Anti-wetting polyvinylidene fluoride membrane incorporated with hydrophobic polyethylene-functionalized-silica to improve CO2 removal in membrane gas absorption

Rosli, Aishah; Ahmad, Abdul Latif; Low, Siew Chun

doi:10.1016/j.seppur.2019.03.094

Cited by 36 publications

(48 citation statements)

References 56 publications

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“…This resulted in a membrane with smaller pore size, which meant that the neat membrane had larger pore size compared to the composite membrane. Unfortunately, the big pores of the neat membrane caused most of the LDPE coating solution to seep into the membrane pores, leaving an insufficient amount to form the micropapillae structure necessary to lend the membrane enhanced surface roughness . Hence, the average surface roughness ( R a ) of the composite membrane with LDPE micropapillae structure was slightly higher at 0.0362 μm compared to the neat membrane at 0.0326 μm.…”

Section: Resultsmentioning

confidence: 99%

“…The performance of the membranes in regards to CO 2 absorption was assessed through an MGA test. The set‐up for the MGA rig is as shown in our previous work . AMP was used as the liquid absorbent with the gas flowing through the other side of the membrane in a cross‐flow direction, which is known to lead to a higher overall mass transfer coefficient at 100 mL min −1 .…”

Section: Methodsmentioning

confidence: 99%

“…Despite its advantages over the conventional CO 2 absorption process, MGA process has one vital flaw; incorporating a membrane in the process would increase mass transfer resistance to the absorption process . However, as long as the membrane has not been wetted by the absorbent, the membrane mass transfer resistance is negligible . On the contrary, the membrane mass transfer resistance could increase up to 60%, even if liquid absorbent penetrates into only 2% of the membrane pores, leading to a significant drop in CO 2 absorption flux.…”

Section: Introductionmentioning

confidence: 99%

“…The most obvious solution is to use hydrophobic polymer, such as polyethylene (PE), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) and polypropylene (PP). Of these, PVDF is frequently chosen for its thermal stability and high solubility in common organic solvents . Another popular strategy to enhance absorption performance and reduce membrane wetting is by incorporating fillers, such as silica into the membrane matrix.…”

Section: Introductionmentioning

confidence: 99%

“…used PP as surface coating, which showed an increase in hydrophobicity and CO 2 absorption performance. Another polymer layer, low‐density polyethylene (LDPE) also can be used to coat onto the membrane surface to increase its hydrophobicity, to improve CO 2 permeability in an extended MGA process …”

Section: Introductionmentioning

confidence: 99%

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Functionalization of silica nanoparticles to reduce membrane swelling in CO₂ absorption process

Rosli

Ahmad

Low

2019

J of Chemical Tech & Biotech

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BACKGROUND Membrane gas absorption (MGA) is an attractive alternative to conventional absorption for carbon dioxide (CO2) removal, but the performance can be severely retarded due to membrane wetting issues. In order to overcome this, silica nanoparticles functionalized with low‐density polyethylene (LDPE) were added into polyvinylidene fluoride (PVDF) membrane matrix to increase the membrane hydrophobicity and avoid changes in membrane morphology caused by membrane swelling. RESULTS The incorporation of LDPE‐functionalized silica inside the membrane enhanced the contact angle and LEPw values from 73.2° to 109.1° and 5.98 bar to 9.25 bar, respectively. These increments indicate an improvement in hydrophobicity for the LDPE‐silica/PVDF composite membrane, thus, enhanced membrane anti‐wetting ability. Furthermore, Fourier transform infrared (FTIR) analysis, field emission scanning electron microscope (FESEM) and swelling tests indicated that prolonged exposure to amine absorbent caused the serious degradation and swelling of the neat PVDF membrane with surface coated LDPE. By contrast, the wetting effects were insignificant for the LDPE‐silica/PVDF composite membrane, which led to a stable MGA performance using 2‐amino‐2‐methyl‐1‐propanol as the reactive absorbent. CONCLUSION The ability of the composite membrane to resist wetting, swelling and chemical degradation is attributed to the restriction PVDF chain movement by its intermolecular interactions with LDPE‐functionalized silica. These improvements led to the fabrication of a hydrophobic, chemically stable composite membrane that was able to show a consistent CO2 absorption flux of 8.7 × 10−4 mol m−2 s–1 over 120 h of MGA operation. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Functionalization of silica nanoparticles to reduce membrane swelling in CO₂ absorption process

