scholarly journals Proton Conductivity through Polybenzimidazole Composite Membranes Containing Silica Nanofiber Mats

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1182 ◽  
Author(s):  
Escorihuela ◽  
García-Bernabé ◽  
Montero ◽  
Andrio ◽  
Sahuquillo ◽  
...  
Keyword(s):  
Composite Membranes ◽  
Electrospinning Process ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Efficient Energy ◽  
The Past ◽  
Polar Groups ◽  
Nanofiber Mats ◽  
Thermal Stability Of ◽  
Energy Converting

The quest for sustainable and more efficient energy-converting devices has been the focus of researchers′ efforts in the past decades. In this study, SiO2 nanofiber mats were fabricated through an electrospinning process and later functionalized using silane chemistry to introduce different polar groups OH (neutral), SO3H (acidic) and NH2 (basic). The modified nanofiber mats were embedded in PBI to fabricate mixed matrix membranes. The incorporation of these nanofiber mats in the PBI matrix showed an improvement in the chemical and thermal stability of the composite membranes. Proton conduction measurements show that PBI composite membranes containing nanofiber mats with basic groups showed higher proton conductivities, reaching values as high as 4 mS·cm−1 at 200 C.

scholarly journals 3D printed MOF-based mixed matrix thin-film composite membranes

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25658-25663
Author(s):  
Sameh K. Elsaidi ◽  
Mayur Ostwal ◽  
Lingxiang Zhu ◽  
Ali Sekizkardes ◽  
Mona H. Mohamed ◽  
...  
Keyword(s):  
Thin Film ◽  
3D Printing ◽  
Composite Membranes ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Film Composite ◽  
Thin Film Composite ◽  
3D Printed ◽  
Matrix Membranes

An electrospray 3D printing approach for fabricating thin-film composite mixed-matrix membranes (TFC MMM) with a thickness of 2–3 μm.

Zeolitic imidazolate framework composite membranes and thin films: synthesis and applications

2014 ◽  
Vol 43 (13) ◽  
pp. 4470-4493 ◽  
Author(s):  
Jianfeng Yao ◽  
Huanting Wang
Keyword(s):  
Thin Films ◽  
Composite Membranes ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Zeolitic Imidazolate Framework ◽  
Recent Developments ◽  
Matrix Membranes

The recent developments of zeolitic imidazolate framework (ZIF) membranes/films, ZIF–polymer mixed matrix membranes and their applications are reviewed in this article.

Liquid-like CNT/SiO2 nanoparticle organic hybrid materials as fillers in mixed matrix composite membranes for enhanced CO2-selective separation

2019 ◽  
Vol 43 (30) ◽  
pp. 11949-11958 ◽  
Author(s):  
Dechao Wang ◽  
Yaping Zheng ◽  
Dongdong Yao ◽  
Zhiyuan Yang ◽  
Yangyang Xin ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Matrix Composite ◽  
Composite Membranes ◽  
Selective Separation ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Organic Hybrid ◽  
Sio2 Nanoparticle ◽  
Core Composition

Liquid-like nanoparticle organic hybrid materials with core/canopy/corona were used as fillers in Pebax-1657 matrix to fabricate mixed-matrix membranes. The effect of composite core composition on CO2/N2 separation performance was systematically investigated.

Effect of TiO2 Incorporation on Separation Performance of Pure PES and PES/PVAc Blend Membranes

2018 ◽  
Vol 923 ◽  
pp. 35-39 ◽  
Author(s):  
Mohd Afzan Abdullah ◽  
Hilmi Mukhtar ◽  
Yeong Yin Fong ◽  
Maizatul Shima Shaharun ◽  
Hafiz Abdul Mannan
Keyword(s):  
Thermal Stability ◽  
Polymer Blend ◽  
Polyvinyl Acetate ◽  
Research Work ◽  
The Other ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Blend Membranes ◽  
Thermal Stability Of

In this research work, polyethersulfone (PES) and polyethersulfone/polyvinyl acetate (PES/PVAc) blend were incorporated with 10 wt.% of TiO2 nanoparticles to form mixed matrix membranes (MMM). FESEM and TGA were utilized respectively to scrutinize the morphology and thermal stability of the developed membranes. Permeation tests of ideal CO2 and CH4 gases were also conducted to assess the separation performance of resultant membranes. The PES/PVAc/TiO2 polymer blend MMM was found to be the most thermally resistant and has the highest CO2 permeability and CO2/CH4 selectivity as compared to the other membranes.

scholarly journals Effect of Graphene Oxide Synthesis Method on Properties and Performance of Polysulfone-Graphene Oxide Mixed Matrix Membranes

