Activated Carbon Nanofiber Nonwovens: Improving Strength and Surface Area by Tuning Fabrication Procedure

Waisi, Basma I.; Manickam, Seetha S; Benes, Nieck E.; Nijmeijer, Arian; McCutcheon, Jeffrey R.

doi:10.1021/acs.iecr.8b05612

Cited by 30 publications

(28 citation statements)

References 38 publications

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“…The average fiber diameter increased with increasing polymer concentration in the precursor solution. (16,17) Xiong et al (18) prepared polyacrylonitrile (PAN) nanofibers activated at a relatively low activation temperature (500 °C), with a high N content of 20.9 wt.% and a CO 2 uptake of 2.25 mmol/g at 1 bar. The pores mainly developed during carbonization and activation, and the surface chemistry was also strongly related to the conditions used for carbonization and activation.…”

Section: Introductionmentioning

confidence: 99%

Importance of Pore Structure and Surface Chemistry in Carbon Dioxide Adsorption on Electrospun Carbon Nanofibers

Chiang¹,

Lee²,

Leo³

et al. 2020

Sensors and Materials

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The development of carbon dioxide (CO 2) capture technology is of great urgency for reducing the emission of CO 2 to the atmosphere and mitigating global warming. Polyacrylonitrilebased electrospun carbon nanofibers were prepared in this study at different carbonization temperatures for CO 2 capture. The effects of the primary surface features and the functional groups of the carbon nanofibers on CO 2 adsorption capacity were discussed. Results showed that the carbonization temperature influenced the porous texture and the surface chemical states of the carbon nanofibers significantly. The specific surface area, total pore volume, and micropore volume of the fibers increased with increasing carbonization temperature, but the ultra-micropore volume presented a different trend. The samples carbonized at 750 °C had the smallest average pore hydraulic radius. Moreover, in the micropore range, the volume of sub-micropores increased at a greater rate than that of ultra-micropores after activation. The carbonization temperature was also of great importance in controlling the nitrogen content and composition. A CO 2 uptake of 3.47 mmol/g at 25 °C and 1 atm was achieved. The ultramicropore volume of the carbon nanofibers was the most important parameter for determining CO 2 uptake at 1 atm; however, the CO 2 adsorption capacity at 0.15 atm was highly dependent on the surface pyrrolic or pyridonic groups.

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Section: Introductionmentioning

confidence: 99%

Importance of Pore Structure and Surface Chemistry in Carbon Dioxide Adsorption on Electrospun Carbon Nanofibers

Chiang¹,

Lee²,

Leo³

et al. 2020

Sensors and Materials

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“…In recent years, a great deal of research has focused on the manufacturing of PVDF nanofibers for the different applications in membrane science (7). Electrospinning technique is typically used to produce nanofibers which have the benefits of high porosity and ease of preparation (8).…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Nanofibers Membranes using Electrospinning Technology for Oil Removal

2021

BSJ

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Oily wastewater is one of the most challenging streams to deal with especially if the oil exists in emulsified form. In this study, electrospinning method was used to prepare nanofiberous polyvinylidene fluoride (PVDF) membranes and study their performance in oil removal. Graphene particles were embedded in the electrospun PVDF membrane to enhance the efficiency of the membranes. The prepared membranes were characterized using a scanning electron microscopy (SEM) to verify the graphene stabilization on the surface of the membrane homogeneously; while FTIR was used to detect the functional groups on the membrane surface. The membrane wettability was assessed by measuring the contact angle. The PVDF and PVDF / Graphene membranes efficiency was tested in separation of emulsified oil from aqueous solutions. The results showed that PVDF-Graphene nanofiber membrane exhibited better performance than the plain PVDF nanofiber membrane with average water flux of 210 and 180 L.m -2 .h -1 , respectively. Both membranes showed high oil rejection with more than 98%.

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“…Here, we adopted an emerging technology, electrospinning, to make the support layer. Electrospinning has some advantages over the traditional phase inversion technique that include producing highly porous layer and generating sub-micron fibers with highly controllable properties (Waisi et al, 2019). These properties have led to introduce these nanofiber sheets as promising alternatives for the conventional FO membrane support layers.…”

Section: Introductionmentioning

confidence: 99%

Preparation of TFC Membranes Supported with Elelctrospun Nanofibers for Desalination by Forward Osmosis

Al-Furaiji

Kadhom

Kalash

et al. 2020

Preprint

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Abstract. Forward osmosis (FO) process has been considered as a viable option for water desalination in comparison to the traditional processes like reverse osmosis regarding the energy consumption and economical operation. In this work, polyacrylonitrile (PAN) nanofiber support layer was prepared using electrospinning process as a modern method. Then, an interfacial polymerization reaction between m-phenylenediamine (MPD) and trimesoyl chloride (TMC) was carried out to generate a polyamide selective thin film composite (TFC) membrane on the support layer. The TFC membrane was tested in FO mode (feed solution facing the active layer) using standard methodology and compared to a commercially available cellulose triacetate membrane (CTA). The synthesized membrane showed a high performance in terms of water flux (16&#8201;L&#8201;m&#8722;2&#8201;h&#8722;1) but traded the salt rejection (4&#8201;g&#8201;m&#8722;2&#8201;h&#8722;1) comparing with the commercially CTA membrane (water flux&#8201;=&#8201;13&#8201;L&#8201;m&#8722;2&#8201;h&#8722;1 and salt rejection&#8201;=&#8201;3&#8201;g&#8201;m&#8722;2&#8201;h&#8722;1) at no applied pressure and room temperature. Scanning electron microscopy (SEM), contact angle, mechanical properties, porosity, and performance characterizations were conducted to examine the membrane.

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Activated Carbon Nanofiber Nonwovens: Improving Strength and Surface Area by Tuning Fabrication Procedure

Cited by 30 publications

References 38 publications

Importance of Pore Structure and Surface Chemistry in Carbon Dioxide Adsorption on Electrospun Carbon Nanofibers

Importance of Pore Structure and Surface Chemistry in Carbon Dioxide Adsorption on Electrospun Carbon Nanofibers

Fabrication and Characterization of Nanofibers Membranes using Electrospinning Technology for Oil Removal

Preparation of TFC Membranes Supported with Elelctrospun Nanofibers for Desalination by Forward Osmosis

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