-linking degree of the polyamide matrix by adjusting the monomer concentration is beneficial to improve water/salt diffusivity selectivity. The evolving trend of permeability is consistent with the diffusivity, indicating that the permeability of the polyamide TFC membrane is mainly determined by the diffusivity of the polyamide matrix. In conclusion, varying the TMC concentration is more likely to change the physicochemical properties of the polyamide active layers, including water/salt transport properties.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Water/Salt Transport Properties of Polyamide Reverse Osmosis Membranes Using Quartz Crystal Microbalance

Hu,

Zhang,

You

et al. 2023

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…S5 †). 33 Obviously, the O]C-N group is derived from the reaction between the acyl chloride in TMC monomers and primary amines in MPD monomers. The O]C-O group can be attributed to the carboxyl acid group formed by the hydrolysis of the unreacted acyl chloride group.…”

Section: Pore Size Regulation Of the Pa Layermentioning

confidence: 99%

A polyaniline nanofiber array supported ultrathin polyamide membrane for solar-driven volatile organic compound removal

et al. 2022

View full text Add to dashboard Cite

show abstract

Eu‐Doped Polyurethane with Efficient Multicolor Fluorescence, Self‐Healing, Stimuli‐Responsiveness and Its Diverse Applications

Wang,

Kong

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

Multicolor lanthanide‐doped polymers have found versatile applications in data encryption, sensing, and smart display. However, multiple components, sophisticated design, and complex preparation procedures are often required. In contrast, their intrinsic and multicolor fluorescence emission is been effectively used. Herein, Eu‐doped polyurethane (ETP@PU), integrating tunable multicolor emission, self‐healing, and multi‐responsiveness, is prepared through a facile route via step‐growth polymerization of PU using commercial Eu‐ligand (Eu(TTA)3Phen, ETP) as a fluorophore. FTIR and XPS analysis demonstrate the successful coordination of Eu3+ with carbamate groups of PU, which not only enhances the mechanical properties of PU but also bestows unique luminescent properties. With increasing ETP content, the intrinsic fluorescence of PU declines, while that of Eu displays a discernible enhancement, resulting in the tunable multicolor emission. The highest quantum yield of Eu‐related emission reaches 71.3% due to the robust coordination and efficient energy transfer between Eu3+ and PU. Moreover, the ETP@PU exhibits excellent self‐healing capacity and multi‐responsiveness, and their potential applications are also investigated in the field of light‐emitting diodes, data encryption, and self‐healing process monitoring. This work provides a facile and efficient strategy to develop multicolor lanthanide‐doped polymers promising for various applications.

show abstract

New insights into tailoring polyamide structure for fabricating highly permeable reverse osmosis membranes

Cited by 22 publications

References 46 publications

Water/Salt Transport Properties of Polyamide Reverse Osmosis Membranes Using Quartz Crystal Microbalance

Water/Salt Transport Properties of Polyamide Reverse Osmosis Membranes Using Quartz Crystal Microbalance

A polyaniline nanofiber array supported ultrathin polyamide membrane for solar-driven volatile organic compound removal

Eu‐Doped Polyurethane with Efficient Multicolor Fluorescence, Self‐Healing, Stimuli‐Responsiveness and Its Diverse Applications

Contact Info

Product

Resources

About