Fabrication of high boron removal reverse osmosis membrane with broad industrial application prospect by introducing sulfonate groups through a polyvinyl alcohol coating

Duan, Ruxue; lv, Xiang; Yan, Wentao; Yong, Zhou; Gao, Congjie

doi:10.1016/j.memsci.2022.121079

Cited by 15 publications

(3 citation statements)

References 66 publications

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“…Figure c(2–7) shows the high-resolution spectra of the C and O of the CAM and the C, O, N, and S of the TCM. The high-resolution spectra of the TCM of different elements are as mentioned: (i) C 1s shows six individual peaks corresponding to C–C (284.6 eV), C–S (288.93 eV), C–N (285.9 eV), C–O (288.5 eV), C–F (291.5 eV), and CO (289.4 eV); , (ii) N 1s shows two nitrogen binding peaks corresponding to N–S (401.1 eV) and N–C (399.7 eV); (iii) O 1s shows three oxygen bonding peaks at O–C (533.3 eV), OS (532.3 eV), and OC (531.5 eV); and (iv) S 2p shows two pairs of major peaks at 170.2 and 169.0 eV, and 168.4 and 169.6 eV, attributed to 2p3/2 and 2p1/2 of SO and 2p3/2 and 2p1/2 of S–N, S–C, respectively . SHGCs successfully bind to the CAM surface to form TCM, as verified via XPS.…”

Section: Resultsmentioning

confidence: 99%

Supramolecular Interaction Modulation in Thermosensitive Composites: Enantiomeric Recognition and Chiral Site Regeneration

Chen,

Qiu,

Chen

et al. 2024

Anal. Chem.

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Herein, a novel strategy was implemented to modulate the supramolecular interaction between enantiomers and chiral recognition sites (CRSs), effectively resolving the issue of CRS saturation. Randomly methylated-β-cyclodextrin (Rm-β-CD) was used as the CRS (host molecule), and polymerized ionic liquids [poly ([vbim]TFSI)] were used as the supramolecular modulator (guest molecule), which self-assembled to generate thermosensitive supramolecular host/guest complexes. The enantiomeric binding capacity and enantioselectivity of chiral separation systems centered on supramolecular host−guest complexes are characterized by a high degree of temperature dependence. Poly([vbim]TFSI) bonded to Rm-β-CD at temperatures between 17 °C ± 3 and 50 °C ± 3 °C, and the binding free energy difference (|ΔΔG|) between the (S)-and (R)-enantiomer was 0.55. Conversely, poly([vbim]TFSI detached from Rm-β-CD at temperatures >50 °C ± 3 °C or <17 °C ± 3 °C, and |ΔΔG| between (S)-and (R)-enantiomer was 0.03. The |ΔΔG| value of the (R)-enantiomer can reach 0.86 in two temperature intervals. Therefore, the binding of poly([vbim]TFSI) to Rm-β-CD afforded the favorable separation of four racemic sample mixtures: mandelic acid (e.e.% = 61.3%), ibuprofen (e.e.% = 21.6%), warfarin (e.e.% = 14.9%), and naproxen (e.e% = 18.2%). The detachment of poly([vbim]TFSI) from Rm-β-CD released the enantiomer bound to CRSs. The decomplexation of mandelic acid reached 75.1%.

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Section: Resultsmentioning

confidence: 99%

Supramolecular Interaction Modulation in Thermosensitive Composites: Enantiomeric Recognition and Chiral Site Regeneration

Chen,

Qiu,

Chen

et al. 2024

Anal. Chem.

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“…However, the impact of fouling in terms of increased B coefficient, which would be more favorable for the SWMM model 9, was not evaluated. This could be critical when attention is paid to ions less rejected by SWRO membranes, such as boron and fluoride [ 69 , 70 , 71 ].…”

