scholarly journals Quaternized Diaminobutane/Poly(vinyl alcohol) Cross-Linked Membranes for Acid Recovery via Diffusion Dialysis

Membranes ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 786
Author(s):  
Muhammad Ashraf ◽  
Atif Islam ◽  
Muhammad Arif Butt ◽  
Hafiz Abdul Mannan ◽  
Rafi Ullah Khan ◽  
...  
Keyword(s):  
Water Uptake ◽  
Vinyl Alcohol ◽  
Thermo Gravimetric Analysis ◽  
Expansion Ratio ◽  
Iron Chloride ◽  
Poly Vinyl Alcohol ◽  
Anion Exchange Membranes ◽  
Gravimetric Analysis ◽  
Acid Recovery ◽  
Diffusion Dialysis

Diffusion dialysis (DD) using anion exchange membranes (AEM) is an effective process for acid recovery and requires the preparation of suitable materials for AEMs, characterized by unique ions transport properties. In this work, novel AEMs composed of quaternized diaminobutane (QDAB) and poly(vinyl alcohol) (PVA) were cross-linked by tetraethoxysilane (TEOS) via the sol–gel process. The prepared AEMs were systematically characterized by Fourier-transform infrared (FTIR) spectroscopy, ion-exchange capacity (IEC) analysis, thermo gravimetric analysis (TGA), water uptake, linear expansion ratio (LER), and mechanical strength determination, scanning electron microscopy (SEM), and DD performance analysis for acid recovery using a hydrochloric acid/iron chloride (HCl/FeCl2) aqueous mixture and varying the QDAB content. The prepared AEMs exhibited IEC values between 0.86 and 1.46 mmol/g, water uptake values within 71.3 and 47.8%, moderate thermal stability, tensile strength values in the range of 26.1 to 41.7 MPa, and elongation from 68.2 to 204.6%. The dialysis coefficient values were between 0.0186 and 0.0295 m/h, whereas the separation factors range was 24.7–44.1 at 25 °C. The prepared membranes have great potential for acid recovery via diffusion dialysis.

scholarly journals Poly(vinyl alcohol)-based Anion Exchange Membranes for Alkaline Polymer Electrolyte Fuel Cells

2021 ◽  
Vol 10 (3) ◽  
pp. 435-443
Author(s):  
Asep Muhamad Samsudin ◽  
Sigrid Wolf ◽  
Michaela Roschger ◽  
Viktor Hacker
Keyword(s):  
Fuel Cells ◽  
Anion Exchange ◽  
Water Uptake ◽  
Vinyl Alcohol ◽  
Functional Group ◽  
Exchange Capacity ◽  
Poly Vinyl Alcohol ◽  
Anion Exchange Membranes ◽  
Direct Ethanol Fuel Cells ◽  
Alkaline Polymer Electrolyte

Crosslinked anion exchange membranes (AEMs) made from poly(vinyl alcohol) (PVA) as a backbone polymer and different approaches to functional group introduction were prepared by means of solution casting with thermal and chemical crosslinking. Membrane characterization was performed by SEM, FTIR, and thermogravimetric analyses. The performance of AEMs was evaluated by water uptake, swelling degree, ion exchange capacity, OH- conductivity, and single cell tests. A combination of quaternized ammonium poly(vinyl alcohol) (QPVA) and poly(diallyldimethylammonium chloride) (PDDMAC) showed the highest conductivity, water uptake, and swelling among other functional group sources. The AEM with a combined mass ratio of QPVA and PDDMAC of 1:0.5 (QPV/PDD0.5) has the highest hydroxide conductivity of 54.46 mS cm-1. The single fuel cell tests with QPV/PDD0.5 membrane yield the maximum power density and current density of 8.6 mW cm-2 and 47.6 mA cm-2 at 57 °C. This study demonstrates that PVA-based AEMs have the potential for alkaline direct ethanol fuel cells (ADEFCs) application.

scholarly journals Innovative BPPO Anion Exchange Membranes Formulation Using Diffusion Dialysis-Enhanced Acid Regeneration System

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 311
Author(s):  
Muhammad Imran Khan ◽  
Majeda Khraisheh ◽  
Fares AlMomani
Keyword(s):  
Anion Exchange ◽  
Room Temperature ◽  
Feed Solution ◽  
Exchange Capacity ◽  
Anion Exchange Membranes ◽  
Regeneration System ◽  
Waste Streams ◽  
Acid Recovery ◽  
Aqueous Waste ◽  
Diffusion Dialysis