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 769 ◽  
Author(s):  
Safae Sali ◽  
Hamish R. Mackey ◽  
Ahmed A. Abdala
Keyword(s):  
Graphene Oxide ◽  
Water Flux ◽  
Synthesis Method ◽  
Composite Membranes ◽  
Mixed Matrix Membranes ◽  
Great Promise ◽  
Mixed Matrix ◽  
Water Emulsion ◽  
The Matrix ◽  
And Performance

Graphene oxide (GO) has shown great promise as a nanofiller to enhance the performance of mixed matrix composite membranes (MMMs) for water treatment applications. However, GO can be prepared by various synthesis routes, leading to different concentrations of the attached oxygen functional groups. In this research, GO produced by the Hummers’, Tour, and Staudenmaier methods were characterized and embedded at various fractions into the matrix of polysulfone (PSf) and used to prepare microfiltration membranes via the phase inversion process. The effects of the GO preparation method and loading on the membrane characteristics, as well as performance for oil removal from an oil-water emulsion, are analyzed. Our results reveal that GO prepared by the Staudenmaier method has a higher concentration of the more polar carbonyl group, increasing the membrane hydrophilicity and porosity compared to GO prepared by the Hummers’ and Tour methods. On the other hand, the Hummers’ and Tour methods produce GO with larger sheet size, and are more effective in enhancing the mechanical properties of the PSf membrane. Finally, all MMMs exhibited improved water flux (up to 2.7 times) and oil rejection, than those for the control PSf sample, with the optimum GO loading ranged between 0.1–0.2 wt%.

scholarly journals Pervaporation Zeolite-Based Composite Membranes for Solvent Separations

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1242
Author(s):  
Roberto Castro-Muñoz ◽  
Grzegorz Boczkaj
Keyword(s):  
Gas Separation ◽  
Composite Membranes ◽  
Mixed Matrix Membranes ◽  
Membrane Separations ◽  
Future Perspectives ◽  
Mixed Matrix ◽  
Selective Membrane ◽  
Molecular Sieving ◽  
Matrix Membranes

Thanks to their well-defined molecular sieving and stability, zeolites have been proposed in selective membrane separations, such as gas separation and pervaporation. For instance, the incorporation of zeolites into polymer phases to generate composite (or mixed matrix) membranes revealed important advances in pervaporation. Therefore, the goal of this review is to compile and elucidate the latest advances (over the last 2-3 years) of zeolite applications in pervaporation membranes either combining zeolites or polymers. Here, particular emphasis has been focused on relevant insights and findings in using zeolites in pervaporative azeotropic separations and specific aided applications, together with novel concepts of membranes. A brief background of the pervaporation process is also given. According to the findings of this review, we provide future perspectives and recommendations for new researchers in the field.

scholarly journals Metal Organic Framework Based Polymer Mixed Matrix Membranes: Review on Applications in Water Purification

Membranes ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 88 ◽  
Author(s):  
Asmaa Elrasheedy ◽  
Norhan Nady ◽  
Mohamed Bassyouni ◽  
Ahmed El-Shazly
Keyword(s):  
Water Purification ◽  
Composite Membranes ◽  
Filler Loading ◽  
Polymeric Membranes ◽  
Commercial Application ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Synthesis Techniques ◽  
Metal Organic ◽  
Matrix Membranes

Polymeric membranes have been widely employed for water purification applications. However, the trade-off issue between the selectivity and permeability has limited its use in various applications. Mixed matrix membranes (MMMs) were introduced to overcome this limitation and to enhance the properties and performance of polymeric membranes by incorporation of fillers such as silica and zeolites. Metal-organic frameworks (MOFs) are a new class of hybrid inorganic–organic materials that are introduced as novel fillers for incorporation in polymeric matrix to form composite membranes for different applications especially water desalination. A major advantage of MOFs over other inorganic fillers is the possibility of preparing different structures with different pore sizes and functionalities, which are designed especially for a targeted application. Different MMMs fabrication techniques have also been investigated to fabricate MMMs with pronounced properties for a specific application. Synthesis techniques include blending, layer-by-layer (LBL), gelatin-assisted seed growth and in situ growth that proved to give the most homogenous dispersion of MOFs within the organic matrix. It was found that the ideal filler loading of MOFs in different polymeric matrices is 10%, increasing the filler loading beyond this value led to formation of aggregates that significantly decreased the MOFs-MMMs performance. Despite the many merits of MOFs-MMMs, the main challenge facing the upscaling and wide commercial application of MOFs-MMMs is the difficult synthesis conditions of the MOFs itself and the stability and sustainability of MOFs-MMMs performance. Investigation of new MOFs and MOFs-MMMs synthesis techniques should be carried out for further industrial applications. Among these new synthesis methods, green MOFs synthesis has been highlighted as low cost, renewable, environmentally friendly and recyclable starting materials for MOFs-MMMs. This paper will focus on the investigation of the effect of different recently introduced MOFs on the performance of MOFs-MMMs in water purification applications.

