Crosslinked PVA-based hybrid membranes containing di-sulfonic acid groups for alkali recovery

Dai, Chao; Mondal, Abhishek N.; Wu, Liang; Wu, Yonghui; Xu, Tongwen

doi:10.1016/j.seppur.2017.04.032

Cited by 20 publications

(21 citation statements)

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“…The dialysis coefficients of OH − (U OH ) and the separation factors (S) of the as-prepared membranes are shown in Figure 6 . The U OH of the membranes was in the range of 0.0147 to 0.0347 m h −1 , which was higher than that in most existing studies [ 18 , 25 , 31 ]. The results indicated that the presence of BACs in the PVA was advantageous to the enhancement of OH − flux, while the influence of BACs introduction on the U OH of the membrane was complicated.…”

Section: Resultscontrasting

confidence: 62%

“…To obtain membranes applicable for alkali diffusion dialysis, many polymer materials have been investigated, including poly (2,6-dimethyl-1,4-phenyleneoxide) (SPPO) [ 14 , 15 ], polyvinyl alcohol (PVA) [ 16 , 17 , 18 , 19 ], polyvinylidene fluoride (PVDF) [ 20 , 21 , 22 , 23 ], chlorosulfonated polyethylene (CSM) [ 24 ], and so on. Among these polymer matrix materials, PVA possesses good hydrophilicity and membrane-forming abilities and has drawn researchers’ attentions.…”

Section: Introductionmentioning

confidence: 99%

“…The authors considered that the improved membrane permeability and solute selectivity was due to the incorporation of PSSNa, which resulted in increased membrane pore size, surface hydrophilicity, and negative charge. Dai et al [ 18 ] prepared PVA-based membranes by directly blending 3-mercaptopropyltriethoxysilane and benzaldehyde disulfonic acid disodium salt with PVA solution. The –CHO and –Si(OC 2 H 5 ) 3 groups can easily cross-link with –OH groups through acetal condensation and sol-gel reactions, endowing the membranes with exchangeable groups and cross-linked structures.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis

et al. 2020

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Carboxyl-type boronic acid copolymers (CBACs) were synthesized by a radical polymerization method and used for the preparation of polyvinyl alcohol (PVA)-based composite membranes via a solution mixture method. The as-prepared composite membranes exhibited a water uptake (WR) of 122.6–150.0%, an ion exchange capacity (IEC) of 0.0147–0.0518 mmol g−1, and excellent mechanical (elongation at break (Eb) of 103.8–148.4%, tensile strength (TS) of 38.7–58.6 MPa) and thermal stability. The alkali resistances of the as-prepared membranes were tested by immersing the samples into 2 mol L−1 NaOH solutions at 25 °C for 60 h, and the results were encouraging: the mass loss and swelling degree of the as-prepared membranes were in the ranges of 1.9–5.9% and 222.6–241.9%, respectively. The separation performances of the as-prepared membranes were evaluated by the diffusion dialysis (DD) process with an NaOH/Na2WO4 mixture at room temperature. The results demonstrated that the dialysis coefficients of hydroxide (UOH) were in the range of 0.0147–0.0347 m h−1, and the separation factors (S) were in the range of 29.5–62.6. The introduced carboxyl groups from CBACs and the –OH groups from PVA were both deemed to play significant roles in the promotion of ion transport: the –COO− groups formed negatively charged transport channels for Na+ by electrostatic attraction, and the –OH groups promoted the transport of OH− via hydrogen bonding.

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Section: Resultscontrasting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis

et al. 2020

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“…To solve this issue, various modification techniques are employed for PVA membranes, such as blending, hybridization, grafting, and crosslinking . Among them, crosslinking modification is a convenient and efficient technique, which can be realized by chemical crosslinkers, freezing, irradiation, and so on. For chemical crosslinking, the physicochemical properties and separation performance of the crosslinked membranes can be optimized with various crosslinker concentrations and different crosslinking times …”

Section: Introductionmentioning

confidence: 99%

Properties and pervaporation performance of poly(vinyl alcohol) membranes crosslinked with various dianhydrides

