Effect of silver-nanoparticles generated in poly (vinyl alcohol) membranes on ethanol dehydration via pervaporation

Selim, Asmaa; Toth, András Jozsef; Fózer, Dániel; Haáz, Enikő; Valentínyi, Nóra; Nagy, Tibor; Kéri, Orsolya; Bakoš, L.; Szilágyi, Imre Miklós; Mizsey, Péter

doi:10.1016/j.cjche.2018.11.002

Cited by 21 publications

(22 citation statements)

References 62 publications

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“…The pervaporation desalination performance of the PVA and PVA-Lap MMMs was studied using a labscale P-28 membrane unit from CM-Celfa Membranetechnik AG vacuum Pervaporation apparatus as published in our previous paper [13]. The membrane under test was kept on a sintered disc in the membrane cell.…”

Section: Pervaporation Experimentsmentioning

confidence: 99%

“…The mass transport process in PV is based on the widely-accepted solution-diffusion model. Typically, a preheated liquid mixture is directly contacted with the feed side of a PV membrane and leaves the membrane in a gaseous state which is then condensed by a cold medium on permeate side which is maintained by vacuum [13]. According to the solution-diffusion model for PV desalination, the adsorbed water molecules on the surface of the hydrophilic membrane are posteriorly diffuse through the membrane and eventually converted to vapor on the permeate side.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of PVA/GA/Laponite membranes to enhance pervaporation desalination performance

Selim

Toth

Haáz

et al. 2019

Separation and Purification Technology

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Pervaporation (PV) has shown great promise in water desalination technology. In this work, laponite XLG-Poly (vinyl alcohol) (PVA-Lap) mixed matrix membranes (MMMs) were fabricated to investigate the elaboration of desalination of high-salinity water by pervaporation. The influence of laponite content on the morphology, chemical structure and hydrophilicity of the membranes was investigated. In addition, salt transport properties in the membranes were observed. Moreover, the effect of different laponite content in the PVA matrix on the desalination performance was observed at temperatures from 40°C to 70 °C and feed solutions with up to 10 wt% NaCl. The prepared MMMs showed higher hydrophilicity and roughness of the surface and higher mechanical stability. The higher water flux of 58.6 kg/m 2 .h with a salt rejection over 99.9 % was achieved using 2 wt% laponite XLG MMMs desalinating 3 wt% aqueous NaCl solution at 70 °C. The salt permeability in the membrane was lower by two orders of magnitude than that of water. The water/salt selectivity increased, while the water permeability decreased, with increasing of laponite content in the membrane.

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Section: Pervaporation Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of PVA/GA/Laponite membranes to enhance pervaporation desalination performance

Selim

Toth

Haáz

et al. 2019

Separation and Purification Technology

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“…By maintaining the vacuum, the collected vapors are condensed by cold medium. 14 Hence, the membrane is the core of the PV process, its type, material, and intrinsic properties are the most critical factors to achieve high separation performance.…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of a Laponite/PVA Mixed Matrix Membrane for Efficient and Sustainable Pervaporative Dehydration of C1–C3 Alcohols

et al. 2020

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The exfoliation method was applied for the preparation of high-water selective mixed matrix membranes (MMMs), especially for the dehydration of C1–C3 alcohol–water solutions. Herein, a facile and easy method was employed to fabricate physically cross-linked Laponite nanosilicate clay–PVA MMMs without additional cross-linking by a one-step synthesis route for water dehydration from methanol, ethanol, and isopropanol aqueous solutions. The morphologies, chemical structures, thermal stabilities, and surface hydrophilicity of Laponite–PVA MMMs were investigated properly by different characterization techniques. The Laponite concentration has affected the fractional free volume of the membranes, as proven by positron annihilation lifetime spectroscopy analysis. The MMMs displayed both a significant improvement in the separation factor and remarkable enhancement in the permeation fluxes for the three alcohol systems. The influence of the operating temperature on the MMM performance was investigated for the methanol/water solution. The methanol permeability was 100-fold lower than that of the water, indicating that the membranes are more water selective. Particularly, the Laponite–PVA membrane with 5 mg/mL Laponite loading exhibits excellent separation efficiency for C1–C3 dehydration having water permeabilities higher than most other polymeric membranes from the other literature studies of 2.82, 2.08, and 1.56 mg m –1 h –1 kPa –1 for methanol, ethanol, and isopropanol/water systems, respectively. This membrane development allows a more efficient and sustainable separation of aqueous alcoholic mixtures.

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“…In the PV process, the driving force is generated on the membrane sides; mainly, the feed mixture is heated up to a specific temperature then penetrates through the membrane to be converted to gas and leave from the permeate side. By maintaining the vacuum, the collected vapors are condensed by a cold medium [ 15 ]. Hence, the membrane is the core of the PV process; its type, material, and intrinsic properties are the most critical factors to achieve high separation performance.…”

Section: Introductionmentioning

confidence: 99%

“…This is credited to their high sorption affinity towards the water and low rigidity of those polymers, which results in lowering the water selectivity and increase the permeability in a trade-off trend [ 17 ]. In an attempt to inhibit this phenomenon, different modifications are reported, such as chemical cross-linking, heat treatment, blending with another polymer, grafting [ 18 , 19 , 20 ], as well as mixing with inorganic fillers [ 15 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Pervaporative Dehydration of Methanol Using PVA/Nanoclay Mixed Matrix Membranes: Experiments and Modeling

et al. 2020

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Encouraged by the industrial problem of removing water from methanol solutions, a simple exfoliation method is applied to prepare polyvinyl alcohol (PVA)/laponite nanoclay mixed matrix membranes (MMMs). The membranes are used for the pervaporative dehydration of the methanol-water solution. The influence of the nanoclay content on the pervaporation performance is investigated. The results show that the PVA10 membrane containing 10 wt% Laponite loading exhibits excellent separation efficiency; therefore, all the experimental work is continued using the same membrane. Additionally, the effects of feed concentration and temperature on methanol dehydration performance are thoroughly investigated. The temperatures are ranging from 40–70 °C and the water feed concentrations from 1–15 wt% water. A maximum separation factor of 1120 can be observed at 40 °C and the feed water concentration of 1 wt%. Remarkably, two solution–diffusion models, the Rautenbach (Model I) and modified method by Valentínyi et al. (Model II), are used and compared to evaluate and describe the pervaporation performance of the mixed matrix membrane. Model II proves to be more appropriate for the modeling of pervaporative dehydration of methanol than Model I. This work demonstrates that PVA/nanoclay mixed matrix membranes prepared can efficiently remove water from methanol aqueous solution with pervaporation and the whole process can be accurately modeled with Model II.

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Effect of silver-nanoparticles generated in poly (vinyl alcohol) membranes on ethanol dehydration via pervaporation

Cited by 21 publications

References 62 publications

Preparation and characterization of PVA/GA/Laponite membranes to enhance pervaporation desalination performance

Preparation and characterization of PVA/GA/Laponite membranes to enhance pervaporation desalination performance

Facile Preparation of a Laponite/PVA Mixed Matrix Membrane for Efficient and Sustainable Pervaporative Dehydration of C1–C3 Alcohols

Pervaporative Dehydration of Methanol Using PVA/Nanoclay Mixed Matrix Membranes: Experiments and Modeling

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