scholarly journals Graphene Oxide-PES-Based Mixed Matrix Membranes for Controllable Antibacterial Activity against Salmonella typhi and Water Treatment

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Haleema Tariq Bhatti ◽  
Nasir M. Ahmad ◽  
Muhammad Bilal Khan Niazi ◽  
Muhammad Azeem Ur Rehman Alvi ◽  
Naveed Ahmad ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Composite Membranes ◽  
Salmonella Typhi ◽  
Mixed Matrix Membranes ◽  
Inversion Method ◽  
Hydroxyl Groups ◽  
Mixed Matrix ◽  
Good Potential ◽  
Phase Inversion Method

The present work is focused on preparation, characterization, and antibacterial activity evaluation of graphene oxide/polyethersulfone mixed matrix filtration membranes. Graphene oxide (GO) was synthesized via improved Hummer’s method and characterized by XRD, FTIR, and SEM. FT-IR spectra showed the presence of carboxylic acid and hydroxyl groups on GO nanosheets. Different concentrations of the synthesized GO at 0.25, 0.5, and 1.0 wt. % were incorporated in polyethersulfone (PES) matrix via phase inversion method to fabricate GO-PES membranes. Increasing porosity and formation of wider, finger-like channels were observed with increased GO concentrations relative to pristine membranes as evident from scanning electron microscopy (SEM) micrographs of the fabricated membranes. However, membranes prepared with 1 wt. % GO appear to contain aggregation and narrowing of pore morphology. GO-incorporated membranes demonstrated enhanced flux, water-retaining capacities, and wettability as compared to pristine PES membranes. Shake flask and colony counting methods were employed to carry out antibacterial testing of synthesized GO and fabricated GO-PES membranes against Salmonella typhi (S. typhi)—a gram-negative bacteria present in water that is known as causative agent of typhoid. Synthesized GO showed significant reduction up to 70.8% in S. typhi cell count. In the case of fabricated membranes, variable concentrations of GO are observed to significantly influence the percentage viability of S. typhi, with reduction percentages observed at 41, 60, and 69% for 0.25, 0.5, and 1.0 wt. % GO-incorporated membranes relative to 17% in the case of pristine PES membranes. The results indicate a good potential for applying GO/PES composite membranes for water filtration application.

Long-Term Stable Metal Organic Framework (MOF) Based Mixed Matrix Membranes for Ultrafiltration

2020 ◽  
Author(s):  
Muayad Al-shaeli ◽  
Stefan J. D. Smith ◽  
Shanxue Jiang ◽  
Huanting Wang ◽  
Kaisong Zhang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Mixed Matrix Membranes ◽  
Recovery Ratio ◽  
Mixed Matrix ◽  
Water Contact ◽  
Membrane Performance ◽  
Metal Organic ◽  
Matrix Membranes

<p>In this study, novel <a>mixed matrix polyethersulfone (PES) membranes</a> were synthesized by using two different kinds of metal organic frameworks (MOFs), namely UiO-66 and UiO-66-NH<sub>2</sub>. The composite membranes were characterised by SEM, EDX, FTIR, PXRD, water contact angle, porosity, pore size, etc. Membrane performance was investigated by water permeation flux, flux recovery ratio, fouling resistance and anti-fouling performance. The stability test was also conducted for the prepared mixed matrix membranes. A higher reduction in the water contact angle was observed after adding both MOFs to the PES and sulfonated PES membranes compared to pristine PES membranes. An enhancement in membrane performance was observed by embedding the MOF into PES membrane matrix, which may be attributed to the super-hydrophilic porous structure of UiO-66-NH<sub>2</sub> nanoparticles and hydrophilic structure of UiO-66 nanoparticles that could accelerate the exchange rate between solvent and non-solvent during the phase inversion process. By adding the MOFs into PES matrix, the flux recovery ratio was increased greatly (more than 99% for most mixed matrix membranes). The mixed matrix membranes showed higher resistance to protein adsorption compared to pristine PES membranes. After immersing the membranes in water for 3 months, 6 months and 12 months, both MOFs were stable and retained their structure. This study indicates that UiO-66 and UiO-66-NH<sub>2</sub> are great candidates for designing long-term stable mixed matrix membranes with higher anti-fouling performance.</p>

Porous covalent triazine piperazine polymer (CTPP)/PEBAX mixed matrix membranes for CO2/N2 and CO2/CH4 separations

2019 ◽  
Vol 591 ◽  
pp. 117348 ◽  
Author(s):  
Roshni L. Thankamony ◽  
Xiang Li ◽  
Swapan K. Das ◽  
Mayur M. Ostwal ◽  
Zhiping Lai
Keyword(s):  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Matrix Membranes
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