Hollow carbon fiber sponges from crude catkins: an ultralow cost absorbent for oils and organic solvents

Zang, Linlin; Bu, Zhipeng; Sun, Laijun; Zhang, Yanhong

doi:10.1039/c6ra08183e

Cited by 24 publications

(9 citation statements)

References 42 publications

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“…The oil mass removed from water has no significant decrease after eight cycles, indicating the outstanding recycle performance of OCA ( Figure 4I). Compared with the carbon material absorbent from catkins in literatures, OCA with similar absorption capacity for oil and organic solvents to HCFSs-9 not only dilevers superior recycle performance to HCFSs-9, but also can be obtained at lower pyrolysis temperature [79].…”

Section: Resultsmentioning

confidence: 99%

A versatile biomass derived carbon material for oxygen reduction reaction, supercapacitors and oil/water separation

et al. 2017

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Directly pyrolyzing biowastes has attracted intensive interest, probably because this economical and facile method provides an efficient and versatile platform for synthesizing functional carbons. This study describes the synthesis of different functional carbons from poplar catkins via different processes for multipurpose applications. Nitrogen and oxygen dual-doped carbon (NODC-800) derived from catkins delivers superior electrochemical characteristics as oxygen reduction reaction (ORR) catalyst in alkaline fuel cell to that of commercial Pt/C in terms of catalytic activity, stability, resistance to methanol cross-over and CO poisoning. In addition, NODC-800 exhibits a high capacity (~ 251 F g-1 at 0.5 A g-1) with nearly 100% retention rate after 1000 cycles as supercapacitors electrodes. An oleophylic carbon aerogel derived from catkins is proven to be superoleophilic and porous enough to "wet" with oils and organic liquids and repel water completely to achieve oil/water separation. This work is a successful case to take full advantage of raw materials from nature via multiple technologies to achieve energy sustainable development and protect environmental from oils and organic solvents spill.

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Section: Resultsmentioning

confidence: 99%

A versatile biomass derived carbon material for oxygen reduction reaction, supercapacitors and oil/water separation

et al. 2017

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“…14 Despite excellent properties of the above biomass-based carbon aerogels, their preparation required extremely harsh and sophisticated conditions. Thus, Bi 15 and Zang 16 et al fabricated carbon aerogels via single-step carbonization of raw cotton and willow catkin, respectively. Although the as-prepared carbon aerogels exhibit high absorbency for oils and organic solvents, they are seldom compressible and conductive.…”

Section: ■ Introductionmentioning

confidence: 99%

Pressure-Sensitive and Conductive Carbon Aerogels from Poplars Catkins for Selective Oil Absorption and Oil/Water Separation

Sun

et al. 2017

ACS Appl. Mater. Interfaces

178

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Multifunctional carbon aerogels that are both highly compressible and conductive have broad potential applications in the range of sound insulator, sensor, oil absorption, and electronics. However, the preparation of such carbon aerogels has been proven to be very challenging. Here, we report fabrication of pressure-sensitive and conductive (PSC) carbon aerogels by pyrolysis of cellulose aerogels composed of poplars catkin (PC) microfibers with a tubular structure. The wet PC gels can be dried directly in an oven without any deformation, in marked contrast to the brittle nature of traditional carbon aerogels. The resultant PSC aerogels exhibit ultralow density (4.3 mg cm), high compressibility (80%), high electrical conductivity (0.47 S cm), and high absorbency (80-161 g g) for oils and organic liquids. The PSC aerogels have potential applications in various fields such as elastomeric conductors, absorption of oils from water and oil/water separation, as the PSC aerogels feature simple preparation process with low-cost biomass as the precursor.

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“…The recyclability of absorption materials was also an important criterion for the practical pollution cleanup and environmental protection, because most of the pollutants were either precious raw materials or toxic. , Recycling process can provide absorption materials technical advantages, including saving energy cost and reducing generation of waste. Three common recycling means − (including absorption–squeezing, absorption–combustion, and absorption–distillation) can be tailored according to the characteristic of as-given organic solvents. Inspired by the highly repeatable compressibility of GCPCA, squeezing was an attractive method for low-viscosity or nonflammable organic solvents with high boiling point (such as n -dodecane, Figure a–d).…”

Section: Results and Discussionmentioning

confidence: 99%

Bioinspired Assembly of Carbon Nanotube into Graphene Aerogel with “Cabbagelike” Hierarchical Porous Structure for Highly Efficient Organic Pollutants Cleanup

Zhan

Gao

et al. 2017

ACS Appl. Mater. Interfaces

123

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Nowadays, physical absorption has become a feasible method offering an efficient and green route to remove organic pollutants from the industrial wastewater. Inspired by polydopamine (PDA) chemistry, one-dimensional PDA-functionalized multiwalled carbon nanotubes (MWCNT-PDA) were creatively introduced into graphene aerogel framework to synthesize a robust graphene/MWCNT-PDA composite aerogel (GCPCA). The whole forming process needed no additional reducing agents, significantly reducing the contamination emissions to the environment. The GCPCA exhibited outstanding repeatable compressibility, ultralight weight, as well as hydrophobic nature, which were crucial for highly efficient organic pollution absorption. The MWCNTs in moderate amounts can provide the composite aerogels with desirable structure stability and extra specific surface area. Meanwhile, the eventual absorption performance of GCPCAs can be improved by optimizing the microporous structure. In particular, a novel "cabbagelike" hierarchical porous structure was obtained as the prefreezing temperature was decreased to -80 °C. The miniaturization of pore size around the periphery of GCPCA enhanced the capillary flow in aerogel channels, and the super-absorption capacity for organic solvents was up to 501 times (chloroform) its own mass. Besides, the GCPCAs exhibited excellent reusable performance in absorption-squeezing, absorption-combustion, and absorption-distillation cycles according to the characteristic of different organic solvents. Because of the viable synthesis method, the resulting GCPCAs with unique performance possess broad and important application prospects, such as oil pollution cleanup and treatment of chemical industrial wastewater.

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Hollow carbon fiber sponges from crude catkins: an ultralow cost absorbent for oils and organic solvents

Abstract: Hollow carbon fiber sponges have been synthesized through the pyrolysis of bulk crude catkins which are ultralow-cost, hollow carbon fibers. The sponges exhibited a high sorption capacity for organic solvents and oils and excellent recyclability.

Cited by 24 publications

References 42 publications

A versatile biomass derived carbon material for oxygen reduction reaction, supercapacitors and oil/water separation

A versatile biomass derived carbon material for oxygen reduction reaction, supercapacitors and oil/water separation

Pressure-Sensitive and Conductive Carbon Aerogels from Poplars Catkins for Selective Oil Absorption and Oil/Water Separation

Bioinspired Assembly of Carbon Nanotube into Graphene Aerogel with “Cabbagelike” Hierarchical Porous Structure for Highly Efficient Organic Pollutants Cleanup

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