Rosli

Ahmad

Low

2019

J of Chemical Tech & Biotech

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Floating Solar Materials and their Devices for Energy Conversion and Environment Remediation

Liu,

Pan,

Huang

et al. 2024

Advanced Sustainable Systems

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Floating solar materials and their devices, which can effectively solve the problems faced by powder solar materials, such as difficult recycling, poor stability, and difficult maintenance, have received widespread attention in recent years. However, it is still in the early stage of development and still faces many challenges in material design, device preparation, and systematic application. Therefore, it is particularly necessary to summarize the research progress of related aspects to promote the development of this field (To achieve large‐scale applications, it is necessary to develop devices that can be applied on a large scale). In this review, the systematic construction methods of floating materials are reviewed from the aspects of lightweight carrier integration as well as functionalization and surface modification. Subsequently, the recent studies on floating solar materials and their devices are categorized and summarized. Their applications in the purification of polluted seawater, water splitting, CO2 reduction, and prevention of water bloom are reviewed in detail. Finally, the outlook for future development is critically discussed.

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Double layer PVDF blends PVDF‐HFP membrane with modified ZnO nanoparticles for direct contact membrane distillation (DCMD)

Radzi

Ahmad

2022

Asia-Pacific J Chem Eng

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In this work, the double layer (DL) polyvinylidene fluoride (PVDF) blends polyvinylidene hexafluoropropylene (PVDF-HFP) membrane is prepared via the double casting phase inversion (DCPI) method. The PVDF blended PVDF-HFP incorporation with ZnO nanoparticles is cast on the top layer of the membrane. The morphology of the fabricated membrane displays two layers of the membrane with different morphology, where the top layer is dense and no macrovoid form. Furthermore, the water contact angle increase due to the increment of perfluorinated polymer content in the top layer, which is 147 .Besides, the liquid entry pressure of water (LEPw) is 0.76 bar with average pore size of the top surface is 0.24 μm, while the bottom surface is 8 μm. The porosity of the DL PVDF blends PVDF-HFP membrane do not have significant changes compared to the single layer (SL) membrane, with 87%. A stable flux of 6.14 L/m 2 h was achieved over the 6 h of operation of direct contact membrane distillation (DCMD) lab-scale unit. The DL membrane removes almost 99% salt.

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Anti-wetting polyvinylidene fluoride membrane incorporated with hydrophobic polyethylene-functionalized-silica to improve CO2 removal in membrane gas absorption

Cited by 36 publications

References 56 publications

Functionalization of silica nanoparticles to reduce membrane swelling in CO₂ absorption process

Functionalization of silica nanoparticles to reduce membrane swelling in CO₂ absorption process

Floating Solar Materials and their Devices for Energy Conversion and Environment Remediation

Double layer PVDF blends PVDF‐HFP membrane with modified ZnO nanoparticles for direct contact membrane distillation (DCMD)

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Anti-wetting polyvinylidene fluoride membrane incorporated with hydrophobic polyethylene-functionalized-silica to improve CO2 removal in membrane gas absorption

Cited by 36 publications

References 56 publications

Functionalization of silica nanoparticles to reduce membrane swelling in CO2 absorption process

Functionalization of silica nanoparticles to reduce membrane swelling in CO2 absorption process

Floating Solar Materials and their Devices for Energy Conversion and Environment Remediation

Double layer PVDF blends PVDF‐HFP membrane with modified ZnO nanoparticles for direct contact membrane distillation (DCMD)

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Product

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Functionalization of silica nanoparticles to reduce membrane swelling in CO₂ absorption process

Functionalization of silica nanoparticles to reduce membrane swelling in CO₂ absorption process