Shen

et al. 2018

J of Applied Polymer Sci

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In this work, three dianhydrides with similar chemical structures, 3,3 0 ,4,4 0 -benzophenone tetracarboxylic dianhydride (BTDA), 4,4 0 -oxydiphthalic anhydride (ODPA), and pyromellitic dianhydride (PMDA), are employed for the crosslinking modification of poly(vinyl alcohol) (PVA) membranes for ethanol dehydration via pervaporation. The changes in crosslinking degree, surface hydrophilicity, and glass-transition temperature are investigated and compared. Compared to the pure PVA membrane, all crosslinked membranes show higher fluxes but lower separation factors, because of the higher fractional free volume and the lower hydrophilicity by the crosslinking of the PVA matrix, respectively. In addition, all crosslinked PVA membranes exhibit similar flux, and the separation factor presents a decreasing order of PVA/PMDA-2 > PVA/ODPA-2 > PVA/BTDA-2, which is in the reverse order of their hydrophilicity, probably because of the reduction in the swelling resistance. With the PMDA content increasing from 0.01 to 0.04 mol/(kg PVA) in the PVA/PMDA crosslinked membranes, the crosslinking degree is enhanced and the hydrogen bonding is weakened, resulting in a flux increase from 120.2 to 190.8 g m 22 h 21 , but the separation factor declines from 306 to 58. This work is believed to provide useful insight on the chemical modification of PVA membranes for pervaporation and other membrane-based separation applications.

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“…Hence, PVA based hybrid membranes have been developed with different cross-linkers and cation exchange groups to improve the DD performance for alkali recovery [17]. The -Si-OCH3 cross-linked PVA based hybrid cation exchange membranes have been used in many DD applications for alkaline separation [26].…”

Section: Introductionmentioning

confidence: 99%

Novel Silica Functionalized Monosodium Glutamate/PVA Cross-linked Membranes for Alkali Recovery by Diffusion Dialysis

Ashraf

Islam

Butt

2021

Preprint

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In this work, two types of silica functionalized monosodium glutamate (GMSG and VMSG)/ poly(vinyl alcohol) (PVA) were cross-linked by sol-gel process to prepare novel hybrid cation exchange membranes (CEMs). The prepared membranes were systematically characterized by FTIR, ion exchange capacity (IEC), TGA, water uptake, water swelling, mechanical strength and diffusion dialysis (DD) performance for alkali separation using NaOH/Na2WO4 solution. The FTIR peaks around 1260-1350 cm−1 confirmed the secondary C−N linkages. The cross-linking between GMSG/VMSG and PVA was verified by the presence of stretching peaks of Si−O−C, Si−O−Si, C−O−C, and −C(=O)−O−C groups between 1080-1120 cm−1. TGA results indicated that GMSG membranes showed relatively high thermal stability as compared to VMSG membranes. Water uptake and degree of swelling decreased while IEC values increased with the increase of GMSG/VMSG content in membrane matrix. The mechanical properties of the membranes improved up to 40% GMSG/VMSG content. The NaOH dialysis coefficient (UOH) values improved while values of separation factor (S) declined with the increase of GMSG/VMSG content. Finally, the effect of temperature was studied and it was found that increase in temperature from 25 to 45 °C resulted in increase of diffusion coefficient and decrease of separation factor for both GMSG/VMSG crossed-linked with PVA membranes.

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Crosslinked PVA-based hybrid membranes containing di-sulfonic acid groups for alkali recovery

Cited by 20 publications

References 50 publications

Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis

Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis

Properties and pervaporation performance of poly(vinyl alcohol) membranes crosslinked with various dianhydrides

Novel Silica Functionalized Monosodium Glutamate/PVA Cross-linked Membranes for Alkali Recovery by Diffusion Dialysis

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Crosslinked PVA-based hybrid membranes containing di-sulfonic acid groups for alkali recovery

Cited by 20 publications

References 50 publications

Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis

Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis

Properties and pervaporation performance of poly(vinyl alcohol) membranes crosslinked with various dianhydrides

Novel Silica Functionalized Monosodium Glutamate/PVA&nbsp;Cross-linked Membranes for Alkali Recovery by Diffusion Dialysis

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Product

Resources

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Novel Silica Functionalized Monosodium Glutamate/PVA Cross-linked Membranes for Alkali Recovery by Diffusion Dialysis