Recycling of acid from aqueous waste streams is crucial not only from the environmental point of view but also for maturing the feasible method (diffusion dialysis). Anion exchange membrane (AEM)–based diffusion dialysis process is one of the beneficial ways to recover acid from aqueous waste streams. In this article, the synthesis of a series of brominated poly (2, 6–dimethyl-1, 4–phenylene oxide) (BPPO)-based anion exchange membranes (AEMs) through quaternization with triphenylphosphine (TPP) were reported for acid recovery via diffusion dialysis process. The successful synthesis of the prepared membranes was confirmed by Fourier transform infrared (FTIR) spectroscopy. The as-synthesized anion exchange membranes represented water uptake (WR) of 44 to 66%, ion exchange capacity of (IEC) of 1.22 to 1.86 mmol/g, and linear swelling ratio (LSR) of 8 to 20%. They exhibited excellent thermal, mechanical, and acid stability. They showed homogeneous morphology. The acid recovery performance of the synthesized AEMs was investigated in a two compartment stack using simulated mixture of HCl and FeCl2 as feed solution at room temperature. For the synthesized anion exchange membranes TPP–43 to TPP–100, the diffusion dialysis coefficient of acid (UH+) was in the range of 6.7 to 26.3 (10−3 m/h) whereas separation factor (S) was in the range of 27 to 49 at 25 °C. Obtained results revealed that diffusion dialysis performance of the synthesized AEMs was higher than the commercial membrane DF–120B (UH+ = 0.004 m/h, S = 24.3) at room temperature. It showed that the prepared AEMs here could be excellent candidates for the diffusion dialysis process.

scholarly journals Development of Nervilia fordii Extract-Loaded Electrospun PVA/PVP Nanocomposite for Antioxidant Packaging

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1728
Author(s):  
Peng Wen ◽  
Teng-Gen Hu ◽  
Yan Wen ◽  
Ke-Er Li ◽  
Wei-Peng Qiu ◽  
...  
Keyword(s):  
Food Packaging ◽  
Thermo Gravimetric Analysis ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Poly Vinyl Alcohol ◽  
Total Phenolic ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Phenolic And Flavonoid ◽  
Thermal Stability Of

An ethyl acetate extract from of Nervilia fordii (NFE) with considerable suppression activity on lipid peroxidation (LPO) was first obtained with total phenolic and flavonoid contents and anti-LPO activity (IC50) of 86.67 ± 2.5 mg GAE/g sample, 334.56 ± 4.7 mg RE/g extract and 0.307 mg/mL, respectively. In order to improve its stability and expand its application in antioxidant packaging, the nano-encapsulation of NFE within poly(vinyl alcohol) (PVA) and polyvinyl(pyrrolidone) (PVP) bio-composite film was then successfully developed using electrospinning. SEM analysis revealed that the NFE-loaded fibers exhibited similar morphology to the neat PVA/PVP fibers with a bead-free and smooth morphology. The encapsulation efficiency of NFE was higher than 90% and the encapsulated NFE still retained its antioxidant capacity. Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD) analysis confirmed the successful encapsulation of NFE into fibers and their compatibility, and the thermal stability of which was also improved due to the intermolecular interaction demonstrated by thermo gravimetric analysis (TGA). The ability to preserve the fish oil’s oxidation and extend its shelf-life was also demonstrated, suggesting the obtained PVA/PVP/NFE fiber mat has the potential as a promising antioxidant food packaging material.

High-performance porous anion exchange membranes for efficient acid recovery from acidic wastewater by diffusion dialysis

2021 ◽  
Vol 624 ◽  
pp. 119116
Author(s):  
Jiuyang Lin ◽  
Junming Huang ◽  
Jing Wang ◽  
Junwei Yu ◽  
Xinqiang You ◽  
...  
Keyword(s):  
Anion Exchange ◽  
High Performance ◽  
Anion Exchange Membranes ◽  
Acid Recovery ◽  
Diffusion Dialysis ◽  
Acidic Wastewater

Development of quaternarized poly(vinyl alcohol) anion-exchange membranes for applications in electrodialysis

2017 ◽  
Vol 134 (31) ◽  
pp. 44946 ◽  
Author(s):  
Franciélli Müller ◽  
Rafaela Andretta ◽  
Lorenzo de Oliveira Meneguzzi ◽  
Carlos Arthur Ferreira
Keyword(s):  
Anion Exchange ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Anion Exchange Membranes

Fabrication of asymmetrical diffusion dialysis membranes for rapid acid recovery with high purity

2015 ◽  
Vol 3 (47) ◽  
pp. 24000-24007 ◽  
Author(s):  
Xiaocheng Lin ◽  
Ezzatollah Shamsaei ◽  
Biao Kong ◽  
Jefferson Zhe Liu ◽  
Tongwen Xu ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Environmental Impact ◽  
Anion Exchange ◽  
High Purity ◽  
Process Efficiency ◽  
Industrial Processes ◽  
Anion Exchange Membranes ◽  
Acid Recovery ◽  
Dialysis Membranes ◽  
Diffusion Dialysis

Anion exchange membranes with fast acid permeation and high retention of salts have been fabricated to increase the process efficiency of acid recovery from various industrial processes via diffusion dialysis, thereby greatly reducing their energy consumption and environmental impact.

Graphene oxide modified porous anion exchange membranes for acid recovery through diffusion dialysis

2020 ◽  
Vol 175 ◽  
pp. 49-59
Author(s):  
Wenya Liu ◽  
Meng Li ◽  
Mengjie Sun ◽  
Xu Zhang ◽  
Cuiming Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Anion Exchange ◽  
Anion Exchange Membranes ◽  
Acid Recovery ◽  
Through Diffusion ◽  
Diffusion Dialysis
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