Controlling the physical and electrochemical properties of block copolymer-based porous carbon fibers by pyrolysis temperature

Zhou, Zhengping; Liu, Tianyu; Khan, Assad U.

doi:10.1039/c9me00066f

Cited by 40 publications

(38 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 52 ] Specifically, N 2 ‐physisorption showed a high surface area of 780 m 2 g −1 . Based on nonlocal density functional theory (NLDFT), [ 43–45 ] the pore size distribution showed multiple peaks at ≈0.53, 0.86, and 1.30 nm in the micropore range and a unimodal peak at 13 nm in the mesopore range (Figure 2f).…”

Section: Resultsmentioning

confidence: 99%

“…First, the high surface area of the PCF allows for the high capacity and rapid saturation of surface adsorption sites. [ 45 ] Second, relating the Weber–Morris model and the Langmuir model, the experimental data indicates that mass transfer is not the rate‐limiting step and the high capacity is attributed to the interconnectivity of the hierarchical pores. Third, the surface of PCF is rather homogeneous for the dye adsorption.…”

Section: Resultsmentioning

confidence: 99%

“…Cumyl dithiobenzoate (CDB) was synthesized via a previously reported protocol. [ 42,43,45,76 ] Methyl orange (MO) and methylene blue (MB) dyes were purchased from VWR and Merck, respectively. Methanol was used for polymer precipitation.…”

Section: Methodsmentioning

confidence: 99%

“…Poly(methyl methacrylate)‐ block ‐poly(acrylonitrile) (PMMA‐ b ‐PAN) was synthesized via reversible addition–fragmentation chain transfer (RAFT) polymerization modified from a previous report. [ 43–45 ] First, MMA (35.0 mL, 309 mmol), CDB (84.3 mg, 0.309 mmol), and AIBN (25.4 mg, 0.155 mmol) were dissolved in benzene (51.6 mL) in a 100 mL Schlenk flask. The mixture was subjected to three cycles of freeze–pump–thaw (FPT) followed by back‐filling with N 2 to remove dissolved oxygen.…”

Section: Methodsmentioning

confidence: 99%

“…Herein, we employ our recently developed hierarchical porous carbon fibers (PCF) [ 42–45 ] with controlled porosity from block copolymers in electrosorptive wastewater treatment. The uniform mesopores, continuous carbon fiber matrices, and high surface areas of PCF offer high adsorption capacity and fast infiltration rates for both cationic and anionic dyes.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Capacitive Organic Dye Removal by Block Copolymer Based Porous Carbon Fibers

Serrano

Khan

et al. 2020

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

Block copolymer based porous carbon fibers (PCFs) have hierarchical pores, high surface areas, and excellent electrical/ion conductivities. Herein, PCF is synthesized from poly(methyl methacrylate)‐block‐poly(acrylonitrile) and utilized for organic dye removal. The PCF contains hierarchical macro‐, meso‐, and micropores with a surface area of 780 m2 g−1. The electrosorptive behavior of PCF is well described by the Langmuir isotherm and the Weber–Morris model. Based on the model, the interconnected hierarchical pores contribute to easy accessibility of dye ions to the inner surface sites within PCF, resulting in a high electrosorption capacity of 1360 mg g−1, reaching ≈87% of the theoretical maximum. The PCF shows a capacity loss of <0.5% over ten cycles during a 240 h operation period. Thanks to the hierarchical pores that allow for rapid ion desorption, the PCF can easily be regenerated. Lastly, depending on the electrode configuration, the PCF can selectively remove anionic dye, cationic dye, or both. The findings herein provide a fundamental understanding of electrosorptive behavior of block copolymer based porous carbon fibers, enabling future development in filtration applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Capacitive Organic Dye Removal by Block Copolymer Based Porous Carbon Fibers

Serrano

Khan

et al. 2020

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

show abstract

Oxidative stabilization of pitch‐polyacrylonitrile composite nanofibers electrospun by incorporating high‐percentage inexpensive pitch

Tang

Chen

Zuo

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polyacrylonitrile (PAN)‐based composite nanofibers incorporated with high‐percentage inexpensive pitch were successfully prepared by a simple electrospinning technique. Low‐softening‐point naphthalene pitch (NP) has the merit of high solubility but inevitably brings about preoxidation problem. Thus the influence of different preoxidation strategies on the morphology, composition, and structure of composite nanofibers was systematically investigated. The results show that there exists a ternary phase diagram consisting of PAN‐pitch‐solvent and a suitable apparent viscosity of homogeneous solution, which favors the smooth electrospinning and good adjustment for the diameter of carbon nanofibers (100–500 nm). The crystallinity, crystalline order, and electrical conduction of composite nanofibers are enhanced by incorporating graphitizable NP, for example, the electrical resistance of 50% NP‐PAN composite nanofiber films after 800°C carbonization decreases about 30%. Both increasing the oxidation temperature and extending the oxidation time are beneficial to the oxidative stabilization of composite nanofibers with a suitable NP percentage below 50%. Gradient heating (240–340°C) and pressurized (0.08 MPa) preoxidations could accelerate the oxidative stabilization of composite nanofibers with a high NP percentage up to 110% and significantly shorten the oxidation time by half. Therefore, this study paves the road for facile preparation of cost‐competitive carbon nanofibers with controllable morphology, structure, and properties.

show abstract

Facile Hydrogenation of Furfural by MOF‐Derived Graphitic Carbon Wrapped FeCo Bimetallic Catalysts

Shaikh

Ali

Abdelnaby

et al. 2023

Chemistry An Asian Journal

View full text Add to dashboard Cite

A catalytic system for selective transformation of furfural into biofuel is highly desirable. However, selective hydrogenation of the C=O group over the furan ring of furfural to produce ether in one step is challenging. Here, we report the preparation of a series of magnetically recoverable FeCo@GC nano‐alloys (37–40 nm). Fe3O4 (3–5 nm) and MOF‐71 (Co), used as the Co and C source, were mixed together in a range of Fe/Co ratios, and then encapsulated in a graphitic carbon (GC) shell to prepare such alloys. STEM‐HAADF shows the darker core made of FeCo and the shell of graphitic carbon. Furfural is hydrogenated to produce >99% isopropyl furfuryl ether in isopropanol with >99% conversion at 170 °C under 40 bars of H2, whereas n‐chain alcohol, such as ethanol, produces corresponding ethyl levulinate in 93%. The synergistic effect due to the charge transfer from Fe to Co leads to higher reactivity of FeCo@GC. The catalyst, which can be separated from the reaction medium using a simple magnet without significant damage to the surface or composition, retained its reactivity and selectivity for up to four consecutive cycles.

show abstract

Controlling the physical and electrochemical properties of block copolymer-based porous carbon fibers by pyrolysis temperature

Abstract: Pyrolysis temperature is an important processing parameter that determines the physical and electrochemical properties of block copolymer-based porous carbon fibers.

Cited by 40 publications

References 65 publications

Capacitive Organic Dye Removal by Block Copolymer Based Porous Carbon Fibers

Capacitive Organic Dye Removal by Block Copolymer Based Porous Carbon Fibers

Oxidative stabilization of pitch‐polyacrylonitrile composite nanofibers electrospun by incorporating high‐percentage inexpensive pitch

Facile Hydrogenation of Furfural by MOF‐Derived Graphitic Carbon Wrapped FeCo Bimetallic Catalysts

Contact Info

Product

Resources

About