Novel PTFE hollow fiber membrane fabricated by emulsion electrospinning and sintering for membrane distillation

Su, Chunlei; Li, Yuping; Cao, Hongbin; Lu, Chun; Li, Yujiao; Chang, Junjun; Duan, Feng

doi:10.1016/j.memsci.2019.04.037

Cited by 106 publications

(39 citation statements)

References 47 publications

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“…The molten PTFE NPs will become soft and fuse to stick together, forming a chain of PTFE NPs or, in other words, a PTFE nanofiber. However, in the sintering process, severe shrinkage occurred to the PTFE nanofiber as molten PTFE NPs would fuse with each other after removing the matrix of PEO [ 33 , 34 ]. On the other hand, the water-soluble PAI resin belongs to a series of high molecular polymers with regular and alternating arrangement of imide rings and amide bonds.…”

Section: Resultsmentioning

confidence: 99%

Preparation of PI/PTFE–PAI Composite Nanofiber Aerogels with Hierarchical Structure and High-Filtration Efficiency

Liu

Shen

et al. 2020

Nanomaterials

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Electrospun nanofiber, showing large specific area and high porosity, has attracted much attention across various fields, especially in the field of air filtration. The small diameter contributes to the construction of filters with high-filtration efficiency for fine particulate matter (PM), however, along with an increase in air resistance. Herein, composited nanofiber aerogels (NAs), a truly three-dimensional (3D) derivative of the densely compacted electrospun mat, were constructed with the blocks of polytetrafluoroethylene–polyamideimide (PTFE–PAI) composite nanofiber and polyimide (PI) nanofiber. PI/PTFE–PAI NAs with hierarchically porous architecture and excellent mechanical properties have been obtained by thermally induced crosslink bonding. Results indicated that sintering at 400 °C for 30 min could complete the decomposition of polyethylene (PEO) and imidization of polyamic acid (PAA) into PI, as well as generate sufficient mechanical bonding between adjacent nanofibers in the NAs without extra additive. The well-prepared PI/PTFE–PAI NAs could withstand high temperature up to 500 °C. In addition, the filtration tests illustrated that the composite NAs had an excellent performance in PM filtration. More importantly, the filtration behavior could be adjusted to meet the requirements of various applications. The excellent thermal stability and high-filtration efficiency indicated its great potential in the field of high-temperature air filtration.

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Section: Resultsmentioning

confidence: 99%

Preparation of PI/PTFE–PAI Composite Nanofiber Aerogels with Hierarchical Structure and High-Filtration Efficiency

Liu

Shen

et al. 2020

Nanomaterials

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“…33,34 It is generally accepted that the complete electron transfer (4e − ) is in favor of ORR; on the contrary, the two-electron pathway is undesirable because its final product is H 2 O 2 , 35,36 which will destroy the Nafion membrane and cause damage to fuel cells. 37 Theoretical studies reveal that four-electron pathway is preferred to occur on the Pt crystal facet with (111) under the condition of oxygen enrichment. 38 Thus, the elemental steps of ORR are usually presented in the following (*denotes an active site of catalyst) 39 :…”

Section: Fundamental Understanding Of Orr Mechanismmentioning

confidence: 99%

“…Due to the complex kinetics of ORR and complicated intermediates during the whole ORR process, it is a great challenge for us to understand the intrinsic ORR mechanism from the atomic or molecular level to design Pt‐based electrocatalysts 33,34 . It is generally accepted that the complete electron transfer (4 e − ) is in favor of ORR; on the contrary, the two‐electron pathway is undesirable because its final product is H 2 O 2 , 35,36 which will destroy the Nafion membrane and cause damage to fuel cells 37 . Theoretical studies reveal that four‐electron pathway is preferred to occur on the Pt crystal facet with (111) under the condition of oxygen enrichment 38 .…”

Section: Fundamental Understanding Of Orr Mechanismmentioning

confidence: 99%

A fundamental comprehension and recent progress in advanced Pt‐based ORR nanocatalysts

Wang

2021

SmartMat

152

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Today, Pt/C catalysts are widely used in proton exchange membrane fuel cells (PEMFCs). The practical applications of PEMFCs still face many limitations in the preparation of advanced Pt‐based catalysts, including high cost, limited life‐time, and insufficient power density. A kinetically sluggish oxygen reduction reaction (ORR) is primarily responsible for these issues. The development of advanced Pt‐based catalysts is crucial for solving these problems when the large‐scale application of PEMFCs is to be realized. Herein, we demonstrate the design principle of advanced Pt‐based catalysts with an emphasis on theoretical understandings to practical applications. Generally, three main strategies (including strain effect, electronic effect, and ensemble effect) that governing the initial activity of Pt‐based electrocatalysts are elaborated in detail in this review. Recent advanced Pt‐based ORR catalysts are summarized and we present representative achievements to further reveal the relationship of excellent ORR performance based on theoretical mechanisms. Then we focus on the preparation standards of membrane electrode assembles and testing protocols in practice. Finally, we predict the remaining challenges and present our perspectives with regards to design strategies for improving ORR performance of Pt‐based catalysts in the future.

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“…In a study of MD materials, Su, et al. (2019) fabricated a novel PTFE hollow fiber MD membrane by emulsion electrospinning and sintering. The membrane was fabricated by combining the advantages of both electrospun nanofibers and hollow fiber membrane.…”

Section: New Technology Advancesmentioning

confidence: 99%

Membrane processes

Arabi¹,

Pellegrin

Aguinaldo

et al. 2020

Water Environment Research

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This literature review provides a review for publications in 2018 and 2019 and includes information membrane processes findings for municipal and industrial applications. This review is a subsection of the annual Water Environment Federation literature review for Treatment Systems section. The following topics are covered in this literature review: industrial wastewater and membrane. Bioreactor (MBR) configuration, membrane fouling, design, reuse, nutrient removal, operation, anaerobic membrane systems, microconstituents removal, membrane technology advances, and modeling. Other subsections of the Treatment Systems section that might relate to this literature review include the following: Biological Fixed-Film Systems, Activated Sludge, and Other Aerobic Suspended Culture Processes, Anaerobic Processes, and Water Reclamation and Reuse. This publication might also have related information on membrane processes: Industrial Wastes, Hazardous Wastes, and Fate and Effects of Pollutants.

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Novel PTFE hollow fiber membrane fabricated by emulsion electrospinning and sintering for membrane distillation

Cited by 106 publications

References 47 publications

Preparation of PI/PTFE–PAI Composite Nanofiber Aerogels with Hierarchical Structure and High-Filtration Efficiency

Preparation of PI/PTFE–PAI Composite Nanofiber Aerogels with Hierarchical Structure and High-Filtration Efficiency

A fundamental comprehension and recent progress in advanced Pt‐based ORR nanocatalysts

Membrane processes

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