Section: Resultsmentioning

confidence: 99%

Impact of SWMM Fouling and Position on the Performance of SWRO Systems in Operating Conditions of Minimum SEC

et al. 2023

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Due to water stress in the world in general desalination technologies are becoming increasingly important. Among the available technologies, reverse osmosis (RO) is the most widespread due to its reliability and efficiency compared to other technologies. The main weakness of RO is the loss of performance due to membrane fouling, which usually affects the water permeability coefficient (A), causing it to decrease. In RO desalination plants, fouling does not affect all spiral wound membrane modules (SWMMs) in the pressure vessels (PVs) in the same way. This will depend on the type of fouling and the position of the SWMM inside the PV. In this study, the impact of A and the position of the SWMM on the performance of the RO system is analyzed. For this purpose, decrements of up to 50% have been assumed for the seven SWMMs in series considering nine commercial SWMM models. The operating point analyzed is that which minimizes the specific energy consumption (SEC), a point obtained in a previous work carried out by the authors. The results show how the impact of A on the SWMM in the first position is more significant than the impact on modules that are in another position for the nine SWRO models studied. A drop of 50% in the coefficient A of the first element produces a permeate loss in the pressure pipe between 0.67 and 1.35 m3 d−1. Furthermore, it was observed that the models with the lowest coefficient A exhibited the highest performance losses in terms of permeate production when A was decreased.

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“…Therefore, the ability of conventional TFC polyamide membranes to remove boric acid remains rather weak . Recently, TFC polyamide membranes modified by incorporating functional molecules (e.g., aliphatic amines and polyols) into or onto their polyamide layer can achieve an improved ability to reject boric acid. − Despite improvements having been made, the boron concentration of purified water for agricultural applications still cannot meet the requirement. To this end, seeking novel membrane materials capable of effectively removing boric acid remains of urgent importance.…”

Section: Introductionmentioning

confidence: 99%

Design of Nanoporous Materials as Reverse Osmosis Membranes for Boron Removal: Pore Shape Matters

Huang,

Lyu,

Chien

et al. 2023

J. Phys. Chem. C

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Water shortage has been a pressing issue of our time, and reverse osmosis (RO) desalination has been employed as a vital technique to produce clean water at a large scale. While salt ions are the major solutes in seawater, boron species, particularly in the form of boric acid, also prevalently exist and are harmful. Owing to the size being comparable between boric acid and water, removing boric acid using conventional RO membranes has been a great challenge. To this end, it is crucial to develop more effective membranes for boron removal. Graphyne, an emerging class of two-dimensional materials with diverse pore shapes (e.g., hexagon and triangle), has been demonstrated to be promising membrane materials for water desalination. It is therefore of interest and importance to explore their potential in boron removal as well as to fundamentally understand the effect of pore shapes on their boron removal performance. In this study, by employing molecular simulation techniques, we demonstrate that graphyne can provide opportunities as an RO membrane for boron removal. In particular, both αand β-graphyne membranes, which feature hexagonal pores, can completely remove boric acid. By contrast, the γ-graphyne membrane with triangular pores of a similar size (i.e., pore limiting diameter (PLD)) interestingly demonstrates a poor ability to remove boric acid. Detailed investigations on the permeation process of boric acid molecules, including their distribution and orientation in the nanopores, reveal that the rotation motion of plane-like boric acid molecules can allow them to permeate through the triangular pores relatively easily, thus resulting in a dramatically low boron rejection. These results suggest the difficulty in geometrically blocking boric acid and the effectiveness of the hexagonal pore as compared to the triangular pore. Provided the PLD alone may not sufficiently inform the boron removal capability, the free energy barrier of boron transport is computed using a newly developed algorithm and demonstrated to be capable of better probing the performance of membranes in boron removal. Overall, the outcomes of this work are anticipated to offer insights into the rational design of RO membranes for efficient and effective boron removal.

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Fabrication of high boron removal reverse osmosis membrane with broad industrial application prospect by introducing sulfonate groups through a polyvinyl alcohol coating

Cited by 15 publications

References 66 publications

Supramolecular Interaction Modulation in Thermosensitive Composites: Enantiomeric Recognition and Chiral Site Regeneration

Supramolecular Interaction Modulation in Thermosensitive Composites: Enantiomeric Recognition and Chiral Site Regeneration

Impact of SWMM Fouling and Position on the Performance of SWRO Systems in Operating Conditions of Minimum SEC

Design of Nanoporous Materials as Reverse Osmosis Membranes for Boron Removal: Pore Shape Matters

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