Cation exchange hybrid membranes prepared from PVA and multisilicon copolymer for application in alkali recovery

Hao, Jianwen; Wu, Yonghui; Xu, Tongwen

doi:10.1016/j.memsci.2012.09.024

Cited by 23 publications

(19 citation statements)

References 23 publications

(37 reference statements)

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“…The DD performances are evaluated by the dialysis coefficient of NaOH (U OH ) and separation factor (S OH/AlO2 ). [23,29]. The OH -ions may be transported through the formation and broken of hydrogen bonds along the -OH groups, which is in accordance with the adsorption-desorption mechanism [5,45].…”

Section: Diffusion Dialysis (Dd) Of the Membranes Oxidized By Fenton'supporting

confidence: 57%

“…Hence, the -CHO group can not fully restrict the swelling effect of multiple -SO 3 Na groups. The IEC P values are in the range of 0.98 -1.36 mmol/g, which are higher than those of other reported PVA based membranes, such as 0.14 -0.44 mmol/g [29], 0.76 -0.90 mmol/g [23] or 0.61 -1.21 mmol/g [33]. The higher IEC P values are partly attributed to the effective oxidation of -SH groups.…”

Section: Water Uptake (W R ) Linear Expansion Ratio (Ler) and Ion-excontrasting

confidence: 56%

“…The separation factor (S) with respect to one species over another was given as the ratio of dialysis coefficients (U) of the two species present in the solution. U can be expressed by the following formula [29]:…”

Section: Diffusion Dialysis (Dd)mentioning

confidence: 99%

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

Dai

Mondal

et al. 2017

Separation and Purification Technology

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Section: Diffusion Dialysis (Dd) Of the Membranes Oxidized By Fenton'supporting

confidence: 57%

Section: Water Uptake (W R ) Linear Expansion Ratio (Ler) and Ion-excontrasting

confidence: 56%

See 1 more Smart Citation

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

Dai

Mondal

et al. 2017

Separation and Purification Technology

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“…For membranes heated at 100 °C, the TS and E b of all the samples are in the range of 40.7–49.9 MPa and 52.1–121.1%, respectively. The TS of the membranes is higher than those of previous PVA-based ion exchangeable membranes but exhibits similar trends [13]. The reasons might be as follows: The addition of boronic acid copolymer enhanced the membrane crosslinking degree and thus TS increased first; excessive content of boronic acid copolymer affected the aggregation of the PVA main chains and thus the TS decreased when the dosage of boronic acid copolymer was higher than 2%.…”

Section: Resultsmentioning

confidence: 70%

Composite Cationic Exchange Membranes Prepared from Polyvinyl Alcohol (PVA) and Boronic Acid Copolymers for Alkaline Diffusion Dialysis

et al. 2018

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Boronic acid copolymers with a large number of functional groups were obtained via a free radical polymerization method. The corresponding composite membranes for alkaline diffusion dialysis (DD) were prepared by a crosslinking reaction between polyvinyl alcohol (PVA) and the as-obtained boronic acid copolymers. The composite membranes possessed water uptake (WR) of 122.1–194.4%, ion exchange capacities (IECs) of 0.79–1.17 mmol/g, as well as both good mechanical stability (tensile strength of 40.7–49.9 MPa and elongation at break of 52.1–121.1%) and thermal stability. The as-prepared membranes were stable in 2 M NaOH solution at 65 °C with a swelling degree and mass loss of as-prepared membranes in the range of 305–368% and 9.2–22%, respectively. A NaOH/Na2WO4 mixture was used to investigate the separation properties of as-prepared membranes via the DD process. Results indicated that the dialysis coefficients of OH− (UOH) were in the range of 0.0079–0.0150 m/h, while the separation factors (S) were in the range of 26.6–53.2. The functional groups from boronic acid copolymer and –OH from PVA were demonstrated to promote the ion transport synergistically.

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“…The microstructure of the membranes was observed by microscopic scanning electron microscopy (S-4800, Hitachi Company, Tokyo, Japan) after gold coating treatment. The water uptake (W R ), ion exchange capacities (IECs), and alkali resistance of the membrane samples were tested by the methods that have been described in our previous works, and two parallel samples were tested synchronously [ 27 , 28 ].…”

Section: Methodsmentioning

confidence: 99%

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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Cation exchange hybrid membranes prepared from PVA and multisilicon copolymer for application in alkali recovery

Cited by 23 publications

References 23 publications

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

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

Composite Cationic Exchange Membranes Prepared from Polyvinyl Alcohol (PVA) and 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

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